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Naquite, FeSi, a New Mineral Species from luobusha, Tibet, Western China

Acta Geologica Sinica(English Edition) 2012年第3期86卷 533-538页

作者： SHI Nlcheng BAI Wenji LI Guowu XIONG Ming YANG Jingsu MA Zhesheng RONG He Crystal Structure Laboratory China University ofGeosciencesBeijing 100083China Institute of Geology CAGSBeijing 100037China

A new mineral species, named naquite（FeSi）, is found in the podiform chromitites of the luobusha ophiolite in Qusong County, Tibet, China. The detailed composition is Fe 65.65, Si 32.57 and Al 1.78 wt%. The mineral is cubic, space group P213. The irregular crystals range from 15 to 50 μm in diameter and form an intergrowth with luobusaite. Naquite is steel grey in color, opaque, with a metallic lustre and gives a grayish-black streak. The mineral is brittle, has a conchoidal fracture and no apparent cleavage. The estimated Mohs hardness is 6.5, and the calculated density is 6.128 g/cm3. Unit-cell parameters are a 4.486 （4） A, V 90.28 （6）A^3, Z=4. The five strongest powder diffraction lines [d inA（hkl）（I/I0）] are： 3.1742 （110）（40）, 2.5917（111）（43）, 2.0076 （210）（100）, 1.8307 （211）（65）, and 1.1990 （321）（36）. Originally called ＇fersilicite＇, the species and new name have now been approved by the CNMNC （IMA 2010-010）.

关键词： new mineral fersilicite chromite luobusha ophiolite Tibet

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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 BAI Wenji YANG Jingsu RONG He SHI Nicheng LI Guowu XIONG Ming MA Zhesheng Institute of Geology CAGS X-ray Diffraction Laboratory 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 grayish 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 99.23-100.00 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）, 2.254（011）（100）, 1.730 （012）（16）, 1.478 （110）（21）, and 0.9464 （121）（8）. The species and name were approved by the CNMNC （IMA 2010-044）.

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

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Comparison of Redox States between the Ultramafic Bodies of Xigaze and luobusha ophiolites, Tibet, China

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 93-93页

作者： ZHU Xiangkun HE Yuan SHE Yuwei WAN Hongqing MNR Key Laboratory of Deep-Earth Dynamics MNR Key Laboratory of Isotope GeologyInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China

The tectonic setting of podiform chromitite formation still remains highly debated. There is a close correlation between tectonic settings and oxygen fugacity(fO2)(e.g., Ballhaus, 1993;Dare et al., 2009;Parkinson and Arculus, 1999). Here we present results of fO2 of chromites determined by M?ssbauer spectroscopy from both the luobusha and Dazhuqu areas along Yarlung Zangbo suture zone, Southern Tibet. The fO2 values(-1.02~0.04 log units against the FMQ buffer) and Cr#(22~54%) in chromites from lherzolites and harzburgites of both areas are similar to those of abyssal peridotites, indicating that they may be residues after partial melting at spreading centers. However, both dunite envelopes and chromitites from luobusha have high fO2 values(0.04~2.25 log units) and Cr#(73~84%), showing an affinity to boninitic melts, and thus form in a suprasubduction zone. Dazhuqu dunites show diverse fO2 values(-0.22~2.19 log units) and Cr#(22~82%), indicating that they form in distinct settings. Chromitites and chromite dunites from Dazhuqu have low fO2 values(-0.3~0.71 log units) and Cr#(16~63%), both of which are similar to those of MORB-like basalts, inferring that they form in an extensional setting. Both high-Cr and high-Al chromitites from other typical podiform chromite ore deposits, such as Kempirsai, Oman, and Albania ophiolites, also show high fO2 values(e.g., Chashchukhin and Votyakov, 2009;Melcher et al., 1997;Quintiliani et al., 2006;Rollinson and Adetunji, 2015), while the distribution-limited small chromitites and chromite dunites from Dazhuqu exhibit low fO2 values. The phenomenon infers that the suprasubduction zone is more beneficial to the formation of podiform chromitites.

关键词： ultramafic bodies redox states tectonicsetting Xigaze ophiolite luobusha ophiolite

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