Schorl-1A from Langesundsfjord (Norway)

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geosciences Pub Date : 2022-09-27 DOI:10.3190/jgeosci.344

F. Câmara, F. Bosi, H. Skogby, U. Hålenius, B. Celata, M. Ciriotti

引用次数: 1

Abstract

A crystal fragment of schorl from Langesundsfjord (Norway), showing a zonation with a biaxial optic behavior in the rim, was studied by electron microprobe analysis, single-crystal X-ray diffraction, Mössbauer, infrared and optical absorption spectroscopy and optical measurements. Measured 2 V x is 15.6°. We concluded that biaxial character of the sample is not due to internal stress because it cannot be removed by heating and cooling. Diffraction data were refined with a standard R 3 m space group model, with a = 16.0013(2) Å, c = 7.2263(1) Å, and with a non-conventional triclinic R 1 space-group model keeping the same hexagonal triple cell ( a = 16.0093(5) Å, b = 16.0042(5) Å, c = 7.2328(2) Å, α = 90.008(3)°, β = 89.856(3)°, γ = 119.90(9)°), yielded R all = 1.75% (3136 unique reflections) vs. R all = 2.

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Langesundsfjord的Schorl-1A（挪威）

利用电子探针分析、单晶x射线衍射、Mössbauer、红外光谱和光学吸收光谱以及光学测量等手段，对挪威Langesundsfjord的schorl晶体片段进行了研究。测得2v x为15.6°。我们得出结论，样品的双轴特性不是由于内应力，因为它不能通过加热和冷却去除。采用标准的r3 m空间群模型(a = 16.0013(2) Å， c = 7.2263(1) Å)对衍射数据进行精化，采用非常规的三斜r1空间群模型(a = 16.0093(5) Å， b = 16.0042(5) Å， c = 7.2328(2) Å， α = 90.008(3)°，β = 89.856(3)°，γ = 119.90(9)°)，得到rall = 1.75%(3136个唯一反射)，rall = 2。

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

Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY

CiteScore

2.30

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.