Zircon U-Pb dating and trace elements geochemistry of the Gaotan gabbro from Ziyang County, Shaanxi Province

Xie, Qiaoqin, Zhao, Yueling, Zhang, Huanxia, Chen, Tianhu, Xu, Xiaochun, Xue, Huaimin and Zhao, Jianxin (2014) Zircon U-Pb dating and trace elements geochemistry of the Gaotan gabbro from Ziyang County, Shaanxi Province. Chinese Journal of Geology, 49 2: 456-471. doi:10.3969/j.issn.0563-5020.2014.02.009

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Author Xie, Qiaoqin
Zhao, Yueling
Zhang, Huanxia
Chen, Tianhu
Xu, Xiaochun
Xue, Huaimin
Zhao, Jianxin
Title Zircon U-Pb dating and trace elements geochemistry of the Gaotan gabbro from Ziyang County, Shaanxi Province
Journal name Chinese Journal of Geology
ISSN 0563-5020
Publication date 2014
Sub-type Article (original research)
DOI 10.3969/j.issn.0563-5020.2014.02.009
Open Access Status
Volume 49
Issue 2
Start page 456
End page 471
Total pages 16
Place of publication Beijing China
Publisher Chinese Academy of Sciences, Institute of Geology and Geophysics
Collection year 2015
Language chi
eng
Formatted abstract
Basic dike swarms are widely distributed in the Ziyang-Langao-Zhenping area of Ankang in Shaanxi Province and Zhuxi area in Hubei Province, intruding the Early Paleozoic strata which characterized by bimodal volcanic association. The gabbro dikes emplacement dated 410±5 Ma by the LA-ICP-MS zircon U-Pb dating. They show the patterns of enriched LREE with high fractionation of light and heavy REE, and enrichment of incompatible elements in the primitive mantle-normalized spider-diagrams with peaks of Ba, Nb and Ti and valleys of Pb and U. The ratios of Th/Nb is less than 0.11 and those of Nb/Zr more than 0.15, indicating that they were derived from enriched mantle source closely related to the plume. The ratios of Nb/U, Ce/Pb and concentration of U, Th, Pb and Ni in the gabbro dikes indicate that the pyroxenes and olivines were main fractional minerals in the fractional crystallization during the magma evolution, and they were not affected by contamination of continental crust from the mantle to crust. These helps to infer that the extensional tectonics developed constrainedly in the Early Paleozoic by the mantle plume activities that happened at the boundary of paleocontinent on the northern margin of Yangtze Plate, thus producing the large group of basic dike swarms in these areas. The deep thermodynamic condition is responsible for the crustal extension and end. Thus the age of 410±4.5 Ma not only represents the magma emplacement, but also the extension evolution history of this continent crust rift from beginning to end in Silurian.
Keyword Continental rifting
Gabbro
Northtern margin of the Yangtze Plate
Zircon U-Pb LA-ICP-MS dating
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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