Petrogenesis of high-K, calc-alkaline and shoshonitic intrusive rocks in the Tongling area, Anhui Province (eastern China), and their tectonic implications

doi:10.1130/B30613.1

	Petrogenesis of high-K, calc-alkaline and shoshonitic intrusive rocks in the Tongling area, Anhui Province (eastern China), and their tectonic implications
	Wu, Cailai 4; Dong, Shuwen 1; Robinson, Paul T.; Frost, B. Ronald ; Gao, Yuanhong ; Lei, Min ; Chen, Qilong ; Qin, Haipeng
刊名	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
	2014
卷号	126 期号:42006 页码:78-102
ISSN号	0016-7606
DOI	10.1130/B30613.1
英文摘要	The Mesozoic intermediate-silicic intrusive rocks in the Tongling area, Anhui Province, eastern China, include a high-K, calc-alkaline series and a shoshonitic series. Rocks of the calc-alkaline series comprise more than 90% of the total and consist chiefly of gabbro-diorite, granodiorite, quartz monzodiorite, and porphyritic quartz monzodiorite. These rocks are associated with important skarn-type copper-iron deposits. They contain three types of enclaves: mica-rich varieties that appear to be residues of partially melted pelitic rock, mafic quartz monzodiorite, and microdiorite. The shoshonitic series consists of pyroxene monzodiorite, monzonite, and quartz monzonite, which are commonly associated with skarn-type gold deposits. Enclaves in these rocks are typically pyroxene-rich or amphibole-rich varieties or amphibole gabbros. Zircon sensitive high-resolution ion micro probe (SHRIMP) U-Pb age data suggest that the granodiorites, quartz monzodiorites, and gabbro-diorites of the calc-alkaline series were generated at ca. 146-142, 143, and 140 Ma, respectively. The shoshonitic rocks range in age from 143 to 136 Ma. Although there is some overlap in reported ages of the two series, contact relations indicate that the shoshonitic rocks post-date the calc-alkaline varieties. On the basis of the geochemistry of the two series and the character of their enclaves, the shoshonitic series is thought to have formed primarily by differentiation of a mantle-derived, weakly contaminated, alkali basalt magma, whereas the high-K, calc-alkaline series reflects mixing of differentiated mantle and crustal melts, followed by assimilation-fraction crystallization (AFC) processes. The magmatic activity may have been related to reactivation of the Tongling-Deijiahui structural zone in response to rapid, highly oblique subduction of the paleo-Pacifi c plate beneath South China.
学科主题	火成岩岩石学
WOS关键词	SHIZISHAN ORE-FIELD ; GEOCHEMICAL CLASSIFICATION ; MAGMATIC PROCESSES ; ISOTOPIC EVIDENCE ; VOLCANIC-ROCKS ; SILICIC MAGMA ; FE-AU ; ZIRCON ; SHRIMP ; PB
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMER, INC
WOS记录号	WOS:000336259500009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40579]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, State Key Lab Continental Tecton & Dynam, Inst Geol, Beijing 100037, Peoples R China 2.CAGS, Beijing 100037, Peoples R China 3.Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82072 USA 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Wu, Cailai,Dong, Shuwen,Robinson, Paul T.,et al. Petrogenesis of high-K, calc-alkaline and shoshonitic intrusive rocks in the Tongling area, Anhui Province (eastern China), and their tectonic implications[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2014,126(42006):78-102.
APA	Wu, Cailai.,Dong, Shuwen.,Robinson, Paul T..,Frost, B. Ronald.,Gao, Yuanhong.,...&Qin, Haipeng.(2014).Petrogenesis of high-K, calc-alkaline and shoshonitic intrusive rocks in the Tongling area, Anhui Province (eastern China), and their tectonic implications.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,126(42006),78-102.
MLA	Wu, Cailai,et al."Petrogenesis of high-K, calc-alkaline and shoshonitic intrusive rocks in the Tongling area, Anhui Province (eastern China), and their tectonic implications".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 126.42006(2014):78-102.