干旱区生态环境知识资源中心(Arid): Sedimentary provenance and age of the Langshan Group in the northeastern Alxa Block: implications for Neoproterozoic tectonic evolution

Arid

DOI	10.1007/s00531-019-01731-9
	Sedimentary provenance and age of the Langshan Group in the northeastern Alxa Block: implications for Neoproterozoic tectonic evolution
	Tian, Rongsong 1; Xie, Guoai 1; Zhang, Jin 2; Zhu, Wenbin 1; Qu, Junfeng 2; Gao, Shuang 1
通讯作者	Xie, Guoai
来源期刊	INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN	1437-3254
EISSN	1437-3262
出版年	2019
卷号	108 期号:5 页码:1705-1723
英文摘要	The origin and the Precambrian tectonic evolution of the Alxa Block have not been well studied, largely due to widespread desert coverage and a lack of high-resolution geochronological data. This paper reports zircon U-Pb ages and Hf isotopic data for the Langshan Group in the northeastern Alxa Block. Detrital zircons from the Langshan Group mainly provide U-Pb ages between ca. 2000Ma and 1100Ma, suggesting that their provenance was dominated by late Palaeoproterozoic to Mesoproterozoic rocks, which yield two main peak ages at 1592Ma and 1745Ma. These zircons possess epsilon Hf (t) values between -15 and +8, implying the derivation of their precursor magmas from old crust and juvenile materials. Zircon U-Pb dating yields ages of 898 +/- 4Ma and 808 +/- 4Ma for the granite cobbles in coarse conglomerate in the Fourth Formation and the diorite intruding into the Second Formation of the Langshan Group, which constrains the depositional age of the main part of the Langshan Group to between 898 and 804Ma. Our data show that the Langshan Group was probably deposited in an intra-continental rift basin and originated from recycled orogens. The geochronology and palaeocurrent data indicate that the North China Craton (NCC) could not have provided source materials for the Langshan Group. Instead, the Langshan Group shares a similar origin and detrital zircon age spectrum with the Beishan Complex in the South Beishan Collage. Combining these findings with published data, we propose that the Alxa Block was not a part of the NCC during the Neoproterozoic but a Precambrian micro-continent block. The Alxa Block recorded footprints that are related to the late amalgamation of the Rodinia supercontinent and the initial breakup. We suggest that the Alxa Block laid between Australia and Laurentia in the Rodinia supercontinent during the Neoproterozoic.
英文关键词	North China Craton Alxa Block Langshan Group Neoproterozoic Rodinia supercontinent
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000474390800015
WOS关键词	NORTH CHINA CRATON ; ZIRCON U-PB ; PRECAMBRIAN CRUSTAL EVOLUTION ; PLASMA-MASS SPECTROMETRY ; HF ISOTOPIC COMPOSITIONS ; BEISHAN OROGENIC BELT ; DETRITAL ZIRCON ; PALEOPROTEROZOIC EVOLUTION ; KHONDALITE BELT ; HEXI CORRIDOR
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	南京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216406
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China; 2.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Tian, Rongsong,Xie, Guoai,Zhang, Jin,et al. Sedimentary provenance and age of the Langshan Group in the northeastern Alxa Block: implications for Neoproterozoic tectonic evolution[J]. 南京大学,2019,108(5):1705-1723.
APA	Tian, Rongsong,Xie, Guoai,Zhang, Jin,Zhu, Wenbin,Qu, Junfeng,&Gao, Shuang.(2019).Sedimentary provenance and age of the Langshan Group in the northeastern Alxa Block: implications for Neoproterozoic tectonic evolution.INTERNATIONAL JOURNAL OF EARTH SCIENCES,108(5),1705-1723.
MLA	Tian, Rongsong,et al."Sedimentary provenance and age of the Langshan Group in the northeastern Alxa Block: implications for Neoproterozoic tectonic evolution".INTERNATIONAL JOURNAL OF EARTH SCIENCES 108.5(2019):1705-1723.