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Silicon-rutile - an ultra-high pressure (UHP) mineral from an ophiolite

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Progress in Natural Science:materials International 2003年第7期 50-53页

作者： yang jingsui , bai wenji, fang qingsong, yan binggang, shi nicheng, ma zhesheng, dai mingquan and xiong ming (1. Institute of Geology, Chinese Academy of Geological sciences, beijing 100037, china 2. Geological University of china, beijing 100083. china) Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Geological University of china Beijing 100083 China

Silicon(Si)-rutile separated from the Luobusa podiform chromitite in the Yarlung Zangbo ophiolite of southern Tibet is typically about 50 μm × 50 μm × 2.0 μm in size and consists mainly of SiO2.and TiO2. The average mineral formula is (Ti0. 82.i0.18)O2. Powder x-ray {2. data show that it is tetragonal in form, and the unit cell dimensions and other parameters are: α= 4. 591(2. A , c = 2.946(2.A, v=62.09(5)A3, c/α=0.6415, with a molar volume about 5 % smaller than rutile (JCPDS, 2.-12.6). The Si4 + ions in silicon rutile are six-coordinated, and are substituted for Ti + in the rutile structural sites. The Si-rutile, along with other associated ultra-high minerals discovered in the chromitite, such as octahedral silicate, silicon-magnesium spinel (Si4+ ions are six-coordinated), diamond, and intergrown of SiO2.and FeO phases, probably originated from the transition zone or the lower mantle, and were brought to shallow levels beneath an oceanic spreading ridge by an upwelling superplurne.

关键词： Si-rutile UHP minerals ophiolite lower mantle chromitite.

Titanium, Ti, A New Mineral Species from Luobusha, Tibet, china

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Acta Geologica Sinica(English Edition) 2013年第5期87卷 1275-1280页

作者： fang qingsong {2. wenji yang Jingsu RONG He shi nicheng LI Guowu xiong ming ma zhesheng Institute of Geology CAGS x-ray diffraction {2. China University of Geosciences

We describe the new mineral species titanium, ideally Ti, found in the podiform chromitites of the Luobusha ophiolite in Tibet, People＇s Republic of china. The irregular crystals range from 0.1 to 0.6 mm in diameter and form an intergrowth with coesite and kyanite. Titanium is silver grey in colour, the luster is metallic, it is opaque, the streak is g{2.ish black, and it is non-fluorescent. The mineral is malleable, has a rough to hackly fracture and has no apparent cleavage. The estimated Mohs hardness is 4, and the calculated density is 4.503 g/cm3. The composition is Ti 99.2.-100.00 wt%. The mineral is hexagonal, space group P6flmmc. Unit-cell parameters are a 2.950 （2. ~, c 4.686 （1） A,V 35.32.（5） A3, Z = 2. The five strongest powder diffraction lines [d in A （hkl）（I/I0）] are： 2.569 （010）（32., 2.2.4（011）（100）, 1.730 （012. （16）, 1.478 （110）（2.）, and 0.9464 （12.）（8）. The species and name were approved by the CNMNC （Ima 2.10-044）.

关键词： Titanium new mineral species Ti chromitite Luobusha ophiolite Tibet

Yarlongite:A New Metallic Carbide Mineral

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Acta Geologica Sinica(English Edition) 2009年第1期83卷 52-56页

作者： shi nicheng {2. wenji LI Guowu xiong ming fang qingsong yang jingsui ma zhesheng RONG He x-ray laboratory China University ofGeosciences Beijing 100083 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

Yarlongite occurs in ophiolitic chromitite at the Luobusha mine （2.°5′N 92.5′E, about 2.0 km ESE of Lhasa）, Qusum County, Shannan Prefecture, Tibet Autonomous Region, People＇s Republic of china. Associated minerals are： diamond, moissanite, wiistite, iridium （＂osmiridium＂）, osmium （＂iridosmine＂）, periclase, chromite, native iron, native nickel, native chromium, forsterite, Cr-rich diopside, intermetallic compounds Ni-Fe-Cr, Ni-Cr, Cr-C, etc. Yarlongite and its associated minerals were handpicked from a large heavy mineral sample of chromitite. The metallic carbides associated with yarlongite are cohenite, tongbaite, khamrabaevite and qusongite （I{2.2.07-034）. Yarlongite occurs as irregular grains, with a size between 0.02.and 0.06 mm, steel-grey colour, H Mohs： 5^1/2.6. Tenacity： brittle. Cleavage：（0 0 1） perfect. Fracture： conchoidal. Chemical formula：（Cr4Fe4Ni）2.C4, or （Cr,Fe,Ni）2.C4, Crystal system： Hexagonal, Space Group： P63/mc, a = 18.839（2. A, c = 4.4960 （9） A, V = 745.7（2. A^3, Z = 6, Density （calc.） = 7.19 g/cm3 （with simplified formula）. Yariongite has been approved as a new mineral by the CNMNC （I{2.2.07-035）. Holotype {2.terial is deposited at the Geological Museum of china （No. Ml1650）.

关键词： yarlongite new mineral metallic carbides ophiolite luobusha Tibet

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雅鲁矿：一种金属碳化物新矿物

地质学报 2009年第1期83卷 25-30页

作者：施倪承白文吉李国武熊明方青松杨经绥马喆生戎合中国地质大学x射线衍射实验室北京100083 中国地质科学院地质研究所北京100037

雅鲁矿产于中国西藏曲松县罗布莎蛇绿岩铬铁矿山中（2.°5′N，92.5′E，拉萨市东南约2.0公里处）。伴生矿物有金刚石、碳硅石、方铁矿、饿铱矿、铱锇矿（自然锇）、方镁石、铬铁矿等。与雅鲁矿伴生的金属碳化物有桐柏矿、陨碳铁矿、... 详细信息

雅鲁矿产于中国西藏曲松县罗布莎蛇绿岩铬铁矿山中（2.°5′N，92.5′E，拉萨市东南约2.0公里处）。伴生矿物有金刚石、碳硅石、方铁矿、饿铱矿、铱锇矿（自然锇）、方镁石、铬铁矿等。与雅鲁矿伴生的金属碳化物有桐柏矿、陨碳铁矿、钛碳矿和曲松矿（Ima2.07—034）。雅鲁矿及其伴生矿物都是从人工重砂大样中经选矿富集后得到的。该矿物为不规则粒状，粒径2.～60μm，钢灰色，不透明。莫氏硬度：5．5～6，性脆{001}解理完全，贝壳状断口。化学分子式为：（Cr4Fe4Ni）∑9C4，或（Cr,Fe，Ni）∑9C4。六方晶系，空间群：P63／mc，a=18．839（2.A，c＝4．4960（9）A，V＝745．7（2.A3，Z＝6，计算密度：7．19g／cm^3。雅鲁矿己被国际新矿物命名及矿物分类委员会（CNMMNC）批准为新矿物（Ima2.07—035），样品（M11650号）保存在中国地质博物馆。

关键词：雅鲁矿新矿物金属碳化物蛇绿岩西藏罗布莎