摘要
以1号和7号岩体为代表的红旗岭铜镍硫化物矿床,是兴蒙造山带中典型的岩浆熔离型矿床。矿区内共有30多个镁铁-超镁铁质岩体,3号岩体是其中的含矿岩体,多年来因其地质产状与主要含矿岩体不同被认为形成于燕山期。本次工作对采自不同深度岩心样品中的单矿物角闪石进行40Ar/39Ar同位素年代学研究,得到(228.2±3.0)Ma的坪年龄和(230.1±7.1)Ma的等时线年龄。该年龄和近年发表的红旗岭1号岩体地质年龄基本一致,说明它们均为早印支期岩浆作用的产物。通过对比分析1号和7号主含矿岩体与3号岩体的岩石地球化学特征发现,无论是稀土元素还是微量元素图解均显示了它们具有相同的配分模式,暗示了这些岩体的同源性特点。
The Hongqiling magmatic Cu-Ni sulfide deposit represented by No.1 and No.7 intrusions belongs to a typical magmatic liquation deposit in Xing＇an-Mongolia orogenic belt.More than 30 mafic-ultramafic intrusions have been found in the Hongqiling mining district.The No.3 intrusion,whose geological occurrence were different from those of other ore-bearing rock bodies,was once thought to be formed during the Yanshanian era.The 40Ar/39Ar isotopic dating of amphiboles collected from different depths of core samples in No.3 intrusion gave a（228.2±3.0） Ma plateau age and a（230.1±7.1） Ma isochron age.These isotopic ages consist generally with the ages of No.1 intrusion published before,all being derived from the Early Indosinian magmatism.Geochemical studies of No.1,No.3,and No.7 ore-bearing intrusions also suggest these intrusions were derived from a common source according to their similar curve patterns of REE and trace elements.This opinion could be significant for guiding further exploration of the magmatic Cu-Ni deposits in the area.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第2期321-326,共6页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(40572058)
四川省教育厅自然科学类项目(省504)
四川省重点学科建设项目(SZD414)
关键词
铜镍硫化物矿床
吉林省红旗岭
兴蒙造山带
地质年代学
magmatic Cu-Ni sulfide deposit
Hongqiling
Jilin Province
Xing＇an-Mongolia orogenic belt
geochronology
