CAJ | 학술논문

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(Al2 O3)和 w(Na2 O)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1100~1250℃,岩体形成深度为12.3~20.7 km。
길림홍기령동얼류화물광상시아국제이대암장형동얼류화물광상。위사명기암장래원、결정온압조건등,통과박편감정급전자탐침분석방법대홍기령성광암체휘석화학성분특정진행료연구。결과표명：홍기령단사휘석전부위보통휘석,사방휘석균위고동휘석；휘석성분변화교대,보편부미빈철,총체상표현출저 w(TiO2)、w(Al2 O3)화 w(Na2 O)적특정；단사휘석 Di 단원비례변화교대,구유유부미향부개방향연화적추세,여세계상일사전형미철초미철암체단사휘석적연화추세명현불동。홍기령주요성광암체모암장속우랍반현무질암장,위만원암장,분이정도교고。휘석온압계산결과표명,홍기령주요성광암체휘석결정온도위1100~1250℃,암체형성심도위12.3~20.7 km。
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 , Al2 O3 and Na2 O.The Di-endmember of the clinopyroxene changes widely with the evolution from Mg-enrichment 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 crystallization temperature 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 20.7 km.