Late Paleozoic rift-related basalts from central Inner Mongolia, China

doi:10.1016/j.jseaes.2017.04.007

CORC > 北京大学 > 地球与空间科学学院

	Late Paleozoic rift-related basalts from central Inner Mongolia, China
	Zhu, Wenping ; Tian, Wei ; Wei, Chunjing ; Shao, Ji-an ; Fu, Bin ; Fanning, C. Mark ; Chen, Mimi ; Wang, Bin
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2017
关键词	Central Asia Orogenic Belt Inner Mongolia Late Carboniferous Early Permian Basalt Rift ASIAN OROGENIC BELT ZIRCON U-PB PERALKALINE GRANITOID MAGMATISM TECTONIC IMPLICATIONS SUBDUCTION INITIATION CONTINENTAL GROWTH NORTH CHINA FRACTIONAL CRYSTALLIZATION FLOOD-BASALT MANTLE
DOI	10.1016/j.jseaes.2017.04.007
英文摘要	Late Paleozoic basaltic volcanism widely occurred in central Inner Mongolia, the southeastern part of the Central Asia Orogenic Blet (CAOB). Three volcanic pulses are identified by ion microprobe (SHRIMP II) zircon U-Pb analysis, which are Late Carboniferous (ca. 315 Ma), the latest Carboniferous (ca. 303 Ma) and early Permian (ca. 284 Ma). Basalts in the earliest stage are characterized by flat HREE, depletion in Nb and Ta, MORB-like Th/Yb ratios and depleted mantle (DM)-like Hf isotopic ratios. These are similar to forearc basalts, that have been generated by melting of a fluxed depleted mantle in an extensional environment. The latest Carboniferous basalts (sample D1363) have no Zr-Hf anomalies, relatively radiogenic Hf isotopic ratios (epsilon Hf(t) = +12.1 to +19.7) and high 8180 values up to 8.5 parts per thousand, VSMOW. These are likely to be magmas originated from decompressional melting of a depleted mantle that interacted with ocean floor pillow basalts during their ascending through the crust. The early Permian sample D1380 have variable Pb-206/U-238 zircon ages with an interpreted magma crystallization age of 284.4 +/- 2.5 Ma. These zircons have scattered Hf isotope (epsilon Hf(t) = +5 to +14) and delta O-18 (1.8-11.0 parts per thousand, VSMOW), which suggest the involvement of a relatively enriched mantle source. Overall the temporal evolution of the Late Paleozoic basaltic volcanism from central Inner Mongolia suggests a rift-related tectonic setting.; 973 Project; National Basic Research Program of China [2013CB429801]; National Science Foundation of China (NSFC) [41172196]; SCI(E); ARTICLE; ,SI; 155-170; 144
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471481]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhu, Wenping,Tian, Wei,Wei, Chunjing,et al. Late Paleozoic rift-related basalts from central Inner Mongolia, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017.
APA	Zhu, Wenping.,Tian, Wei.,Wei, Chunjing.,Shao, Ji-an.,Fu, Bin.,...&Wang, Bin.(2017).Late Paleozoic rift-related basalts from central Inner Mongolia, China.JOURNAL OF ASIAN EARTH SCIENCES.
MLA	Zhu, Wenping,et al."Late Paleozoic rift-related basalts from central Inner Mongolia, China".JOURNAL OF ASIAN EARTH SCIENCES (2017).