Zircon U-Pb geochronology, geochemistry and tectonic implications of Triassic A-type granites from southeastern Zhejiang, South China

doi:10.1016/j.jseaes.2014.09.024

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	Zircon U-Pb geochronology, geochemistry and tectonic implications of Triassic A-type granites from southeastern Zhejiang, South China
	Gao, Wanli 5; Wang, Zongxiu ; Song, Wanjiao 1; Wang, Duixing 2,3; Li, Chunlin
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2014
卷号	96 页码:255-268
关键词	Southeastern Zhejiang Triassic granites LA-MC-ICPMS
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2014.09.024
英文摘要	The late Permian-Triassic granites in southeastern China have important tectonic significance for the evolution of East Asia. A detailed study utilizing zircon U-Pb dating, major and trace element geochemistry, and zircon Hf isotope geochemistry for Dashuang and Jingju granites in Zhejiang Province, South China was performed. LA-ICP-MS zircon U-Pb analyses yielded ages of quartz-monzonite and monzogranite that are 234 +/- 3 Ma and 231 +/- 3 Ma, respectively, from the Dashuang pluton, while the LA-ICP-MS zircon U-Pb ages of monzogranite and K-feldspar granite from the Jingju pluton are 246 2 Ma and 241 3 Ma, respectively. These ages indicate that the magmatism event took place during the early Triassic to Mid-Triassic. The two granites have high contents of total alkalis (Na2O + K2O = 7.73-10.24%), high-field-strength elements (e.g., Zr = 215-471 ppm, Y = 25.8-36.5 ppm, Nb = 15-28 ppm, and Zr + Nb + Ce + Y = 293-849 ppm) and rare earth elements (total REE = 299-701 ppm), as well as high Ga/Al ratios (10,000 x Ga/Al = 2.44-2.9). The zircon saturation temperatures were 800-837 degrees C for the two granites, which suggests that they have the petrographic and geochemical characteristics of A-type granites. In-situ Hf isotopic analyses revealed that the two granites have epsilon(Hf)(t) values ranging from -20 to -6 and two-stage depleted mantle Hf model ages from 1.6 Ga to 2.6 Ga, which indicate that the two granite magmas were formed by the partial melting of Paleoproterozoic crust rocks in the Cathaysia Block. A series of A-type granites distributed in the coastal region probably defines an extensional environment in the early Triassic. (C) 2014 Elsevier Ltd. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	FLAT-SLAB SUBDUCTION ; PALEO-PACIFIC PLATE ; IN-SITU ANALYSIS ; LA-ICP-MS ; HUNAN PROVINCE ; HF ISOTOPE ; SE CHINA ; INTRACONTINENTAL OROGEN ; SOUTHWESTERN ZHEJIANG ; CRUSTAL EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000347023300020
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41046]
专题	中国地质科学院地质力学研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Key Lab Shale Oil & Gas Geol Survey, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, Lab Digital Earth, Beijing 100094, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 4.Shijiazhuang Univ Econ, Sch Resources, Shijiazhuang 050031, Peoples R China 5.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Gao, Wanli,Wang, Zongxiu,Song, Wanjiao,et al. Zircon U-Pb geochronology, geochemistry and tectonic implications of Triassic A-type granites from southeastern Zhejiang, South China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,96:255-268.
APA	Gao, Wanli,Wang, Zongxiu,Song, Wanjiao,Wang, Duixing,&Li, Chunlin.(2014).Zircon U-Pb geochronology, geochemistry and tectonic implications of Triassic A-type granites from southeastern Zhejiang, South China.JOURNAL OF ASIAN EARTH SCIENCES,96,255-268.
MLA	Gao, Wanli,et al."Zircon U-Pb geochronology, geochemistry and tectonic implications of Triassic A-type granites from southeastern Zhejiang, South China".JOURNAL OF ASIAN EARTH SCIENCES 96(2014):255-268.