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国家重点基础研究发展计划(G1999075501)

作品数:10 被引量:96H指数:6
相关作者:金淑燕叶凯金振民宋衍茹章军锋更多>>
相关机构:中国地质大学中国科学院更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金美国国家自然科学基金更多>>
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Quartz and clinoenstatite exsolutions in clinopyroxene of garnet-pyroxenolite from the North Dabie Mountains,eastern China
The exsolution lamellae of quartz and clinoen-statite are idenfied in diopside of garnet-pyroxenolite from the...
SU Wen~(1,2),YOU Zhendong~3,WANG Rucheng~2 & LIU Xianwen~3 1.Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China
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Coesite inclusions in zircon from gneisses identified by laser Raman microspectrometer in ultra-high pressure zone of Dabie Mountains,China被引量:22
2001年
The mineral inclusions in zircon from gneisses in ultra-high pressure (UHP) zone of the Dabie Mountains were identified by using a laser Raman microspectrometer. Coesite occurs as inclusions in zircons from all types of gneiss. Other important minerals, such as jadeite, omphacite, aragonite, barite, and anhydrite were also found as inclusion minerals. These discoveries indicate that ( i) gneissic country rocks had metamorphosed at the same time as the enclosed eclogites; and (ii) SO4-2 -bearing fluids were presentin the UHP metamorphic process, which is manifested by occurrence of barite and anhydrite coexisting with coesite.
LIU JingboYE KaiCONG BolinMaruyama ShegnoriFAN Hongrui
关键词:闰土回回
苏鲁-大别山超高压变质带迟家店和碧溪岭石榴二辉橄榄岩橄榄石组构
大别山碧溪岭和山东荣成分别发育壳源和幔源的石榴二辉橄榄岩。它们在扬子板块向华北板块的俯冲过程中与俯冲板片一起经历了超高压变质作用。这两种原岩来源不同的石榴橄榄岩中的橄榄石具有相似的结晶学优选方位(LPO):[100]轴主...
宋衍茹金淑燕叶凯
关键词:超高压变质橄榄石
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Quartz and clinoenstatite exsolutions in clinopyroxene of garnet-pyroxenolite from the North Dabie Mountains,eastern China被引量:4
2001年
The exsolution lamellae of quartz and clinoen-statite are idenfied in diopside of garnet-pyroxenolite from the North Dabie Mountain by transmission electron microscopy, which is interpreted that the lamellae are originally exsolved from a former ultra-high-pressure clinopyroxene due to decreasing of pressure. Study of petrography shows that there is compositional zoning hi the diopside itself. It is implied that the garnet-pyroxenolite had undergone intensive high-temperature granulite fades and high-amphibolitic fades retrogressive metamorphism, while the peridotite (the garnet-pyroxenolite’s host rock) emplaced the
SU WenYOU ZhendongWANG RuchengLIU Xianwe
关键词:EXSOLUTIONDABIE
大洋深俯冲带流变性质及其地球动力学意义——来自地幔岩高温高压实验的启示被引量:15
2001年
在压力3GPa,温度1450~1600K,应变速率10-4~10-5s-1条件下,对深俯冲带和上地幔中两种重要岩石(榴辉岩和方辉橄榄岩)的流变性质进行了实验研究,获得了榴辉岩在超高压条件下的流变参数,应力指数为3.4,活化能为480kJ/mol,活化体积为12cm3/mol.实验结果表明具有中等石榴石含量榴辉岩的流变强度与方辉橄榄岩的流变强度在上地幔浅部条件下基本相当,是多晶绿辉石岩强度的2~3倍和多晶石榴石岩强度的一半.随榴辉岩中石榴石含量的逐步增加,岩石的整体流变强度也不断增大.在实验研究基础上,计算了不同板块汇聚速率条件下深俯冲大洋岩石圈在不同深度层次上的流变强度,以及橄榄岩和榴辉岩上地幔流变强度随深度的变化.研究表明,俯冲洋壳从下覆的上地幔拆离出来最有可能发生在缓慢俯冲的热俯冲带中;而快速俯冲的冷俯冲带,俯冲地壳与上地幔之间在强度上是耦合的,发生拆离的可能性不大.过渡带是上地幔中除岩石圈地幔外的高强度和高黏度层.
金振民章军锋金淑燕金淑燕H.W.Green
关键词:地幔岩高温高压实验榴辉岩方辉橄榄岩地球动力学
Coesite inclusions in zircon from gneisses identified by laser Raman microspectrometer in ultra-high pressure zone of Dabie Mountains,China
The mineral inclusions in zircon from gneisses in ultra-high pressure(UHP) zone of the Dabie Mountains were id...
LIU Jingbo~1,YE Kai~1 CONG Bolin~1, Maruyama Shegnori~2 & FAN Hongrui~1 1.Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China
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斜长石组构与下地壳各向异性被引量:7
2000年
着重阐述了下地壳各向异性特征与成因、研究内容和方法、各向异性动力学意义 ,并强调指出斜长石在下地壳物理环境下的塑性变形过程中形成的组构或晶格优选方法 ( LPO)是下地壳地震波各向异性之主因。
金淑燕
关键词:下地壳斜长石组构各向异性动力学意义
Rheological properties of deep subducted oceanic lithosphere and their geodynamic implications被引量:3
2002年
According to the experimental studies on the rheology of two important mantle rocks (eclogite and harzburgite), the rheological properties of the deep subducted oceanic lithosphere are investigated by assuming a simplified harzburgite type slab model with moderate thickness of basaltic layer. When the mantle convergence rate is small or the subducting slab has been trapped in the mantle for an enough long time, the strength profile of the slab is characterized by a strong subducting crustal component lying on a weak subducting upper mantle. However, if the convergence rate is large enough, the subducting slab will be featured only by a rigid cold center. Our study suggests that the detachment of the subducting crust component from the underlying upper mantle is only likely to happen in hot slow subducting slabs, but not the cold fast subducting lithosphere. Rheological properties of the harzburgitic and the eclogitic upper mantle vary with depths. The eclogitic upper mantle is stronger than the peridotitic upper mantle across the upper mantle. Transition zone is the high strength and high viscosity layer in the upper mantle except the lithosphere.
金振民金淑燕章军锋H.W.Greenll
关键词:SUBDUCTIONMANTLERHEOLOGICAL
大别山双河超高压硬玉石英岩显微组构特征及其流变学意义被引量:3
2004年
硬玉石英岩是大别—苏鲁超高压 (UHP)变质带内重要超高压岩石类型之一 ,其变形机制和动力学背景参数 (应变、应力、应变速率 )对于全面了解超高压造山带的形成和演化有非常重要的意义 .对大别山双河地区超高压硬玉石英岩 3个样品中的主要组成矿物硬玉和石英进行显微组构和透射电镜 (TEM)的初步研究 .晶格优选方位 (LPO)测量成果表明 :硬玉组构类型与绿辉石相近 ,为L ,LS型 ;石英组构类型主要为单斜对称 .TEM研究表明硬玉滑移系以 (1 0 0 ) [0 0 1 ]、(1 1 0 ) [0 0 1 ]及 (1 - 1 0 ) 1 / 2 [1 1 0 ]为主 .石英中位错发育 ,滑移系以 (0 0 0 1 ) [1 1 2 - 0 ]底面滑移为主 。
王璐金振民刘祥文金淑燕
关键词:硬玉绿辉石组构流变学TEM
大别山-苏鲁超高压变质带的矿物学和岩石学研究进展被引量:20
2001年
本文总结了近年来大别山 苏鲁超高压变质带的矿物学和岩石学进展。针对大别山 苏鲁超高压变质带中的区域片麻岩围岩是否经历超高压变质的问题 ,研究者在常规岩石学和矿物学手段不能奏效的情况下 ,引入显微喇曼光谱测试 ,最终在各种类片麻岩的锆石中发现柯石英、硬玉和雯石等高压和超高压矿物包裹体 ,证明大别山 苏鲁超高压变质带中的大多数岩石曾与榴辉岩一起被俯冲到地幔深度 ,后又一起回返到地表。在喇曼光谱的测试过程中 ,发现锆石中的柯石英包裹体有 0~ 2 3 0 0MPa不等的现时晶内超压 ,并证明这种晶内超压是超高压变质岩回返过程中 ,柯石英向石英转化而导致的体积膨胀造成的。研究者在产于青岛仰口榴辉岩的石榴子石中发现大量单斜辉石、金红石和磷灰石出熔 ,精细的晶体化学和岩石学研究证明出熔前的石榴子石形成于大于 70 0 0MPa的压力条件 ,说明苏鲁地区的部分陆壳岩石可能曾被俯冲到大于 2 0 0km深的地幔。岩石学研究发现产于桃行地区的榴辉岩在角闪岩相区域退变质之前 ,在 4 0~ 5 0km的浅部地幔深度发育有一期高压麻粒岩相 过渡榴辉岩相变质。进一步研究发现这期变质是由于峰期的多硅白云母在回返到 4 0~5
叶凯
关键词:超高压变质带矿物学岩石学
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