Metallogenic chronology of boron deposits in the eastern Liaoning;Paleoproterozoic rift zone

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	Metallogenic chronology of boron deposits in the eastern Liaoning;Paleoproterozoic rift zone
	Lu, YF 4; Chen, YC ; Li, HQ ; Xue, CJ ; Chen, FW
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2005
卷号	79 期号:3 页码:414-425
关键词	boron deposits isotope chronology Pb-Pb isochron Ar-40-Ar-39 dating Paleoproterozoic eastern Liaoning
ISSN号	1000-9515
英文摘要	Lead isotopic analytic data of 30 ores gathered from the Zhuanmiao boron deposit, Wengquangou boron (iron) deposit and its Dongtaizi Ore Member constitute three isochrons, the corresponding ages of which are 1902 +/- 12 Ma, 1852 +/- 9 Ma and 1917 +/- 48 Ma. Lead isotopic analyses of marble from the Xiquegou Member of the Qingchenzi orefield yield a Pb-Pb isochron age of 1844 +/- 27 Ma. Ar-40-Ar-39 quick neutron activation dating of phlogopites and microclines coexisting with ore minerals in the Wengquangou boron (iron) and Zhuanmiao boron deposits shows that: (1) the phlogopite from the Wengquangou has a plateau age of 1923 +/- 1.5 Ma and an isochron age of 1924 +/- 2.5 Ma; (2) the microcline from the Wengquangou has the plateau age of 1407 +/- 5.4 Ma and 220 +/- 12 Ma and an isochron age of 1403 +/- 19 Ma; (3) the phlogopites from the Zhuanmiao yield a plateau age 1918 +/- 13 Ma and an isochron age of 1918 +/- 2.9 Ma; (4) the microclines from the Zhuanmiao yield the plateau age of 1420 +/- 16 Ma and 250 +/- 8 Ma and an isochron age of 1425 +/- 19 Ma and 269 +/- 16 Ma. These ages indicate that the eastern Liaoning area happened around 1900 Ma, an important tectonomagmatic event, which is consistent with the worldwide Mid-Proterozoic tectonomagmatic event. During this period, the Proterozoic Liaohe Group was folded and underwent strong normal metamorphism, and the (hydrothermal) sedimentary boron deposits (or source beds) formed earlier were strongly superimposed by mineralization, resulting in enrichment of boron; later regional geological processes made little contribution to the formation of the boron deposits. Lead isotopic components show that the U-Pb and Th-Pb isotopic system reached homogenization in the ores whereas only the U-Pb isotopic system reached homogenization in the marble from the Xiquegou district, which indicates that the boron deposits superimposed in the studied area endured a relatively strong process of hydrothermal migmatization during the end phase of early Proterozoic metamorphism.
学科主题	矿床地质
WOS关键词	PB-PB
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000230120100015
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37883]
专题	中国地质调查局武汉地质调查中心
作者单位	1.Yichang Inst Geol & Mineral Resources, Hubei 443003, Peoples R China. 2.Chinese Acad Geol Sci, Beijing 100037, Peoples R China. 3.Changan Univ, Xian 710054, Shaanxi, Peoples R China. 4.中国地质调查局武汉地质调查中心
推荐引用方式 GB/T 7714	Lu, YF,Chen, YC,Li, HQ,et al. Metallogenic chronology of boron deposits in the eastern Liaoning;Paleoproterozoic rift zone[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2005,79(3):414-425.
APA	Lu, YF,Chen, YC,Li, HQ,Xue, CJ,&Chen, FW.(2005).Metallogenic chronology of boron deposits in the eastern Liaoning;Paleoproterozoic rift zone.ACTA GEOLOGICA SINICA-ENGLISH EDITION,79(3),414-425.
MLA	Lu, YF,et al."Metallogenic chronology of boron deposits in the eastern Liaoning;Paleoproterozoic rift zone".ACTA GEOLOGICA SINICA-ENGLISH EDITION 79.3(2005):414-425.