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Geochemical Characteristics and Tectonic Setting of Rhyolites of the Early Cretaceous Shangkuli Formation，North Daxing’anling

Yin Zhigang1，Zhang Yuelong2，Du Yuchun1   

  1. 1.College of Mining Engineering，Liaoning Technical University，Fuxin123000, Liaoning，China;
    2.Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar161005, Heilongjiang，China
  • Received:2012-06-21 Online:2013-05-26 Published:2013-05-26

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Abstract:

The rhyolites of the Early Cretaceous Shangkuli Formation in northern Daxing’anling belong to high-K calc-alkaline volcanic rock series characterized by rich-alkaline (K2O+Na2O>6.10%), high K2O (3.25%-5.30%) and  high ratios of K2O/Na2O (0.67-2.48). These samples show strong enrichment in large ion lithophile elements (LILE) and in light rare earth elements (LREE). But the elements of Ba, Sr, Nb, P, and Ti are apparently depleted. The higher Th content and high Rb/Ba, Rb/Sr and Zr/Ba ratios of the rhyolites suggested a continental intraplate rifted setting related to the extension stage after the formation of Mongolia-Okhotsk orogenic belt. The current data indicate that the parental magma for rhyolites could be the products of the lower crust partial melting.

Key words: rhyolites, geochemistry, Early Cretaceous, crustal melting, north Daxing’anling

CLC Number: 

  • P59
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