The Yeniutan granodiorite in Sunan County, Gansu Province, China:;petrological features, geological setting and relationship to tungsten;mineralization

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	The Yeniutan granodiorite in Sunan County, Gansu Province, China:;petrological features, geological setting and relationship to tungsten;mineralization
	Mao, JW 4; Zhang, ZH ; Lehmann, B ; Zhang, ZC ; Yang, YM ; Wang, ZL
刊名	EPISODES
	2000
卷号	23 期号:3 页码:163-171
ISSN号	0705-3797
英文摘要	The 460 Ma-old Yeniutan granodiorite intrusion is spatially and temporally associated with the Ta' ergou tungsten deposit, one of the recently explored large tungsten resources in northwest China. It is located in the North Qilian Caledonian-aged belt and consists of a granodiorite main phase cut by dikes of biotite granite. The country rock is the Early Proterozoic Beidahe Group and Ordovician volcanic rocks which are overprinted by a 500 similar to 800 m wide thermal metamorphic aureole. The granodiorite has a coarse-grained and pseudoporphyritic texture and is composed of variable amounts of amphibole, pyroxene, biotite, plagioclase, quartz and alkali feldspar perthite. Accessory minerals are sphene, magnetite, zircon, apatite and allanite. The biotite granite is fine- to medium-grained, and is composed of plagioclase, K-feldspar, quartz and biotite with accessory apatite, zircon and thorite.;The SiO2 content of the granodiorite ranges from 57 to 63 wt%, the Al index (Na+K/Al) varies from 0.43 to 0.58. The SiO2 content of the biotite granite ranges from 65 to 66 wt% and its Al index varies from 0.43 to 0.58. The two granitic rocks share similar characteristics of trace elements and rare earth elements. Their contents of compatible components such as V, Ba, Co, Ni, Cr and Sr are high, the Rb content ranges from 20 to 188 ppm, and their Rb/Sr ratios are mainly between 0.3 and 0.6. The REE content of the granodiorite ranges from 141 to 241 ppm, the La/Yb ratio varies from 10 to 31, delta Eu from 0.6 to 0.8. The total REE amount of the biotite granite is about 160 ppm, the La/Yb ratio varies from 19 to 36, and delta Eu from 0.5 to 0.9. All geochemical indicators reflect an evolution from pseudoporphyritic granodiorite to biotite granite at a generally low degree of fractionation.;Sr and O isotope data indicate a high degree of contamination and assimilation in the upper crust. Unlike most tungsten granite suites in which the latest intrusive unit is genetically associated with tungsten mineralization, the main-phase granodiorite of the Yeniutan intrusion is related to tungsten mineralization. With the regional geological evolution as the background and in light of geochemical data, zircon U-Pb and other dating, the Yeniutan granodiorite and its related tungsten mineralization are deduced to have formed in a pre-collisional rather than a collisional setting.
学科主题	火成岩岩石学
WOS关键词	NORTHERN QILIAN MOUNTAINS ; ORE-DEPOSITS ; EVOLUTION ; GRANITES ; SERIES
WOS研究方向	Geology
语种	英语
出版者	INT UNION GEOLOGICAL SCIENCES
WOS记录号	WOS:000166975300003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37391]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Deposits, Beijing 100037, Peoples R China. 2.Tech Univ Clausthal, Inst Mineral & Mineral Resources, D-38678 Clausthal Zellerfeld, Germany. 3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, 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	Mao, JW,Zhang, ZH,Lehmann, B,et al. The Yeniutan granodiorite in Sunan County, Gansu Province, China:;petrological features, geological setting and relationship to tungsten;mineralization[J]. EPISODES,2000,23(3):163-171.
APA	Mao, JW,Zhang, ZH,Lehmann, B,Zhang, ZC,Yang, YM,&Wang, ZL.(2000).The Yeniutan granodiorite in Sunan County, Gansu Province, China:;petrological features, geological setting and relationship to tungsten;mineralization.EPISODES,23(3),163-171.
MLA	Mao, JW,et al."The Yeniutan granodiorite in Sunan County, Gansu Province, China:;petrological features, geological setting and relationship to tungsten;mineralization".EPISODES 23.3(2000):163-171.