|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Petrogenesis of highly fractionated I-type granites in the Zayu area of eastern Gangdese, Tibet: Constraints from zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopes显示文摘The Cretaceous granitoids in the middle and northern Gangdese, Tibet are generally interpreted as the products of anatexis of thickened deep crust genetically associated with the Lhasa-Qiangtang collision. This paper reports bulk-rock major element, trace element and Sr-Nd isotopic data, zircon U-Pb age data, and zircon Hf isotopic data on the Zayu pluton in eastern Gangdese, Tibet. These data shed new light on the petrogenesis of the pluton. Our SHRIMP zircon U-Pb age dates, along with LA-ICPMS zircon U-Pb age dates recently reported in the literature, indicate that the Zayu pluton was emplaced at about 130 Ma, coeval with Early Cretaceous magmatic rocks in other areas of eastern Gangdese (e.g., Rawu, Baxoi areas) and the Middle Gangdese. The Zayu pluton samples lack amphibole and muscovite, and are compositionally characterized by high SiO2 (69.9%―76.8%), K2O (4.4%―5.7%), and low P2O5 (0.05%―0.12%). These samples also have A/CNK values of 1.00-1.05, and are enriched in Rb, Th, U, and Pb, and depleted in Ba, Nb, Ta, Sr, P, Ti, and Eu. These geochemical features suggest that the Zayu pluton samples are metaluminous to slightly peraluminous and are of highly fractionated I-type granite. The Zayu pluton samples have high εNd(t) values (-10.9--7.6) and low initial 87Sr/86Sr ratios (0.7120- 0.7179) relative to melts derived from mature continental crust in the Gangdese (e.g., Ningzhong Early Jurassic strongly peraluminous granite). The Zayu pluton samples are heterogeneous in zircon εHf(t) values (-12.8--2.9), yielding ancient zircon Hf crustal model ages of 1.4―2.0 Ga. The data obtained in this study together with the data in the recent literature suggest that the Early Cretaceous granitoids in eastern Gangdese represent the eastward extension of the Early Cretaceous magmatism in the middle Gangdese, and that the Lhasa micro-continent block with ancient basement may extend for ~2000 km from east to west. Zircon Hf isotopic data and bulk-rock zircon saturation temperature (789-821℃) indicate that mantle-derived materials likely played a role in the generation of the Zayu pluton. We propose that the Zayu pluton was most likely generated in a setting associated with southward sub- duction of the Bangong-Nujiang ocean floor, where mantle wedge-derived magmas may have providedthe heat and material for the anatexis of ancient crust of the Lhasa micro-continent, resulted in hybrid melts (i.e., mantle-derived basaltic magmas + crust-derived felsic magmas). Such hybrid melts with subsequent fractional crystallization are responsible for the highly evolved Zayu pluton (crust thick- ening is not a prerequisite). | ZHU DiCheng MO XuanXue WANG LiQuan ZHAO ZhiDan NIU Yaoling ZHOU ChangYong YANG YueHeng | 2009 | Science China Earth Sciences2009，52，9： | 107 |
| 2 | Constraining quantitatively the timing and process of continent-continent collision using magmatic record: Method and examples显示文摘Based on the main driving force of plate motion(the slab pull force generated by the descent of the oceanic plate in subduction zones) and the three primary mechanisms for magma generation(adding fluid, increasing temperature, and decreasing pressure), the continent-continent collisional process has been divided into three stages, including initial collision, ongoing collision, and tectonic transition. These stages are characterized by normal calc-alkaline andesitic magma(dehydration of the oceanic crust to release fluids), the migration of calc-alkaline magma toward the trench(dehydration of the oceanic crust or an increase in temperature) or small-scale crust-derived peraluminous magma(heat from intra-crustal shearing), and extensive magmatism with compositional diversity induced by slab break-off(increasing temperature and decreasing pressure), respectively.On the basis of the obtained age of slab break-off, the timing of the initial continent-continent collision can be quantitatively back-dated using the convergence rate, depth of slab break-off, and subduction angle. The spatio-temporal migration of the magmatic activity of the Gangdese Batholith, the onset of magmatic flare-up, and the increase of magma temperature at 52–51Ma documented by the volcanic rocks of the Linzizong Pana Formation were most likely the result of the break-off of the Yarlung-Zangbo Neo-Tethyan oceanic lithosphere at approximately 53 Ma. This proposed age of slab break-off suggests that the initial India-Asia collision likely occurred at approximately 55–54 Ma, which is consistent with the collision ages constrained by other abundant geological data(60–55 Ma). This magmatic method has been applied to the Bitlis orogenic belt in southern Turkey in the Arabia-Eurasia continental collision zone, yielding an age range of approximately 29–22 Ma for the initial Arabia-Asia continental collision that is close to the collision ages recently obtained by apatite fission-track dating(approximately20 Ma) and regional tectonic shortening(approximately 27 Ma). The intense folding of the Upper Cretaceous and the angular unconformity between the overlying Linzizong volcanic rocks in the southern Lhasa Terrane(90.69 Ma) are not related to the initial continental collision between India and Asia, but can be interpreted as the consequences of the strong coupling between the hot and young subducting oceanic crust immediately south of the spreading ridge and the overriding lithosphere or the subduction of the Neo-Tethys oceanic plateaux or seamounts. The tectonic event documented by the angular unconformity between the Linzizong Dianzhong Formation and the Nianbo Formation lasted approximately 3 Ma and likely marks the initial India-Asia collision. The significant deceleration of the Indian continent at approximately 51 Ma can be attributed to the disappearance of the slab pull force in the subduction zone due to the break-off of the Yarlung-Zangbo Neo-Tethyan oceanic lithosphere. The descent of the eclogitized lower crust of the northern Indian continent provides the main driving force for the current northward motion of Indian plate. The weak deformation of the lithospheric plate in the overriding plate of the India-Asia collisional zone between 60 and 40 Ma can be attributed to the high-angle subduction related to the rollback of the Yarlung-Zangbo Neo-Tethyan oceanic lithosphere after the initial India-Asia continental collision, the presence of the thick crust and high elevation on the southern margin of the Lhasa Terrane, and the decoupling between the mid-upper and lower crust and between the lower crust and lithospheric mantle of the Indian continent. | ZHU DiCheng WANG Qing ZHAO ZhiDan | 2017 | Science China Earth Sciences2017，60，6： | 23 |
| 3 | Porphyry mineralization in the Tethyan orogen显示文摘The Tethyan metallogenic domain(TMD),as one of the three major domains in the world,extends over 10000 km from east to west,and has developed several world-class metallogenic belts,such as the Gangdese porphyry Cu belt,the Sanjiang metallogenic belt,the Iran porphyry Cu belt,the Pakistan porphyry Cu belt,the southeastern European epithermal gold deposit belt,and the Southeast Asian Sn belt.The formation and evolution of the TMD is mainly controlled by the multi-stage subduction of Tethys oceanic slabs,the opening and closing of several small ocean basins,and continent-continent collision.The Tethys oceans include the Proto-Tethys(Cambrian-Silurian),Paleo-Tethys(Carbonaceous-Triassic)and Neo-Tethys(Jurassic to Cretaceous),which in turn are formed by rifting from the Gondwana land at different times in different micro-continents.With a series of geological processes such as oceanic opening and closing,continental collision and post-collisional reworking with intraplate deformation,various types of ore deposits are developed in the TMD,including porphyry deposits,epithermal deposits,VMS deposits,chromite deposits,Sn deposits and orogenic gold deposits.The metallogenic processes of the TMD can be categorized into three stages.(1)Oceanic subduction:With the subduction of the oceanic slab and dehydration of basalt and sediments,the asthenospheric mantle was metasomatized with preliminary enrichment in metals under oxidized condition.(2)Continental subduction:Continental collision induced partial melting of the mantle wedge enriched the metals and water in mafic melts,which ascended from subarc depths to the lower crust,locally to the shallow crust for hydrothermal mineralization.(3)Post-collisional reworking:Partial melting of the mafic intrusives in the lower crust produced felsic melts under oxidized and water-rich conditions,which underwent crystal fractionation and transferred water and metals into hydrothermal fluids for mineralization.The large-scale porphyry mineralization in the TMD mainly occurs in the Miocene,which is an important scientific issue worthy of further study in the future.How is the metal enriched in the processes of gradual maturity of the crust,and how does large-scale mineralization occur in a collisional orogen where there is no subduction and dehydration of oceanic slabs anymore to supply S and Cl?These are still important questions in the study of porphyry mineralization in the Tethyan orogen.The application of hyperspectral and mineralogical studies of alteration assemblages is beneficial for prospecting and exploration in the TMD. | Rui Wang Dicheng Zhu Qing Wang Zengqian Hou Zhiming Yang Zhidan Zhao Xuanxue Mo | 2020 | Science China Earth Sciences2020，63，12： | 5 |
| 4 | Geochemical investigation of Early Cretaceous igneous rocks along an east - west traverse throughout the central Lhasa Terrane, Tibet 显示文摘 | Zhu Dicheng Mo Xuanxue Niu Yaoling | 2009 | Chemical Geology2009，2009，： | 1 |
| 5 | Ages and tectonic significance of the collision-related granite porphyries in the Lhunzhub Basin, Tibet, China显示文摘The Paleocene collision-related granite porphyries are identified for the first time along the western margin of the Lhunzhub Basin, Tibet. SHRIMP U-Pb zircon analysis indicates that the granite porphyries were emplaced at 58.7±1.1 Ma (MSWD = 0.79) during the Indo-Asian continental collision. The granite porphyries are peraluminous and high in K, belonging to the calc-alkaline to high-K calc-alkaline series. They are relatively enriched in LILE, Th and LREE and depletion in Ba, Nb, P and Ti, characterized by LREE-enriched patterns with slightly to moderately negative Eu anomalies. These Paleocene granite porphyries are interpreted as the products generated by partial melting of the pre-existing arc crustal rocks caused by the increase of pressures and temperatures during the crustal shortening at the early stages of the Indo-Asian continental collision since 65 Ma. Despite inherited geochemical features and tectonic settings of the arc protoliths, they are significantly different from the volcanic rocks of the Dianzhong Formation within the Linzizong Group and the Miocene granite por- phyries in the Gangdise belt. | WANG LiQuan ZHU DiCheng GENG QuanRu LIAO ZhongLi PAN GuiTang | 2007 | Chinese Science Bulletin2007，52，12： | 1 |
| 6 | Dynamic stability of axially accelerating viscoelastic plates with longitudinally varying tensions显示文摘The dynamic stability of axially accelerating plates is investigated.Longitudinally varying tensions due to the acceleration and nonhomogeneous boundary conditions are highlighted.A model of the plate combined with viscoelasticity is applied.In the viscoelastic constitutive relationship,the material derivative is used to take the place of the partial time derivative.Analytical and numerical methods are used to investigate summation and principal parametric resonances,respectively.By use of linear models for the transverse behavior in the small displacement regime,the plate is confined by a viscous damping force.The generalized Hamilton principle is used to derive the governing equations,the initial conditions,and the boundary conditions of the coupled planar vibration.The solvability conditions are established by directly using the method of multiple scales.The Routh-Hurwitz criterion is used to obtain the necessary and sufficient condition of the stability.Numerical examples are given to show the effects of related parameters on the stability boundaries.The validity of longitudinally varying tensions and nonhomogeneous boundary conditions is highlighted by comparing the results of the method of multiple scales with those of a differential quadrature scheme. | Youqi TANG Dengbo ZHANG Mohan RUI Xin WANG Dicheng ZHU | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，12： | 1 |
| 7 | Petrogenesis of the earliest Early Cretaceous mafic rocks from the Cona area of the eastern Tethyan Himalaya in south Tibet: Interaction between the incubating Kerguelen plume and the eastern Greater India lithosphere?显示文摘 | Dicheng Zhu Xuanxue Mo Guitang Pan Zhidan Zhao Guochen Dong Yuruo Shi Zhongli Liao Liquan Wang Changyong Zhou | 2007 | LITHOS2007，，1： | 1 |
| 8 | Petrogenesis of volcanic rocks in the Sangxiu Formation, central segment of Tethyan Himalaya: A probable example of plume–lithosphere interaction显示文摘 | Dicheng Zhu Guitang Pan Xuanxue Mo Zhongli Liao Xinsheng Jiang Liquan Wang Zhidan Zhao | 2006 | Journal of Asian Earth Sciences2006，，2： | 1 |
| 9 | Early cretaceous subduction-related adakite-like rocks of the Gangdese Belt, southern Ti- bet:Products of slab melting and subsequent melt-peridotite interaction? 显示文摘 | Zhu Dicheng Zhao Zhidan Pan Guitang | 2009 | Journal of Asian Earth Sciences2009，34，： | 1 |
| 10 | Geochemical investigation of Early Cretaceous igneous rocks along an east-west traverse throughout the central Lhasa Terrane, Tibet显示文摘 | Zhu Dicheng Mo Xuanxue Niu Yaoling | 2009 | Chemical Geology2009，268，： | 1 |
| 11 | The Lhasa Terrane: Record of a microcontinent and its histories of dril and growth显示文摘 | Zhu Dicheng Zhao Zhidan Niu Yaoling | 2011 | Earth and Planetary Science Letters2011，301，： | 1 |
| 12 | POSITIVE SOLUTIONS TO BOUNDARY VALUE PROBLEMS OF FRACTIONAL DIFFERENTIAL EQUATIONS WITH PARAMETER显示文摘In this paper,we consider a class of nonlinear fractional differential equation boundary value problem with a parameter.By some fixed point theorems,sufficient conditions for the existence,nonexistence and multiplicity of positive solutions to the system are obtained.An example is given to illustrate the main results. | Qi Wang Dicheng Lu Rui Wang Yayun Fang | 2014 | Annals of Differential Equations2014，30，2： | 0 |
| 13 | EXISTENCE OF THREE SOLUTIONS TO NONLINEAR DISCRETE DIRICHLET PROBLEM INVOLVING p-LAPLACIAN显示文摘In this paper, we study a nonlinear Dirichlet boundary value problem for difference equations involving the p-Laplacian with two positive parameters. One result on the existence of at least three solutions for this problem is obtained using critical point theory. | Qi Wang Dicheng Lu | 2014 | Annals of Differential Equations2014，30，4： | 0 |
| 14 | Subduction Initiation and Generation of the Xigaze Ophiolite, Southern Tibet显示文摘The Cretaceous Xigaze ophiolite is best exposed at the central Yarlung Zangbo Suture Zone(YZSZ,Tibet)which also includes the Gangdese arc and the Xigaze forearc basin.This study reports new geochronological and geochemical data for this ophiolite to revisit its geodynamic and petrogenetic evolution.The | DAI Jingen WANG Chengshan Zhu Dicheng POLAT Ali LI Yalin | 2015 | Acta Geologica Sinica(English Edition)2015，89，A02： | 0 |
| 15 | Petrogenesis of granitic pegmatite veins:Perspectives from major element and B isotope in tourmalines,Chakabeishan,Northern Tibetan Plateau显示文摘The petrogenesis of regionally zoned granitic pegmatite veins remains debated.Because of the economic significance,we carried out a study on the Chakabeishan(CKBS)pegmatite-type Li-Be deposit,eastern North Qaidam Tectonic Belt,Northern Tibetan Plateau,by means of in-situ major element and B isotope compositions of tourmalines in the beryl-bearing and spodumene-bearing pegmatite veins.Tourmalines(Tur-Be)from the beryl-bearing pegmatite are homogeneous schorl with low Mg/(Mg+Fe),high Na/(Na+Ca)and Y Al,suggesting that they are of magmatic origin.Two generations of tourmalines(TurLi)from the spodumene-bearing pegmatite are identified:(i)the crystal cores(mostly elbaite and Lirich schorl with subordinate schorl)are consistent with being of magmatic origin crystallized at the magmatic stage;(ii)the crystal rims(schorl)are best understood as the overgrowth at the later hydrothermal stage.Tur-Be and Tur-Li show an obvious difference in core-to-rim B isotopic variation trend with d11B decrease in Tur-Be and increase in Tur-Li.The core-to-rim d11B decrease in Tur-Be results from degassing during its host pegmatitic melt evolution,whereas the core-to-rim d11B increase in Tur-Li is related to fluid exsolution.The estimated d11B values for the initial melts of the beryl-bearing and spodumenebearing pegmatites are10.46‰and10.78‰,respectively,indicating that they most likely originate from protracted fractional crystallization/differentiation of granitic intrusions rather than partial melting of metapelite.Both Mg/(Mg+Fe)ratios and Li abundances in the cores of Tur-Be are lower than those of Tur-Li,suggesting that Tur-Li crystallizes from chemically more evolved melts. | Wenli Sun Zhidan Zhao Yaoling Niu Chunjing Wei Guochen Dong Xiaowei Li Wanming Yuan Tao Wang Bingzhang Wang Tong Pan Jie Han Hongliang Cao Yan Tang Dicheng Zhu | 2023 | Geoscience Frontiers2023，14，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员