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2013, 32(3) 522-530 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Chronology and petrogenesis of volcanic rocks in Yingcheng Formation from Changling depression in Songliao Basin |
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LIU Wei-1, SUN De-You-1, LI Rui-Lei-2, LIU Man-Li-2, WEN Sheng-Fu-1, 2, ZHANG Xi-1, 2 |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. ��esearch Institute of Exploration and Development��Northeast Branch Corporation��Sinopec��Changchun 130062��China; 3. State Key Laboratory of Continental Dynamics��Northwest University��Xi'an 710069��China |
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Abstract��
The volcanic rocks of Yingcheng Formation in the Chaganhua block of Changling depression�� Songliao basin��formed in the Early Cretaceous��dated by zircon U-Pb ages ranging between 104 and 112 Ma�� Petrologically�� the Yingcheng Formation is composed dominantly of trachyte��rhyolite��comendite and rhyolitic tuff�� which all belong to subalkaline series and correspond to rhyolite in chemical composition�� Geochemically��the volcanic rocks are rich in silicon and alkalis��poor in aluminum��calcium and magnesium��and characterized by light rare earth elements enrichment and heavy rare earth elements depletion��e. g. the chondrite normalized ( La /Yb) N values of 7. 15 �� 10. 38 and δEu values of 0. 16 �� 0. 65�� Primitive mantle-normalized multi-element patterns are characterized by relative enrichments in K����b��and L��EE but depletions in Ba and Sr��as well as P and Ti�� However�� they exhibit little or no depletion in Nb and Ta�� The rhyolites magma was originated from partial melting of juvenile crustal materials�� |
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Keywords��
Changling depression
volcanic rocks
Yingcheng Formation
zircon U-Pb dating
petrogenesis
geochemistry
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Received Revised Online: |
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