西天山特克斯达坂库勒萨依序列埃达克岩的确立及钼找矿意义  

Identification of the adakite rocks of Kulesayi series and it's significance of Mo prospecting in the Tekesidaban of western Tianshan.

作　　者：李永军[1] 辜平阳[1] 庞振甲[1] 栾新东[2] 佟丽莉[1] 

机构地区：[1]长安大学地球科学与资源学院,西部矿产资源与地质工程教育部重点实验室,西安710054 [2]新疆地质矿产勘查开发局地质九队,乌鲁木齐830000

出　　处：《岩石学报》2008年第12期2713-2719,共7页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(40534020);新疆维吾尔自治区地质矿产调查项目(XJQDZ2003-24)资助

摘　　要：库勒萨依序列斑岩体δ平均3.05,属于钙碱性系列岛弧浅成岩。SiO_2含量为57.06%～70.74%,高 Al_2O_3、Na_2O、Sr和相对富集 LREE,低 MgO、Y、Yb,强烈亏损 HREE。Na_2O/K_2O>1,Sr/Y 平均57.67,正 Eu 异常,因而具有典型 O 型埃达克岩特征。库勒萨依序列斑岩体与 Mo 异常套合好,已发现钼矿体,找矿前景良好。该埃达克岩的确立,对深化西天山区域成矿规律和指导今后找矿具有借鉴和指导意义。The porphyry assemblage of Kulesayi series is calc-alkaline hypabyssal rocks formed in island-arc environment with a mean value of δ =3.05 and a mean content of SiO2 =57.06 -70. 74%. They are rich in Al2O3, Na2O, Sr and LREE, and poor in MgO, Y, Yb and HREE. Their Na2O/K2O is larger than 1, Sr/Y is 57. 67, Eu anomaly is positive, which indictes characters of Otype adakite. The porphyry assemblage of Kulesayi series from which Mo orebodies have been discovered correlates well with anomaly of Mo, therefore it has a good ore-prospecting future. The understanding of adakite rocks provides significant information for improving native metallogenic disciplinarian and guiding future ore-prospecting in western Tianshan.

关 键 词：早石炭世勒萨依序列斑岩 埃达克岩 钼找矿意义 特克斯达坂 西天山 

分 类 号：P618.651[天文地球—矿床学] P588.122[天文地球—地质学]