Late Ordovician Wanbaogou granitoid pluton from the southern margin of;the Qaidam basin: Zircon SHRIMP U-Pb age, Hf isotope and geochemistry

	Late Ordovician Wanbaogou granitoid pluton from the southern margin of;the Qaidam basin: Zircon SHRIMP U-Pb age, Hf isotope and geochemistry
	Wang XiaoXia 7; Hu NengGao ; Wang Tao ; Sun YanGui ; Ju ShengCheng ; Lu XinXiang ; Li Shan ; Qi QiuJu
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:9 页码:2950-2962
关键词	Rapakivi-textured granitoids Zircon SHRIMP U-Pb age Geochemistry Southern margin of the Qaidam basin Central orogen belt
ISSN号	022HC
英文摘要	The Wanbaogou pluton, located in the southern margin of the Qaidam basin, contains porphyro-texture quartz monzonite, rapakivi-textured monzogranite and medium grained monzogranite as well as mafic magmatic enclaves. Zircon SHRIMP U-Pb dating for the rapakivi-textured monzogranite yields 441 +/- 5Ma. The granitoids are high K calc-alkalic series and metaluminous with large variation in SiO2(62.20% similar to 75.32%), high in K2O (3.58% similar to 5.15%) and Na2O + K2O (>7%), and A/CNK of 0.98 similar to 1.09. They have high ratios in K2O/Na2O(>1), FeOT/MgO (3.4 similar to 6.5) and Ga/Al (2.3 similar to 3.1), deplete in Ba, Sr, Nb, P and Ti but rich in Ta, Hf and Zr, showing some features of A-type granite. The epsilon(Hf)(t) and t(DM2) of the granite change from-1.1 to 10.5 and 744 Ma to 1490Ma, respectively, suggesting mult-sources for the granitoids. The large e(Hf)(t) (ca. 10) values and young t(DM2) (744Ma) indicate juvenile component involved in the formation of the granitoids. All above features, together with the regional geology, suggest that the granitoids are in an extensional setting of post collision. The granitoids are similar to the Mesozoic rapakivi-textured granitoids of the Qinling orogen in texture and geological setting, showing that there two periods rapakivi-textured granitoids occurring in the central orogen belt in China.
学科主题	火成岩岩石学
WOS关键词	A-TYPE GRANITES ; RAPAKIVI GRANITE ; QINLING OROGEN ; LASER-ABLATION ; TRACE-ELEMENT ; LU-HF ; PETROGENESIS ; ORIGIN ; ROCKS ; MAGMATISM
WOS研究方向	Geology
语种	中文
WOS记录号	WOS:000309947500022
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39543]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, MLR Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Changan Univ, Xian 710064, Peoples R China. 3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 4.Inst Qinghai Prov Geol Survey, Xining 810012, Peoples R China. 5.Henan Acad Geol Sci, Inst Geol, Zhengzhou 450054, Peoples R China. 6.China Univ Geosci, Beijing 100083, Peoples R China. 7.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Wang XiaoXia,Hu NengGao,Wang Tao,et al. Late Ordovician Wanbaogou granitoid pluton from the southern margin of;the Qaidam basin: Zircon SHRIMP U-Pb age, Hf isotope and geochemistry[J]. ACTA PETROLOGICA SINICA,2012,28(9):2950-2962.
APA	Wang XiaoXia.,Hu NengGao.,Wang Tao.,Sun YanGui.,Ju ShengCheng.,...&Qi QiuJu.(2012).Late Ordovician Wanbaogou granitoid pluton from the southern margin of;the Qaidam basin: Zircon SHRIMP U-Pb age, Hf isotope and geochemistry.ACTA PETROLOGICA SINICA,28(9),2950-2962.
MLA	Wang XiaoXia,et al."Late Ordovician Wanbaogou granitoid pluton from the southern margin of;the Qaidam basin: Zircon SHRIMP U-Pb age, Hf isotope and geochemistry".ACTA PETROLOGICA SINICA 28.9(2012):2950-2962.