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Global Geology 2016, 19(3) 133-143 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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WANG Guozhi, LI Bile, PENG Bo, NING Chuanqi and YANG Wenlong |
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Songjianghe biotite monzonitic granite zircon U- Pb geochronology and geochemical significance |
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WANG Guozhi, LI Bile, PENG Bo, NING Chuanqi and YANG Wenlong |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract:
The authors studied geochronology and geochemical data of the Songjianghe biotite monzogranite in the southern Zhangguangcai ��ange in order to determine its formation age�� magma source��and tectonic environ- ment�� The results indicate that the Songjianghe biotite monzogranite was formed in the Middle Jurassic with an age of 168�� 2 ±2�� 0 Ma (MSWD =0�� 93)�� The monzogranite was characterized by high alkali and low CaO and MgO��belonging to high- potassium calc- alkaline��metaluminous I- type granite�� The rock is enriched in large ion lithophile elements such as ��b��Ba��and K and strongly depleted high field strength elements such as P��Ti�� Nb��and Ta�� It is concluded that the Songjianghe biotite monzogranite was derived from partial melting of am- phibolite facies metamorphism mafic lower- crust and its formation was controlled by the Pacific Plate subduc- tion�� |
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Keywords:
Songjianghe
biotite adamellite
geochemistry
zircon U- Pb age
Pacific Plate subduction
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