介绍来自伊朗西部哈梅丹Alvand综合体的半宝石级蓝色刚玉

IF 1.2 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Periodico Di Mineralogia Pub Date : 2021-01-26 DOI:10.13133/2239-1002/17315

Fariba Sajjadi Alehashem, M. Moazzen, A. Jahangiri

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引用次数: 2

摘要

伊朗西部Alvand火成变质杂岩的正长伟晶岩脉中形成了半宝石级刚玉晶体。堤坝被火成岩和周围的角砾岩侵入。刚玉主要与岩石中的钾长石有关，形成直径为2至60毫米的晶体。它显示灰色、蓝灰色、淡蓝色、墨蓝色和深蓝色。在手标本和显微镜下，晶体显示出颜色分区和类似trapiche的分区。刚玉晶体中的主要矿物相包裹体是白云母、金云母、铁素体和铌钽氧化物。LA-ICP-MS和电子探针分析表明，所分析的晶体的Fe/Mg、Fe/Ti、Ti/Mg和Ga/Mg比率范围很宽，而Cr/Ga比率的变化有限。高Fe和Ga以及低Mg和Cr含量表明这些球茎的岩浆成因。Ti含量是控制颜色的主要因素。

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Introducing Semi-gem quality blue corundum from the Alvand complex, Hamedan, west Iran

Semi-gem quality corundum crystals are formed in a syenite pegmatite dyke in the Alvand igneous-metamorphic complex in west Iran. The dyke is intruded the igneous rocks and the surrounding hornfelses. Corundum is mainly associated with K-feldspar in the rocks and makes crystals 2 to 60 mm across. It shows gray, bluish-gray, pale blue, ink blue and dark blue colours. The crystals show colour zoning and trapiche-like zoning in hand specimens and under the microscope. The main mineral phase inclusions in corundum crystals are muscovite, phlogopite, hercynite and Nb-Ta oxides. LA-ICP-MS and electron microprobe analyzes indicate wide range of Fe/Mg, Fe/Ti, Ti/Mg and Ga/Mg ratios for the analyzed crystals while variation of Cr/Ga ratio is limited. The high Fe and Ga and low Mg and Cr contents suggest a magmatic origin for these corundums. Ti content was found as the main factor controlling the colour.

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来源期刊

Periodico Di Mineralogia 地学-地球化学与地球物理

CiteScore

1.50

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Periodico di Mineralogia is an international peer-reviewed Open Access journal publishing Research Articles, Letters and Reviews in Mineralogy, Crystallography, Geochemistry, Ore Deposits, Petrology, Volcanology and applied topics on Environment, Archaeometry and Cultural Heritage. The journal aims at encouraging scientists to publish their experimental and theoretical results in as much detail as possible. Accordingly, there is no restriction on article length. Additional data may be hosted on the web sites as Supplementary Information. The journal does not have article submission and processing charges. Colour is free of charges both on line and printed and no Open Access fees are requested. Short publication time is assured. Periodico di Mineralogia is property of Sapienza Università di Roma and is published, both online and printed, three times a year.