铁闪长岩，角闪超群的一个新成员，来自瑞典Värmland Jakobsberg Mn–Fe矿床

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2022-10-12 DOI:10.5194/ejm-34-451-2022

D. Holtstam, F. Cámara, A. Karlsson, H. Skogby, T. Zack

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引用次数: 0

摘要

摘要铁钽铁矿（IMA CNMNC 2021-046），通常为ANaB（CaNa）C（Mg3Fe23+）（Si6Al2）O22W（OH。形成条件，接近峰值变形（约650年 ∘C和0.4 GPa），包括二氧化硅不饱和、轻微的过碱性和相对较高的氧逸度。铁钽铁矿形成高达5的变晶晶体 mmand呈深棕黑色，有黄灰色条纹。角闪石是脆性的，具有不均匀到碎裂的断裂。平行于{110}的解理是好的。硬度（Mohs）为～ 6，并且Dcalc=3.227（5） g 基于化学分析（EDS，激光烧蚀ICP-MS）和光谱（Mössbauer，红外）和单晶X射线衍射数据，Holotype ferri taramiteh的实验单位为formula A（Na0.79K0.16Pb0.01）∑0.96B（Ca1.26Na0.72Mn0.022+）∑2C（Mg2.66Mn0.582+Fe0.162+Zn0.02Fe1.263+Al0.26Ti0.06）∑5.00T（Al1.86Si6.14）∑8O22W（OH）2。该矿物具有光学双轴性（–），在白光中α=1.670（5）、β=1.680（5）和γ=1.685（5），2Vmeas=70（10）∘和2Vcalc=70.2 \8728。X射线粉末图案中的八个最强反射（d值（in Å），Irel，hkl）为8.44，60110；3.392，25131；3.281，39240；3.140100310；2.816，45330；2.7104、38151；1.3654，26461；和1.4451，33，6‾61。从单晶衍射数据中提取的晶胞参数为a=9.89596（13），b=18.015（2），c=5.32164（7） Å，β=105.003（13）∘和V=916.38（2） Å3表示Z=2。晶体结构的细化得到R=2.26 % 对于2722次Io>2σ（I）的反射。Mn2+和Fe2+离子显示出对M1和M3八面体平行配位位点的偏好，而Fe3+在M2处是强有序的。A基团阳离子K和Na分别分裂为两个子位点A（m）和A（2）。

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Ferri-taramite, a new member of the amphibole supergroup, from the Jakobsberg Mn–Fe deposit, Värmland, Sweden

Abstract. Ferri-taramite (IMA CNMNC 2021-046), ideally ANaB(CaNa)C(Mg3Fe23+)(Si6Al2)O22W(OH)2, occurs in skarn from the Jakobsberg manganese mine, Värmland, Sweden. Associated minerals are celsian, phlogopite, aegirine-augite, andradite, hancockite, melanotekite, microcline (var. hyalophane), calcite, baryte, prehnite, macedonite and oxyplumboroméite. Conditions of formation, close to peak metamorphism (at circa 650 ∘C and 0.4 GPa), include silica undersaturation, a slightly peralkaline character and relatively high oxygen fugacities. Ferri-taramite forms poikiloblastic crystals up to 5 mm and is dark brownish black with a yellowish grey streak. The amphibole is brittle with an uneven to splintery fracture. Cleavage parallel to {110} is good. Hardness (Mohs) is ∼ 6, and Dcalc=3.227(5) g cm−3. Holotype ferri-taramite has the experimental unit formula A(Na0.79K0.16Pb0.01)Σ0.96B(Ca1.26Na0.72Mn0.022+)Σ2C(Mg2.66Mn0.582+Fe0.162+Zn0.02Fe1.263+ Al0.26Ti0.06)Σ5.00T(Al1.86Si6.14)Σ8O22W(OH)2, based on chemical analyses (EDS, laser-ablation ICP-MS) and spectroscopic (Mössbauer, infrared) and single-crystal X-ray diffraction data. The mineral is optically biaxial (–), with α=1.670(5), β=1.680(5) and γ=1.685(5) in white light and 2Vmeas=70(10)∘ and 2Vcalc=70.2∘. Ferri-taramite is distinctly pleochroic in transmitted light, with X pale yellow, Y dark brown, Z yellowish brown and absorption Y>Z>X. The eight strongest reflections in the X-ray powder pattern (d values (in Å), Irel, hkl) are 8.44, 60, 110; 3.392, 25, 131; 3.281, 39, 240; 3.140, 100, 310; 2.816, 45, 330; 2.7104, 38, 151; 1.3654, 26, 461; and 1.4451, 33, 6‾61. Refined unit-cell parameters from single-crystal diffraction data are a=9.89596(13), b=18.015(2), c=5.32164(7) Å, β=105.003(13)∘ and V=916.38(2) Å3 for Z=2. Refinement of the crystal structure yielded R=2.26 % for 2722 reflections with Io>2σ(I). The Mn2+ and Fe2+ ions show preference for the M1 and M3 octahedrally coordinated sites, whereas Fe3+ is strongly ordered at M2. The A-group cations, K and Na, are split over two subsites, A(m) and A(2), respectively.

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.