陕西略阳徐家坪界口金伯利岩性质及含矿性分析  

Analysis of jiekou Kimberliite occurring in Xujiaping,Lueyang county of Shaanxi province

作　　者：陈元 李青翠 陈炜华 周旭 chenyuan;liqingcui;chenweihua;zhouxu(Shaanxi Geology and Mining Group Co.,Ltd.,Xi'an 710054;Shaanxi Institute of Geology and Mineral Resources Experiment Co.,Ltd.;Shaanxi Institute of Surveying and Mapping of Land LTD.)

机构地区：[1]陕西地矿集团有限公司,陕西西安710054 [2]陕西省地质矿产实验研究所有限公司,陕西西安710054 [3]陕西国土测绘工程院有限公司,陕西西安710054

出　　处：《陕西地质》2022年第1期12-17,共6页Geology of Shaanxi

基　　金：陕西地矿集团有限公司科研专项资金项目“陕西略阳地区徐家坪界口岩体性质及其含矿性研究”(KY201911)。

摘　　要：徐家坪界口岩体位于勉略缝合带略阳一带,岩体为超基性岩,具斑状结构,岩球状构造,遭受强烈蛇纹石化和不同程度的碳酸盐化。岩石微量元素含量基本落入我国(山东、辽宁)及国外金伯利岩微量元素含量范围内,相对富集LREE和大离子亲石元素(Cs、Ba、U、Th),亏损(K、Sr),强烈亏损K元素。金伯利岩可能是由富集型地幔岩浆经低程度的部分熔融而成的,岩浆演化过程中有较少的橄榄石和尖晶石类矿物的分离结晶作用和较弱的同化混染作用。元素地球化学特征暗示金伯利岩贫矿。The Jiekou rock mass lies in the Mianxian-Lueyang area of the Mian-Lue suture zone with patchy and spherical structure,suffering from strong serpentinization and different degrees of carbonation,in which the content of trace elements basically falls into the range of trace elements of kimberlite occurring in China(Shandong,Liaoning)and other countries,including relatively rich in LREE and large ion lithophilic elements(Cs,Ba,U,Th),loss(K,Sr)and strong loss of K elements.Kimberlite may result from low partial melting of enriched mantle magma,with less separation and crystallization of olivine and spinel minerals and weaker assimilation mixes during magma evolution.The emental geochemistry suggests that Kimberlite in this area should be poor.

关 键 词：略阳 徐家坪 界口岩体 贫矿 

分 类 号：P584[天文地球—岩石学]