Petrogenesis and tectonic setting of Late Devonian high-Mg andesites in the Beishan orogen, NW China

doi:10.1017/S0016756821001151

	Petrogenesis and tectonic setting of Late Devonian high-Mg andesites in the Beishan orogen, NW China
	Wang, Guo-Qiang 2,3,4; Li, Xiang-Min 2,3,4; Yu, Ji-Yuan 2,3,4; Bu, Tao 3,4; Huang, Bo-Tao 4; Liu, Yu-Jie 1
刊名	GEOLOGICAL MAGAZINE
	2021-12-06
页码	16
关键词	high-Mg andesites geochemistry petrogenesis tectonic setting Late Devonian Beishan Central Asian Orogenic Belt
ISSN号	0016-7568
DOI	10.1017/S0016756821001151
通讯作者	Wang, Guo-Qiang(gqwangmint@gmail.com)
英文摘要	High-Mg andesites (HMAs) are crucial for the reconstruction of plate tectonics, continental margin formation and lithospheric evolution. In this study, we present new fossil age, whole-rock geochemical and Sr-Nd isotope data on the newly discovered Dundunshan Group HMAs in the Dundunshan area of the Beishan orogen (central-southern Central Asian Orogenic Belt). The Dundunshan HMA samples are characterized by high MgO (6.47-7.02 wt%) contents and high Mg-# values (67.27-68.77), with SiO2 (58.57-62.13 wt%), Al2O3 (14.49-16.07 wt%) and CaO (5.05-6.24 wt%) resembling typical HMAs. The Dundunshan HMA samples are calc-alkaline and strongly enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), with slightly negative Eu anomaly and high-field-strength element (HFSE) depletions. Their (Sr-87/Sr-86)(i) ratios (0.7041-0.7057) and epsilon(Nd(t)) (3.73-5.59) indicate that the Dundunshan HMAs were mainly formed by the interactions between subducted oceanic sediment-derived melts and mantle peridotites. Fossil evidence and published radiometric age data constrain the formation of the Dundunshan HMAs to early Late Devonian time. Sedimentological features of the Middle Devonian Sangejing Formation and regional tectonic correlation suggest that the Hongliuhe-Niujuanzi-Xichangjing Ocean in the Dundunshan area was likely closed during late Middle Devonian time, and that the Dundunshan HMAs were formed in a post-collision extensional setting.
资助项目	National Natural Science Foundation for Youth of China[41703038] ; Natural Science Foundation of Shaanxi Province[2015JM4144] ; China Geological Survey Project[DD20190812]
WOS关键词	SETOUCHI VOLCANIC BELT ; ZIRCON U-PB ; NIUJUANZI OPHIOLITIC MELANGE ; PHANEROZOIC CRUSTAL GROWTH ; SOUTHERN TIEN-SHAN ; SLAB-DERIVED MELTS ; A-TYPE GRANITES ; CENTRAL-ASIA ; POSTCOLLISIONAL MAGMATISM ; GEOCHEMICAL EVIDENCE
WOS研究方向	Geology
语种	英语
出版者	CAMBRIDGE UNIV PRESS
WOS记录号	WOS:000727554400001
资助机构	National Natural Science Foundation for Youth of China ; Natural Science Foundation of Shaanxi Province ; China Geological Survey Project
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/17281]
专题	地球环境研究所_科技外事处
通讯作者	Wang, Guo-Qiang
作者单位	1.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China 2.Northwest China Ctr Geosci Innovat, Xian 710054, Shaanxi, Peoples R China 3.China Geol Survey, Ctr Orogen Belt Geol, Xian 710054, Shaanxi, Peoples R China 4.China Geol Survey, Xian Ctr, Xian 710054, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Wang, Guo-Qiang,Li, Xiang-Min,Yu, Ji-Yuan,et al. Petrogenesis and tectonic setting of Late Devonian high-Mg andesites in the Beishan orogen, NW China[J]. GEOLOGICAL MAGAZINE,2021:16.
APA	Wang, Guo-Qiang,Li, Xiang-Min,Yu, Ji-Yuan,Bu, Tao,Huang, Bo-Tao,&Liu, Yu-Jie.(2021).Petrogenesis and tectonic setting of Late Devonian high-Mg andesites in the Beishan orogen, NW China.GEOLOGICAL MAGAZINE,16.
MLA	Wang, Guo-Qiang,et al."Petrogenesis and tectonic setting of Late Devonian high-Mg andesites in the Beishan orogen, NW China".GEOLOGICAL MAGAZINE (2021):16.