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太行山北段王安镇岩基超镁铁质岩中角闪石成因意义

ISSN号：1000-6524
期刊名称：《岩石矿物学杂志》
时间：0
分类：P578.955[天文地球—矿物学;天文地球—地质学]
作者机构：[1]中国地质大学地球科学与资源学院,北京100083
相关基金：国家重点基金（90914002）;长江学者和创新团队发展计划（IRT1083）;111计划项目（B07011）致谢感谢中国地质大学（北京）地学实验中心电子探针室尹京武教授的帮助;论文撰写还得到了董美玲、罗微和王鹏等研究生的帮助,在此一并表示衷心感谢!

关键词：超镁铁质岩, 角闪石环带, 构造意义, 太行北段, 华北克拉通, ultramafic rocks, zoned amphiboles, tectonic significance, northern Taihang Mountains, North China Craton

中文摘要：

太行山北段中生代岩基中发育有基性-超基性岩体.本文以太行山北段王安镇岩基中的窑沟岩体为研究对象,对橄榄辉石角闪石岩中角闪石的矿物学特征以及形成条件进行初步研究,探讨其成因意义.结果表明,窑沟岩体橄榄辉石角闪石岩中的角闪石属于岩浆成因,并且角闪石环带发育,核部呈棕色,边缘为绿色,两者具有共同的特征,其（Ca＋ Na）B≥1.00,NaB＜ 0.50,均属于钙质角闪石.它们的Si/（Si＋ Ti＋ A1）值的范围为0.7042～0.788 5,属幔源角闪石.Na、K、Ti、Al和Fe^3＋的相对含量存在差异,其棕色部分为镁绿钙闪石,绿色部分为镁绿钙闪石质普通角闪石以及浅闪石质普通角闪石.角闪石的环带特征反映出同一期岩浆结晶的不同阶段,体现出压力和温度等生成条件的变化.角闪石环带中核部的镁绿钙闪石结晶时温度和压力较高,深度较大,属于下地壳环境;而边缘角闪石在较低压地壳环境生成.角闪石所体现的岩浆来源于上地幔,并且在燕山运动前期的晚三叠世开始集聚,先其周围的中酸性岩体侵位,暗示在晚三叠世华北克拉通岩石圈就已发生部分熔融和华北克拉通破坏的开始.

英文摘要：

Basic-ultrabasic rocks are developed in Taihang Mountain area.With olivine pyroxene hornblendite from the Yaogou hornblendite body in the Wang＇ anzhen batholith of north Taihang Mountains as the study object,the authors carried out a preliminary study of the mineralogical characteristics and formation conditions of the amphiboles so as to investigate their genetic significance.The results show that there are two kinds of amphiboles in the olivine pyroxene hornblendite,which belong to calcic amphibole with （Ca＋ Na）B≥1.00 and NaB 〈0.50.Their Si/（Si ＋ Ti ＋ A1） ratios are between 0.704 2 and 0.788 5,indicating that they are mantle amphiboles.Based on the relative content of Na,K,Ti,Al and Fe^3 ＋,the authors further divided the calcic amphibole into magnesium hastingsite in brown color and magnesium hastingsitic hornblende to edenitic hornblende in green color.The amphibole zonation indicates that the amphiboles were formed at different stages of the same magma crystallization characterized by different pressure and temperature conditions.The magnesium hastingsite was crystallized at high temperature and pressure and in great depth,belonging to the lower crustal environment.The edge of the amphibole was generated in a lower pressure crustal environment.The amphibole magma was derived from the upper mantle and began to concentrate before the Yanshanian movement in late Triassic.Later,intermediate-acid magma was emplaced to form a granitic batholith.These data indicate that partial melt-ing in the lithosphere of the North China Craton took place in late Triassic and that the North China Craton started to be destroyed at that time.

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