新疆且干布拉克超基性岩-碳酸岩杂岩体Sm-Nd同位素年龄及其地质意义  

Sm-Nd isotopic age of Qieganbulak ultrabasic-carbonatite complex in Xinjiang, China and its geological significance.

作　　者：孙宝生[1] 黄建华[1] 

机构地区：[1]新疆大学资源环境学院,乌鲁木齐830046

出　　处：《岩石学报》2007年第7期1611-1616,共6页Acta Petrologica Sinica

基　　金：国家重点基础研究规划项目课题(2007CB411308);国家自然科学基金(49862002);国家973项目(2001CB409809);新疆高校重点项目(XJDEU2004107)资助。

摘　　要：产有超大型蛭石-磷灰石矿床的且干布拉克超基性岩碳酸岩杂岩体位于塔里木板块东北缘库鲁克塔格断隆南侧,其 Sm-Nd 等时线年龄为(802±52)Ma,ε_(ND)(t)=0.471,模式年龄 t_(TM)^(Nd)为1208～1635Ma,表明该杂岩体形成于新元古代。塔北裂谷在新元古代的强烈活动,可以看作是 Rodinia 超大陆裂解的组成部分。A super-large vermiculite-apatite deposit originated from the Qieganbulak ultrabasic complex and is located in Southern Kuluketage fault block, northeastern margin of Tarim. A study of the Sm-Nd isotope composition of Qieganbulak uhrabasic complex Nd make known isochron age 802 ± 52Ma, εNd （t） = 0. 471, and its model age （tTM^Nd） in the range of 1206 - 1635Ma, in dicates that the complex was formed in the late stage of the Upper Proterozoic Subera. In combination with its facies association, petrochemistry, REE Patterns, trace elements, C, O, Sr isotopic compositions and associated vermiculite-apatite orebodies, it is believed that the Qieganbulak complex magma derived from the enrich-mantle Source formed by mantle metasomatism and formed in continental rift.

关 键 词：超基性岩-碳酸岩杂岩体 同位素年龄 且干布拉克 新疆 

分 类 号：P588.125[天文地球—岩石学] P588.15[天文地球—地质学]