Geochemistry of Altungol cap dolostones from the Tarim Basin, NW China

doi:10.1007/s12517-016-2734-x

CORC > 北京大学 > 地球与空间科学学院

	Geochemistry of Altungol cap dolostones from the Tarim Basin, NW China
	Feng, Fan ; Guan, Ping ; Liu, Wenhui ; Zhang, Wei ; Liu, Peixian ; Jian, Xing ; Fu, Ling
刊名	ARABIAN JOURNAL OF GEOSCIENCES
	2016
关键词	Snowball Earth delta C-13 Sr-87/Sr-86 Acid-insoluble residua Tarim EARTH-ELEMENT GEOCHEMISTRY ND ISOTOPIC VARIATIONS SNOWBALL EARTH NEOPROTEROZOIC GLACIATION AGE CONSTRAINTS CAMBRIAN CARBONATES CRUSTAL EVOLUTION SHALLOW SEAWATER SOUTH-AUSTRALIA SULFUR ISOTOPES
DOI	10.1007/s12517-016-2734-x
英文摘要	The Snowball Earth hypothesis postulates that the whole earth was covered by ice sheets for millions of years in the Neoproterozoic. In Tarim Basin, there are four intervals of glacial deposits recorded in the Quruqtagh area during the Neoproterozoic. In chronological order, they are Bayisi, Altungol, Tereeken, and Hankalchough glaciations. In this study, we analyzed carbon, oxygen, and strontium isotopes; whole-rock geochemistry; and acid-insoluble residua of the similar to 5-m-thick Altungol cap dolostone (ten samples) in Quruqtagh unit of the Tarim basin. The geochemical data of whole rock are used to explain the ocean environmental changes, while the geochemical data of acid-insoluble residua reflect the changes of the continental environment. The delta C-13(PDB) of cap dolostone varies from -2.5 to -1 %, which is likely due to the influence of organics. From the bottom to the top of the Altungol cap dolostones, the chemical index of alteration of acid-insoluble residua rises from 72 to 77, but the index of chemical variation drops from similar to 3 to similar to 1. Ni, Zn, Cu, and Y contents of acid-insoluble residua are enriched in 2.5 m. The values of iron maintain at a high level in all of the whole-rock samples (>5.15 %), but in the samples of acid-insoluble residua, the values of iron are higher than in the whole rock (19 similar to 60 %) below 1.5 m. The variations in chemical composition were probably associated with the changes of continental weathering. The geochemistry suggests that ocean and continent environmental variations had taken place after the Altungol glaciation, including the destruction of ocean stratification and the changes of chemical weathering. During this period, the source of this area had changed. At first, the weathering residues of the parent rocks were exhausted by meltwater. Then, the vigorous weathering of freshly exposed continental crust provided a new source.; Major National S&T Program of China [2011ZX05004-004-005]; (973) National Basic Research Program of China [2012CB214801]; SCI(E); ARTICLE; lzff1987@163.com; pguanl@pku.edu.cn; Whliu.syky@sinopec.com; zhangwei1863@pku.edu.cn; liupeixian6@163.com; xjian@pku.edu.cn; Fuling_peking@163.com; 18; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/458515]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Feng, Fan,Guan, Ping,Liu, Wenhui,et al. Geochemistry of Altungol cap dolostones from the Tarim Basin, NW China[J]. ARABIAN JOURNAL OF GEOSCIENCES,2016.
APA	Feng, Fan.,Guan, Ping.,Liu, Wenhui.,Zhang, Wei.,Liu, Peixian.,...&Fu, Ling.(2016).Geochemistry of Altungol cap dolostones from the Tarim Basin, NW China.ARABIAN JOURNAL OF GEOSCIENCES.
MLA	Feng, Fan,et al."Geochemistry of Altungol cap dolostones from the Tarim Basin, NW China".ARABIAN JOURNAL OF GEOSCIENCES (2016).