Geochemical and Sr-Nd Isotopic Characteristics of the Volcanics from the Qi’eshan Group in Eastern Tianshan and Its Implications

Abstract

Abstract:

Based on the geochemical data including major elements, trace elements and Sr-Nd isotopes of the volcanics from Qi’eshan Group occurring in the Jueluotage tectonic belt in eastern Tianshan, the volcanic rocks can be divided into theoleiitic series and calc-alkaline series. All of these volcanics show relative enrichment in aluminium, LREE, LILE and depletion in titanium. The calc-alkaline basalt has a characteristic of Eu anomalies, and the contents of incompatible trace elements are higher than those of the tholeiite basalt. The calc-alkaline basalt is the product of crystallization differentiation, and the tholeiite basalt is the product of partial melting from the La/Sm-La diagram. Initial Sr and Nd isotopic compositions show that the basalts from the Qi’eshan Group are derived from depleted mantle. In the discrimination diagram, samples from the Qi’eshan Group are plotted in the field of island arc basalt. The characteristics of the rock combination, geophysics, geochemistry，and the results of previous studies suggest that Qi’eshan Group formed in Dananhu island arc setting owing to the northward subduction of the Kanggur ocean.

Key words: Qi’eshan Group, petrogeochemistry, Sr-Nd isotopes, tectonic setting

CLC Number:

P588.1

YANG Zhen，MUHETAER Za-ri，WU Zhao-ning，SHE Jian-zhong，YU Niu-ben. Geochemical and Sr-Nd Isotopic Characteristics of the Volcanics from the Qi’eshan Group in Eastern Tianshan and Its Implications[J]. Geoscience, 2015, 29(4): 866-872.

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Geochemical and Sr-Nd Isotopic Characteristics of the Volcanics from the Qi’eshan Group in Eastern Tianshan and Its Implications

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