ACTA GEOLOGICA SINICA (English Edition)
预征对象V ol. 91 Supp. 1
Apr. 2017
51
ZHAI Qingguo, TANG Yue, HU Peiyuan, XIAO Xuchang and WANG Haitao, 2017. The Beila Ophiolite from the Bangong-Nujiang Suture Zone, Northern Tibetan Plateau. Acta Geologica Sinica (English Edition), 91(supp. 1): 51.
香港英语怎么读The Beila Ophiolite from the Bangong-Nujiang Suture Zone, Northern Tibetan
Plateau
卡的英文
ZHAI Qingguo *, TANG Yue, HU Peiyuan, XIAO Xuchang and WANG Haitao挂盐水
Institute of Geology, Chine Academy of Geological Sciences, Beijing 100037, China
期指交割日
1 Abstract
The Beila ophiolite is located in the middle part of the Bangong-Nujiang suture zone, northern Tibetan plateau. It is a complete ophiolite suite, and plays a key role in understanding the evolution of the Bangong-Nujiang suture zone, as well as the Meso-Tethys Ocean. The Beila ophiolite was compod of peridotite, rpentinite, gabbro, pillow basalt, and minor rodingite. Peridotites compri mainly medium– to coar–grained rpentinized harzburgites and minor plagiocla-bearing lherzolites and dunites. There are some felsic-ultramafic dykes within the peridotite and they are mainly
变化无常的意思是什么春雨古诗>科目一驾考宝典pegmatoidal pyroxenites, coar to fine-grained gabbros, and diabas. Gabbros included isotropic and cumulate gabbros, and they commonly contain minor pegmatoidal gabbros veins. Pillow basalts and basaltic andesites overlaid on the margin of the rpentinized peridotites. Rodingite occurs as lens and/or dykes within the host rpentinized peridotites. Zircon SHRIMP U–Pb dating for two rodingite samples yielded the ages ranging from 172 to 164 Ma. Whole-rock geochemical and zircon Hf isotopic data show that the Beila ophiolite shows SSZ-type ophiolite affinity. Finally, we suggest that the Beila ophiolite was generated in an initial subduction process at the middle Jurassic (164–172 Ma).
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