Origin of Early Cretaceous Guandian adakitic pluton in central eastern China: partial melting of delaminated lower continental crust triggered by ridge subduction

doi:10.1080/00206814.2017.1393777

	Origin of Early Cretaceous Guandian adakitic pluton in central eastern China: partial melting of delaminated lower continental crust triggered by ridge subduction
	Luo, Ze-Bin 1,2; Xue, Shuo 1,2,3; Zhang, Li-Peng 2,3; Li, He 4; Li, Cong-Ying 4; Zhang, Hong 5; Liu, Yu-Long 3; Ling, Ming-Xing 1,7; Sun, Weidong 4,6,7
刊名	INTERNATIONAL GEOLOGY REVIEW
	2018
卷号	60 期号:11-14 页码:1707-1720
关键词	Adakitic pluton Early Cretaceous lower Yangtze river belt (LYRB) southTan-Lu fault (STLF) ridge subduction delamination lower continental crust (LCC) oxygen fugacity
ISSN号	0020-6814
DOI	10.1080/00206814.2017.1393777
英文摘要	Early Cretaceous adakite or adakitic plutons are widely distributed in central eastern China, e.g. lower Yangtze river belt (LYRB), the south Tan-Lu fault (STLF), and the Dabie orogen. Their genesis, however, remains controversial. In this contribution, we present detailed geochemical and geochronological study on the Guandian pluton in central Anhui Province, eastern China, which has been formerly regarded as a part of the north belt in the LYRB and lately classified in the STLF. Namely, it is located near the boundary between ridge subduction related slab melting and partial melting of lower continental crust (LCC). The Guandian pluton consists of quartz monzonite and is metaluminous and high-K calc-alkaline according to the chemical composition. The samples show high SiO2 (59.15-62.32%), Al2O3 (14.51-15.39%), Sr (892-1184ppm), Sr/Y (56.74-86.32), and low Y (12.65-18.05ppm), similar to typical geochemical features of adakite. The Guandian adakitic rocks also exhibit high K2O (2.88-3.86%), MgO (3.89-5.24%), and Mg# (55-60), negative anomalies of high field strength elements (e.g. Nb, Ta, and Ti), and positive anomalies of Ba, Pb, and Sr. LA-ICP-MS zircon U-Pb dating yielded a weighted average age of 129.2 +/- 0.7Ma. Calculations of zircon Ce4+/Ce3+ (6.97-145) and (Eu/Eu*)(N) (0.23-0.42) on the basis of in situ zircon trace element analysis indicate that the magma had a lower oxygen fugacity relative to the ore-bearing adakites in the LYRB and Dexing, which is consistent with the fact of ore-barren in the research area. In combination with previous research, we propose that Guandian adakitic pluton was formed by partial melting of delaminated LCC triggered by Early Cretaceous ridge subduction of the Pacific and Izanagi plates. During ridge subduction, physical erosion destructed the thickened LCC and resulted in delamination, while thermal erosion facilitated partial melting of the delaminated LCC.
资助项目	National Key R&D Program of China[2016YFC0600408] ; Natural Science Foundation of China[41421062] ; Natural Science Foundation of China[41103006] ; Natural Science Foundation of China[41402064] ; Guangdong Natural Science Funds[2014A030306032] ; Guangdong Natural Science Funds[2015TQ01Z611] ; Youth Innovation Promotion Association: [CAS][2016315]
WOS关键词	PORPHYRY COPPER-DEPOSITS ; CU-AU MINERALIZATION ; YANGTZE-RIVER BELT ; MESOZOIC IGNEOUS ROCKS ; THICKENED LOWER CRUST ; HF-O ISOTOPES ; U-PB AGES ; SOUTH CHINA ; GEOCHEMICAL CONSTRAINTS ; METALLOGENIC BELT
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000443879500018
资助机构	National Key R&D Program of China ; Natural Science Foundation of China ; Guangdong Natural Science Funds ; Youth Innovation Promotion Association: [CAS]
内容类型	期刊论文
源URL	[http://ir.qibebt.ac.cn/handle/337004/11807]
专题	中国科学院青岛生物能源与过程研究所
通讯作者	Ling, Ming-Xing
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou, Guangdong, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China 5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Shaanxi, Peoples R China 6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 7.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Luo, Ze-Bin,Xue, Shuo,Zhang, Li-Peng,et al. Origin of Early Cretaceous Guandian adakitic pluton in central eastern China: partial melting of delaminated lower continental crust triggered by ridge subduction[J]. INTERNATIONAL GEOLOGY REVIEW,2018,60(11-14):1707-1720.
APA	Luo, Ze-Bin.,Xue, Shuo.,Zhang, Li-Peng.,Li, He.,Li, Cong-Ying.,...&Sun, Weidong.(2018).Origin of Early Cretaceous Guandian adakitic pluton in central eastern China: partial melting of delaminated lower continental crust triggered by ridge subduction.INTERNATIONAL GEOLOGY REVIEW,60(11-14),1707-1720.
MLA	Luo, Ze-Bin,et al."Origin of Early Cretaceous Guandian adakitic pluton in central eastern China: partial melting of delaminated lower continental crust triggered by ridge subduction".INTERNATIONAL GEOLOGY REVIEW 60.11-14(2018):1707-1720.