新疆谢米斯台地区中段火山岩岩石学、地球化学及其含矿性研究

The research of igneous petrology,geochemistry and mineral-bearing quality in mid-segment of Xiemisitai Mountain,Xinjiang

新疆西准噶尔谢米斯台山地区位于西伯利亚板块与准噶尔板块之间的古生代萨吾尔—阿尔曼太复合岛弧内。该地区的火山岩以安山岩—英安岩—流纹岩组合为主,有少量的粗面岩产出。在地球化学特征上,火山岩SiO_2含量变化范围较大(53.91～75.71 wt%),K_2O/Na_2O比值为0.45～1.89,Al_2O_3含量较高(10.81～17.94 wt%),铁含量低(1.20～7.26 wt%),TiO_2含量低(0.19～1.78 wt%),大离子亲石元素及轻稀土元素富集,微量元素具岛弧火山岩特征;地球化学的特征以及在该地区发现的大量铜矿化,预示着该地区将是一个有利的成矿远景区。

Xiemisitai Mountain located in the Sawuer-Aermantai Paleozoic complex island arc that between Junggar and Siberia Plate. The igneous rocks of this area mostly was andesite-dacite-rhyolite,and there were a few outcrop that was trachyte. The geochemistry characters as follows,the igneous rocks take the great range of SiO_2（53.91～75.71 wt%）,K_2O/Na_2O ratio was 0.45～1.89,high-Al_2O_3（10.81～17.94 wt%）,low-Fe（1.20～7.26 wt%）,low-TiO_2（0.19～1.78 wt%）,large-ion lithophile element and LREE were enriched,trace element had the island arc rocks characters. The geochemistry characters and the much mineralization prefigured that this area would be a advantaged mineral foreground area.