Geochronology, geochemistry and geological significance of Late Triassic magmatism in Qingchengzi orefield, Liaoning.

	Geochronology, geochemistry and geological significance of Late Triassic magmatism in Qingchengzi orefield, Liaoning.
	Duan XiaoXia 1,2; Liu JianMing 1; Wang YongBin 1,2; Zhou LingLi 1,2; Li YongGui 3; Li Bin 3; Zhang Zhuang 1,2; Zhang ZuoLun 4
刊名	ACTA PETROLOGICA SINICA
	2012-02-01
卷号	28 期号:2 页码:595-606
关键词	Zircon U-Pb dating Adakitic intrusions Syn-collisional granite Qingchengzi orefield, Liaoning
ISSN号	1000-0569
文献子类	Article
英文摘要	The Qingchengzi orefield which lies in geotectogene of Liaodong rift is an important polymetallic mineral district in northern China for its clustering several large Pb-Zn, Ag and Au deposits. A phase of Late Triassic magmatism, represented by Shuangdinggou biotite monzogranite and Xinling granite, is intimately related to polymetallic mineralization. LA-ICPMS zircon U-Pb age of 224.2 +/- 1. 2Ma was obtained for the Shuangdinggou intrusion. Geochemical data for the Shuangdinggou intrusion reveal SiO2 content of 69. 07% similar to 71. 31%, while K2O accounts for 3. 53% similar to 5. 22% and Na2O for 3. 87% similar to 4. 14%, indicating it belongs to high K calc-alkaline series. Al2O3 content ranges between 12. 46% similar to 14. 48% and A/CNK <1 suggest metaluminous feature. Trace element geochemistry of the biotite monzogranite displays high total REE content and demonstrate strong fractionation between light and heavy REE elements [(La/Yb)(N) = 35.43 similar to 79. 01, LREE/HREE = 23.09 similar to 35. 10] and minor negative Eu anomalies (delta Eu = 0.68 similar to 0. 97). The biotite monzogranite also shows LILE (such as Rb, Th, K, Pb) enrichment and HFSE (including Nb, Ta, P, Ti) depletion, with unusual high Ba and Sr, low Y and Yb abundances manefesting adakitic geochemical signature. Based on above-stated petrological and geochemical data it is inferred that the biotite monzogranitic magma might be derived from the partial melting of a thickened lower crust with prominent garnet and rutile retained in the residual assemblages, and magma mixing is probably involved based on the unusually high Nb/Ta ratio (18.4 similar to 21.2). It is suggested that slab break-off during the process of Yangtze Craton and North China Craton continental deep subduction in Late Triassic may be responsible for the ore-related magmatism.
WOS关键词	NORTH CHINA CRATON ; U-PB ; EASTERN CHINA ; SUBDUCTED LITHOSPHERE ; ZIRCON GEOCHRONOLOGY ; LIAODONG PENINSULA ; CONTINENTAL-CRUST ; PORPHYRY COPPER ; FLAT-SLAB ; PETROGENESIS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000301991500019
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84402]
专题	中国科学院地质与地球物理研究所
通讯作者	Duan XiaoXia
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Dandong Qingchengzi Min Co LTD, Dandong 118107, Peoples R China 4.China Railway Resources Explorat Co, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Duan XiaoXia,Liu JianMing,Wang YongBin,et al. Geochronology, geochemistry and geological significance of Late Triassic magmatism in Qingchengzi orefield, Liaoning.[J]. ACTA PETROLOGICA SINICA,2012,28(2):595-606.
APA	Duan XiaoXia.,Liu JianMing.,Wang YongBin.,Zhou LingLi.,Li YongGui.,...&Zhang ZuoLun.(2012).Geochronology, geochemistry and geological significance of Late Triassic magmatism in Qingchengzi orefield, Liaoning..ACTA PETROLOGICA SINICA,28(2),595-606.
MLA	Duan XiaoXia,et al."Geochronology, geochemistry and geological significance of Late Triassic magmatism in Qingchengzi orefield, Liaoning.".ACTA PETROLOGICA SINICA 28.2(2012):595-606.