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2015, 34(1) 44-54 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Formation age and geochemical characteristics of volcanic rocks from Baiyingaolao Formation of middle Da Hinggan mountains |
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ZHANG Le-Tong, LI Shi-Chao, ZHAO Qing-Ying, LI Xue-Fei, WANG Lu, LI Zi-Hao |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
The volcanic rocks from Baiyingaolao Formation of Chaihe area in Da Hinggan mountains are com- posed of rhyolite and volcanic clastic��which is a set of felsic volcanic rocks�� SHI��MP U- - Pb dating shows that the age of the volcanic rocks of Baiyingaolao Formation is about 131 ±1 Ma��belonging to the Early Cretaceous�� The geochemical data show that the volcanic rocks belong to calc- alkaline series��the trace elements are characterized evidently by depletion of Ba��Sr��P��Ti��U��and enrichment of ��b��Th��K��Nd��Hf�� The ��EE distribution curves are to the right�� L��EE and H��EE fraction and Eu negative anomaly are both obvious�� Above characteristics indi- cate that the volcanic rocks are likely from lower crustal melting�� Tectonic setting of its formation may be the Mon- golia- - Okhotsk Ocean closure- stretch after collision orogeny�� |
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Keywords��
Da Hinggan mountains
Baiyingaolao Formation
volcanic rocks
geochemistry
source of magma
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