Multiple granitic magma events in Sanjiang complex belt, Yunnan;Province: Implications for tectonic evolution.

	Multiple granitic magma events in Sanjiang complex belt, Yunnan;Province: Implications for tectonic evolution.
	Wang Fang 2; Liu FuLai ; Liu PingHua
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:6 页码:2141-2160
关键词	Zircon U-Pb dating Geochemistry Granitoid rocks Sanjiang complex belt
ISSN号	1000-0569
英文摘要	Sanjiang area is considered as the margin between Indian and Eurasian plates, recording multiple magmatic and metamorphic events. Eight granitoid rocks were collected from Diancang Shan and Gaoligong Shan complex for in situ zircon U-Pb dating and whole-rock geochemistry analysis. Based on geochronology results, six episodes of magmatism were recognized: Mid-Cambrian (501. 2 +/- 5. 0Ma), Late Ordovician (456 +/- 2. 1Ma), Late Permian to Early Triassic (251 similar to 246Ma), Early Paleocene (55 +/- 0. 62Ma) and Late Eocene (38 +/- 0. 52Ma). Abundant Paleoproterozoic and Mid-Neoproterozoic inherited zircons were also indentified. Geochemistry results show that SiO2, Al2O3, Na2O and K2O contents range form 60. 41% to 77. 41%, 11. 57% to 17. 54%, 2. 05% to 4. 16% and 2. 09% similar to 6. 31%, respectively. Early Triassic granitoid rocks are characterized by peraluminous with A/CNK >= 1, predominantly, while others are characterized by metaluminous with A/CNK >= 1. They show obvious fractionation of BEE, negative Eu anomaly and (La/Yb)(N) range from 5. 22 to 19. 56. Five of them have Nd-143/Nd-144 ratios of 0. 51195 to 0. 51255, epsilon(Nd) (t) values of 0 to -11. 11 and Nd model ages (t(DM)) of 1071Ma to 1969Ma. The presences of two older samples suggest Mid-Cambrian and Late Ordovician magmatism. The closure of Paleo-Tethys was responsible for Late Permian to Early Triassic magmatism. The Gaoligong Early Cretaceous granitoid rocks are the magmatic expression of crustal thickening. Cenozoic granitoid rocks are related to subduction-collision between the Indian and Eurasian plates. Inherited zircon yield major age clusters at 1100 similar to 800Ma, indicating Neoproterozoic magmatic event. A few Paleo-Midproterozoic zircons imply the existence of older basement rocks. Nd model ages also support that the Paleoproterozoic and Mid-Neoproterozoic occurred in this area.
学科主题	火成岩岩石学
WOS关键词	SHAN-RED-RIVER ; DIANCANG MOUNTAIN-RANGES ; ARC/BACK-ARC ASSEMBLAGES ; PALEO-TETHYS OROGEN ; PLATE IGNEOUS ROCKS ; SLIP SHEAR ZONE ; ZIRCON U-PB ; WESTERN YUNNAN ; AILAO-SHAN ; METAMORPHIC ROCKS
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322427000020
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40164]
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. Multiple granitic magma events in Sanjiang complex belt, Yunnan;Province: Implications for tectonic evolution.[J]. ACTA PETROLOGICA SINICA,2013,29(6):2141-2160.
APA	Wang Fang,Liu FuLai,&Liu PingHua.(2013).Multiple granitic magma events in Sanjiang complex belt, Yunnan;Province: Implications for tectonic evolution..ACTA PETROLOGICA SINICA,29(6),2141-2160.
MLA	Wang Fang,et al."Multiple granitic magma events in Sanjiang complex belt, Yunnan;Province: Implications for tectonic evolution.".ACTA PETROLOGICA SINICA 29.6(2013):2141-2160.