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| 1 | Geochemistry,Geochronology,Sr-Nd Isotopic Compositions of Jiang Tso Ophiolite in the Middle Segment of the Bangong- Nujiang Suture Zone and Their Geological Significance显示文摘The Jiang Tso ophiolite,situated in the middle segment of the Bangong- Nujiang Suture Zone,is a part of the easternmost Qieli Lake ophiolite subzone and is close to the south of Pung Lake ophiolite. The rock association of Jiang Tso ophiolite is relatively complete and is mainly composed of metamorphic peridotite,gabbro and diabase. Comparing with N-MORB,the ophiolite is high in Mg and low in Ti,K,Na,P,and is depleted in Nb,Ta,Hf,Th and enriched in Rb,Sr and Ba. Geochemical characteristics of the Jiang Tso ophiolite indicate it is of a supra-subduction zone type formed in the spreading ridge of back arc basin. The SHRIMP U-Pb dating of zircons from the gabbro yielded a weighted average age of 188.1±4.1 Ma(MSWD=1.4),indicating the Jiang Tso ophiolite was formed in the late stage of early Jurassic. The Sr,Nd isotopic compositions show that the Tethyan mantle domain is the depleted mantle(DM),with enriched mantle domain II(EM II). They have the same Sr,Nd isotopic composition with the India Ocean MORB type. | HUANG Qiangtai LI Jianfeng CAI Zhourong XIA Lianze YUAN Yajuan LIU Huichuan XIA Bin | 2015 | Acta Geologica Sinica(English Edition)2015，89，2： | 4 |
| 2 | Mineral Chemistry and Geochemistry of Peridotites from the Zedang and Luobusa Ophiolites, Tibet: Implications for the Evolution of the Neo-Tethys显示文摘We present a new dataset on platinum group elements(PGEs), whole-rock major and trace elements, and mineral chemistry for the peridotites from the Zedang and Luobusa ophiolite suites, Tibet, in an attempt to better constrain the petrogenesis of the Zedang and Luobusa ophiolites and the tectonic evolution of the Neo-Tethys. Plots of chondrite-normalized PGE, PGE vs. Mg#, and PGE vs. Al_2O_3 suggest that the lherzolite and harzburgite from Zedang and Luobusa have similar PGE characteristics. The Zedang and Luobusa peridotites display U-shaped REE patterns and are enriched in some incompatible elements, indicative of melt-rock interaction. The PGE characteristics may be attributed to partial melting and heterogeneous melt-rock interaction. Mineral chemistry and whole rock major and trace elements data suggest that lherzolite and harzburgite from Zedang and Luobusa have similar geochemical properties. On the spinel Mg# vs. Cr# plot, the composition of the Zedang and Luobusa peridotites is consistent with both abyssal and subduction-zone peridotites. This study indicates that the Zedang and Luobusa peridotites have a similar origin and evolution path: they could have originated from a normal mid-ocean ridge environment and got refertilization in a supra-subduction zone setting. | Qiang Li Bin Xia Jianfeng Li Lianze Xia Qiangtai Huang Zhongyu Xia | 2015 | Journal of Earth Science2015，26，6： | 3 |
| 3 | Geochronology of the Dong Tso Ophiolite and the Tectonic Environment显示文摘The wedge shaped Dong Tso ophiolitic block is distributed near the transition point from the western to the middle sub–belt of the Bangong–Nujiang suture zone.The ophiolite is characterized by well–developed cumulate rocks that are mainly composed of cumulate and massive gabbros.In the cumulate gabbros,the adcumulate amphiboles are distributed extensively around the plagioclase and residual pyroxene grains;hence,the rocks are named adcumulate amphibole–gabbro.In this study,the formation age of the ophiolite has been estimated to be 166±4 million years(Ma)by the sensitive high–resolution ion microprobe(SHRIMP)II U–Pb isotopic analysis of the zircons from the adcumulate amphibole–gabbro;the40Ar/39Ar plateau age was estimated to be 148.19±1.53 Ma,which should represent the emplacement time of the ophiolite,by isotopic dating of the pure amphibole mineral from the amphibole–schist.Two different suits of volcanic lavas have been recognized in this work.The purple colored pillow basalts have high TiO2and P2O5contents,and are rich in light rare earth elements(LREEs),large–ion lithospheric elements(LILEs)and high–field–strength elements(HFSEs),the characteristics that are the typical of the oceanic island basalt(OIB).On the other hand,other massive basaltic andesites of celadon color are poor in MgO;rich in Fe2O3,LREEs,LILEs,and HFSEs;and especially characterized by negative Nb and Ta anomalies,the properties that establish the andesites as continental arc volcanic rocks.It is concluded that hotspots had developed in the old Dong Tso basin,the oceanic basin that had been developing from middle Jurassic(166 Ma)or even before and emplaced northward in late Jurassic(about 148 Ma). | LI Jianfeng XIA Bin XIA Lianze XU Lifeng LIU Weiliang CAI Zhourong YANG Zhiqing | 2013 | Acta Geologica Sinica(English Edition)2013，87，6： | 2 |
| 4 | Miocene Pliocene planktonic foraminiferal biostratigraphy of the Pearl River Mouth Basin,northern South China Sea | Liu Chunlian 1,2,,Huang Yi 1,Wu Jie 1,Qin Guoquan 3,Yang Tingting 1,2,Xia Lianze 1,Zhang Suqing 1 1.Department of Earth Sciences,Sun Yat-Sen University,Guangzhou 510275,China 2.Guangdong Provincial Key Laboratory of Mineral Resources & Geological Processes,Guangzhou 510275,China 3.Nanhai East Company of China National Offshore Oil Corporation,Guangzhou 510240,China | 2012 | Journal of Palaeogeography2012，1，1： | 1 |
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