Cenozoic granitoid in Tengchong, western Yunnan: Genesis type and;implication for tectonics

	Cenozoic granitoid in Tengchong, western Yunnan: Genesis type and;implication for tectonics
	Dong, FL 5; Hou, ZQ ; Gao, YF ; Zeng, PS ; Jiang, CX
刊名	ACTA PETROLOGICA SINICA
	2006
卷号	22 期号:4 页码:927-937
关键词	Cenozoic granitoid genetic type structural application Tengchong
ISSN号	1000-0569
英文摘要	Cenozoic granitoid developed in Tengchong, an area located in the SE are structural belt of east structural knot of Himalayan orogen, recorded lots of information about the time of India-Asia continental collision, structural evolution and continent dynamics in the area. In term of the lithofacies and intrusion age, the granitoid can be subdivided into monzonite granite, syenogranite, muscovite granite and muscovite-albite granite. The Ar-40/Ar-39 data indicate that ages of the firstly intrusived monzonite granite and muscovite granite range from 66Ma to 58Ma, and ages of the syenogranite and monzonitic granite, which intrusived with a large scale, range between 54 - 52 Ma and 43 - 41 Ma. According to Aluminium Saturation Index (ASI) of the granite, we can conclude that monzonitic granite and syenogranite, which ASI value approaches to 1, belong to metaluminous-peralummous high K calc-alkaline series, and muscovite(-albite) granite (ASI: 1.02 - 2.63) are peraluminous-strongly peraluminous granite. K2O/Na2O value of all the granitoid exceed 1, but from syenogranite, monzonitic granite to muscovite (-albite) granite, K2O/Na2O value and SiO2 content increase gradually. The syenogranite and monzonitic granite are rich in Sr, Ba and poor in Rb, with light-REE enriched and strongly negative Eu anomalies. In constrast, muscovite (-albite) granite are characterized by obviously higher Rb, unusually lower Sr and Ba, and swallow-shaped REE pattern, suggesting that they either originated from different magma reservoir or experienced different melt process. According to magma sequence and rock assemblage, we can conclude: (1) during 66 - 59Ma, contact and strong collision between India and Asia continent happened, resulting in crust thickening greatly and melting in deep part; (2) after 5Ma stress adjusting, short-lived relaxation and hypergene emplacement of syenogranite occurred between 54Ma and 52Ma; (3) during 43-41Ma, crust extension appeared, accompanying with development of monzonite granite and syenogranite.
学科主题	火成岩岩石学
WOS关键词	HIMALAYAN LEUKOGRANITES ; MANASLU LEUCOGRANITE ; NORTHERN PAKISTAN ; SOUTHERN TIBET ; COLLISION ; AGE ; CONSTRAINTS ; ORIGIN ; INDIA ; NEPAL
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000238367700016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38158]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resource, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 3.Shijiazhuang Coll Econ, Shijiazhuang 050031, Peoples R China. 4.Geol Surg Yunnan Prov, Yunnan 671000, Peoples R China. 5.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Dong, FL,Hou, ZQ,Gao, YF,et al. Cenozoic granitoid in Tengchong, western Yunnan: Genesis type and;implication for tectonics[J]. ACTA PETROLOGICA SINICA,2006,22(4):927-937.
APA	Dong, FL,Hou, ZQ,Gao, YF,Zeng, PS,&Jiang, CX.(2006).Cenozoic granitoid in Tengchong, western Yunnan: Genesis type and;implication for tectonics.ACTA PETROLOGICA SINICA,22(4),927-937.
MLA	Dong, FL,et al."Cenozoic granitoid in Tengchong, western Yunnan: Genesis type and;implication for tectonics".ACTA PETROLOGICA SINICA 22.4(2006):927-937.