Occurrence of quench olivine crystals in a basaltic dyke from Schirmacher Oasis, Queen Maud Land, East Antarctica

被引：0

作者：

Jafri, SH ^{[1
]}

Moeen, S ^{[1
]}

Charan, SN ^{[1
]}

Narayana, BL ^{[1
]}

Rao, VD ^{[1
]}

机构：

[1] Natl Geophys Res Inst, Hyderabad 500007, Andhra Pradesh, India

来源：

JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA | 2002年 / 60卷 / 01期

关键词：

basaltic dyke; quench olivine crystals; petrography; geochemistry; Schirmacher Oasis; East Antarctica;

D O I：

暂无

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Presence of several morphologies of quench olivine crystals, which provide important clues on cooling rate(s) of magma, are reported here in a basaltic dyke, from the Precambrian gneissic terrain of Schirmacher Oasis, Queen Maud Land, East Antarctica. The dyke, composed of plagioclase, clinopyroxene, olivine, magnetite and glass, shows intergranular texture. It is alkali basalt in composition with low silica (SiO2 = 46.20-47.20) and negative Nb anomaly. The morphologies of quench olivine crystals suggest rapid cooling of the basaltic magma approximately at 15-80degreesC/hour. Further, the delicate nature of these quench olivine crystals, confined mostly to the glassy margins of the dyke, also suggest in situ crystallisation.

引用

页码：67 / 74

页数：8

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