Luobusaite： A New Mineral   总被引：6，自引：0，他引：6  

BAI Wenji SHI Nicheng FANG Qingsong LI Guowu XIONG Ming YANG Jingsui RONG He 《《地质学报》英文版》2006,80(5):656-659

A group of mantle minerals including about 70-80 subtypes of minerals are discovered from a podiform chromitite in Tibet, China. Recovered minerals include diamond, coesite, moissanite, wustite, Fe-silides and a new mineral, luobusaite. All of these minerals were hand-picked from heavymineral separates of the podiform chromitite in the mantle peridotite of an ophiolite. The grains of luobusaite are as host mineral with inclusions of native silicon or as an intergrowth with native silicon and Fe-Si phase. Luobusaite occurs as irregular grains, with 0.1-0.2 mm in size, consisting of very finegrained aggregates. The mineral is steel-grey in color, metallic luster, and opaque. The empirical formula （based on 2 for Si） is Fe0.83Si2, according to the chemical compositions of luobusaite. X-ray powder-diffraction data： orthorhombic system, space group Cmca, a = 9.874 （14） A, b = 7.784 （5） A, c= 7.829（7） A, Z=16.  相似文献   

Bashikaogong-Shimierbulake granitic complex, north Altun, NW China:Geochemistry and zircon SHRIMP ages   总被引：6，自引：0，他引：6  

Joseph L. Wooden  Frank K. Mazdab 《中国科学D辑(英文版)》2006,49(12):1233-1251

The Bashikaogong-Shimierbulake granitoid complex is about 30 km long and 2―6 km wide, with an area of 140 km2, located at the north margin of the Bashikaogong Basin in the north Altun terrain. It intruded into schist, metapelite and metatuff of Precambrian ages. This granitoid complex consists of darkish quartz diorite, grey granite, pink granite and pegmatite. Geochemically, the quartz diorite has I-type granite affinity and belongs to Calc-alkaline sereies, and the other gran- ites have S-type affinity and to high-K calc-alkaline series. Zircon SHRIMP U-Pb dating shows that the quartz diorite has a bigger age than those of other granites, which is 481.6±5.6 Ma for quartz diorite, 437.0±3.0 Ma―433.1±3.4 Ma for grey granite and 443±11 Ma―434.6±1.6 Ma for pink granite, re- spectively. Combined with regional geology, we think that the quartz diorite formed in tectonic envi- ronment related to oceanic crust subduction and the granites in post-collision.  相似文献   

Kalaymyo Peridotite Massif in the Indo-Myanmar Ranges (western Myanmar): its mineralogy, geochemistry and tectonic implications     

NIU Xiaolu  LIU Fei  YANG Jingsui  Yildirim DILEK 《《地质学报》英文版》2018,92(Z2):23-23

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序——再论大陆动力学发展面临的重大挑战     

许志琴  杨经绥  朱文斌 《地质学报》2021,95(1)

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Geochronology and Geochemistry of the Subduction-related Rocks with High Sr/Y Ratios in the Zedong Area: Implications for the Magmatism in Southern Lhasa Terrane during Late Cretaceous     

CHEN Yanhong  YANG Jingsui  XIONG Fahui  ZHANG Lan  LAI Shengmin  CHEN Mei 《《地质学报》英文版》2015,89(2):351-368

The southern Lhasa Terrane is famous for its huge magmatic belt which records the magmatism during Mesozoic and Cenozoic. Although the Mesozoic continental-margin setting in the southern Lhasa Terrane has been identified,details of this tectonic setting and the evolution history during the Late Cretaceous remain unclear. To further constrain these issues,we present zircon LA-ICP-MS U-Pb,Hf isotopic and geochemical data of the Gongbari dacites(of the Sangri Group) which intruded by Paleocene granodiorites from the eastern part of the southern Lhasa Terrane,Tibet. New age data indicate that the dacites were generated at ~95.4 Ma,which suggests the Sangri Group volcanism may last to Late Cretaceous. The Gongbari dacites are characterized by high Sr(428–758 ppm) contents,low concentration of heavy rare earth elements and Y(e.g. Yb=0.78–1.14 ppm; Y=8.85–11.4 ppm) with high Sr/Y(41.91–67.59) and La/Yb(22.64–30.64) ratios,similar to those of adakite. The rocks are calc-alkaline,metaluminous,enriched in LILEs,depleted in HFSEs,and have positive εHf(t) values(+7.7 to +11.6). The Gongbari dacites were probably produced by partial melting of young and hot subducted Neo-Tethyan oceanic crust under amphibolite to garnet amphibolite-facies conditions. Though the Gangdese Mountains may have formed before Indo-Asian collision,the southern margin of Lhasa Terrane might not go through obviously crustal thickening during the northward subduction of NeoTethyan oceanic lithosphere.  相似文献   

Petrological and Metamorphic Evolution Study of the Staurolite-bearing Garnet Amphibolite in the Nyingchi Complex of the Lhasa Block     

HUANG Jie  ZHANG Cong  YANG Jingsui  CHEN Mei  SHENG Tingting 《《地质学报》英文版》2015,89(Z2):28-29

<正>1 Introduction Metamorphosed mafic rocks in orogenic belts usually involve high-variance assemblages which are stable very large regions of pressure(P)–temperature(T)and compositional(X)space.In particular,amphibolite facies mafic rocks typically contain similar assemblages:  相似文献   

Crustal Structure of the Indus-Tsangpo Suture Zone and its Ophiolites, Southern Tibet   总被引：1，自引：0，他引：1  

XU Zhiqin  DILEK Yildrim  YANG Jingsui  LIANG Fenghu  LIU Fei  BA Dengzhu  CAIZhihui  LI Guangwei  DONG Hanwen 《《地质学报》英文版》2015,89(Z2):103-103

<正>The2000-km-long Indus-Tsangpo suture zone(ITSZ)in southern Tibet marks the boundary between the India and Eurasia plates and contains the remnants of the Neotethyan oceanic lithosphere,ophiolitic mélanges,flysch units and continental rocks.Field-based structural analyses and drill core observations from the Luobusa  相似文献   

Zircon LA-ICP-MS U-Pb Dating of Listwanite from Baer Ophiolite, Yarlung- Zangbo Suture Zone, Implications for the Indus-Eurasia Collision     

ZHANG Lan  YANG Jingsui  ZHANG Jian 《《地质学报》英文版》2015,89(Z2):115-116

<正>1 Introduction Listwanite is a suite of silica-carbonate alteration products formed when CO2-bearing hydrothermal fluids meet and react with serpentinized mafic and ultramafic rocks(Robinson et al.,2005).This alteration product is of great economic significance.Gold,mercury,magnesite and base metal deposits are often associated with  相似文献   

Mineralogy of Purang Ophiolite Peridotites, Western Part of Yarlung-Zangbo Suture Zone (YZSZ), Southern Tibet     

ZHOU Wen  YANG Jingsui  ZHAO Junhong  XIONG Fahui  LIANG Fenghu  LIU Fei 《《地质学报》英文版》2015,89(Z2):124-124

<正>The Purang ophiolite is a large mantle peridotite massif ca.600 km~2 in area.The mantle peridotite is composed dominantly of harzburgite,lherzolite and minor dunite.The Fo and NiO contents of olivine in the peridotites are in the range of 89.5~92.8 and 0.23~0.44 wt.%,respectively;both of these parameters increase gradually  相似文献   

Petrogenesis of Peridotites from the Purang Ophiolite in Western Part of Yarlung-Zangbo Suture Zone, Southern Tibet     

ZHOU Wen  YANG Jingsui  ZHAO Junhong  MA Changqian  XIONG Fahui  XUXiangzhen  CHEN Yanhong  TIAN Yazhou 《《地质学报》英文版》2015,89(Z2):125-126

<正>Peridotites are an important part of ophiolites:they not only record plate tectonic settings and events,but also offer help to interpret the composition of the mantle and the effect of the deep mantle.The Yarlung-Zangbo suture zone extends more than 2000 km along southern Tibet,which is the biggest suture zone in China.The western  相似文献