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| 1 | Geochemistry of adakites and rhyolites from the Neoarchean Gadwal greenstone belt,eastern Dharwar Craton,India:implications for sources and geodynamic setting显示文摘 | Manikyamba C Kerrich R Khanna T.C Subba Rao D.V | | 0，，： | 1 |
| 2 | Geochemical systematics of komatiite-tholeiite and adakite-arc basalt associations:the role of a mantle plume and convergent margin in formation of the Sandur Superterrane,Dharwar Craton,India显示文摘 | Manikyamba C Kerrich R Khanna T.C Krishna A.K Satyanarayanan M | | 0，，： | 1 |
| 3 | Geochemical and isotopic constraints of Neoarchaean fossil plume for evolution of volcanic rocks of Sandur greenstone belt,India显示文摘 | Naqvi S.M Manikyamba C Gnaneshwar Rao T Subba Rao D.V Ram Mohan M Srinivasa Sarma D | | 0，，： | 1 |
| 4 | Geochemistry of the Neoarchaean high-Mg basalts,boninites and adakites form the Kushtagi-Hungund green-stone belt of the eastern Dharwar Craton(EDC); implications for the tectonic setting显示文摘 | Naqvi S.M Khan R.M.K Manikyamba C Ram Mohan M Khanna T.C | | 0，，： | 1 |
| 5 | Evidence of Archaean crustal shortening from deformed pillow lavas:an example from Sandur schist belt,Dharwar Craton显示文摘 | Manikyamba C Naqvi S.M | | 0，，： | 1 |
| 6 | Late Archaean mantle fertility:constraints from metavolcanics of the Sandur schist belt,India显示文摘 | Manikyamba C Naqvi S.M | | 0，，： | 1 |
| 7 | Geochemistry of black shales from the Neoarchean Sandur superterrane,India:first cycle volcanogenic sedimentary rocks in an intraoceanic arc-trench complex显示文摘 | Manikyamba C Kerrich R | | 0，，： | 1 |
| 8 | Crustal growth processes as illustrated by the Neoarchean intraoceanic magmatism from Gadwal greenstone belt,eastern Dharwar Craton,India显示文摘 | Manikyamba C Khanna T.C | | 0，，： | 1 |
| 9 | Geochemical signatures of polygenecity of Banded Iron Formation(BIF)of Archean Sandur greenstone belt(schist belt),Karnataka Nucleus,India显示文摘 | Manikyamba C Balaram V Naqvi S.M | | 0，，： | 1 |
| 10 | Gold mincralisation and alteration of Penakacherla schist belt,India,constraints on Archaean subduction and fluid processes显示文摘 | Manikyamba C Naqvi S.M Ram Mohan M Gnancswar Rao T | | 0，，： | 1 |
| 11 | Neoarchaean Boninites:implications for Archaean subduction processes显示文摘 | Manikyamba C Naqvi S.M Subba Rao D.V Ram Mohan M Khanna T.C Rao T.G Reddy G.L.N | | 0，，： | 1 |
| 12 | Geochemical systematics of komatiite-tholeiite and adakitic-arc basalt asso ciations : The role of a mantle plume and convergent margin in formation of the Sandur Superterrane, Dharwar craton, India 显示文摘 | Manikyamba C Kerrich R Khanna T C | 2008 | Lithos2008，106，： | 1 |
| 13 | 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 |
| 14 | 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 |
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