Ar-40/Ar-39 geochronology of rocks and ores from the Muluozhai REE;deposit in Mianning County, Sichuan province

	Ar-40/Ar-39 geochronology of rocks and ores from the Muluozhai REE;deposit in Mianning County, Sichuan province
	Tian ShiHong 6; Hou ZengQian ; Yuan ZhongXin ; Chen Wen ; Xie YuLing ; Fei HongCai ; Yin ShuPing ; Yi LongSheng ; Zhou Su
刊名	ACTA PETROLOGICA SINICA
	2006
卷号	22 期号:10 页码:2431-2436
关键词	Ar-40/Ar-39 ages nordmarkite Muluozhai REE deposit Mianning County Sichuan Province
ISSN号	1000-0569
英文摘要	The Muluozhai REE deposit is located in the Mianning County, Sichuan Province and at the western side of Yalongjiang River. The Muluozhai REE deposit is tectonically located on the northern Jinpingshan Mountains, a Cenozoic intracontinental orogenic belt in southwestern China. The orebodies occurred in the structural fracture zones and ore veins between the nordmarkite and metamorphic diabase or marble. The Muluozhai district, with an elevation more than 4000 m, is characterized by high mountain and dangerous roads and lower degree of geological research works and has no isotopic data reported on rocks and ores so far. The nordmarkite was previously considered to be formed during the Yanshanian. In this paper, we report Ar-40-Ar-39 dating on microcline from nordmarkite and phlogopite in ores, which yielded a plateau age of 31.2 +/- 0.56Ma and inverse isochronal age of 30.6 +/- 2.6Ma for microcline in nordmarkite, and a plateau age of 35.5 +/- 0.5Ma and inverse isochronal age of 35 +/- 1 Ma for phlogopite in ores, respectively. The different closed temperature of argon isotope system of microcline (about 170 degrees C) and phlogopite (350 degrees C) resulted in the age of microcline younger than that of phlogopite. The relatively large differences suggested that both the orebodies and pluton were in a relatively slow cooling stage with a cooling rate of about 41.9 degrees C/Ma during 35.5 similar to 31.2Ma. The results indicate that the ores and nordmarkite have identical formation ages, belonging to the Himalayan period. Confirmation of the diagenetic and metallogenic ages of the Muluozhai REE deposit is of great significance on understanding the formation ages of the regional igneous rocks and searching for REE mineral resources of the same kind.
学科主题	矿床地质
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000242107500002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38182]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resource, Beijing 100037, Peoples R China. 2.Minist Land & Resources, Key Lab Isotope Geol, Beijing 100037, Peoples R China. 3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 4.Beijing Univ Sci & Technol, Sch Civil & Environm Engn, Beijing 100083, Peoples R China. 5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China. 6.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Tian ShiHong,Hou ZengQian,Yuan ZhongXin,et al. Ar-40/Ar-39 geochronology of rocks and ores from the Muluozhai REE;deposit in Mianning County, Sichuan province[J]. ACTA PETROLOGICA SINICA,2006,22(10):2431-2436.
APA	Tian ShiHong.,Hou ZengQian.,Yuan ZhongXin.,Chen Wen.,Xie YuLing.,...&Zhou Su.(2006).Ar-40/Ar-39 geochronology of rocks and ores from the Muluozhai REE;deposit in Mianning County, Sichuan province.ACTA PETROLOGICA SINICA,22(10),2431-2436.
MLA	Tian ShiHong,et al."Ar-40/Ar-39 geochronology of rocks and ores from the Muluozhai REE;deposit in Mianning County, Sichuan province".ACTA PETROLOGICA SINICA 22.10(2006):2431-2436.