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Mantle Driven Early Eocene Magmatic Flare-up of the Gangdese Arc, Tibet: A Case Study on the Nymo Intrusive Complex

Acta Geologica Sinica(English Edition) 2024年第4期98卷 878-903页

作者： MA Xuxuan Joseph GMEERT CAO Wenrong tian zuolin LIU Dongliang XIONG Fahui LI Haibing Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Jiangsu Donghai Continental Deep Borehole Crustal Activity National Observation and Research Station DonghaiJiangsu 222300China Department of Geological Sciences Neil Opdyke Paleomagnetic LaboratoryUniversity of Florida241 Williamson HallGainesvilleFL 32611USA Department of Geological Sciences and Engineering University of NevadaRenoMS-1721664 N.Virginia St.RenoNV 89557USA

Magmatic periodicity is recognized in continental arcs worldwide, but the mechanism responsible for punctuated arc magmatism is controversial. Continental arcs in the Trans-Himalayan orogenic system display episodic magmatism and the most voluminous flare-up in this system was in early Eocene during the transition from subduction to collision. The close association of the flare-up with collision is intriguing. Our study employs zircon Lu-Hf and bulk rock Sr-Nd isotopes, along with mineral geochemistry, to track the melt sources of the Nymo intrusive complex and the role of mantle magma during the early Eocene flare-up of the Gangdese arc, Tibet. The Nymo intrusive complex is composed of gabbronorite, diorite, quartz diorite, and granodiorite which define an arc-related calc-alkaline suite. Zircon U-Pb ages reveal that the complex was emplaced between ~50–47 Ma. Zircon Hf isotopes yield εHf(t) values of 8.2–13.1, while whole-rock Sr and Nd isotopes yield εNd(t) values of 2.7–6.5 indicative of magmatism dominated by melting of a juvenile mantle source with only minor crustal assimilation(~15%–25%) as indicated by assimilation and fractional crystallization modeling. Together with published data, the early Eocene magmatic flare-up was likely triggered by slab breakoff of subducted oceanic lithosphere at depths shallower than the overriding plate. The early Eocene magmatic flare-up may have contributed to crustal thickening of the Gangdese arc. This study provides important insights into the magmatic flare-up and its significant role in the generation of large batholiths during the transition from subduction to collision.

关键词： mantle magmatic flare-up subduction–collision transition Nymo intrusive complex Gangdese Tibet

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Petrogenesis and Tectonic Implications of the Latest Cretaceous Intrusive Rocks from the Eastern Gangdese Belt,Southeast Tibet

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 891-903页

作者： CHEN Yanfei CHEN Xuanhua ZHANG Zeming SHAO Zhaogang tian zuolin DONG Xin QIN Shengkai YUAN Yuelei Chinese Academy of Geological Sciences Beijing 100037China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

The latest Cretaceous magmatic activity in the eastern segment of the Lhasa terrane provides important insights for tracking the magma source and geodynamic setting of the eastern Gangdese batholith,eastward of eastern Himalayan *** petrological,geochemical and geochronological studies of the intrusive rocks(monzodiorites and granodiorites)of the eastern Gangdese batholith are presented with monzodiorites and granodiorites giving zircon U-Pb crystallization dates of 70-66 Ma and 71-66 Ma withεHf(t)values of−4.8 to+6.2 and−1.9 to+5.3,*** rocks are metaluminous to weakly peraluminous I-type granites showing geochemically arc-related features of enrichment in LREEs and some LILEs,e.g.,Rb,Th,and U,and depletion in HREEs and some HFSEs,e.g.,Nb,Ta,and *** rocks are interpreted to be derived from partial melting of mantle material and juvenile crust,respectively,which are proposed to be triggered by Neo-Tethyan slab rollback during northward subduction,with both experiencing ancient crustal *** studied intrusive rocks formed in a transitional geodynamic setting caused by Neo-Tethyan oceanic flat subduction to slab rollback beneath the eastern Gangdese belt during the latest Cretaceous.

关键词： Neo-Tethyan ocean slab rollback regional tectonics eastern Gangdese batholith Tibet

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The Eocene corundum-bearing rocks in the Gangdese arc, south Tibet:Implications for tectonic evolution of the Himalayan orogen

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Geoscience Frontiers 2018年第5期9卷 1337-1354页

作者： Zeming Zhang Huixia Ding Xin Dong zuolin tian Hongchen Mu Mengmei Li Shengkai Qin Zhixiang Niu Ning Zhang Institute of Geology Chinese Academy of Geological Sciences School of Earth Sciences and Resources China University of Geosciences Beijing

The genesis of Liangguo corundum deposit in the southern Gangdese magmatic arc, east-central Himalaya, remains unknown. The present study shows that the corundum-bearing rocks occur as lenses with variable sizes in the Eocene gabbro that intruded into marble. These corundum-bearing rocks have highly variable mineral assemblage and mode. The corundum-rich rocks are characterized by containing abundant corundum, and minor spinel, ilmenite and magnetite, whereas the corundum-poor and corundum-free rocks have variable contents of spinel, plagioclase, sillimanite, cordierite, ilmenite and magnetite. The host gabbro shows variable degrees of hydration and carbonization. The corundum grains are mostly black, and rarely blue, and have minor Fe O and TiO_2. The spinel is hercynite, with high Fe O and low Mg O contents. The corundum-bearing rocks have variable but high Al_2O_3, FeO and TiO_2, and low SiO_2 contents. Inherited magmatic and altered zircons of the corundum-bearing rocks have similar U e Pb ages(~47 Ma) to the magmatic zircons of the host gabbro, indicating corundum-bearing rock formation immediately after the gabbro intrusion. We considered that emplacement of gabbro induced the contact metamorphism of the country-rock marble and the formation of silica-poor fluid. The channeled infiltration of generated fluid in turn resulted in the hydrothermal metasomatism of the gabbro, which characterized by considerable loss of Si from the gabbro and strong residual enrichment of Al. The metasomatic alteration probably formed under Pe T conditions of ~2.2 -2.8 kbar and ~650 -700℃. We speculate that SiO_2, CaO and Na_2O were mobile, and Al_2O_3, FeO, TiO_2 and high field strength elements remained immobile during the metasomatic process of the gabbro. The Liangguo corundum deposit, together with metamorphic corundum deposits in Central and Southeast Asia, were related to the Cenozoic Himalayan orogeny, and therefore are plate tectonic indicators.

关键词： Corundum deposit Gangdese magmatic arc Metasomatism Gabbro Himalayan orogen

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Metamorphic Evolution and Tectonic Implications of Garnet–Bearing Mica Schist in Sumdo High Pressure Belt from Eastern Lhasa Block, Tibet

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Acta Geologica Sinica(English Edition) 2015年第A02期89卷 3-4页

作者： CHEN Mei YANG Jingsui ZHANG Cong tian zuolin HUANG Jie YU-Huanglu DONG tianci School of Earth Science and Mineral Resources China University of Geosciences Beijing 100083 China State Key Laboratory for Continental Tectonics and Dynamics Institute of Geology Chinese Academy of GeologicalSciences Beijing 100037 China MOE Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space Sciences Peking UniversityBeijing 100871 China

The garnet-bearing mica-quartz schist of the Sumdo high pressure metamorphic beltfrom the Lhasa block is mainly composed of garnet, muscovite, albite, quartz and minor chlorite, rutile and sphene.

关键词： RESEARCH Metamorphic rocks Muscovite Mica Chlorite minerals Garnet Schists

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High-Temperature Metamorphism, Anataxis and Tectonic Evolution of a Mafic Granulite from the Eastern Himalayan Orogen

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Journal of Earth Science 2018年第5期29卷 1010-1025页

作者： Zeming Zhang Huixia Ding Xin Dong zuolin tian Dongyan Kang Hongchen Mu Shengkai Qin Yuanyuan Jiang Mengmei Li School of Earth Sciences and Resources China University of Geosciences Institute of Geology Chinese Academy of Geological Science

The Himalayan Orogen, resulting from the Tertiary collision of Indian and Asian continents, is a natural laboratory for studying metamorphism, partial melting and granite formation of collisional orogens. However, metamorphic and anatectic conditions and timescales of meta-mafic rocks in the Greater Himalayan Sequences （GHS） in the east-central Himalaya remain controversial, in this paper, we conduct a study of petrology and geochronology of mafic granulite from the Eastern Himalayan Syntaxis （EHS）. The mafic granulite with abundant leucosome bands occurs as layers within felsic granulites and is well deformed. The granulite consists of garnet, plagioclase, amphibole and quartz with minor clinopyroxene, orthopyroxene, biotite, rutile, titanite and ilmenite. The garnet has growth compositional zoning and contains abundant mineral inclusions in its core. Peak metamorphic mineral assemblage of the granulite is garnet, amphibole, plagioclase, quartz, clinopyroxene and futile, recording a high-pressure （HP） and high-temperature （HT） peak-metamorphism under conditions of 14-15.5 kbar and 780-790 ℃ in the presence of melt. The reconstructed clockwise P-T path is characterized by an early heating and burial prograde metamorphism, and late isothermal and cooling decompression retrogression. The granulite witnessed a long lasting HT metamorphism, partial melting and melt crystallization process which began at ca. 39 Ma and lasted to ca. 11 Ma. The present study shows that various high-grade rocks of the GHS in the EHS core experienced similar metamorphic conditions and P-T-t paths, indicating that they occurred as a coherent slab during the subduction and exhumation of Indian lithosphere. The significant melts generated during the prograde metamorphism of the GHS rocks not only contributed to the formation of the Himalayan leucogranite, but also resulted in the rheological weakening and ductile flow of the thickened lower crust of the Himalayan Orogen.

关键词： granulite HT metamorphism partial melting timescale collisional orogeny.

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The Garnet Exsolution Texture and Petrological Investigations on a Typical Pelitic Granulite from Eastern Himalaya Syntaxis

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 250-251页

作者： ZHANG Cong tian zuolin LIU Xiaoyu LI Peng YANG Jingsui Institute of Geology Chinese Academy of Geological Sciences National Research Center for Geoanalysis

The ultrahigh pressure(UHP)metamorphism has been documented in the Western Synataxis(Mukherjee et al.,2003)and central part of the high Himalayan(Wang et al.,2015).However,high pressure granulite facies but not

关键词： UHP high

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Pan-African metamorphism and magmatism in the Prydz Belt,East Antarctica:a geochronological perspective

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Advances in Polar Science 2024年第2期35卷 143-156页

作者： BAO Hong WANG Wei-(RZ) LIU Xinshu ZHAO Yue GONG Tingnan LIU Xiaochun CUI Ying tian zuolin Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China China University of Geosciences(Beijing) Beijing 100081China MOE Key Laboratory of Orogenic Belt and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The Prydz Belt in East Antarctica underwent extensive reworking during the late Neoprotertozoic–early Paleozoic Pan-African orogeny,which is characterized by granulite facies,clockwise P–T paths,and high dT/dP *** study compiles the existing age and composition data of zircon and monazite from metamorphic rocks and links their key characteristics to the metamorphic evolution of the Prydz *** frequency of zircon U–Pb ages starts to increase noticeably from~555 Ma,peaking between 530 Ma and 520 Ma,followed by a dramatic decline after 520 *** Th/U values(>0.1)of zircon are observed from~545 Ma,displaying a noticeable increasing trend in Th/U values before a rapid decline from~520 *** frequency of monazite ages progressively increases from~540 Ma,reaching its peak at 515 Ma,and then rapidly decreases after 490 *** with the crystallization behaviors of zircon and monazite,this study suggests that the systematic changes in Th/U values of zircon after 545 Ma indicate a transition in the thermal regime of the Prydz Belt towards the cooling *** growth of zircon and monazite corresponds to the post-peak cooling process,while the crystallization peak of monazite lags behind that of zircon by~5–15 Ma,which indicates a relatively low cooling *** the granitic intrusions accompanied the entire metamorphic evolution,the majority of them are younger than 520 *** results suggest that the Pan-African event likely peaked at~555–545 Ma and gradually cooled to near-solidus conditions at~520–510 Ma,with a relatively slow average cooling process.

关键词： East Antarctica Prydz Belt Pan-African orogeny zircon monazite U–Pb dating

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有效全岩成分的计算方法及其在变质相平衡模拟中的应用

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岩石学报 2020年第9期36卷 2616-2630页

作者：田作林张泽明董昕自然资源部深地动力学重点实验室中国地质科学院地质研究所北京160007

变质相平衡模拟是变质岩领域近几十年最重要的进展之一,它已经成为确定变质作用P-T-t轨迹和探索变质演化过程的有力工具。变质岩的矿物组合不但与其形成的温度(T)和压力(P)条件有关,而且受控于岩石的全岩成分(X)。但是变质岩通常是不均... 详细信息

变质相平衡模拟是变质岩领域近几十年最重要的进展之一,它已经成为确定变质作用P-T-t轨迹和探索变质演化过程的有力工具。变质岩的矿物组合不但与其形成的温度(T)和压力(P)条件有关,而且受控于岩石的全岩成分(X)。但是变质岩通常是不均匀的并且往往保留两期以上的矿物组合,因此计算不同成分域或不同变质演化期次的有效全岩成分是模拟P-T视剖面图的核心问题之一。在中-低温变质岩中,石榴石变斑晶的生长会不断地将其核部成分"冻结"而不参与后续变质反应,这导致根据实测全岩成分计算的P-T视剖面图无法有效地模拟石榴石幔部或边部生长阶段的变质演化过程。"瑞利分馏法"和"球体积法"利用电子探针实测的石榴石成分环带可以模拟计算石榴石各个生长阶段所对应的有效全岩成分,本文推荐使用这两个方法来处理石榴石变斑晶的分馏效应问题。相比较而言,石榴石在高温变质岩中通常无法保留生长阶段的成分环带特征,这是因为石榴石成分在高温条件下会发生扩散再平衡,并同时与多数基质矿物达到热力学平衡,这时一般不需要考虑石榴石的分馏效应。但是高温变质岩通常会发生部分熔融并伴随熔体的迁移,进而改变岩石的有效全岩成分。因此,通过P-T视剖面图模拟熔体迁移前后的变质演化过程需要使用"相平衡法"计算迁移的熔体成分以及熔体迁移前后岩石的有效全岩成分。此外,后成合晶与反应边是变质岩中最常见的退变质反应结构,但是后成合晶或反应边中的矿物之间并未达到热力学平衡。这种情况需要结合岩相学观察和矿物成分,利用最小二乘法确定后成合晶或反应边中发生的平衡反应方程式,进而获取变质反应发生时的有效全岩成分并通过计算P-T视剖面图来估算退变质的温压条件。除此之外,岩石体系中三价铁(Fe2O3)和H2O含量的估算一直以来都是相平衡模拟研究中的难点,本文推荐使用P/T-X(Fe3+/Fetot,MH2O)视剖面图来确定这两个组分的含量,这是因为P/T-X图可以估算各个变质演化阶段或特定矿物组合的Fe2O3或H2O含量。

关键词：有效全岩成分分馏效应熔体迁移后成合晶相平衡模拟

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东喜马拉雅构造结石榴角闪岩变质作用P-T-t轨迹:相平衡模拟与锆石年代学

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岩石学报 2017年第8期33卷 2467-2478页

作者：田作林康东艳穆虹辰中国地质科学院地质研究所北京100037

东喜马拉雅构造结南迦巴瓦杂岩由多种类型的高级变质岩组成,包括片岩、片麻岩、大理岩、石榴角闪岩和基性麻粒岩。石榴角闪岩呈透镜状产出在片麻岩中,可见不连续分布的规模不等的浅色体。石榴角闪岩由石榴石、角闪石、黑云母、斜长石、... 详细信息

东喜马拉雅构造结南迦巴瓦杂岩由多种类型的高级变质岩组成,包括片岩、片麻岩、大理岩、石榴角闪岩和基性麻粒岩。石榴角闪岩呈透镜状产出在片麻岩中,可见不连续分布的规模不等的浅色体。石榴角闪岩由石榴石、角闪石、黑云母、斜长石、石英、金红石、钛铁矿和榍石组成,石榴石变斑晶可见由浅色矿物组成的"白眼圈"。岩相学、矿物化学和相平衡模拟表明石榴角闪岩经历了一条顺时针型的P-T演化轨迹,可划分为两个阶段:(Ⅰ)升温升压的进变质阶段,由石榴石和斜长石斑晶记录,峰期矿物组合为石榴石+角闪石+黑云母+斜长石+石英+金红石+钛铁矿。运用石榴石变斑晶边部和斜长石变斑晶边部成分在视剖面图上的投点确定出峰期温压条件为~11.5kbar、790℃,达到了高压麻粒岩相条件,并经历了部分熔融,产生至少9%的熔体;(Ⅱ)降温降压的退变质阶段,由石榴石边部"白眼圈"冠状体记录。运用平均温压法计算冠状体中黑云母+斜长石+角闪石+石榴石组合的形成温压条件为~7kbar、~750℃。该阶段金红石消失,熔体结晶,并与早期矿物发生回反应。在石榴石角闪岩的锆石中获得了从29.2Ma到10.2Ma的连续变质年龄。由于锆石通常在熔体结晶过程中生长,因此确定该组年龄代表石榴石角闪岩退变质年龄。本文和以前的研究结果表明,南迦巴瓦杂岩中的高温和中温麻粒岩相亚单元具有相似的降温降压P-T轨迹,但高温单元具有较高的变质压力条件,表明其俯冲到了更大的深度。

关键词：石榴角闪岩 P-T-t轨迹相平衡锆石U-Pb定年东喜马拉雅构造结

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喜马拉雅造山带中段亚东地区石榴角闪岩的成因:岩石学和锆石U-Pb年代学

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地质学报 2023年第8期97卷 2495-2511页

作者：韩彦超董昕田作林中国地质科学院地质研究所北京100037 中国地质大学资源学院湖北武汉430074

喜马拉雅造山带中段出露的基性麻粒岩是理解印度大陆前喜马拉雅期演化历史和新生代碰撞造山作用的理想研究对象。本文对亚东多庆湖地区的石榴角闪岩进行了岩石学、全岩主微量元素地球化学和锆石U-Pb年代学研究,揭示了其原岩类型和新生... 详细信息

喜马拉雅造山带中段出露的基性麻粒岩是理解印度大陆前喜马拉雅期演化历史和新生代碰撞造山作用的理想研究对象。本文对亚东多庆湖地区的石榴角闪岩进行了岩石学、全岩主微量元素地球化学和锆石U-Pb年代学研究,揭示了其原岩类型和新生代的变质作用过程。石榴角闪岩的原岩很可能为新元古代(~890 Ma)的玄武岩,具有E-MORB型岩石的地球化学特征。石榴角闪岩具有三期矿物组合:(1)进变质矿物组合可能为石榴子石+角闪石+斜长石+钛铁矿+石英,即石榴子石核部及其中包裹体;(2)峰期矿物组合为石榴子石+角闪石+斜长石+黑云母+石英,即石榴子石边部和基质矿物;(3)退变质矿物组合为角闪石+斜方辉石+斜长石+黑云母+石英,包括退变质域和石榴子石边部的后成合晶矿物。矿物温压计和相平衡模拟表明,石榴角闪岩进变质、峰期和退变质条件分别为609~621℃和0.59~0.65 GPa、805~845℃和0.91~1.04 GPa、825~840℃和0.61~0.68 GPa,经历了峰期高压麻粒岩相的变质作用。锆石U-Pb年代学研究表明,石榴角闪岩的峰期变质时间为34.8~20.3 Ma,退变质时间为18.1~17.7 Ma,可能经历了一个较长期的部分熔融过程。本文研究认为,亚东石榴角闪岩是印度板块向欧亚板块长期俯冲、地壳增厚成因的基性麻粒岩,原岩可能与Rodinia超大陆拼合相关;其以加热埋藏、近等温降压为特征的顺时针P-T轨迹指示了喜马拉雅造山带中段的大喜马拉雅岩系上部构造层位经历了长期持续的地壳增厚和高温麻粒岩相变质作用,以及早中新世(21~17 Ma)相对快速的减压抬升和随后(17 Ma之后)相对缓慢的折返至地表的演化过程。

关键词：锆石U-Pb年龄变质作用喜马拉雅造山带中段亚东

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