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2015, 34(2) 345-353 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Geochemical characteristics of monzonitic granite in Jiguanzi Mountain in Aohanqi��Inner Mongolia and its tectonic setting |
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ZHANG Jian-Ze, SUN Guo-Sheng, QU Yuan-Xin, SUN Zhen-Jun, SU Rong, LI Xiao-Peng, REN Li-Ming, WANG Gang |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. ��egional Geological and Mineral ��esources Survey of Jilin Province��Changchun 130022��China; 3. Department of Earthquake Science��Institute of Disaster Prevention Science and Technology��Beijing 101601��China; 4. Institute of Geophysical Exploration of Jilin Province��Changchun 130012��China |
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Abstract��
The result of LA-ICP-MS zircon U-Pb is 245 ±1 Ma��revealling that monzonitic granite in Jiguan- zi Mountain was formed in Early Triassic�� The geochemistry study of the rocks indicates that the rocks are charac- terized by high Si��K and low Ti��Ca��Fe��Mg�� The ratio of A/KNC ��1. 1 shows the characteristics of S- type gran- ite�� The SI is 1. 68 ��1. 88��DI is 93. 94 ��94. 25��indicating that the rocks experienced a relatively high degree of differentiation evolution�� The total content of ∑��EE is low (∑��EE =80. 10 ×10-6 ��145. 06 ×10-6 )��the L��EE and LILE (��b��K) are enriched�� the H��EE are depleted�� and it is also characterized by negative Eu anomaly�� In combination with discrimination diagram��the rocks belong to high- potassium��calc- alkaline peraluminous S- type granite�� Combining with related research��the authors infer that the monzonitic granite was syn- collisional granites caused by collided between North China and Siberia plates�� |
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Keywords��
Early Triassic
North China Plate
S-type granite
syn-collisional granite
Inner Mongolia
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