Early Mesozoic High-Pressure Metamorphism within the <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="on">Lhasa</st1:City> <st1:place w:st="on"><st1:City w:st="on">Block</st1:City>, <st1:country-region w:st="on">Tibet</st1:country-region></st1:place> and Its Implications for Regional Tectonics<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Early Mesozoic High-Pressure Metamorphism within the Lhasa Block, Tibet and Its Implications for Regional Tectonics

详细信息

责任者：Zeng Lingsen (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Jing
刊名：Earth Science Frontiers
出版年：2009
卷期：16(2)
关键词：高压变质作用 ; high pressure metamorphism ; 青藏高原 ; Qinghai-Tibetan Plateau
页码：p.140-151
图表：12 illus., 3 tables, 39 refs.
分类号：0802
issnNo：ISSN1005-2321
isbnNo：CN11-3370/P

摘要

The nearly east-west trending Sumdo-Jiaxing eclogite belt, ～200 km east of Lhasa, occurs within the traditional Late Paleozoic quartzite and carbonate units of the Lhasa block. This belt provides information that constrains how the Cimmerian subcontinent was assembled. The major and trace element data of bulk-rock indicate that these eclogites have preserved an N-MORB type geochemistry, which is also in consistency with their Sr-Nd isotopic systematics. The P-T estimations show that they experienced high pressure metamorphism at ～2.6 GPa and ～650 ℃. Garnet-omphacite-whole rock Sm-Nd isochron yields an age of (239.0±3.5) Ma. This age represents the timing of the high pressure metamorphism that led to the formation of the Sumdo eclogite. These data show that the Sumdo-Jiaxing oceanic block was subducted to a depth of ～75 km and underwent high pressure metamorphism at ～239 Ma.

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