The Early Jurassic magmatism in Northern Guangdong Province, Southeastern China

constraints from SHRIMP zircon U-Pb dating of Xialan complex

Xin Qi Yu*, Yong Jun Di, Gan Guo Wu, Da Zhang, Yong Zheng, Yan Pei Dai

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

This paper reports SHRIMP zircon U-Pb ages of 196±2 Ma for granite, and 195±1 Ma for gabbro from the Xialan complex in the Meizhou area, northern Guangdong Province. These results shed new light on the calm stage of magmatic activity in southeastern China during 200 - 180 Ma, and revealed that the back-arc extension induced by the subduction of the western Pacific plate may have begun at 195 Ma at least. Field observation on the fresh outcrops allows us to recognize some features formed by magma mixing. A part of the gabbro has a fine-grained rim of 20 - 30 cm at the margin, and thins gradually toward the granite; numerous dark fine-grained to microcrystalline dioritic enclaves developed in the granite. These enclaves vary in shape and size, dark minerals concentrated at the margin of enclaves, and the contact between enclaves and host rock is either obvious or obscure, or gradational. In addition, needle-shaped apatites are included in the enclaves. The REE patterns of gabbros, as well as the trace element patterns, are generally consistent with those of granitic rocks. The above characters further suggest that in the Early Jurassic the injection of basic magma had melted deep continental crust and produced acidic magma, and the Xialan complex was produced by the mixing of them.

Original languageEnglish
Pages (from-to)471-483
Number of pages13
JournalScience in China, Series D: Earth Sciences
Volume52
Issue number4
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Magma mixing
  • Meizhou
  • Northern Guangdong Province
  • SHRIMP zircon U-Pb ages
  • The Early Jurassic
  • Xialan complex

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