塔吉克斯坦Dara-i-Pioz地块土耳其斯坦石的晶体化学

IF 2.8 3区地球科学 Q2 MINERALOGY

Mineralogical Magazine Pub Date : 2023-01-19 DOI:10.1180/mgm.2023.3

E. Kaneva, T. Radomskaya, O. Belozerova, R. Shendrik

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引用次数: 1

摘要

摘要报道了塔吉克斯坦天山Dara-i-Pioz矿床土耳其锡矿晶体的单晶X射线衍射、电子探针显微分析、傅立叶显微光谱和光致发光光谱研究结果。它是一种单层片状硅酸盐，属于埃卡岩组，具有稳定结构类型。提供的平均主元素分析（wt.%）：K2O 4.13（6），CaO 8.1（1），Na2O 2.3（1）、ThO2 25.8（4）、UO2 3.6（4）和SiO2 55.9（1）。所研究的土耳其锡矿的平均晶体化学式为（Th0.84U0.12）∑0.96（Ca1.24Na0.65）∑1.89（K0.75☐0.25）∑1.00Si8O19.72（OH）0.28。火鸡锡矿的单晶结构细化得到四方晶系，空间群P4/mcc，a=7.5708（3）Å，c=14.7300（11）Å、V=844.27（6）Å3和Z=2。在土耳其锡矿中观察到铀酰离子（UO2）2+的发光。在激发光谱中，发现了对应于从配体的2p态到铀的5f态的电荷转移跃迁的谱带。

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Crystal chemistry of turkestanite, Dara-i-Pioz massif, Tajikistan

Abstract The results of combined single-crystal X-ray diffraction, electron probe microanalysis, Fourier microspectroscopy, and photoluminescence spectroscopy study of crystals of turkestanite from the Dara-i-Pioz deposit, Tien-Shan Mountains, Tajikistan are reported. It is a single-layer sheet silicate belonging to the ekanite group with a steacyite structural type. Averaged major-element analysis provided (wt.%): K2O 4.13(6), CaO 8.1(1), Na2O 2.3(1), ThO2 25.8(4), UO2 3.6(4) and SiO2 55.9(1). The averaged crystal-chemical formula for the studied turkestanite is (Th0.84U0.12)Σ0.96(Ca1.24Na0.65)Σ1.89(K0.75☐0.25)Σ1.00Si8O19.72(OH)0.28. Single-crystal structural refinement of turkestanite gave tetragonal, space group P4/mcc, a = 7.5708(3) Å, c = 14.7300(11) Å, V = 844.27(6) Å3 and Z = 2. Luminescence of the uranyl ion (UO2)2+ is observed in turkestanite. In the excitation spectrum, the bands corresponding to a charge transfer transition from the 2p states of the ligand to the 5f state of uranium were found.

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来源期刊

Mineralogical Magazine 地学-矿物学

CiteScore

4.00

自引率

25.90%

发文量

104

审稿时长

6-12 weeks

期刊介绍： Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.