气候变化领域集成服务门户(CCPortal): Wenjiite, Ti10(Si,P,□)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China

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DOI	10.2138/am-2022-8226
	Wenjiite, Ti10(Si,P,□)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China
	Xiong, Fahui; Xu, Xiangzhen; Mugnaioli, Enrico; Gemmi, Mauro; Wirth, Richard; Yang, Jingsui; Grew, Edward S.
发表日期	2023
ISSN	0003-004X
EISSN	1945-3027
起始页码	197
结束页码	210
卷号	108 期号:1
英文摘要	The new minerals wenjiite, Ti-10(Si,P,square)(7) (IMA2019-107c) and kangjinlaite, Ti-11(Si,P)(10) (IMA2019-112b) occur with badengzhuite, zhiqinite, and a K-bearing dmisteinbergite-like mineral in a spheroid 20 mu m across enclosed in corundum from the Cr-11 podiform chromitite orebody near the Kangjinla, Luobusa ophiolite, Tibet, China. In addition, wenjiite occurs with deltalumite, jingsuiite, osbornitekhambaraevite, and the K-bearing dmisteinbergite-like mineral in a lamellar intergrowth 100 mu m long, also enclosed in corundum from the same locality. The new minerals were characterized by energy-dispersive spectroscopy and three-dimensional electron diffraction, which enabled us to obtain an ab initio structure solution and dynamical refinement from grains a few micrometers across hosted in a FIB lamella. Four analyses of wenjiite from the spheroid gave in wt% Si 21.67, P 6.24, Ti 66.39, V 1.37, Cr 2.20, Mn 0.97, and Fe 1.17 (normalized to 100), which corresponds to (Ti0.93Cr0.03Mn0.01Fe0.01V0.02)(10) (Si0.79P0.21)(6.51) on the basis of 10 cations excluding Si and P. The simplified formula is Ti-10(Si,P)(6.5), or more generally Ti10SixPy, where x > y and 6 <= (x + y) <= 7, i.e., Ti-10(Si,P,square)(7). Wenjiite has hexagonal symmetry, space group: P63/mcm (no. 193), with a = 7.30(10) angstrom, c = 5.09(10) angstrom, V = 235(6) angstrom(3), Z = 1, and is isostructural with xifengite, mavlyanovite, synthetic Ti5Si3, and synthetic Ti5P3.15. Four analyses of kangjinlaite gave in wt% Si 25.56, P 9.68, Ti 62.35, V 0.21, Cr 0.83, Mn 0.42, and Fe 0.95 (normalized to 100), which corresponds to (Ti10.65V0.03Cr0.13Mn0.06Fe0.14)(Sigma 11.01)(Si7.43P2.55)(Sigma 9.99). The simplified formula is Ti-11(Si,P)(10). Kangjinlaite is tetragonal, with space group: I4/mmm (no. 139), a = 9.4(2) angstrom, c = 13.5(3) angstrom, V = 1210(50) angstrom(3), Z = 4, and is isostructural with synthetic compounds of the Ho11Ge10 type, being the most compact of these phases. Despite there now being over 70 compounds containing 38 elements isostructural with Ho11Ge10, synthesis of an analog of kangjinlaite has not been previously reported in either the Ti-P or Ti-Si binary systems or in a multicomponent system. The previously deduced crystallization sequence with decreasing temperature of the four minerals in the spheroid is wenjiite -> kangjinlaite -> zhiqinite + badengzhuite. This sequence is consistent with relationships reported in 9 binary systems containing intermetallic compounds of Ge and Sn isostructural with Mn5Si3 and Ho11Ge10. In eight of these systems the Mn5Si3 analog melts congruently, whereas the Ho11Ge10 analog never does. Instead, the Ho11Ge10 analog melts peritectically, generally to an Mn5Si3 analog and less commonly to compounds with 5:4 stoichiometry. Final crystallization of the spheroid to zhiqinite + badengzhuite is expected to be well below the temperature of 1500 degrees C for the congruent melting of zhiqinite in the Ti-Si system, i.e., in the range of similar to 1100-1300 degrees C.
关键词	Luobusa chromitite wenjiite kangjinlaite intermetallic melts crystal structure transmitting electron microscopy three-dimensional electron diffraction
英文关键词	ELECTRON-DIFFRACTION TOMOGRAPHY; ION-BEAM FIB; CRYSTAL-STRUCTURE; PHASE-DIAGRAM; CHROMITITE OREBODY; THERMODYNAMIC ASSESSMENT; SUBSTITUTION VARIANT; PODIFORM CHROMITITE; MAGNETIC-PROPERTIES; SOLID-STATE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000923813700017
来源期刊	AMERICAN MINERALOGIST
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283423
作者单位	China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; Ministry of Natural Resources of the People's Republic of China; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Guangzhou); Istituto Italiano di Tecnologia - IIT; Helmholtz Association; Helmholtz-Center Potsdam GFZ German Research Center for Geosciences; Nanjing University; University of Maine System; University of Maine Orono
推荐引用方式 GB/T 7714	Xiong, Fahui,Xu, Xiangzhen,Mugnaioli, Enrico,et al. Wenjiite, Ti10(Si,P,□)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China[J],2023,108(1).
APA	Xiong, Fahui.,Xu, Xiangzhen.,Mugnaioli, Enrico.,Gemmi, Mauro.,Wirth, Richard.,...&Grew, Edward S..(2023).Wenjiite, Ti10(Si,P,□)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China.AMERICAN MINERALOGIST,108(1).
MLA	Xiong, Fahui,et al."Wenjiite, Ti10(Si,P,□)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China".AMERICAN MINERALOGIST 108.1(2023).