Crustally derived granites in Dali, SW China: new constraints on silicic   magmatism of the Central Emeishan Large Igneous Province

doi:10.1007/s00531-016-1444-7

CORC > 北京大学 > 地球与空间科学学院

	Crustally derived granites in Dali, SW China: new constraints on silicic magmatism of the Central Emeishan Large Igneous Province
	Zhu, Bei ; Peate, David W. ; Guo, Zhaojie ; Liu, Runchao ; Du, Wei
刊名	INTERNATIONAL JOURNAL OF EARTH SCIENCES
	2017
关键词	Emeishan Large Igneous Province Dali Granite Crustal melting ZIRCON U-PB PLUME-LITHOSPHERE INTERACTION NEOPROTEROZOIC TECTONIC EVOLUTION IONIZATION MASS-SPECTROMETRY PERMIAN-TRIASSIC BOUNDARY WESTERN YANGTZE BLOCK SOUTH CHINA MANTLE PLUME FLOOD BASALTS SICHUAN PROVINCE
DOI	10.1007/s00531-016-1444-7
英文摘要	We have identified a new crustally derived granite pluton that is related to the Emeishan Large Igneous Province (ELIP). This pluton (the Wase pluton, near Dali) shows two distinct SHRIMP zircon U-Pb age groups (similar to 768 and similar to 253 Ma). As it has an intrusive relationship with Devonian limestone, the younger age is interpreted as its formation, which is related to the ELIP event, whereas the similar to 768 Ma Neoproterozoic-aged zircons were inherited from Precambrian crustal component of the Yangtze Block, implying the pluton has a crustally derived origin. This is consistent with its peraluminous nature, negative Nb-Ta anomaly, enrichment in light rare earth elements, high Sr-87/Sr-86((i)) ratio (0.7159-0.7183) and extremely negative epsilon(Nd)((i)) values (-12.15 to -13.70), indicative of melts derived from upper crust materials. The Wase pluton-intruded Devonian strata lie stratigraphically below the Shangcang ELIP sequence, which is the thickest volcanic sequence (similar to 5400 m) in the whole ELIP. The uppermost level of the Shangcang sequence contains laterally restricted rhyolite. Although the rhyolite has the same age as the Wase pluton, its geochemical features demonstrate a different magma origin. The rhyolite displays moderate Sr-87/Sr-86((i)) (0.7053), slightly negative epsilon(Nd)((i)) (-0.18) and depletions in Ba, Cs, Eu and Sr, implying derivation from differentiation of a mantle-derived mafic magma source. The coexistence of crustally and mantle-derived felsic systems, along with the robust development of dike swarms, vent proximal volcanics and thickest flood basalts piles in Dali, shows that the Dali area was probably where the most active Emeishan magmatism had once existed.; Natural Science Foundation of China [41572199]; Young Scholars Development Fund of Southwest Petroleum University [201699010090]; SCI(E); ARTICLE; 7; 2503-2525; 106
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470566]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhu, Bei,Peate, David W.,Guo, Zhaojie,et al. Crustally derived granites in Dali, SW China: new constraints on silicic magmatism of the Central Emeishan Large Igneous Province[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2017.
APA	Zhu, Bei,Peate, David W.,Guo, Zhaojie,Liu, Runchao,&Du, Wei.(2017).Crustally derived granites in Dali, SW China: new constraints on silicic magmatism of the Central Emeishan Large Igneous Province.INTERNATIONAL JOURNAL OF EARTH SCIENCES.
MLA	Zhu, Bei,et al."Crustally derived granites in Dali, SW China: new constraints on silicic magmatism of the Central Emeishan Large Igneous Province".INTERNATIONAL JOURNAL OF EARTH SCIENCES (2017).