【摘 要】
：
Purang ultramafic complex of western Tibet consists of spinel peridotites,olivine websterite,rodingite and later intruded gabbro-diabase veins.The spinel peridotites consist of lherzolite,harzburgite
【机 构】
：
Shandong University of Science and Technology,Qingdao,266590,China
【出 处】
：
International Workshop on: Ophiolites, Mantle Processes and
论文部分内容阅读
Purang ultramafic complex of western Tibet consists of spinel peridotites,olivine websterite,rodingite and later intruded gabbro-diabase veins.The spinel peridotites consist of lherzolite,harzburgite and dunite.All Purang peridotites are rich in MgO,but depleted in Al2O3,CaO and TiO2 relative to primary mantle values,indicating depletion by several episodes of partial melting.The olivine websterite probably formed by melt/rock reaction between an evolved basaltic melt and harzburgite or dunite.The evolution of the Purang ultramafic rocks from lherzolite through harzburgite,and dunite to olivine websterite indicates multistage melting and melt/rock reaction processes.Decompression-related textures such as exsolution lamellae of clinopyroxene and spinel in orthopyroxene,and melting,melt/rock textures such as embayed,flame-like grains of spinel and partial chain spinel textures are widespread in the ultramafic rocks.Impregnation textures are reflected by the presence of late intergranular and interstitial clinopyroxene in the harzburgite,dunite and olivine websterite.Bulk rock chemistry and minerlaogical chemistries of the spinel,clinopyroxene and orthopyroxene all recorded both abyssal/back arc basin and supra-subduction zone affinity.
其他文献
With a focus on the results of direct N-body simulations performed on GRAPE and GPU special-purpose hardware,the current status of models applicable to studying globular cluster evolution will be revi
Even though globular clusters(GCs)have long been considered prototypical simple spherical systems,their origin is still strongly debated.Internal kinematics,acting as fossil record of the formation pr
It is widely accepted that the distribution function of the masses of young star clusters is universal and can be purely interpreted as a probability density distribution function with a constant uppe
I present an overview of the main observational properties of Blue Straggler Stars(BSSs)in Galactic Globular Clusters(GCs)in the framework of using this “exotic” stellar population as probe of GC inte
Narrow-line Seyfert 1(NLS1)galaxies are a sub-class of AGN with relatively lowmass black holes,accreting near the Eddington rate.A small fraction of them is radio-loud and harbors relativistic jets.RX
One of the key questions of modern physics concerns the possibility that physical constants vary over space and time during the history of the universe.The Standard Model of physics is built on these
The main aim of this article is to verify the structure of advection-dominated accretion flows(ADAFs)along the θ direction when bathed in a toroidal magnetic field.We use spherical coordinates to solv
A standard correlation between the radio and X-ray luminosity,i.e.LR∝L~0.5-0.7Xwas found in the low/hard spectral state of black hole X-ray binaries.However,recently a growing number of sources,called
High-and ultrahigh-pressure(UHP)eclogite-bearing metamorphic assemblages in the North Tianshan of Kyrgyzstan contain eclogite-bearing garnet amphibolites interlayered with phengite-beearing granitoid
Sutures mark places where oceans have closed and two once widely separated terranes have collided.Sutures are defined on the basis of geological relationships,and differences in the geologic,structura