红旗岭―茶尖岭矿带部分含矿岩体时代认识——从陆壳、岩石圈角度认识含矿镁铁-超镁铁质岩体时代

红旗岭―茶尖岭矿带发育镁铁-超镁铁岩体(岩墙群)及铜镍硫化物矿床。关于该矿带含矿岩体时代的观点包括华力西期和印支期。含铜镍硫化物矿床的镁铁-超镁铁岩体(岩墙群)发育要件:初始成熟陆壳、较薄的岩石圈、拉张应力背景,三者缺一不可。只有符合地质事实、符合矿带含铜镍矿镁铁-超镁铁岩体(岩墙群)发育要件的同位素定年数据,才能代表含矿岩体的成岩成矿时代。红旗岭—茶尖岭矿带印支期不具备含矿镁铁-超镁铁岩体(岩墙群)产出的要件。华力西期350Ma,矿带具备红旗岭1号、7号含中、大型铜镍硫化物矿床的镁铁-超镁铁岩体产出的要件,理应代表1号、7号岩体时代;华力西期258Ma,矿带具备茶尖岭包括1号、6号、新6号等含小型铜镍硫化物矿床的镁铁-超镁铁质岩体产出的要件,均代表茶尖岭矿区的镁铁-超镁铁岩体的时代。

An understanding of the age of some ore-bearing rock mass in Hongqiling-Chajianling ore belt:to understand the age of ore-bearing mafic-ultramafic rock mass from perspectives of continental curst and lithosphere

Mafic-ultramafic rock mass (dike swarm)and Cu-Ni sulfide deposits develop in Hongqiling-Chajian-ling ore belt.There are two different points of view about the age of ore-bearing rock mass in the ore belt, namely Variscan period and Indosinian period.The essential requirements of the development of mafic-ultra-mafic rock mass (dike swarm)which contains Cu-Ni sulfide deposits include initial mature continental crust, thin lithosphere,and stretching stress background.Each of the three conditions is indispensable.Only the isotope dating data which matches the geologic facts and the essential requirements of development of mafic-ultramafic rock mass (dike swarm)which contains Cu-Ni sulfide deposits in the ore belt can represent the petrogenic and metallogenic age of ore-bearing rock mass.Hongqiling-Chajianling ore belt in Indosinian period doesn’t meet the essential requirements of the occurrence of ore-bearing mafic-ultramafic rock mass (dike swarm).In Variscan period (350 Ma),the ore belt meets the essential requirements of the occurrence of the No.1 and No.7 mafic-ultramafic rock mass which contains medium-large Cu-Ni sulfide deposits,so it should represent the age of No.1 and No.7 rock mass in Hongqiling mining area;in Variscan period (258 Ma),the ore belt meets the essential requirements of the occurrence of the No.1,No.6 and No.new 6 mafic-ultra-mafic rock mass which contains small Cu-Ni sulfide deposits,so it should represent the age of mafic-ultra-mafic rock mass in Chajianling mining area.