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| 1 | Comprehensive Transcriptome Analysis of Auxin Responses in Arabidopsis显示文摘在植物,荷尔蒙植物生长素塑造基因表示调整生长和开发。尽管有植物生长素可诱导的基因的详细描述,调整植物生长素的基因表示的时间、空间的动力学的全面概述正在缺乏。这里,我们从介绍实验的许多公开可得到的 Arabidopsis 分析 transcriptome 数据并且响应植物生长素集中和暴露时间并且在与另外的植物生长管理者的关系估计织物特定的基因表示。我们的分析证明对在大量植物生长素申请条件上并且在特定的纸巾的植物生长素的主要反应几乎只包括基因的起来规定并且识别最柔韧的植物生长素标记基因。织物特定的植物生长素回答与 Aux/IAA 基因和基因表示的上下文特定、顺序特定的模式的随后的规定的微分表示相关。在抄本层次的变化与变化形式,增加的运输能力和在高细胞的植物生长素集中的节制的生合成的下面规定的一个不同序列一致。我们植物生长素调整的数据表演与生合成,分解代谢和另外的植物激素的发信号的小径联系的基因。我们在场植物生长素反应的 transcriptional 概述。在植物生长素和另外的植物激素之间的特定的相互作用被加亮,特别地他们的新陈代谢的规定。我们的分析为支撑的植物生长素依赖者进程提供一张路线图植物生长素 codea 的概念开始特定的发展进程的基因表示的织物特定的指纹。 | Ivan A. Paponov Martina Paponovt William Teale Margit Menges Sohini Chakrabortee James A.H. Murray Klaus Palme | 2008 | Molecular Plant2008，1，2： | 17 |
| 2 | Mantle heterogeneity,plume-lithosphere interaction at rift controlled ocean-continent transition zone:Evidence from trace-PGE geochemistry of Vempalle flows,Cuddapah Basin,India显示文摘This study reports major, trace, rare earth and platinum group element compositions of lava flows from the Vempalle Formation of Cuddapah Basin through an integrated petrological and geochemical approach to address mantle conditions, magma generation processes and tectonic regimes involved in their formation. Six flows have been identified on the basis of morphological features and systematic three-tier arrangement of vesicular-entablature-colonnade zones. Petrographically, the studied flows are porphyritic basalts with plagioclase and clinopyroxene representing dominant phenocrystal phases.Major and trace element characteristics reflect moderate magmatic differentiation and fractional crystallization of tholeiitic magmas. Chondrite-normalized REE patterns corroborate pronounced LREE/HREE fractionation with LREE enrichment over MREE and HREE. Primitive mantle normalized trace element abundances are marked by LILE-LREE enrichment with relative HFSE depletion collectively conforming to intraplate magmatism with contributions from sub-continental lithospheric mantle(SCLM) and extensive melt-crust interaction. PGE compositions of Vempalle lavas attest to early sulphur-saturated nature of magmas with pronounced sulphide fractionation, while PPGE enrichment over IPGE and higher Pd/Ir ratios accord to the role of a metasomatized lithospheric mantle in the genesis of the lava flows. HFSEREE-PGE systematics invoke heterogeneous mantle sources comprising depleted asthenospheric MORB type components combined with plume type melts. HFSE-REE variations account for polybaric melting at variable depths ranging from garnet to spinel lherzolite compositional domains of mantle. Intraplate tectonic setting for the Vempalle flows with P-MORB affinity is further substantiated by(i) their origin from a rising mantle plume trapping depleted asthenospheric MORB mantle during ascent,(ii) interaction between plume-derived melts and SCLM,(iii) their rift-controlled intrabasinal emplacement through Archeane Proterozoic cratonic blocks in a subduction-unrelated ocean-continent transition zone(OCTZ). The present study is significant in light of the evolution of Cuddapah basin in the global tectonic framework in terms of its association with Antarctica, plume incubation, lithospheric melting and thinning, asthenospheric infiltration collectively affecting the rifted margin of eastern Dharwar Craton and serving as precursors to supercontinent disintegration. | Th.Dhanakumar Singh C.Manikyamba K.S.V.Subramanyam Sohini Ganguly Arubam C.Khelen N.Ramakrishna Reddy | 2018 | Geoscience Frontiers2018，9，6： | 6 |
| 3 | Geochemical cycling during subduction initiation:Evidence from serpentinized mantle wedge peridotite in the south Andaman ophiolite suite显示文摘The ophiolite suite from south Andaman Islands forms part of the Tethyan Ophiolite Belt and preserves the remnants of an ideal ophiolite sequence comprising a basal serpentinized and tectonised mantle peridotite followed by ultramafic and mafic cumulate units, basaltic dykes and spilitic pillow basalts interlayered with arkosic wacke. Here, we present new major, trace, rare earth(REE) and platinum group(PGE) element data for serpentinized and metasomatized peridotites(dunites) exposed in south Andaman representing the tectonized mantle section of the ophiolite suite. Geochemical features of the studied rocks, marked by Al_2 O_3/TiO_2 > 23, LILE-LREE enrichment, HFSE depletion, and U-shaped chondrite-normalized REE patterns with(La/Sm)N > 1 and(Gd/Yb)N <1, suggest contributions from boninitic mantle melts. These observations substantiate a subduction initiation process ensued by rapid slab roll-back with extension and seafloor spreading in an intraoceanic fore-arc regime. The boninitic composition of the serpentinized peridotites corroborate fluid and melt interaction with mantle manifested in terms of(i) hydration, metasomatism and serpentinization of depleted, MORB-type, sub-arc wedge mantle residual after repeated melt extraction; and(ii) refertilization of refractory mantle peridotite by boninitic melts derived at the initial stage of intraoceanic subduction. Serpentinized and metasomatized mantle dunites in this study record both MOR and intraoceanic arc signatures collectively suggesting suprasubduction zone affinity. The elevated abundances of Pd(4.4-12.2 ppb) with highΣPPGE/∑IPGE(2-3) and Pd/Ir(2-5.5) ratios are in accordance with extensive melt-rock interaction through percolation of boninitic melts enriched in fluid-fluxed LILE-LREE into the depleted mantle after multiple episodes of melt extraction. The high Pd contents with relatively lower Ir concentrations of the samples are analogous to characteristic PGE signatures of boninitic magmas and might have resulted by the infiltration of boninitic melts into the depleted and residual mantle wedge peridotite during fore-arc extension at the initial stage of intraoceanic subduction. The PGE patterns with high Os + Ir(2-8.6 ppb)and Ru(2.8-8.4 ppb) also suggest mantle rejuvenation by infiltration of melts derived by high degree of mantle melting. The trace, REE and PGE data presented in our study collectively reflect heterogeneous mantle compositions and provide insights into ocean-crust-mantle interaction and associated geochemical cycling within a suprasubduction zone regime. | Abhishek Saha M.Santosh Sohini Ganguly C.Manikyamba Jyotisankar Ray Jagadish Dutta | 2018 | Geoscience Frontiers2018，9，6： | 4 |
| 4 | Geochemistry and petrogenesis of Rajahmundry trap basalts of Krishna-Godavari Basin,India显示文摘The Rajahmundry Trap Basalts(RTB) are erupted through fault-controlled fissures in the Krishna-Godavari Basin(K-G Basin) of Godavari Triple Junction,occurring as a unique outcrop sandwiched between Cretaceous and Tertiary sediments along the east coast of India.Detailed geochemical studies have revealed that RTB are mid-Ti(1.74-1.92) to high-Ti(2.04-2.81) basalts with a distinct quartz tholeiitic parentage.MgO(6.2-13.12 wt.%),Mg~#(29-50) and Zr(109-202 ppm) suggest that these basalts evolved by fractional crystallization during the ascent of the parent magma along deep-seated fractures.Moderate to high fractionation of HREE,as indicated by(Gd/Yb)N ratios(1.71-2.31) of RTB,suggest their generation through 3-5%melting of a Fe-rich mantle corresponding to the stability fields of spinel and garnet peridotite at depths of 60-100 km.Low K_2O/P_2O_5(0.26-1.26),high TiO_2/P_2O_5(6.74-16.79),La/Nb(0.89-1.45),Nb/Th > 8(8.35-13),negative anomalies at Rb reflect minimum contamination by granitic continental crust.(Nb/La)_(PM) ratios(0.66-1.1) of RTB are attributed to endogenic contamination resulted through recycling of subducted oceanic slab into the mantle.Pronounced Ba enrichment with relative depletion in Rb indicates assimilation of Infra- and Inter-trappean sediments of estuarine to shallow marine character.Geochemical compositions such as Al_2O_3/TiO_2(3.88-6.83),medium to high TiO_2(1.74-2.81 wt.%).positive Nb anomalies and LREE enrichment of these RTB attest to their mantle plume origin and indicate the generation of parent magma from a plume-related enriched mantle source with EM 1signature.Ba/Th(46-247),Ba/La(3.96-28.51) and Th/Nb(0.08-0.13) ratios suggest that the source enrichment process was marked by recycling of subduction-processed oceanic crust and lithospheric components into the mantle.Zr/Hf(37-41) and Zr/Ba(0.51-3.24) indicate involvement of an asthenospheric mantle source.The Rajahmundry basalts show affinity towards FOZO(focal zone mantle) and PSCL(post-Archaean subcontinental lithosphere) which reflect mixing between asthenospheric and lithospheric mantle components in their source.Origin of RTB magma is attributed to plume-lithosphere interaction and the upward movement of melt is facilitated by intrabasinal deep-seated faults in the K-G Basin. | C.Manikyamba Sohini Ganguly M.Santosh Abhishek Saha G.Lakshminarayana | 2015 | Geoscience Frontiers2015，6，3： | 1 |
| 5 | Reported Willingness and Associated Factors Related to Utilization of Voluntary Counseling and Testing Services by Female Sex Workers in Shandong Province,China显示文摘Objective To explore reported willingness and factors associated with utilization of voluntary counseling and testing services by female sex workers (FSWs) in China and to offer recommendations to optimize use of such services.Methods A questionnaire to explore willingness to use VCT was designed based on social ecological theory and formative qualitative research.A cross-sectional survey was conducted among FSWs from entertainment venues.Single and multiple logistic regression analyses were employed to examine factors associated with reported willingness to utilize VCT.Results A total of 970 FSWs provided valid questionnaires,with 69% (669) expressing willingness to utilize VCT.Factors at the interpersonal level associated with reported willingness included knowledge about VCT,desire to get help if diagnosed as HIV positive,ability to imagine life after an HIV positive diagnosis,and perceived support for VCT from peers,managers,and family members.Availability of free antiretroviral (ARV) treatment represented a factor at policy level.Other factors included intention to leave sex work in the near future,having had a previous HIV test,and lack of a suspected STD history.Conclusions The rate of reported willingness to use VCT among FSWs was substantially higher than that of actual VCT utilization (11%).The next step is to explore the connection between reported willingness and actual use.Based on these findings,peer education,VCT knowledge dissemination,and free ARV treatment should be emphasized to increase FSWs' willingness to use VCT. | YING WANG JING-BIN PAN XIAO-FENG WANG BING LI GAlL HENDERSON CATHERINE BOLAND EMRICK SOHINI SENGUPTA MYRON COHEN | 2010 | Biomedical and Environmental Sciences2010，23，6： | 1 |
| 6 | Tumor-and osteoclast-derived NRP2 in prostate cancer bone metastases显示文摘Understanding the role of neuropilin 2(NRP2)in prostate cancer cells as well as in the bone microenvironment is pivotal in the development of an effective targeted therapy for the treatment of prostate cancer bone metastasis.We observed a significant upregulation of NRP2 in prostate cancer cells metastasized to bone.Here,we report that targeting NRP2 in cancer cells can enhance taxane-based chemotherapy with a better therapeutic outcome in bone metastasis,implicating NRP2 as a promising therapeutic target.Since,osteoclasts present in the tumor microenvironment express NRP2,we have investigated the potential effect of targeting NRP2 in osteoclasts.Our results revealed NRP2 negatively regulates osteoclast differentiation and function in the presence of prostate cancer cells that promotes mixed bone lesions.Our study further delineated the molecular mechanisms by which NRP2 regulates osteoclast function.Interestingly,depletion of NRP2 in osteoclasts in vivo showed a decrease in the overall prostate tumor burden in the bone.These results therefore indicate that targeting NRP2 in prostate cancer cells as well as in the osteoclastic compartment can be beneficial in the treatment of prostate cancer bone metastasis. | Navatha Shree Polavaram Samikshan Dutta Ridwan Islam Arup K.Bag Sohini Roy David Poitz Jeffrey Karnes Lorenz C.Hofbauer Manish Kohli Brian A.Costello Raffael Jimenez Surinder K.Batra Benjamin A.Teply Michael H.Muders Kaustubh Datta | 2021 | Bone Research2021，9，2： | 1 |
| 7 | Adaptive Feedback Active Noise Control Headset:Implementation,Evaluation and Its Extensions显示文摘 | Gan Woon-Seng Mitra Sohini Kuo Sen M | 2005 | IEEE Transactions on Consumer Electronics2005，51，3： | 1 |
| 8 | Xytooli- gosaccharides as prebiotics from agricultural by - products: Production and applications 显示文摘 | Samanta A K Natasha Jayapal Jayaram Sohini Roy C | 2015 | Bioactive Carbohydrates and Dietary Fibre2015，5，1： | 1 |
| 9 | Recombinant flagellin and its cross-talk with lipopolysaccharide – effect on pooled chicken peripheral blood mononuclear cells显示文摘 | Shishir Kumar Gupta Rajib Deb Satish Gaikwad R. Saravanan C. Madhan Mohan Sohini Dey | 2013 | Research in Veterinary Science2013，，： | 1 |
| 10 | Microencapsulation of probiotic bacteria and its potential application in food technology显示文摘 | Arpit D Sohini R Utpal R | 2014 | Int J AgricBiol2014，7，1： | 1 |
| 11 | Geochemical Features of Bellara Trap Volcanic Rocks of Chitradurga Greenstone Belt, Western Dharwar Craton, India: Insights into MORB-BABB Association from a Neoarchean Back-Arc Basin显示文摘This study presents a comprehensive account of the petrogenetic and geodynamic evolution of the Bellara Trap volcanic rocks from the Ingaldhal Formation, Chitradurga Group, western Dharwar Craton(WDC). Geochemical attributes of these rocks are consistent with two groups with distinct evolutionary trends: one comprising tholeiitic, MORB(mid-ocean ridge basalt) type basalts(BTB) and the other corresponding to calc-alkaline andesites(BTA). Basalts are essentially composed of clinopyroxene and plagioclase whereas the andesites are porphyritic with phenocrysts of plagioclase, clinopyroxene and polycrystalline quartz embedded in a groundmass of K-feldspar, quartz and opaques. Primary igneous mineralogy is overprinted by greenschist facies metamorphism resulting in chlorite-actinolite-plagioclase assemblage. The BTB samples reflect nearly flat REE patterns with weak LREE enrichment in contrast to pronounced LREE enhancement over HREE discernible for BTA. Tectonically, the BTB samples correspond to an active mid-oceanic ridge-rift setting with a MORB composition, whereas a back-arc basin(BAB) regime is corroborated for the BTA samples fractionating from back-arc basin basalts. Geochemical imprints of subduction input are more pronounced in BTA compared to BTB as mirrored by their elevated abundances of incompatible fluid mobile elements like Ba, Th, U and LREE. The BTB is endowed with an N-to E-MORB signature attributable to minor contributions from subduction-related components at the inception of a back-arc basin in the vicinity of an active subduction system. The BTA derived through differentiation of a basaltic magma with BABB(back-arc basin basalt) affinity compositionally akin to a heterogeneous source mantle carrying depleted MORB-type and enriched arc-type components inducted with progressive subduction. The BABB-type andesites and MORB-type basalts from Bellara Traps record a compositional heterogeneity of mantle in an intraoceanic arc-back arc system. Mantle processes invoke a BABB-MORB spectrum with a MORB-like endmember and an arc-like endmember associated with a juvenile back-arc basin. This study infers a Neoarchean analogue of Mariana-type back-arc rift setting proximal to the arc with a gradual transition from anhydrous to hydrous melting processes synchronized with MORB-mantle and arc-mantle interaction during initiation of a nascent back arc adjacent to the arc. The MORB-BABB compositional spectrum for the Bellara Traps conforms to a Neoarchean back-arc basin that evolved under an extensional tectonic regime associated with incipient stages of back-arc rifting and incorporation of subduction-derived components in the mantle output. This study complies with Neoarchean intraoceanic accretionary cycle plate tectonics in WDC. | Chakravadhanula Manikyamba Sohini Ganguly Arijit Pahari | 2021 | Journal of Earth Science2021，32，6： | 0 |
| 12 | 内源性CD34+脂肪干细胞在提高人类脂肪移植效果持久性中的优势:一项异种移植模型显示文摘背景与目的脂肪移植是一项很有前景的软组织填充增大技术,但移植疗效持久性存在高度不可预知性,而且影响移植成活率的因素尚未明确。因为具有分化的潜能和释放生长因子的能力,脂肪来源干细胞(adipose-derivedstemcells,ADSCs)可在移植修复过程中起关键作用。我们旨在确定ADSCs在人体脂肪中呈现的生物学特性是否与移植体积的体内效果保持存在关联。方法利用标准的离心分离技术对从8例人体受术者获取的脂肪抽吸物进行处理,然后将其注射至6周龄无胸腺裸鼠躯体两侧。测量移植物的质量和体积,于移植后8周进行包含针对血管的CD31^+染色的组织学评估。从各供体脂肪抽吸物中分离获取基质血管细胞群(stromalvascularfraction,SVF),利用多参数流式细胞术对其表面标记物进行分析,并对其增值、分化能力和正常含氧量/低含氧量血管内皮细胞生长因子(vas—cularendothelialgrcwlhfactor,VEGF)的分泌情况进行实验研究。结果从不同供体中获取的SVF,其CD34^+祖细胞含量百分率存在较大差异,其平均值为21.3%±15.O%(X±s)。SVF细胞的增殖速率和成脂潜能在不同供体间存在较为中等差异。在小鼠异种移植研究中,移植后8周体积保存的量约为36%~68%,总体平均值为52%±11%。SVF中CD34^+祖细胞的含量与脂肪移植效果持久性方面存在较强的关联(P〈0.05)。结论在不同患者之间,其脂肪组织的内在生物学特性存在差异。特别是SVF中CD34^+祖细胞的浓度可能是影响脂肪移植持久性的因素之一。 | Brian J. Philips Tara L. Grahovac Jolene E. Valentin Christopher W. Chung Jacqueline M. Bliley Melanie E. Pfeifer Sohini B. Roy Stephanie Dreifuss Arta Kelmendi-Doko Russell E. Kling SudheerK. Ravuri Kacey G. Marra Vera S. Donnenberg Albert D. Donnenberg J. Peter Rubin 魏峰 高景恒 张晨 | 2014 | 中国美容整形外科杂志2014，25，4： | 0 |
| 13 | A deeper understanding of the gut microbiota of different human races in search of disease specific microbial and metabolic biomarkers显示文摘Objective:Resident microorganisms live in dynamic harmony with their hosts to influence various physical and psychological health aspects.The majority of the resident microbes are found in the digestive tract,aka the gut of mammals.If and when perturbed,the composition of gut microbiota could jeopardize the physiological balance or homeostasis.In this article,we aim to establish how different diseases could be accompanied by notable changes in gut microbial composition and lend insight into microbial regulation of health.Methods:Literature search was done in PubMed using relevant keywords and summarized in tabular form as well as in narration.Results:We try to focus on the concept of microbial and metabolite biomarkers for diseases.We also try to capture the renewed perspective of good and harmful microorganisms in the context of host health.We have presented a comparative network analysis of microbial roles in select diseases.Recent findings also suggested that the growth of some traditionally disease-causing pathogenic microorganisms promotes health in other human communities.We have listed major taxa of gut microbes in communities worldwide,which signifies that gut microbiota can be healthy or harmful depending on the urbanization and ethnicity of the hosts.The traditional and current schools of thoughts are both limited by the technology of metagenomic studies;we have elucidated some of their shortcomings.Conclusion:Research in the field of gut microbiota must take into account the different populations and the changing narrative of healthy and harmful microbes. | Sohini Mukhopadhyay Tanya Pattnaik Palok Aich | 2022 | Microenvironment & Microecology Research2022，4，4： | 0 |
| 14 | Greenstone belts and their mineral endowment:Preface显示文摘The granite-greenstone terranes nested in Archean cratonic nuclei of continents over the world are composed of variably metamorphosed igneous and sedimentary remnants of ancient ocean basins.These rocks preserve distinct geological and geochemical imprints of mantle evolution and differentiation of primordial crust。 | Sohini Ganguly Qiong-Yan Yang | 2018 | Geoscience Frontiers2018，9，3： | 0 |
| 15 | Extensional collapse of the Gondwana orogen: Evidence from Cambrian mafic magmatism in the Trivandrum Block, southern India显示文摘The assembly of Late Neoproterozoice Cambrian supercontinent Gondwana involved prolonged subduction and accretion generating arc magmatic and accretionary complexes, culminating in collision and formation of high grade metamorphic orogens. Here we report evidence for mafic magmatism associated with post-collisional extension from a suite of gabbroic rocks in the Trivandrum Block of southern Indian Gondwana fragment. Our petrological and geochemical data on these gabbroic suite show that they are analogous to high Fe tholeiitic basalts with evolution of the parental melts dominantly controlled by fractional crystallization. They display enrichment of LILE and LREE and depletion of HFSE with negative anomalies at Zre Hf and Ti corresponding to subduction zone magmatic regime. The tectonic affinity of the gabbros coupled with their geochemical features endorse a heterogeneous mantle source with collective melt contributions from sub-slab asthenospheric mantle upwelling through slab break-off and arc-related metasomatized mantle wedge, with magma emplacement in subduction to post-collisional intraplate settings. The high Nb contents and positive Nbe Ta anomalies of the rocks are attributed to inflow of asthenospheric melts containing ancient recycled subducted slab components and/or fusion of subducted slab materials owing to upwelling of hot asthenosphere. Zircon grains from the gabbros show magmatic crystallization texture with low U and Pb content. The LA-ICPMS analyses show ^(206) Pb/^(238) U mean ages in the range of 507-494 Ma suggesting Cambrian mafic magmatism. The post-collisional mafic magmatism identified in our study provides new insights into mantle dynamics during the waning stage of the birth of a supercontinent. | Qiong-Yan Yang Sohini Ganguly E.Shaji Yunpeng Dong V.Nanda-Kumar | 2019 | Geoscience Frontiers2019，10，1： | 0 |
| 16 | Phanerozoic magmatism in the Proterozoic Cuddapah Basin and its connection with the Pangean supercontinent显示文摘Magmatic pulses in intraplate sedimentary basins are windows to understand the tectonomagmatic evolution and paleaoposition of the Basin.The present study reports the U-Pb zircon ages of mafic flows from the Cuddapah Basin and link these magmatic events with the Pangean evolution during late Carboniferous-Triassic/Phanerozoic timeframe.Zircon U-Pb geochronology for the basaltic lava flows from Vempalle Formation,Cuddapah Basin suggests two distinct Phanerozoic magmatic events coinciding with the amalgamation and dispersal stages of Pangea at 300 Ma(Late Carboniferous)and 227 Ma(Triassic).Further,these flows are characterized by analogous geochemical and geochronological signatures with Phanerozoic counterparts from Siberian,Panjal Traps,Emeishan and Tarim LIPs possibly suggesting their coeval and cogenetic nature.During the Phanerozoic Eon,the Indian subcontinent including the Cuddapah Basin was juxtaposed with the Pangean LIPs which led to the emplacement of these pulses of magmatism in the Basin coinciding with the assemblage of Pangea and its subsequent breakup between 400 Ma and 200 Ma. | Th.Dhanakumar Singh C.Manikyamba Li Tang Sohini Ganguly M.Santosh K.S.V.Subramanyam Arubam C.Khelen | 2019 | Geoscience Frontiers2019，10，6： | 0 |
| 17 | Tectono-magmatic evolution of Tethyan oceanic lithosphere in supra subduction zone fore arc regime:Geochemical fingerprints from crust-mantle sections of Naga Hills Ophiolite显示文摘The Naga Hills Ophiolite(NHO)belt in the Indo-Myanmar range(IMR)represents a segment of Tethyan oceanic crust and upper mantle that was involved in an eastward convergence and collision of the Indian Plate with the Burmese Plate during the Late Cretaceous-Eocene.Here,we present a detailed petrological and geochemical account for the mantle and crustal sections of NHO,northeastern India to address(i)the mantle processes and tectonic regimes involved in their genesis and(ii)their coherence in terms of the thermo-tectonic evolution of Tethyan oceanic crust and upper mantle.The NHO suite comprises well preserved crustal and mantle sections discretely exposed at Moki,Ziphu,Molen,Washelo and Lacham areas.The ultramafic-mafic lithologies of NHO are mineralogically composed of variable proportions of olivine,orthopyroxene,clinopyroxene and plagioclase.The primary igneous textures for the mantle peridotites have been overprinted by extensive serpentinisation whereas the crustal section rocks reflect crystal cumulation in a magma chamber.Chondrite normalised REE profiles for the cumulate peridotite-olivine gabbro-gabbro assemblage constituting the crustal section of NHO show flat to depleted LREE patterns consistent with their generation from depleted MORB-type precursor melt in an extensional tectonic setting,while the mantle peridotites depict U-shaped REE patterns marked by relative enrichment of LREE and HREE over MREE.These features collectively imply a dual role of depleted MORB-type and enriched arc-type mantle components for their genesis with imprints of melt-rock and fluid-rock interactions.Tectonically,studied lithologies from NHO correspond to a boninitic to slab-proximal Island Arc Tholeiite affinity thereby conforming to an intraoceanic supra subduction zone(SSZ)fore-arc regime coherent with the subduction initiation process.The geochemical attributes for the crustal and mantle sections of NHO as mirrored by Zr/Hf,Zr/Sm,Nb/Ta,Zr/Nb,Nb/U,Ba/Nb,Ba/Th,Ba/La and Nd/Hf ratios propound a two-stage petrogenetic process:(i)a depleted fore arc basalt(FAB)type tholeiitic melt parental to the crustal lithologies was extracted from the upwelling asthenospheric mantle at SSZ fore-arc extensional regime thereby rendering a refractory residual upper mantle;(ii)the crust and upper mantle of the SSZ fore arc were progressively refertilised by boninitic melts generated in response to subduction initiation and slab-dehydration.The vestiges of Tethyan oceanic lithosphere preserved in NHO represent an accreted intra-oceanic fore arc crust and upper mantle section which records a transitional geodynamic evolution in a SSZ regime marked by subduction initiation,fore arc extension and arc-continent accretion. | Anisha Verencar Abhishek Saha Sohini Ganguly Manikyamba C. | 2021 | Geoscience Frontiers2021，12，3： | 0 |
| 18 | Lithological and tectonic response on catchment characteristics of Rishi Khola, Sikkim, India显示文摘Rishi Khola,a sub-watershed of Teesta river,traverses along the Main Central Thrust(MCT)with a multitude of litho units and structural entities.This study examines the impact of tectonic and lithologic controls in configuring the catchment characteristics of Rishi Khola,Sikkim,India.Corrected SRTM 30m DEM and Landsat 8 satellite image have been used for extracting the river network,preparing the sub-catchments,the longitudinal profile and thereby calculating the morphotectonic indices.An aggregated tectonic index(ATI)has been prepared to map the intensity of tectonic perturbations in the fluvial environment using the entropy weightage method(EWM)and Weighted Linear Combination(WLC).The undulating nature of the longitudinal profile with prominent knick points confirms the presence of tectonic disturbances and lithological variations.From all the computed morphotectonic indices and the ATI,it has been evident that the region has experienced surface deformations.When viewed at the entire catchment,the morphotectonic indices suggest ample responses to the tectonic perturbations due to the dominance of lithology-controlled hill slope processes and fluvial erosion.The spatiality of the tectonic sensitiveness is rather concentrated into certain pockets of differential stress field formed due to fault thrusting of the Himalayas.The study chiefly focuses on the peculiarity of the watershed which displays a complex response of tectonic and rock structure;wherein the proposed methodology has been successful in excavating such complex responses around the Himalayan thrusts. | Ujwal Deep SAHA Sohini NEOGY Jhikmik KAR Uttam MUKHOPADHYAY | 2021 | Journal of Mountain Science2021，18，11： | 0 |
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