Metamorphic evolution of meta-sedimentary rocks within the Diancang;Shan-Ailao Shan metamorphic complex belt

	Metamorphic evolution of meta-sedimentary rocks within the Diancang;Shan-Ailao Shan metamorphic complex belt
	Wang Fang 2; Liu FuLai ; Liu PingHua
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:2 页码:630-640
关键词	Mineral transformation Pseudosection P-T path Amphibolite-granulite-facies metamorphism Meta-sedimentary rocks Diancang Shan-Ailao Shan metamorphic complex belt
ISSN号	1000-0569
英文摘要	Meta-sedimentary rocks, characterized by intensive migmatization and/or mylonization, are widely distributed within the Diancang Shan-Ailao Shan metamorphic complex belt. On the basis of detailed mineralogical and petrographic observations, four metamorphic stages have been recognized, including early prograde metamorphic stage (M-1), peak amphibolite-granulite facies metamorphic stage (M-2), near isothermal decompression retrograde stage (M-3), and late amphibolite facies retrograde stage (M-4). Metamorphic P-T conditions for each stage were calculated by P-T pseudosection, and geothemobarometer (GB-GASP) and two-mica thermometer. The mineral assemblage for the early prograde assemblage (M,) is characterized by Pl + Ms + Qtz + St +/- Ky +/- Bt +/- Kfs, which as inclusions are preserved in the core of garnet, and formed at 560 similar to 590 degrees C and 5.5 similar to 6.3kb. The typical mineral assemblage for the peak amphibolite-granulite facies metamorphic stage (M-2) assemblage is represented ay Grt + Bt + Ky/Sil + Pl + Qtz or Grt + Bt + Pl + Qtz +/- Kfs +/- Sil, recording P-T conditions of 720 similar to 760 degrees C and 8.0 similar to 9.3kb. The near isothermal decompression retrograde stage (M-3) is indicated by a mineral assemblage of Grt + Bt + Sil + Pl + Qtz, which were formed at P-T conditions of 640 similar to 760 degrees C and 5.0 similar to 7.3kb. Abundant retrogressive minerals, including fine-grained biotite and muscovite, together Pl + Qtz Kfs Grt were formed at the late amphibolite facies retrograde stage (M-4), which occurred at P-T conditions of 521 similar to 648 degrees C and 4.0 similar to 5.0kb. The integrated clockwise P-T path revealed by the meta-sedimentary rocks indicates that the Diancang Shan-Ailao Shan metamorphic complex belt experienced a tectonic evolution of subduction-collision-exhumation, which was related to the amalgamation between the Indian and Eurasian plates.
学科主题	变质岩岩石学
WOS关键词	RIVER SHEAR ZONE ; RED-RIVER ; BIOTITE GEOTHERMOMETER ; SOUTHEASTERN TIBET ; SE ASIA ; CHINA ; VIETNAM ; GARNET ; YUNNAN ; STABILITY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000317531300020
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40074]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Wang Fang,Liu FuLai,Liu PingHua. Metamorphic evolution of meta-sedimentary rocks within the Diancang;Shan-Ailao Shan metamorphic complex belt[J]. ACTA PETROLOGICA SINICA,2013,29(2):630-640.
APA	Wang Fang,Liu FuLai,&Liu PingHua.(2013).Metamorphic evolution of meta-sedimentary rocks within the Diancang;Shan-Ailao Shan metamorphic complex belt.ACTA PETROLOGICA SINICA,29(2),630-640.
MLA	Wang Fang,et al."Metamorphic evolution of meta-sedimentary rocks within the Diancang;Shan-Ailao Shan metamorphic complex belt".ACTA PETROLOGICA SINICA 29.2(2013):630-640.