LA-ICP-MS Zircon U-Pb Geochronology and Petrology of the Muchang Alkali Granite,Zhenkang County,Western Yunnan Province,China

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	LA-ICP-MS Zircon U-Pb Geochronology and Petrology of the Muchang Alkali Granite,Zhenkang County,Western Yunnan Province,China
	YANG Yulong; YE Lin; GAO Wei; CHENG Zengtao; TAO Yan
刊名	Acta Geologica Sinica
	2010
卷号	84 期号:6 页码:1488-1499
英文摘要	The Muchang composite intrusion is located about 14 km southeast of the Fengwei town and south of the Baoshan-Zhenkang block.The rift-related intrusion consists of the early-stage riebeckite nordmarkite in the east and west sides and the discontinuous marginal zone,the late-stage main body of dominant riebeckite granite,and minor aegirine granite.Studies on petrological geochemistry and LA-ICP-MS zircon U-Pb dating of the late-stage riebeckite granite,origin and evolution of the Muchang alkali granite and the relationship between the granite and the associated skarn-type Luziyuan Pb-Zn deposit are discussed in this paper.The results show that the Muchang alkali granites belong to A-type granites,which are characterized by enrichment in Al₂O₃,SiO₂,total alkali and Fe, depletion in MgO and CaO contents with high FeO_T/MgO ratios.The REE concentrations are relatively high,exhibiting highly fractionated LREE patterns with significantly Eu negative anomaly. The Muchang granites are obviously enriched in lithophile elements（e.g.,Rb,K,U and Th） and high field strength elements（e.g.,Zr,Hf,Nb,Y and Ga） with high 10000×Ga/Al ratios and depleted in Sr, Ba,Ti,Cr and Ni,which are similar to those of the A-type granites and quite different from those of S-type andⅠ-type granites.The LA-ICP-MS zircon dating results of the Muchang granite gave a weighted mean age of 266.2±5.4 Ma（2σ）,suggesting that they were formed in the stage of extension at the end of post-collision at Middle Permian and the consumption of Paleo-Tethys ocean took place before 266 Ma. It is suggested that the unexposed intermediate-acid intrusive rocks in the Luziyuan ore district,which is the "sister" rocks material of the Muchang granites and related closely to Luziyuan Pb-Zn mineralization,were the product of Middle Permian.
学科主题	矿床地球化学
语种	英语
公开日期	2017-12-13
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6758]
专题	地球化学研究所_矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	YANG Yulong,YE Lin,GAO Wei,et al. LA-ICP-MS Zircon U-Pb Geochronology and Petrology of the Muchang Alkali Granite,Zhenkang County,Western Yunnan Province,China[J]. Acta Geologica Sinica,2010,84(6):1488-1499.
APA	YANG Yulong,YE Lin,GAO Wei,CHENG Zengtao,&TAO Yan.(2010).LA-ICP-MS Zircon U-Pb Geochronology and Petrology of the Muchang Alkali Granite,Zhenkang County,Western Yunnan Province,China.Acta Geologica Sinica,84(6),1488-1499.
MLA	YANG Yulong,et al."LA-ICP-MS Zircon U-Pb Geochronology and Petrology of the Muchang Alkali Granite,Zhenkang County,Western Yunnan Province,China".Acta Geologica Sinica 84.6(2010):1488-1499.