摘要
吉林红旗岭铜镍硫化物矿床是我国第二大岩浆型铜镍硫化物矿床。为查明其岩浆来源、结晶温压条件等,通过薄片鉴定及电子探针分析方法对红旗岭成矿岩体辉石化学成分特征进行了研究。结果表明：红旗岭单斜辉石全部为普通辉石,斜方辉石均为古铜辉石;辉石成分变化较大,普遍富镁贫铁,总体上表现出低w（TiO2）、w（Al2O3）和w（Na2O）的特征;单斜辉石Di端元比例变化较大,具有由富镁向富钙方向演化的趋势,与世界上一些典型镁铁—超镁铁岩体单斜辉石的演化趋势明显不同。红旗岭主要成矿岩体母岩浆属于拉斑玄武质岩浆,为幔源岩浆,分异程度较高。辉石温压计算结果表明,红旗岭主要成矿岩体辉石结晶温度为1 100~1 250℃,岩体形成深度为12.3~20.7km。
The Hongqiling Cu-Ni sulfide deposit is a magmatic deposit that ranks second in China.In order to investigate the source of magma and temperature pressure conditions of crystallization,the chemical composition of the pyroxene in metallogenetic intrusions of Hongqiling was studied by rock slice identification and electron probe analysis.The results show that all clinopyroxene minerals are augite,and orthopyroxenes are all bronzite.The chemical compositions of the pyroxene change widely and the pyroxene is charactered by enrichment in Mg and depleting of Fe,with low content of TiO2,Al2O3 and Na2O.The Di-endmember of the clinopyroxene changes widely with the evolution from Mgenrichment to Ca-enrichment,which shows a different variation tendency with the clinopyroxene from other typical mafic-ultramafic intrusions in the world.The source of magma was mantle-derived basalt magma,with high degree of differentiation.According to pyroxene thermobarometer,the crystallizationtemperature of the pyroxene in major metallogenetic intrusions of Hongqiling is estimated to 1 100-1 250℃ and the rock-forming depth is around 12.3-20.7km.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2015年第1期95-105,共11页
Journal of Jilin University：Earth Science Edition
基金
全国危机矿山接替资源找矿项目(20089941)
国家深部探测技术与实验研究专项项目(SinoProbe-04-05-02)
关键词
辉石
地球化学
结晶温压条件
红旗岭
铜镍矿床
pyroxene
geochemistry
temperature and pressure conditions of crystallization
Hongqiling
Cu-Ni sulfide deposit
