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2016, 35(2) 348-356 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Ziron U-Pb geochronology and geochemistry of Xiaohu diorite porphyrite in Linjing��Jilin Province |
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YAN Lei-Lei, SUN Feng-Yue, MA Zhi-Tong, WANG Nai-Chen, ZHAO Chao, LI Fei-Da |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Exploration Geophysical ��esearch Institute of Jilin Province��Changchun 130012��China |
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Abstract��
LA-ICP-MS zircon U-Pb dating and geochemical data of Xiaohu diorite porphyrite were studied�� The results indicate that the diorite porphyrite pluton formed in Late Triassic (212. 8 ±1) Ma. Based on TiO 2 ��Zr/P2O5 ��P2O5��Zr��and K2O �� SiO2 diagrams of rocks��the diorite porphyrite is characterized by high- K calc- al- kaline and peraluminous affinities��with an A/CNK ratio ranging from 1. 25 to 1. 57��enrichment in LILE (such as K����b��Ba)��relatively depleting in HFSE (such as Nb��Ta��P��Ti)�� Combined with their high Mg # values (51. 74 ��52. 56)��Nb/Ta = 13. 52 �� 16. 00����b/Sr = 0. 13 �� 0. 18��Th/Nb = 0. 34 �� 0. 37��Ba/La = 12. 39 �� 15. 83��it can be concluded that the magmatic mixing evolution trend�� Integrated the regional tectonic evolution��it is suggested the porphyrite formed in the post- orogenic extension setting��which was related to the closure of the Pa- leo- - Asian Ocean�� |
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Keywords��
zircon U-Pb chronology
geochemistry
diorite porphyrite
Xiaohu of Linjinag
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