Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1418-1435.doi: 10.13278/j.cnki.jjuese.201505114

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Chronology, Geochemistry, Hafnium Isotope Characteristics and Tectonic Implications of Muztag-Kongur Indosinian Intrusive Rocks

Song Yue, Wang Jian, Liu Jinlin, Bao Zhenyan   

  1. College of Earth Sciences, Jinlin University, Changchun 130061, China
  • Received:2014-11-25 Published:2015-09-26

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Abstract:

Mazha-Kangxiwa suture zone (MKSZ), located to the south of the western Kunlun orogenic belt, is the location where Paleo-Tethys ocean finally closed. As the main peaks of Kunlun Mountain ranges, Muztag-Kongur granitoids closely distributed to the northeast of MKSZ and composed mainly of granodiorite and monzonitic granites. Based on the geochemical characteristics and U-Pb dating of Muztag-Kongur granitoids, we discussed the petrogenesis of granitoids and the evolution history of Paleo-Tethys ocean. The zircon LA-ICP-MS U-Pb dating results show that the forming ages of granodiorite and monzonitic granite are at (213.0±0.5)-(215.4±0.9) Ma and (220.6±0.5)-(222.1±0.4) Ma respectively, which is the result of Late Triassic magmatism activities. Muztag-Kongur granitoids contain high silicon (SiO2>65%) and total alkali (K2O+Na2O>6%), and are characterized by high K calc-alkaline and metaluminous (A/CNK< 1). They are enriched in LILE and LREE and depleted of HFSE and HREE. The contents of minor elements, low zircon saturation temperature, and high differentiation index suggest that Muztag-Kongur granitoids are highly fractionated I-type granites. The zircon Hf isotopic results show a narrow range of εHf(t)=-4.46--0.17, suggesting that the magmas originated mainly from lower crust. The comprehensive studies indicate that Muztag-Kongur granitoids formed likely in a syn-collisional orogenic setting where old lower crust melted partially under the heating of uprising mantle magmas. These felsic magmas intruded into crust level and formed Muztag-Kongur granitoids.

Key words: granite, geochemistry, zircon LA-ICP-MS age, Hf isotope, Paleo-Tethys ocean, Muztag-Kongur

CLC Number: 

  • P588.12

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