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地质学报  2011 

南极格罗夫山陨石GRV020043―一个特殊的E/H过渡型球粒陨石

, PP. 129-135

Keywords: 南极格罗夫山南极陨石GRV020043平衡型球粒陨石普通球粒陨石E/H过渡型球粒陨石

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Abstract:

南极格罗夫山陨石GRV020043是一块特殊的球粒陨石,虽与普通球粒陨石有着相似的矿物组合,但矿物成分超出普通球粒陨石范围。主要矿物组合及其模式含量(vol%)是:斜方辉石40、橄榄石24、透辉石8、斜长石10、Fe-Ni合金14、陨硫铁4vol%、及少量铬铁矿和磷灰石。主要组成矿物成分均一,如斜方辉石(Fs10.1-11.6,平均Fs10.9)、橄榄石(Fa10.4-12.4,平均Fa11.0)、透辉石(Wo46.1-47.1En49.0-49.6Fs3.8-4.4,平均Wo46.6En49.3Fs4.0)、斜长石(Ab55.7-72.5Or2.1-5.0An24.0-42.1,平均Ab67.6Or3.4An29.0)等。该陨石球粒轮廓清晰结构完整,球粒丰度37vol%,基质具有中等重结晶,岩石类型属于4型。根据矿物成分判断,GRV020043陨石的氧化程度和橄榄石含量介于E群和H群之间,故将该陨石划分为E/H过渡型球粒陨石。

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