| 两个古铜辉石样品的G.P区研究 |
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| 引用本文： | 黄婉康,康振川.两个古铜辉石样品的G.P区研究[J].矿物学报,1989,9(2):104-111. |
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| 作者姓名： | 黄婉康 康振川 |
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| 作者单位： | 中国科学院地球化学研究所 贵阳
(黄婉康)，北京冶金研究所 北京(康振川) |
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| 摘 要： | 在两个斜方辉石样品中观察到G.P.区亚稳相。内蒙古暗色辉长岩古铜辉石成分是En_(77)Fs_(18·6)Wo_(4·4),其高分辨象显示了密集的单层G.P.区;玄武岩中变辉长岩包体古铜辉石成分是En_(72·2)Fs_(25·7)Wo_(2·1),具双层G.P.区。该包体与具多层G.P.区的月岩橄长岩相似,后期冷却极快。在地体火成岩体结晶和冷却过程中易出现单层G.P.区,而岩体的大小,冷却的快慢可能影响G.P.区的密度。对N-14样品不同放大倍数的高分辨象G.P.区线密度和面密度的统计值同样具代表性。文中设想了G.P.区出溶的假二元系相图。
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| 关 键 词： | 辉石 古铜辉石 样品 G.P区 |
A STUDY OF G.P. ZONES IN TWO ORTHOPYROXENES |
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| Huang Wankang.A STUDY OF G.P. ZONES IN TWO ORTHOPYROXENES[J].Acta Mineralogica Sinica,1989,9(2):104-111. |
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| Authors: | Huang Wankang |
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| Abstract: | The Guinier-Preston zones in two bronzites have been investigated: one is sample M-108 collected from a melagabbro intrusion, and the other N-14 separated from a gabbro xenolith in basalt.Electron micrograph of sample M-108 shows a higher number of G.P. zones per area being one unit-cell thick, while in sample N-14 the G.P. zones are two unit-cell thick.The line density and area density have been counted.Sample N-14 is similar to lunar sample 76535 with a rapid cooling history at low temperature and a complex thermal history.A possible pseudo-binary phase diagram of the pyroxene subsolidus is proposed. |
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| Keywords: | G P zone orthopyroxene gabbro xenolith |
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