GEOCHEMICAL CHARACTERISTICS AND TECTONIC BACKGROUND OF BASALT FROM TAMULANGOU FORMATION IN NORTHERN DAXINGANLING

ZHANG Yu; ZHAO Huan-li; HAN Yan-dong

doi:10.13686/j.cnki.dzyzy.2005.02.002

ZHANG Yu, ZHAO Huan-li, HAN Yan-dong. GEOCHEMICAL CHARACTERISTICS AND TECTONIC BACKGROUND OF BASALT FROM TAMULANGOU FORMATION IN NORTHERN DAXINGANLING[J]. Geology and Resources, 2005, 14(2): 87-91,96. DOI: 10.13686/j.cnki.dzyzy.2005.02.002

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GEOCHEMICAL CHARACTERISTICS AND TECTONIC BACKGROUND OF BASALT FROM TAMULANGOU FORMATION IN NORTHERN DAXINGANLING

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Study on the petrology, geochemistry and tectonic setting of the basalt from Tamulangou formation indicates that the basic volcanic rocks are geochemically similar to both tholeiitic basalt and alkali basalt, with Na₂O-22O, nonegative Eu anomaly, La/Yb=35.7, rich Ba, Sr and K, and deficient Nb. The magma is probably generated by rifting. In such a thermal-tectonic event, it is speculated that the crust in Shangheilongjiang area and the lithosphere in Huzhong area were thinned greatly; while the lithosphere and the crust in Genhe area were slightly thinned.

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GEOCHEMICAL CHARACTERISTICS AND TECTONIC BACKGROUND OF BASALT FROM TAMULANGOU FORMATION IN NORTHERN DAXINGANLING

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