Discovery of Li–bearing sodium amphibole from the Sanbagawa belt, Japan

IF 0.9 4区地球科学 Q4 MINERALOGY

Journal of Mineralogical and Petrological Sciences Pub Date : 2021-01-01 DOI:10.2465/jmps.200728

Y. Banno, Chihiro Fukuda, N. Shimobayashi, S. Yamada

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Abstract

Lithium – bearing sodium amphibole (Li 2 O = 0.01 – 1.02 wt%) was found in a specimen of schistose manganese ore from the Iimori region in the Sanbagawa metamorphic belt, central Japan. The ore is composed mainly of quartz, albite, amphibole, Na to Na – Ca pyroxene, and braunite. The amphibole occurs as prismatic crystals with lengths of up to 400 µm and consists of a pale – green core and an orange – red rim observed in hand specimen. The chemical formulae of averaged compositions of the core and rim, based on 24(O, OH, F, Cl) with (OH, F, Cl) = (2 − 2Ti) atoms per formula unit, are A (Na 0.468 K 0.448 ) Σ 0.916B (Na 1.586 Ca 0.393 Mn 2+0.021 ) Σ 2.000C (Mg 3.896 Mn 2+0.124 Fe 3+0.657 Al 0.182 Ti 0.031 Li 0.106 Cu 0.004 ) Σ 5.000T (Si 7.936 Al 0.064 ) Σ 8.000 O 22W [(OH) 1.771 F 0.167 O 0.062 ] Σ 2.000 and A (K 0.576 Na 0.428 ) Σ 1.004 B (Na 1.759 Ca 0.241 ) Σ 2.000C (Mg 3.143 Mn 2+0.332 Fe 3+0.782 Al 0.247 Mn 3+0.081 Ti Li Cu ) Si [(OH) O 0.106 ] Σ 2.000 , respectively. Consequently, the core amphibole has an intermediate composition between magnesio – arfvedsonite and potassic – magnesio – arfvedsonite, whereas the rim amphibole is potassic – magnesio – arfvedsonite.

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日本三川带含锂钠角闪洞的发现

在日本中部三川变质带Iimori地区的片状锰矿石中发现了含锂钠角闪孔(Li 2o = 0.01 ~ 1.02 wt%)。矿石主要由石英、钠长石、角闪洞、钠~钠钙辉石和褐灰岩组成。角闪孔以棱柱状晶体形式存在，长度可达400 μ m，由浅绿色的芯和橙红色的边缘组成。以(OH, F, Cl) =(2−2Ti)原子为单位，以24(O, OH, F, Cl)为基础，得到了核心和边缘平均组成的化学式;是0.448 (Na 0.468 K)Σ0.916 B (Na 1.586 Ca 0.393 Mn 2 + 0.021)Σ2.000摄氏度(3.896 Mn 2 + 0.124毫克铁3 + 0.657 0.182 Ti李0.031 0.106铜0.004)Σ5.000吨(参见Si 7.936 0.064)Σ8.000 O 22 w (F(哦)1.771 0.062 0.167 O)Σ2.000和0.428 (0.576 K Na)Σ1.004 B (Na 1.759 0.241 Ca)Σ2.000摄氏度(3.143 Mn 2 + 0.332毫克铁3 + 0.782 0.247 Mn 3 + 0.081 Ti李铜)如果[0.106 (OH) O]Σ2.000,分别。因此，角闪孔的核心是镁镁镁岩和钾镁镁钠岩的中间成分，而角闪孔的边缘是钾镁镁钠岩。

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来源期刊

Journal of Mineralogical and Petrological Sciences 地学-矿物学

CiteScore

1.80

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Mineralogical and Petrological Sciences (JMPS) publishes original articles, reviews and letters in the fields of mineralogy, petrology, economic geology, geochemistry, planetary materials science, and related scientific fields. As an international journal, we aim to provide worldwide diffusion for the results of research in Japan, as well as to serve as a medium with high impact factor for the global scientific communication Given the remarkable rate at which publications have been expanding to include several fields, including planetary and earth sciences, materials science, and instrumental analysis technology, the journal aims to encourage and develop a variety of such new interdisciplinary scientific fields, to encourage the wide scope of such new fields to bloom in the future, and to contribute to the rapidly growing international scientific community. To cope with this emerging scientific environment, in April 2000 the journal''s two parent societies, MSJ* (The Mineralogical Society of Japan) and JAMPEG* (The Japanese Association of Mineralogists, Petrologists and Economic Geologists), combined their respective journals (the Mineralogical Journal and the Journal of Mineralogy, Petrology and Economic Geology). The result of this merger was the Journal of Mineralogical and Petrological Sciences, which has a greatly expanded and enriched scope compared to its predecessors.