张宣隆起核部的转枝莲辉石闪长岩  

The Zhuanzhilian pyroxene diorite in core of Zhang-Xuan upwarp.

作　　者：邵济安[1] 魏春景[1] 张履桥 牛树银[3] 牟保磊[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]内蒙古地质研究所,呼和浩特010020 [3]石家庄经济学院勘查技术学院,石家庄050031

出　　处：《岩石学报》2004年第6期1389-1396,共8页Acta Petrologica Sinica

基　　金：国家自然科学基金基项目(40072073;40372103);中国科学院知识创新工程重大项目(KZCX1-07)

摘　　要：位于冀西北张家口-宣化地区的转枝莲辉石闪长岩侵入水泉沟正长岩杂岩体中。该岩石由紫苏辉石、次透辉石、黑云母、中长石、正长石以及磷灰石、钛铁矿等副矿物组成。全岩分析结果SiO_253％～59％。本文根据上述两点将其命名为辉石闪长岩,通过岩石成因、稀土元素分布模式和岩石的Sr-Nd同位素组成研究,认为岩体是上地幔和下地壳物质部分熔融的产物,辉石闪长岩的Rb-Sr等时线年龄为143Ma。The Zhuanzhilian pyroxene diorite is found in Zhangjiakou-Xuanhua area, northwest of Hebei Province. It intrudes into the Shuiquangou syenite complex and consists of hypersthene, salite, biotite, andesine, orthoclase and accessory minerals such as apatite and ilmenite. Bulk-rock analysis indicated that 53% similar to 59% of its composition is SiO2. We categorized it as pyroxene diorite according to petrologic principles. Studies on petrogenesis, REE patterns, and Sr-Nd isotopic composition of the rock suggest that the rock mass comes from partial melting of the the materials originated from in the lower crust and upper mantle. Age of the pyroxene diorite is 143Ma according to Rb-Sr isochron dating.

关 键 词：辉石闪长岩 岩石成因 RB-SR等时线年龄 构造背景 

分 类 号：P588.122[天文地球—岩石学] P597.3[天文地球—地质学]