Volume 44 Issue 10
Nov.  2019
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Zhao Yan, Kou Linlin, Zhang Peng, Bi Zhongwei, Li Dongtao, Chen Cong, 2019. Characteristics of Geochemistry and Hf Isotope from Meta-Gabbro in Longchang Area, Liaodong Peninsula: Implications on Evolution of the Jiao-Liao-Ji Paleoproterozoic Orogenic Belt. Earth Science, 44(10): 3333-3345. doi: 10.3799/dqkx.2019.185
Citation: Zhao Yan, Kou Linlin, Zhang Peng, Bi Zhongwei, Li Dongtao, Chen Cong, 2019. Characteristics of Geochemistry and Hf Isotope from Meta-Gabbro in Longchang Area, Liaodong Peninsula: Implications on Evolution of the Jiao-Liao-Ji Paleoproterozoic Orogenic Belt. Earth Science, 44(10): 3333-3345. doi: 10.3799/dqkx.2019.185

Characteristics of Geochemistry and Hf Isotope from Meta-Gabbro in Longchang Area, Liaodong Peninsula: Implications on Evolution of the Jiao-Liao-Ji Paleoproterozoic Orogenic Belt

doi: 10.3799/dqkx.2019.185
  • Received Date: 2019-07-29
  • Publish Date: 2019-11-11
  • The meta-gabbro, distributed in the Longchang area, eastern part of the North China craton, yields a zircon U-Pb age of 2 113±15 Ma by LA-ICP-MS. Detailed geochemistry analyses, whole rock Nd isotope and zircon U-Pb and in-situ Hf isotope analyses were made to confine tectonic settings of the Jiao-Liao-Ji orogenic belt and other crucial problems. The gabbro samples studied show calc-alkaline to high potassic alkaline series features with weak alteration and also low content of TiO2(< 1.31%), moderate content of MgO (6.88%-7.62%), FeOT(11.91%-14.25%) and K2O (0.85%-1.23%). The studied samples are characterized with low REE content and show weak REE fractionation and depletion in high field strength elements like P and Hf. The samples also show enrichment in large ion lithophile elements like Rb, Ba and K, and enrichment in Nd isotope content, with εNd(t) values of -1.6 to 2.6. (176Hf/177Hf)i of zircon from the meta-gabbro samples ranging from 0.281 497 to 0.281 612, and the calculated εHf(t) values ranging from 2.2 to 6.3. The calculated Hf modal ages are 2.25 to 2.33 Ga. Several crucial diagrams from meta-gabbro sample analysis results show far distance from MORB or OIB both of which are typical basalts distributed in a rift geological setting. E-MORB with continental crust component mixed in may be the exact origin of the meta-basalts in the Longchang area. It can be concluded that there was ocean crust subduction in~2.1 Ga within the Jiao-Liao-Ji orogenic belt, with possible paleo-arc and the evolution model of the Jiao-Liao-Ji orogenic belt is more like an arc-continental collision model.

     

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