东天山阿齐山地区石炭纪火山岩及构造演化

Volcanic Rocks and Tectonic Evolution in Carboniferous of Aqishan,Eastern Tianshan

通过对阿齐山地区石炭纪火山岩的研究,利用岩石学、岩石化学成果数据,结合前人研究成果,对阿齐山地区构造演化模式进行论述,并探讨其与成矿之间的关系。提出了研究区石炭纪的岩浆岩是活动大陆边缘环境的产物,是俯冲环境下强烈的壳幔相互作用与热循环作用的结果;活动大陆边缘环境及其伴随的构造岩浆事件,为研究区赋存于早石炭世早期中-基性火山岩中的铁矿床和早石炭世晚期中-酸性火山岩中铅锌矿床的形成创造了极为重要的动力条件,也为矿床形成提供重要的成矿物质,晚石炭世的火山活动使早期矿化层发育了强烈的蚀变作用。

Together with previous studies, geological survey and petrological and geochemical studies were carried out to constrain the tectonic background and related mineralization relationship for the Aqishan Carboniferous volcanic rocks, the eastern Tianshan Mpuntains. These volcanic rocks erupted in an active continental margin. Intensive mantle crustal interaction and thermal cycling for these Carboniferous intermediate-mafic volcanic rocks driven by subduction- related tectonic mechanism provide so und dynamic condition and material for the mineralization of the Pb-Zn ore depos- its. Early stage ore layers were altered during Late Carboniferous volcanism.