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Zircon U-Pb Age and Tectonic Setting of Meta-Basalts of Liaohe Group in Helan Area, Liaoyang, Liaoning Province

WANG Hui-chu1, LU Song-nian1, CHU Hang1, XIANG Zhen-qun1, ZHANG Chang-jie2, LIU Huan1   

  1. 1.Tianjin Center, China Geological Survey, Tianjin300170, China;
    2.Shenyang Center, China Geological Survey, Shenyang110034, China
  • Received:2011-05-05 Online:2011-09-26 Published:2011-09-26

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Abstract:

A lot of meta-basalts and mafic dykes occurred in the Northern Liaohe Group in Haicheng-Caohekou area, among which, the meta-basalts of Dashiqiao Formation in south Helan, Liaoyang, preserved a good pillow structure. The meta-pillow lava is chemically characterized by low alkaline, low K2O/Na2O ratios and iron-rich, which suggest that it belongs to island-arc tholeiite series. The REE and trace element characteristics indicate that the meta-pillow lava formed in the tectonic setting associated with the island-arc, likely back-arc basin rather than the continental rift. The study of isotopic chronology show that zircon SHRIMP U-Pb age of the meta-pillow lava is (1 869±28) Ma, of meta-diabase dyke is (1 828±13) Ma with a group of ~2 080 Ma captured zircon ages, and the zircon LA-ICP-MS U-Pb age of granite pegmatite is (1 869.7±7.6) Ma. Based on their occurrence, zircon dating and previous research data, it is suggested that the meta-pillow lava is formed at ~1880 Ma which could represent the forming age of Dashiqiao Formation, and the granite pegmatite is at ~1860 Ma which can be considered as a marker of the end of orogeny, and the meta-diabase dyke at ~1830 Ma which may indicates the beginning of post-orogeny extension.

Key words: Liao-Ji mobile belt, Liaohe Group, pillow lava, Zircon U-Pb dating, tectonic setting, tectonics, Liaoyang

CLC Number: 

  • P597.1
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