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地质学报  2011 

宁芜盆地玢岩型铁矿床的成矿时代:金云母40Ar-39Ar同位素年代学研究

, PP. 810-820

Keywords: 成矿时代,玢岩型铁矿,宁芜盆地,构造背景

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Abstract:

宁芜盆地是长江中下游成矿带的重要组成部分,盆地内广泛产出玢岩型铁矿床,但其精确的成矿时代及其形成构造背景研究仍十分薄弱。本文在详细野外地质工作的基础上,选择与磁铁矿密切共生的金云母为对象,利用40Ar-39Ar阶段加热同位素定年方法,对盆地内典型玢岩型铁矿床进行了成矿时代研究,确定了盆地内主要玢岩型铁矿床陶村、白象山和和睦山矿床的成矿时代分别为129.3±1.1Ma、130.7±1.1Ma和129.1±0.9Ma。结合矿床地质特征和闪长玢岩成岩时代,确定宁芜盆地内玢岩型铁矿床的成矿时代均为130Ma左右,其形成时代明显晚于长江中下游成矿带断隆区内的斑岩型-矽卡岩型铜(铁)、金矿床。宁芜盆地内玢岩型铁矿床形成于区域岩石圈伸展的构造环境。

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