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Microstructures,Deformation Mechanisms and Seismic Properties of Synkinematic Migmatite from Southeastern Tibet:Insights from the Migmatitic Core of the Ailao Shan-Red River Shear Zone,Western Yunnan,China

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Journal of Earth Science 2024年第4期35卷 1149-1169页

作者： Weiwei Ma Bo Zhang fulong cai Baoyou Huang Lei Zhang Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing100871China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing100085China

Seismic anisotropy originating within the continental crust is commonly used to determine the deformation and kinematic flow within active orogens and is attributed to regionally oriented mica or hornblende ***,naturally deformed rocks usually contain compositional layers(e.g.,parallel compositional banding).It is necessary to understand how both varying mineral contents and differing intensities of compositional layering influence the seismic properties of the deep *** this study,we analyzed the seismic response of migmatitic amphibolite with compositional banding *** present the microstructures,fabrics,calculated seismic velocities,and seismic anisotropies of mylonitic amphibolite from a horizontal shear layer preserved within the Ailao Shan-Red River shear zone,southwestern Yunnan,*** investigated sample is characterized by pronounced centimeter-scale compositional *** microstructures and fabrics suggest that migmatitic amphibolite rocks within deep crust may delineate regions of deformation-assisted,channelized,reactive,porous melt *** origin of compositional banding in the studied migmatitic amphibolite is attributed primarily to partial melting together with some horizontal shearing *** microfabrics and structures investigated in this study are considered to be typical for the base of active horizontal shear layers in the deep crust of southeastern *** responses are modeled by using crystal preferred orientations for minerals of the migmatitic amphibolite by applying the Voigt-Reuss-Hill homogenization *** P-wave and S-wave velocities are largely consistent in the various layers of the ***,seismic anisotropies of P-wave(AV_(p))and S-wave(AVs)are higher in the melanosomes(AV_(p)=5.6%,AV_(s)=6.83%)than those in the leucosomes and the whole rock(AV_(p)=4.2%–4.6%,AV_(s)=3.1%–3.2%).In addition,there is pronounced,S-wave splitting oblique to the foliation plane in the migm

关键词： deformation-assisted melt flow seismic anisotropy microstructure compositional banding migmatite deep crust southeastern Tibet

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Origin of middle Miocene leucogranites and rhyolites on the Tibetan Plateau: Constraints on the timing of crustal thickening and uplift of its northern boundary

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Chinese Science Bulletin 2012年第5期57卷 511-524页

作者： ZHANG LiYun DING Lin YANG Di XU Qiang cai fulong LIU DeLiang Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100085China Graduate University of Chinese Academy of Sciences Beijing 100049China

Leucogranites 玩在理解外壳的变厚的一个重要角色，融化在大陆人 collisional 带，和高原以内高举。地调查证明来自霍·克西尔·莱克区域的中新世的火的岩石主要由二云母的 leucogranites 和流纹岩组成。我们学习了由锆石 U-Pb，白云母... 详细信息

Leucogranites 玩在理解外壳的变厚的一个重要角色，融化在大陆人 collisional 带，和高原以内高举。地调查证明来自霍·克西尔·莱克区域的中新世的火的岩石主要由二云母的 leucogranites 和流纹岩组成。我们学习了由锆石 U-Pb，白云母和 sanidine 40Ar/39Ar 地球年代学的 Bukadaban 二云母的 leucogranites 和凯考·莱克， Malanshan 和 Hudongliang 流纹岩，和整个岩石的 geochemical 和 Sr-Nd 同位素的分析。结果为 9.7 的 Bukadaban leucogranites 产出结晶化和冷却年龄 ????? ‰ ?????? 椠湯獯桰牥捩吗？？

关键词：淡色花岗岩时间约束地壳增厚青藏高原中中新世流纹岩自然科学基金会边界

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Processes of initial collision and suturing between India and Asia

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Science China Earth Sciences 2017年第4期60卷 635-651页

作者： DING Lin Satybaev MAKSATBEK cai fulong WANG HouQi SONG PeiPing JI WeiQiang XU Qiang ZHANG LiYun Qasim MUHAMMAD Baral UPENDRA Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Researchand Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of SciencesBeijing 100101China University of the Chinese Academy of Sciences Beijing 100049China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

The initial collision between Indian and Asian continents marked the starting point for transformation of land-sea thermal contrast,uplift of the Tibet-Himalaya orogen,and climate change in *** this paper,we review the published literatures from the past 30 years in order to draw consensus on the processes of initial collision and suturing that took place between the Indian and Asian *** a comparison of the different methods that have been used to constrain the initial timing of collision,we propose that the tectono-sedimentary response in the peripheral foreland basin provides the most sensitive index of this event,and that paleomagnetism presents independent evidence as an alternative,reliable,and quantitative research *** contrast to previous studies that have suggested collision between India and Asia started in Pakistan between ca.55 Ma and50 Ma and progressively closed eastwards,more recent researches have indicated that this major event first occurred in the center of the Yarlung Tsangpo suture zone(YTSZ) between ca.65 Ma and 63 Ma and then spreading both eastwards and *** continental collision is a complicated process,including the processes of deformation,sedimentation,metamorphism,and magmatism,different researchers have tended to define the nature of this event based on their own understanding,an intuitive bias that has meant that its initial timing has remained controversial for ***,we recommend the use of reconstructions of each geological event within the orogenic evolution sequence as this will allow interpretation of collision timing on the basis of multidisciplinary methods.

关键词： Timing of initial collision between the Indian and Asian continents Collision criteria Transform fault Subduction zone Magmatism Deformation

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Petrology of metamorphic rocks from the Atbashy complex,Southern Tien-Shan,Kyrgyzstan

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Geoscience Frontiers 2018年第6期9卷 1795-1807页

作者： Maksatbek Satybaev Lin Ding Akira Takasu Apas Bakirov Kadyrbek Sakiev fulong cai Rustam Orozbaev Azamat Bakirov Janybek Baslakunov Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Geoscience Shimane University1060 NishikawatsuMatsue 690-8504Japan Institute of Geology National Academy of Sciences30 ErkindikBishkek 720040Kyrgyzstan Research Center for Ecology and Environment of Central Asia(Bishkek) 30 ErkindikBishkek 720040Kyrgyzstan

The high-to ultrahigh-pressure metamorphic rocks of the Atbashy complex were petrologically investigated. The eclogites of the Choloktor Formation show a prograde evolution from epidote-blueschist facies(P = 17-21 kbar and T = 450-515 ℃) to peak eclogite-UHP conditions(P = 26-29 kbar and T = 545-615 ℃) with a subsequent epidote-amphibolite and greenschist facies overprint. The micaschists of the Choloktor Formation also show a clockwise P-T path from blueschist/epidote-blueschist facies conditions through peak eclogite facies conditions(P = 21-23 kbar and T = 530-580 ℃) to retrograde epidote-amphibolite and greenschist facies stages. A comparison of the P-T paths in the eclogites and mica-schists of Choloktor Formation reveal that they may have shared their P-T history from peak to retrograde stages. The mica-schists of the Atbashy Formation record peak metamorphism of P = 10-12 kbar and T = 515-565 ℃, which indicates that the highest grade of regional metamorphism in the Atbashy Ridge was epidote-amphibolite *** newly obtained P-T conditions for the mica-schists of Choloktor Formation indicate that sheets of sedimentary rocks were brought to great depths along the subduction zone and they metamorphosed under eclogite facies HP conditions. The eclogite blocks were amalgamated with mica-schists of Choloktor Formation in the eclogite facies HP conditions and together they experienced isothermal decompression to ～40 km. During this path, the eclogites and mica-schists of Choloktor Formation docked with mica-schists of Atbashy Formation at 10-12 kbar and 515-565 ℃, and from this depth(～40 km) the whole sequence was exhumed together. These new results improve our understanding of high-pressure metamorphism in subduction-related accretionary prism zones and the exhumation processes of deeply-seated rocks in the Atbashy HP-UHP complex.

关键词： Eclogite Mica-schists P-T conditions Atbashy Kyrgyz Tien-Shan

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Stable isotopes of modern herbivore tooth enamel in the Tibetan Plateau: Implications for paleoelevation reconstructions

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Chinese Science Bulletin 2010年第1期55卷 45-54页

作者： XU Qiang DING Lin ZHANG LiYun YANG Di cai fulong LAI QingZhou LIU Jing SHI RenDeng Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Fossil tooth enamel from herbivores is considered one of the best proxies for paleoclimate and paleoelevation reconstructions, due to its low susceptibility to diagenetic alteration. A synthesis of oxygen and carbon isotope analyses of modern tooth enamel from herbivores such as Tibetan yaks, asses and antelopes is assessed. The average δ 13C(PDB) value of herbivore tooth enamel in the Lhasa and south Qiangtang terrains is-11.3‰± 1.1‰, whereas in the north Qiangtang and Hoh Xil terrains value is-10.2‰± 1.4‰ consistent with the current C3-dominant ecotype in the Tibetan Plateau. In addition, the average δ18O(PDB) values from tooth enamel show a northward systematic increase from-11.8‰± 3.4‰ in the Gyirong Basin, to-11.1‰± 1.1‰ in the Lhasa and southern Qiangtang terrains, and then to-9.0‰± 1.1‰ in the northern Qiangtang and the Hoh Xil areas, similar to those of the local river water and precipitation variation trends. It is suggested that δ 18O(PDB) values of tooth enamel should not be used directly to evaluate the paleo-elevation of the Tibetan Plateau, because oxygen isotopic composition from tooth enamel is a com-bination of drinking water (precipitation-and river-sourced) and diet (plant-sourced). Moreover, an empirical relationship between oxygen isotope of tooth enamel and modern river water, and as well as elevation is recommended, which can be used in future studies of Tibetan Plateau paleoelevation.

关键词：稳定同位素草食动物青藏高原珐琅质牙齿可可西里地区碳同位素分析氧同位素组成

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Microstructures， deformation mechanisms and seismic properties of synkinematic migmatite from southeastern Tibet: insights from the migmatitic core of the Ailao Shan-Red River shear zone， western Yunnan， China

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Journal of Earth Science 2022年

作者： Ma Weiwei Zhang Bo cai fulong Huang Baoyou Zhang Lei The Key Laboratory of Orogenic Belts and Crustal Evolution， School of Earth and Space Sciences， Peking University Institute of Tibetan Plateau Research， Chinese Academy of Sciences

Seismic anisotropy originating within the continental crust is commonly used to determine the deformation and kinematic flow within active orogens and is attributed to regionally oriented mica or hornblende grains. However， naturally deformed rocks usually contain compositional layers (e.g.， parallel compositional banding). It is necessary to understand how both varying mineral contents and differing intensities of compositional layering influence the seismic properties of the deep crust. In this study， we analyzed the seismic response of migmatitic amphibolite with compositional banding structures. We present the microstructures， fabrics， calculated seismic velocities， and seismic anisotropies of mylonitic amphibolite from a horizontal shear layer preserved within the Ailao Shan-Red River Shear Zone， southwestern Yunnan， China. The investigated sample is characterized by pronounced centimeter-scale compositional banding. The microstructures and fabrics suggest that migmatitic amphibolite rocks within deep crust may delineate regions of deformation-assisted， channelized， reactive， porous melt flow. The origin of compositional banding in the studied migmatitic amphibolite is attributed primarily to partial melting together with some horizontal shearing deformation. The microfabrics and structures investigated in this study are considered to be typical for the base of active horizontal shear layers in the deep crust of southeastern Tibet. Seismic responses are modeled by using crystal preferred orientations for minerals of the migmatitic amphibolite by applying the Voigt-Reuss-Hill homogenization method. Calculated P-wave and S-wave velocities are largely consistent in the various layers of the migmatite. However， seismic anisotropies of P-wave (AVp) and S-wave (AVs) are higher in the melanosomes (AVp=5.6%， AVs=6.83%) than those in the leucosomes and the whole rock (AVp=4.2%-4.6%， AVs=3.1%-3.2%). In addition， there is pronounced， S-wave splitting oblique to the foliat

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The behaviour of ^(59)Fe in marine microhabitat

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Acta Oceanologica Sinica 1989年第3期8卷 423-429页

作者： cai fulong, Chen Ying, Xu Pi’an and Oiu Manhua Third Institute of Oceanography, State Oceanic Administration, Xiamen, China Third Inst. of Oceanography SOA Xiamen China. China

Under the artificial condition the 59Fe morphology in sea water, its concentration in sediment and phytoplankton, its distribution and metabolism in tissue organs of marine animals were studied. The results showed that the morphology of 59Fe was in a particulate state in sea water. The adsorption rule of 59Fe by three kinds of sediments was similar. The concentration ability of 59Fe by phytoplankton was very strong. The critical concentration organs of S9Fe by marine animals were viscera. The gross radioactivity of 59Fe was mainly concentrated in protein. The concentration factor of 59Fe by DNA was the highest one. After excretion experiment, 59Fe of all the tissue organs was not detected. Small part of59Fe remained in the organic acid and protein state. There was a redistribution process in sediment for59Fe.

关键词： Fe in marine microhabitat The behaviour of

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The behaviour of methionine in the model marine habitat

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海洋学报(英文版) 1988年第4期7卷 602-606页

作者： cai fulong, Chen Ying, Huang Lingyi and Lin Rongsheng Third Institute of Oceanography, State Oceanic Administration, Xiamen, China Third Institute of Oceanography State Oceanic Administration Xiamen China China

The behaviour of free methionine in the artificial marine habitat and the characteristic of absorption by clam were studied by trace method. The results showed that more than 70% of free methionine was utilized by marine organisms. The percentage of concentration methionine in suspended matter, Platymonas, sediment and clam was 11.4%, 24%, 7.8% and 34% respectively. The main path of absorption was viscera, seconded by mantle and gill. It was transferred to muscle after 24 h. The direct absorption of methionine from sea water by clam was more important and faster than that from food.

关键词： methionine habitat behaviour utilized transferred faster suspended gross mantle filtered

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Study on the mussel (Mytilus viridis ) as an ^(90)Sr contaminative bioindicator of a sea area

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Acta Oceanologica Sinica 1991年第4期10卷 635-636页

作者： cai fulong, Chen Ying, Huang LingyiThird Institute of Oceanography, Stale Oceanic Administration, Xiamen 361005, China

It is well known that mussels have been applied more and more to monitoring marine pollution, and have been reported on the marine radioactive monitoring. The majority concentrates the attention on the study of monitoring active products. However, the report on monitoring fission products is rare. T. R. Rice reported that the phytoplankton could concentrateSr, but its drawback is too large mobility to reflect the radioactive level of the specific sea area. For this purpose, the paper applies the mussel, which life range is more fixed, to discuss the possibility of monitoringSr.

关键词： area Study on the mussel Sr contaminative bioindicator of a sea area

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The impact of several chemical poisons on the absorbing 45Caby the Arca granosa

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Acta Oceanologica Sinica 1992年第3期11卷 435-440页

作者： cai fulong, Chen Ying and Huang Lingyi Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

-The impact of several chemical poisons on the Arca granosa absorbing 45Ca was studied. The results showed that the absorption of 45Ca in the blood and the soft tissue by Arca granosa was inhibited by the inorganic compounds of Cu, Zn, Pd, Cd, Hg and so on, among which the inhibition of Cd was the strongest, next was that of Cu and Hg. But the inhibition of the absorption of 45Ca in the shell of Arca granosa was little. The impact of three kinds of energy metabolism inhibitory substances on the absorption of 45Ca by the Area granosa showed that the absorption was an active transfer process.

关键词： Ca The impact of several chemical poisons on the absorbing 45Caby the Arca granosa

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