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Zircon U-Pb ages and Hf-O isotope compositions of the Zhaheba ophiolite in the northern margin of the Junggar terrane and their tectonic implications
Pages: 106-112
Year: Issue:  2
Journal: Resources Survey & Environment

Keyword:  扎河坝蛇绿岩年龄同位素地质意义;
Abstract: 扎河坝蛇绿岩位于准噶尔北缘,是扎河坝—阿尔曼太蛇绿混杂岩带的一部分.通过对蛇绿混杂岩中堆晶辉长岩和凝灰岩夹层的锆石U-Pb年龄及Hf-O同位素进行研究,获得堆晶辉长岩的结晶年龄为485±4Ma,凝灰岩的喷发年龄为401±2.5Ma.辉长岩极度亏损Hf同位素,εHf (t)为13~20,δ18O峰值为+5.37‰,显示其具有地幔特征.凝灰岩锆石的Hf同位素亏损程度低于堆晶辉长岩,εHf (t)为1.4~9.2.扎河坝蛇绿岩具有典型的SSZ型蛇绿岩特征,是通过俯冲增生到洋内弧弧前的蛇绿岩.
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