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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 44-46页

作者： LIAN Dongyang yang jingsui LIU Fei DING Yi WU Weiwei ZHAO Hui ZHANG Li HUANG Jian Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China CARMA State Key Laboratory for Continental Tectonics and Dynamics Institute of Geology Chinese Academy ofGeological Sciences Beijing 100037 China School of Earth Science and Mineral Resources China University of Geosciences Beijing 100083 China

Ophiolites, mostly found in orogenic belts, represent fragments of palaeo-oceanic lithosphere emplaced on the continent through tectonic processes （Bizimis et al., 2000; Dilek and Fumes, 2011, 2014; Pearce, 2014）. T... 详细信息

关键词： Peridotite Ophiolites Mineralogy Petrology Geochemistry

Petrogenic Indicator of Zedang Mantle Peridotite, Tibet: Insights from the Unusual Minerals

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 20-21页

作者： GUO Guolin yang jingsui LIU Xiaodong XU Xiangzhen ZHANG Zhongming TIANYazhou XIONG Fahui WU Yong CARMA State Key Laboratory of Continental Tectonic and Dynamics Institute of Geology Chinese Academy ofGeological Sciences Beijing 10003 7 China Fundamental Science on Radioactive Geology and Exploration Technology Laboratory East China Institute ofTechnology Nanchang Jiangxi 330013 China

Resent studies show that a large number of unusual minerals are hosted mainly by chromites in the mantle sections of ophiolites （Bai et al., 2000;yang et al., 2007; yang et al., 2015）. These minerals include native elements, oxides, carbides, PGE and base metal alloys, sulphides, silicates and have significant potential petrogenic and geodynamic significance.

关键词： PETROGENESIS RESEARCH PERIDOTITE MINERALS MINERALOGY EARTH'S mantle

“Subduction Initiation” for the Genesis of Podiform Chromite Deposits

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 122-123页

作者： ZHOU Meifu ROBINSON Paul T SU Benxun GAO Jianfeng LI Jianwei yang jingsui MALPAS John Department of Earth Sciences The University of Hong Kong Hong Kong China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of SciencesBeijng China

There is a diversity of unusual minerals and mineral inclusions associated with podiform chromitites. The presence of these minerals suggests that grains of arnphibolite （plagioclase, amphibole and zircon） and eclog... 详细信息

关键词： RESEARCH Subduction zones Amphibolites Basins (Geology) Subduction (Geology) Chromite

High- and Ultrahigh-pressure Metamorphism and Retrogressive Textures of Gneiss in the Donghai Area——Evidence from gneisses in drillhole ZK2304

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Acta Geologica Sinica(English Edition) 1999年第3期73卷 300-315,370页

作者： LIU Fulai, XU Zhiqin, XU Huifen and yang jingsui Institute of Geology, CAGS, 26 Baiwanzhuang Rd., Beijing 100037 Zhu Xiling CAGS Inst Geol Beijing 100037 Peoples R China

In the gneisses from the drillhole ZK2304 of the Donghai area, there have been preserved high- and ultrahigh-pressure metamorphic mineral assemblages, a series of complicated retrogressive textures and relevant metamorphic reactions. In addition to garnet, jadeititic-clinopyroxene and rutile, other peak stage (M2) minerals in some gneisses include phengite, aragonite and coesite or quartz pseudomorphs after coesite. The typical peak-stage mineral assemblages in gneisses are characterized by garnet + jadeitic-clinopyroxene + rutile + coesite, garnet + jadeitic-clinopyroxene + phengite + rutile ± coesite and garnet + jadeitic-clinopyroxene + aragonite + rutile ± coesite. The grossular content (Gro) in garnet is high and may reach 50. 1 mol%. The SiO2 content of phengite ranges from 54.37% to 54.84% with 3.54-3.57 p.f.u. Quartz pseudomorphs after coesite occur as inclusions in *** gneisses of the Donghai area have been subjected to multistage recrystallization and exhibit a closewise P-T evolutional path characterized by the near-isothermal decompression. The inclusion assemblage (Hb+Ep+Bi+Pl+Qz) within garnet and other minerals has recorded a pre-peak stage (Mi) epidote amphibole fades metamorphic event. High- and ultrahigh-pressure peak metamorphism (M2) took place at T=750-860℃ and P>2.7 GPa. The symplectitic assemblages after garnet, jadeitic-clinopyroxene and rutile imply a near-isothermal decompression metamorphism (M3, M4) during the rapid exhumation. Several lines of evidence of petrography and metamorphic reactions indicate that both gneisses and eclogites have experienced ultrahigh-pressure metamorphism in the Donghai area. This research may be of great significance for an in-depth study of the metamorphism and tectonic evolution in the Su-Lu ultrahigh-pressure metamorphic belt.

关键词： gneiss high- and ultrahigh-pressure metamorphism retrogressive texture drillhole Donghai area

Peridotites and Chromitites from the Dingqing Ophiolite in the Eastern Segment of Bangong–Nujiang Suture Zone, Tibet: Occurrence Characteristics and Classifications

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 23-25页

作者： LI Guanlong yang jingsui BO Rongzhong LIU Fei RUI Huichao XIONG Fahui GUO Tengfei Center for Advanced Research on the Mantle(CARMA) Key laboratory of Deep-Earth Dynamics of Ministry of Natural ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037 School of Earth Sciences and Resources China University of GeosciencesBeijing 100083 School of Earth Sciences China University of GeosciencesWuhan 430074Hebei The Second Geo-Exploration Institute of CMGB Fuzhou 350108Fujian

The Dingqing ophiolite is located in the eastern segment of the Bangong-Nujiang suture zone. This suture zone is W–E trending parallel with the Yarlung–Zangbo suture zone and is an strategic area for exploring chromite deposits in China. The Dingqign ophiolite is distributed in near SE-NW direction. According to the spatial distribution, the Dingqing ophiolite is sudivided into two massifs, including the East and the West massifs. The Dingqing ophiolite covers an area of nearly 600 km2. This ophiolite is composed of peridotite, pyroxenite, gabbro, diabase, basalt, plagiogranite and chert(Fig. 1). The peridotite is the main lithology of the Dingqing ophiolite. The peridotite covers about 90% of the total area of the Dingqing ophiolite. The Dingqing ophiolite is dominated by harzburgite with a small amounts of dunite. The Dingqing harzburgite displays different textures, such as massive, Taxitic, oriented and spherulitic textures(Fig. 2d–i). These four types of harzburgite occur in both the East and West massifs, especially in the Laraka area of the eastern part of the East massif. Dunites have different occurrences in the field outcrops, such as lenticular or stripshaped, thin-shell and agglomerate varieties(Fig. 2a–c). On the basis of detailed field work, we have discovered 83 chromitite bodies, including 27 in the East massif and 56 in the West massif. According to the occurrence scale and quantity of the chromitite bodies, we have identified four prospecting areas, namely Laraka, Latanguo, Langda and Nazona. Chromitites in the Dingqing ophiolite show different textures, including massive, disseminated, veined and disseminated-banded textures(Fig. 3). On the basis of the Cr#(=Cr/(Cr+Al)×100) of chromite, we have classified the Dingqing chromitite into high-Cr, medium high chromium type, medium chromium type and low chromium type chromitite(Figs. 4, 5). Among them, low chromium type chromitite Cr# is extremely low, ranging from 9.23 to 14.01, with an average of 11.8

关键词： peridotite chromitite occurrence classification Bangong-Nujiang suture zone

Mineralogical and Geochemical Constraints on the Origin of the Ultramafic Rocks from Wuwamen Ophiolite at the Southern Margin of Middle Tianshan, Xinjiang

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 70-71页

作者： NIU Xiaolu yang jingsui LIU Fei FENG Guangying .TIAN Yazhou ZHANG Lan GAO Jian ZHAO Yijue CARMA State Key Laboratory of Continental Tectonics and Dynamics Institute of Geology Chinese Academy ofGeological Sciences Beijing 100037 School of Earth Sciences and Mineral Resources China University of Geosciences Beijing 100083

Wuwamen ophiolite is located at the southern margin of Middle Tianshan, Xinjiang Province. In this paper, petrology, mineralogy and geochemistry of the ultramafic rocks from Wuwamen ophiolite were studied to constrain their origin and tectonic setting. The studies will be helpful in interpreting the evolution process of the South Tianshan Ocean.

关键词： RESEARCH Petrology Mineralogy Geochemistry Ultrabasic rocks Ophiolites

Petrological and Re-Os Isotopic Constraints on the Origin and Tectonic Setting of the Cuobuzha Peridotite, Yarlung Zangbo Suture Zone, SW Tibet, China

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 10-11页

作者： FENG Guangying yang jingsui Yildirim DILEK LIU Fei XIONG Fahui CARMA Institute of GeologyChinese Academy of Geological Sciences Department of Geology& Env.Earth Science Miami University

The Yarlung Zangbo Suture Zone（YZSZ）in southern Tibet includes the remnants of Neotethyan oceanic lithosphere and marks a major suture between the Indian Plate to the south and the Lhasa Terrane of Tibet to the north（Dupuis et al.,2005;yang et al.,2011）.In the western part of the YZSZ,the Northern and the Southern sub-belts form two sub-parallel zones of mafic–ultramaficrockassemblageswithoverlapping crystallization ages（Xiong et al.,2011;Hebért et al.,2012;Liu et al.,2015）.The upper mantle section of the Cuobuzha ophiolite in the northern sub-belt of the Yarlung–Zangbo Suture Zone（YZSZ）in SW Tibet comprises mainly clinopyroxene（cpx）–rich and depleted *** in the cpx-harzburgites show lower Cr#values（12.6–15.1）than the spinels in the harzburgites（26.1–34.5）,and the cpx-harzburgites display higher heavy rare earth element concentrations than the depleted *** harzburgites have subchondritic Os isotopic compositions（0.11624–0.11699）,whereas the cpx-harzburgites have suprachondritic 187Os/188Os ratios（0.12831–0.13125）with higher Re concentrations（0.380-0.575 ppb）.The cpx-harzburgites plot in a Re ***2O3 diagram as a result of subsequent addition of Re following the last partial melting event that occurred during mid-ocean ridge melt evolution processes（Uysal et al.,2015）.Although these geochemical and isotopic signatures suggest that both peridotite types in the ophiolite represent mid-ocean ridge type upper mantle units,their melt evolution trends reflect different mantle *** cpx-harzburgites formed from low-degree partial melting（;%）of a primitive mantle source,and they weresubsequently modified by melt–rock interactions in a mid-ocean ridge *** depleted harzburgites,on the other hand,were produced by re-melting of the cpx-harzburgites,which later interacted with MORB-or island arc tholeiite（IAT）-like melts（Fig.1）possibly in a trench-distal backarc spreading *** new isotopic and geochemical data from the Cuob

关键词： Os Yarlung Zangbo Suture Zone China Re

Petrological, Geochemical and the Origin of the Cuobuzha Peridotite in the Western Yarlung Zangbo Suture Zone

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 10-11页

作者： FENG Guangying yang jingsui XIONG Fahui LIU Fei NIU Xiaolu LIAN Dongyang WANG Yunpeng ZHAO Yijue CARMA State Key Laboratory of Continental Tectonics and Dynamics Institute of Geology Chinese Academy ofGeological Sciences Beijing 10003 7 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China

Ophiolites are fragments of ancient oceanic lithosphere emplaced onto continental margins, accretionary prisms, or island arcs during plate collisions （Dilek and Fumes, 2011）. The well-preserved ophiolitic sequence ... 详细信息

关键词： PETROLOGY RESEARCH PERIDOTITE OPHIOLITES IGNEOUS rocks ORTHOPYROXENE

Geogenesis and Characteristics of the Western Part of the Yarlung Zangbo Ophiolites, Tibet

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 52-55页

作者： LIU Fei yang jingsui LIAN Dongyang ZHAO Hui ZHANG Lan NIU Xiaolu FENGGuangying ZHANG Li HUANG Jian CARMA State Key Laboratory of Continental Tectonic and Dynamics Institute of Geology Chinese Academy ofGeological Sciences Beijing 100037 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Department of Geology and Mineral Resources China University of Geosciences Beijing 100083 China

The ophiolites that crop out discontinuously for more than 2000 km along the Yarlung-Zangbo suture zone （YZSZ, also called the Indus-Tsangpo suture） in southern Tibet are the remnants of the Neotethyan oceanic litho... 详细信息

关键词： Geology Ophiolites Lithosphere Zircon Mid-ocean ridges Rare earths

Kalaymyo Peridotite Massif in the Indo-Myanmar Ranges(Western Myanmar): Its Mineralogy and Petrology

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 24-25页

作者： NIU Xiaolu LIU Fei yang jingsui Yildirim DILEK XU Zhiqin FENG Guangying XIONG Fahui Kyaing SEIN CARMA Key Laboratory of Continental Tectonics and DynamicsInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037P.R.China Department of Geology&Environmental Earth Science Miami UniversityOxfordOH 45056USA Myanmar Geosciences Society

Mesozoic ophiolites crop out discontinuously in the Indo-Myanmar Ranges in NE India and Myanmar,and represent the remnants of the Neotethyan oceanic lithosphere(Sengupta et al.,1990;Mitchell,1993).These ophiolites in the Indo-Myanmar Ranges are the southern continuation of the Neotethyan ophiolites occurring along the Yarlung Zangbo Suture Zone(YZSZ)in southern Tibet farther northwest(Mitchell,1993;Fareeduddin and Dilek,2015),as indicated by their coeval crystallization ages and geochemical compositions(yang et al.,2012;Liu et al.,2016).The Kalaymyo ophiolite is located in the central part of the eastern Indo-Myanmar Ranges(Fig.1).composition of these ophiolites from the central Tibetan Plateau(CTP)is dominated by MORBs and minor OIBs and a distinct lack of IATs and BONs,which is inconsistent with most ophiolites worldwide(Robinson and Zhou,2008;Zhang et al.,2008).But the generation and tectonic nature of these ophiolites are still controversial.*The Kalaymyo peridotites consist mainly of harzburgites,which show typical porphyroclastic or coarse-grained equigranular *** are composed ofolivine(Fo=89.8–90.5),orthopyroxene(En86-91Wo1-4Fs8-10;Mg#=89.6–91.9),clinopyroxene(En46-49Wo47-50Fs3-5;Mg#=90.9–93.6)and spinel(Mg#=67.1–78.9;Cr#=13.5–31.5),and have relatively homogeneous whole-rock compositions with Mg#s of90.1–90.8 and Si O2(41.5–43.65 wt.%),Al2O3(1.66–2.66wt.%)and Ca O(1.45–2.67 wt.%)***(LREE)-depleted chondrite-normalized REE patterns with(La/Yb)CN=0.04–0.21 and(Gd/Yb)CN=0.40–0.84,and show a slight enrichment from Pr to La with(La/Pr)CN in the range of 0.98–*** Kalaymyo peridotites are characterized by Pd-enriched chondrite-normalized PGE patterns with superchondritic(Pd/Ir)CN ratios(1.15–2.36).Their calculated oxygen fugacities range between QFM–0.57 and QFM+*** mineralogical and geochemical features collectively suggest that the Kalaymyo peridotites represent residual upper mantle rocks after low to mo

关键词： La Pd Kalaymyo Peridotite Massif in the Indo-Myanmar Ranges Western Myanmar Its Mineralogy and Petrology