Global Geology 2016, 19(3) 164-176 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
Baiyingaolao Formation
zircon U- Pb dating
geochemistry
Hailar Basin
Authors
LI Xu
SUN Deyou
and GOU Jun
PubMed
Article by Li X
Article by Sun D
Article by And GJ

Geochemical characteristics and petrogenesis of volcanic rocks from Baiyingaolao Formation in northeastern Hailar Basin

LI Xu, SUN Deyou, and GOU Jun

College of Earth Sciences,Jilin University,Changchun 130061,China

Abstract

The volcanic rocks from Baiyingaolao Formation in the northeastern Hailar Basin are mainly com- posed of rhyolite and trachydacite. U- Pb dating of zircon shows these volcanic rocks formed in Early Cretaceous (128- - 124 Ma). Geochemical data indicate that they are sub- alkaline series in composition and rich in alkali and potassium. All samples have similar rare earth element patterns characterized by high total rare earth ele- ments contents (∑REE = 113.96 × 10-6-204.33 × 10-6 ),significant fractionation of heavy and light rare earth elements (∑LREE/∑HREE = 3.10-4.52) with middle negative Eu anomalies (δEu = 0.46-0.76). The trace elements are characterized by enrichment in large- ion lithophile elements such as K,Rb,LREE and depletion in high field strength elements e.g. Nb, Ta, HREE, P and Ti, while enriched in Th and U. Rhyolite and trachydacite contain low initial 87 Sr/ 86 Sr ratios (0.704 9-0.7 053) and positive ε Nd (t) values (ca.4.15). These data suggest that the magma of rhyolite and trachydacite were derived from mafic lower crust newly accreted from mantle,with the evolutional trend of comagmatic fractional crystallization.

Keywords Baiyingaolao Formation   zircon U- Pb dating   geochemistry   Hailar Basin  
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