Olivine Megacrysts in Alkaline Basalt Dikes of the Western Sangilen Region, Southeastern Tuva

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Doklady Earth Sciences Pub Date : 2024-04-19 DOI:10.1134/s1028334x24601585

A. E. Izokh, V. V. Egorova, R. A. Shelepaev, Ya. Yu. Shelepov

引用次数: 0

Abstract

Large (up to 4 cm) crystals of euhedral olivine and its intergrowths with clinopyroxene were discovered in the alkali–basaltoid dikes of the Western Sangilen region, Southeastern Tuva. The composition of olivine megacrysts (81–83 at % Mg#, 0.2–0.3 wt % NiO) is drastically different from that of olivines in mantle and gabbroid parageneses. Olivine is a liquidus phase crystallized from an alkaline basaltic melt at a pressure of 10–13 kbar in intermediate magma chambers located at a depth of 34–43 km corresponding to the level of the crust–lithospheric mantle boundary in the Western Sangilen region.

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图瓦东南部西桑吉伦地区碱性玄武岩岩峰中的橄榄石巨晶

摘要在图瓦东南部 Western Sangilen 地区的碱性-玄武质岩穴中发现了大块（长达 4 厘米）橄榄石晶体及其与烊辉石的互生体。橄榄石巨晶的成分（81-83% Mg#，0.2-0.3 wt % NiO）与地幔和辉长岩副成岩中的橄榄石截然不同。橄榄石是碱性玄武岩熔体在 10-13 千巴的压力下，在位于西桑吉伦地区 34-43 千米深处（相当于地壳-岩石圈-地幔边界水平）的中间岩浆室中结晶而成的液相。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.