Metallogenic age of the Changshanhao gold deposit in Inner Mongolia, China

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	Metallogenic age of the Changshanhao gold deposit in Inner Mongolia, China
	Gao Yi 4; Nie FengJun ; Xiao Wei 1; Liu YiFei ; Zhang WeiBo 2; Wang FengXiang
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:7 页码:2092-2100
关键词	Ar-Ar dating Magmatic activity Mineralization Changshanhao gold deposit Inner Mongolia
ISSN号	1000-0569
英文摘要	The Changshanhao gold deposit is a super large gold deposit found in the Bayan Obo belt in recent years, and one of the largest gold mines in China. This paper is focused on the relationship of the magmatic activity and mineralization in the Changshanhao gold deposit. The 4 Ar/39Ar isotopic dating of biotite and muscovite from the auriferous quartz veins in Changshanhao gold deposit indicated that the formation age of biotite was 256. 3 +/- 1. 8Ma and the formation age of muscovite was from 250. 9 +/- 1. 5Ma to 246. 0 +/- 1. 6Ma. Combined with the dating results of the region rock of predecessors, it is inferred that large-scale magmatic activity is not only the important heat source for the mineralization, but also the main material source for the mineralization. The precipitation of oreforming materials from the hydrothermal system is the main ore-forming process in the late magmatic evolution, with the temperature and the pressure decreasing, biotite and muscovite in the ore-bearing hydrothermal successively crystallized, and at the same time, gold and other ore-forming elements in the ore-bearing hydrothermal precipitated and gathered. The western section of the northern margin of the North China craton, is one of the most important gold metallogenic provinces in North China. The gold deposits and prospects hosted by the low-grade metamorphic detrital rocks are widely distributed in two parallel east-west-trending Proterozoic rift belts: the Bayan Obo belt in the north, and the Chaiertaishan belt in the south. Predecessors have done many geological exploration works on the Changshanhao gold deposit. However, the scientific research work remains relative lag, which more or less has influence on the understanding of the deposit and its periphery and deep prospecting work. Based on collecting, restudying the results of previous studies and combined with field geological survey and detailed indoor research work, this research has analyzed the environment and the geological characteristics of the Changshanhao gold deposit, discussed the relationship between the magmatic action and the gold mineralization, summed up the genesis of the deposit, proposed a metallogenic model and prospecting directions. The gold mineralization of the Changshanhao gold deposit occurs in the low-grade metamorphic elastic rocks of the Proterozoic Bayan Obo group as stratoid layer, stratiform and lenticular, the gold mineralization have a close spatial relationship with various types of granitoid intrusions. The granitoid intrusions of the Chanshanhao gold mining area and its adjacent region are mainly formed in the Hercynian Period, can be divided into two phases: the first stage is the early period of Early Permian 9293 +/- 286Ma), the granitoid intrusions occurs as stocks, dyke swarms or apophysis, and the magmatic action lasted about 7Myr, speculated that the magmatic rocks may be the product of the partial melting of the enriched mantle; the second stage is the Middle Permian 9274 268Ma), the granitoid intrusions are A-type granitoids 9Al), which probably formed in the extensional tectonics environment with low pressure and high temperature. On the whole, the late magmatic action in large scale, the early stage granite batholith is exposed, late order to smaller rock strains, lasted about 6Myr. Two granite intrusive age difference of 17Myr body, indicating the environment by extrusion to extensional environment. The Ar-Ar isotopic dating results of the pyrite quartz veins in the Changshanhao gold deposit show that the age of the late stage hydrothermal activity related to the gold mineralization is 256 - 246 Ma. The initial mineralization age of the Changshanhao gold deposit is the Middle Proterozoic, and subjected to the superimposition of Hercynian tectonic and magmatic activities, the mineralization can be divided into two main stages, namely the initial mineralization stage of the Middle Proterozoic and the superimposition stage of Hercynian tectonic and magmatic activities. The Changshanhao gold deposit is a product of Hercynian tectonic-magmatic and fluid-related activities, and which played an important role during the ore-forming processes of the Changshanhao gold deposit.
学科主题	矿床地质
WOS关键词	ISOTOPE GEOCHRONOLOGY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000339456100021
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41562]
专题	中国地质调查局发展研究中心
作者单位	1.CAGS, Inst Mineral Resources, Beijing 100037, Peoples R China 2.China Univ Geosci, Coll Earth Sci & Resources, Beijing 100083, Peoples R China 3.Shijiazhuang Univ Econ, Shijiazhuang 050031, Peoples R China 4.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Gao Yi,Nie FengJun,Xiao Wei,et al. Metallogenic age of the Changshanhao gold deposit in Inner Mongolia, China[J]. ACTA PETROLOGICA SINICA,2014,30(7):2092-2100.
APA	Gao Yi,Nie FengJun,Xiao Wei,Liu YiFei,Zhang WeiBo,&Wang FengXiang.(2014).Metallogenic age of the Changshanhao gold deposit in Inner Mongolia, China.ACTA PETROLOGICA SINICA,30(7),2092-2100.
MLA	Gao Yi,et al."Metallogenic age of the Changshanhao gold deposit in Inner Mongolia, China".ACTA PETROLOGICA SINICA 30.7(2014):2092-2100.