南京蒋庙岩体的年代学

地球化学及其地质意义

Translated title of the contribution: Geochronology and geochemistry of the Jiangmiao intrusion in Nanjing: its geological significance

Wen Tao Hong*, Xi Sheng Xu, Zhen Yu He, Jun Yan

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Jiangmiao intrusion is mainly composed of gabbro and diorite, and minority of monzonite. It belongs to the latest episode of Mesozoic magmatism in the Milddle-Lower Yangtze region, with its LA-ICP-MS zircon U-Pb age of 118 ± 1. 1Ma. There is no significant crustal contamination during magma ascending and crystallization by petrochemical analysis. The εNd(t) values of Jiangmiao intrusion range from -0. 49 to -2. 29, situated in the field between the DMM and EM II end-members in the εNd(t) vs. ( 87Sr/86Sr), diagram, and the simple binary mixing calculation indicates that its magma source contains a large proportion of materials from the depleted asthenosphere. Integration with previous age data, the Mesozoic magmatism in the Middle-Lower Yangtze region can be divided into three episodes ; Early (151 - 133Ma) , middle ( 131 - 126Ma) and late ( 125 - 118Ma) episodes. This region was under intraplate extensional environment in Mesozoic and experienced a series of processes of lithospheric extension and asthenosphere upwelling.

Original languageChinese
Pages (from-to)1577-1588
Number of pages12
JournalActa Petrologica Sinica
Volume26
Issue number5
Publication statusPublished - 2010
Externally publishedYes

Keywords

  • Asthenosphere upwelling
  • Gabbro-diorite
  • Middle-Lower yangtze region
  • Petrochemistry
  • Zircon U-Pb dating

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    Hong, W. T., Xu, X. S., He, Z. Y., & Yan, J. (2010). 南京蒋庙岩体的年代学: 地球化学及其地质意义. Acta Petrologica Sinica, 26(5), 1577-1588.