南太行叩天井地区中生代超基性岩中捕掳体的成因矿物学研究  

Genetic Mineralogy of Xenolith in Mesozoic Ultrabasic Rocks in Koutianjing Area of Southern Taihang

作　　者：秦超 唐玉莹 金雅楠 范琳琳 白富生 张聚全 QIN Chao;TANG Yu-ying;JIN Ya-nan;FAN Lin-lin;BAI Fu-sheng;ZHANG Ju-quan(Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]河北地质大学,河北石家庄050031

出　　处：《河北地质大学学报》2021年第4期19-25,共7页Journal of Hebei Geo University

基　　金：国家自然科学基金项目(41602028);河北教育厅在读研究生创新能力培养项目(CXZZSS2021121);河北地质大学第十七届学生科研项目(KAY202105);河北地质大学第十七届学生科研项目(KAY202106)。

摘　　要：为研究南太行叩天井地区超基性岩中捕掳体的的成因,利用电子探针对超基性岩捕掳体中的角闪石进行了成分分析,结果表明,其具有富镁、钙,贫钾、钛的特征。角闪石主要为韭闪石,少部分为浅闪石。角闪石矿物温压计结算结果显示,角闪石结晶温度为883℃~983℃,平均为941℃,压力范围在241 Mpa~535 Mpa,平均为413 Mpa,对应深度8.5 km~19 km,平均为14.6 km。综合角闪石的化学成分特征,认为角闪石结晶处于高氧逸度环境(ΔNNO+1.3~+2.1),超基性岩包体的母岩浆来自于幔源,属于钙碱性岩浆,且角闪石结晶时深部岩浆房具有很高的含水量(6.8%~8.4%)。In order to study the genesis of the xenoliths in the ultrabasic rocks in the Koutianjing area of Southern Taihang,the composition of amphibole in the xenoliths was analyzed by electron microprobe.The results showed that the xenoliths are rich in magnesium,calcium,poor in potassium and titanium.The main part of amphibole was pargasite,and the rest is edenite.As the results of mineral thermo barometer settlement showed that,the crystallization temperature of amphibole ranged from 883℃to 983℃,with an average of 941℃.the pressure ranged from 241 MPa~535 MPa,with an average of 413 MPa,and the corresponding depth ranged from 8.5 km~19 km,with an average of 14.6 km.Based on the chemical composition of amphibole,it was considered that the crystal of amphibole was in a high oxygen fugacity environment(ΔNNO+1.3~+2.1).The parent magma of ultrabasic xenoliths was derived from mantle and belonged to calc-alkaline magma,and water content of the deep magma chamber was a little high(6.8%~8.4%)during the progress of amphibole crystallization.

关 键 词：叩天井 超基性岩 闪长质包体 角闪石 

分 类 号：P612[天文地球—矿床学]