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2011, 30(4) 508-520 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Petrogenesis of bimodal volcanic rocks from Maoershan Formation in Zhangguangcai Range: evidence from geochronology and geochemistry |
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TANG Jie, HU Wen-Liang, WANG Feng, GAO Fu-Hong, CAO Hua-Hua |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
LA-ICP-MS zircon U-Pb dating and geochemical data of the volcanic rocks from Mesozoic Maoershan Formation in Zhangguangcai Range were obtained for to constraining their formation time and the regional tectonic background�� Zircons from two representative volcanic rocks are euhedral-subhedral in shape and display striped absorption or oscillatory zoning in CL images with high Th /U ratios ( 0. 40 ��2. 08) ��implying their magmatic origin�� The dating results indicate that the volcanic rocks from Maoershan Formation were formed in the Early Jurassic ( 179 ��184 Ma) which is older than the previously believed Late Jurassic�� The volcanic rocks from the Maoershan Formation display a bimodal volcanic rock association based on their petrographic and geochemical data�� The trachyte and trachyandesite are characterized by high alkali ( especially K2O) ��enrichment in large ion lithophile elements ( LILE) and light rare earth elements ( LREE) in contents��whereas the rhyolites are chemically similar to the A-type rhyolite�� The bimodal volcanic rock association in Lesser Xing'an Range and Zhangguangcai Range in the studied areas implies an intense extensional environment�� Combined with the spacial compositional variation ofthe Early Jurassic igneous rocks��it is suggested that the volcanic rocks from Maoershan Formation were formed under an extensional environment similar to back-arc basin which could be related to subduction of the Paleo-Pacific plate ( Izanagi) beneath the Eurasian continent�� |
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Keywords��
Zhangguangcai Range
Maoershan Formation
bimodal volcanic rocks
zircon U-Pb chronology
geochemistry
tectonic setting
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