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.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
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
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
Porphyry assemblage of Kulesayi series in Early Carboniferous
Adakite rocks
Significance of Mo prospecting
Tekesi Daban
Western Tianshan
