机构地区: 中山大学地球科学系
出 处: 《中山大学学报(自然科学版)》 1997年第2期96-99,共4页
摘 要: 粤西东田金矿的赋矿围岩—黑云斜长片麻岩的原岩为英云闪长岩,其中的锆石U-Pb同位素年龄测定结果表明,它的成岩年龄为2273Ma,它是云开隆起区广泛分布的片麻状黑云母花岗岩的源岩之一和金、银。 Dongtian gold deposit occurs in the biotiteplagioclase gneiss, whose protolith is tonalite. Results of zircon U Pb analysis of the biotiteplagioclase gneiss show that the tonalite is formed at 2 273 Ma. It is one of the source rock of the gneissic biotite granites widely distributed in Yunkai uplifted area and the ore forming material source of gold, silver, and tungsten mine.