The Tarim picrite-basalt-rhyolite suite, a Permian flood basalt from   northwest China with contrasting rhyolites produced by fractional   crystallization and anatexis

doi:10.1007/s00410-009-0485-3

CORC > 北京大学 > 地球与空间科学学院

	The Tarim picrite-basalt-rhyolite suite, a Permian flood basalt from northwest China with contrasting rhyolites produced by fractional crystallization and anatexis
	Tian, Wei ; Campbell, Ian H. ; Allen, Charlotte M. ; Guan, Ping ; Pan, Wenqing ; Chen, Mimi ; Yu, Hongjiao ; Zhu, Wenping
刊名	contributions to mineralogy and petrology
	2010
关键词	Picrite Basalt Rhyolite Tarim Permian Large Igneous Province (LIP) Flood basalt Mantle plume LARGE IGNEOUS PROVINCE MANTLE PLUME DEPLETED MANTLE VOLCANIC-ROCKS TRACE-ELEMENT ICP-MS BASIN GEOCHEMISTRY GEOCHRONOLOGY MAGMATISM
DOI	10.1007/s00410-009-0485-3
英文摘要	We report major and trace element composition, Sr-Nd isotopic and seismological data for a picrite-basalt-rhyolite suite from the northern Tarim uplift (NTU), northwest China. The samples were recovered from 13 boreholes at depths between 5,166 and 6,333 m. The picritic samples have high MgO (14.5-16.8 wt%, volatiles included) enriched in incompatible element and have high (87)Sr/(86)Sr and low (143)Nd/(144)Nd isotopic ratios (epsilon Nd (t) = -5.3; Sr(i) = 0.707), resembling the Karoo high-Ti picrites. All the basaltic samples are enriched in TiO(2) (2.1-3.2 wt%, volatiles free), have high FeOt abundances (11.27-15.75 wt%, volatiles free), are enriched in incompatible elements and have high Sr and low Nd isotopic ratios (Sr(i) = 0.7049-0.7065; epsilon Nd (t) = -4.1 to -0.4). High Nb/La ratios (0.91-1.34) of basalts attest that they are mantle-derived magma with negligible crustal contamination. The rhyolite samples can be subdivided into two coeval groups with overlapping U-Pb zircon ages between 291 +/- 4 and 272 +/- 2 Ma. Group 1 rhyolites are enriched in Nb and Ta, have similar Nb/La, Nb/U, and Sr-Nd isotopic compositions to the associated basalts, implying that they are formed by fractional crystallization of the basalts. Group 2 rhyolites are depleted in Nb and Ta, have low Nb/La ratios, and have very high Sr and low Nd isotopic ratios, implying that crustal materials have been extensively, if not exclusively, involved in their source. The picrite-basalt-rhyolite suite from the NTU, together with Permian volcanic rocks from elsewhere Tarim basin, constitute a Large Igneous Province (LIP) that is characterized by large areal extent, rapid eruption, OIB-type chemical composition, and eruption of high temperature picritic magma. The Early Permian magmatism, which covered an area >300,000 km(2), is therefore named the Tarim Flood Basalt.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000280594900007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geochemistry & Geophysics; Mineralogy; SCI(E); 109; ARTICLE; 3; 407-425; 160
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155843]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Tian, Wei,Campbell, Ian H.,Allen, Charlotte M.,et al. The Tarim picrite-basalt-rhyolite suite, a Permian flood basalt from northwest China with contrasting rhyolites produced by fractional crystallization and anatexis[J]. contributions to mineralogy and petrology,2010.
APA	Tian, Wei.,Campbell, Ian H..,Allen, Charlotte M..,Guan, Ping.,Pan, Wenqing.,...&Zhu, Wenping.(2010).The Tarim picrite-basalt-rhyolite suite, a Permian flood basalt from northwest China with contrasting rhyolites produced by fractional crystallization and anatexis.contributions to mineralogy and petrology.
MLA	Tian, Wei,et al."The Tarim picrite-basalt-rhyolite suite, a Permian flood basalt from northwest China with contrasting rhyolites produced by fractional crystallization and anatexis".contributions to mineralogy and petrology (2010).