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LA-ICP-MS zircon geochronology and platinum-group elements characteristics of the Triassic basalts, SW China: Implications. for post-Emeishan large igneous province magmatism
Jiawei Zhang; Zhilong Huang; Taiyi Luo; Zaifei Yan
Corresponding AuthorZhilong Huang
2014
Source PublicationJournal of Asian Earth Sciences
Volume87Issue:1Pages:69-78
Abstract

The Triassic post-Emeishan large igneous province (ELIP) basalts, mainly found in the Kaiyuan (KY), Qilinshan (QLS), and Laochang-Kafang (LK) areas, show spatial and geochemical relationships with the Permian ELIP, SW China. Specifically, the post-ELIP basalts are located in the southern part of the intermediate zone of the ELIP. These basalts have major trace element and Sr-Nd isotope features that are similar to those of Permian Emeishan high-Ti basalts. The LA-ICP-MS zircon U-Pb age and whole-rock platinum-group elements (PGE) concentrations of the post-ELIP basalts are reported in this paper. The determined age of 247.7 +/- 1.4 Ma for the KY volcanic rocks is almost 10 Ma younger than the termination age of the ELIP magmatism, supporting their origin from post-ELIP magmatism. All the post-ELIP basalts show uniform but significant low PGE contents. Ir and Ru are depleted relative to Rh, Pt, and Pd in the primitive mantle-normalized PGE patterns, suggesting that a low degree of partial melting of the mantle source plays an important role in the PGE characteristics of the post-ELIP basalts. The Ir and Ru contents of the post-ELIP basalts are similar to those of the Emeishan high-Ti basalts. However, the Pt and Pd contents are strikingly depleted. This is consistent with the notion of early extraction of palladium-group PGE during the eruption of the Emeishan basalts.

KeywordPlatinum-group Elements Geochronology Low-degree Partial Melting Basalts Emeishan Large Igneous Province Sw China
Subject Area矿床地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/5206
Collection矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
Corresponding AuthorZhilong Huang
Recommended Citation
GB/T 7714
Jiawei Zhang,Zhilong Huang,Taiyi Luo,et al. LA-ICP-MS zircon geochronology and platinum-group elements characteristics of the Triassic basalts, SW China: Implications. for post-Emeishan large igneous province magmatism[J]. Journal of Asian Earth Sciences,2014,87(1):69-78.
APA Jiawei Zhang,Zhilong Huang,Taiyi Luo,&Zaifei Yan.(2014).LA-ICP-MS zircon geochronology and platinum-group elements characteristics of the Triassic basalts, SW China: Implications. for post-Emeishan large igneous province magmatism.Journal of Asian Earth Sciences,87(1),69-78.
MLA Jiawei Zhang,et al."LA-ICP-MS zircon geochronology and platinum-group elements characteristics of the Triassic basalts, SW China: Implications. for post-Emeishan large igneous province magmatism".Journal of Asian Earth Sciences 87.1(2014):69-78.
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