首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 93 毫秒
1.
怀安—大同一带基性麻粒岩变质反应序列与水活度   总被引:1,自引:5,他引:1  
刘福来 《岩石学报》1997,13(1):27-43
晋冀蒙三省交界的怀安-大同一带基性麻粒岩有保存完好的变质反应结构。依据岩相学特征,可在基性麻粒岩中区分出四个世代的矿物组合:①峰前阶段(M1)以包裹在石榴石或紫苏辉石中的Hb+Pl±Qz、Cpx+Hb+Pl±Qz组合为代表,T为600℃~700℃,P为0.70~0.82GPa,相应的aH2O值为0.50~0.62;②峰期阶段(M2)以三联点结构的基质矿物为特征,组合为Opx+Cpx+Hb+Pl±Qz、Gt+Opx+Cpx+Hb+Pl±Qz,T为750℃~850℃,P为0.84~1.05GPa,相应的水活度降至0.39~0.52;③峰后近等温减压阶段(M3)以石榴石普遍转变为Opx+Pl±Mt及角闪石转变为Opx+Cpx后成合晶为特征,T为700℃~780℃,P为0.50~0.70GPa,相应的aH2O值降至0.08~0.11;④至降温阶段(M4),以无水矿物石榴石、辉石退变为Hb+Pl组合为代表,T为530℃~630℃,P为0.30~0.42GPa,aH2O值再次升至0.37~0.40。研究表明,矿物组合演化和所发生的(脱水)变质反应不仅受PT条件的控制,而且与体系水活度密切相关  相似文献   

2.
通过对大别山北部石榴二辉麻粒岩中的变质结构及变质反应特征的研究,认为石榴二辉麻粒岩在变质作用过程中,经历了四个主要的变质演化作用阶段:(1)S1阶段以早期的残留矿物,并呈包体的形式产于石榴石中为特征,以Cpx+Q(Cs)+Ru+Gt组合为代表,T=612~750℃,表明石榴二辉麻粒岩曾经历过榴辉岩相阶段的变质作用;(2)S2阶段是以Opx+Cpx+Gt+Amp+Q+Ti+Mt矿物组合为牲,其相应的T=837~887℃,P=1.03~0.95Gpa,此时的变质条件为麻粒岩相;(3)S3阶段,矿物组合为Cpx+Gt+Amp+Pl+Mt,T=530~660℃,P=0.85~0.95Gpa,此时的温故知新压条件代表岩石已经进入了角闪岩相阶段;和(4)晚期的低角闪岩相阶段S4,其形成的温压条件为T=495℃,P=0.56~0.70Gpa。  相似文献   

3.
蔓箐沟地区石榴基性麻粒岩发育多期变质反应结构。矿物组合演化可划分三个阶段:①峰期阶段(M1),以包裹于石榴石中的Opx+Cpx±Hb+Pl±Qz和由Gt+Opx+Cpx±Hb+Pl±Qz组成基质矿物组合为代表;②退变早期近等温减压阶段(M2),形成蠕虫状后成合晶Opx+Hb+Pl±Mt;③退变晚期阶段(M3),则形成细粒、黄绿色Hb+中酸性Pl的较低温组合。并揭示该区石榴基性麻粒岩从中下部地壳的麻粒岩相变质,到快速抬升至中浅部地壳发生的近等温减压及晚期降温退变的复杂pT演化历史。  相似文献   

4.
胶东莱西地区高压基性麻粒岩的变质作用   总被引:28,自引:19,他引:9  
刘文军  翟明国 《岩石学报》1998,14(4):449-459
胶东地区莱西-莱阳-栖霞-带晚太古代花岗片麻碉中,出露相当规模的高压基性麻业岩和超镁铁质岩组合,曾被认为它们是与苏鲁-大别超高压碰撞造山作用有关的一套岩石组合,高在性麻粒岩中可同三期变质矿物组合;早期为Grt核部)+Cpx+Pl;中期为Grt(边中)+Cpx+Opx+Pl+Amp+Q+Mt;晚期为Cpx+Pl+Amp+Q+Mt。早期的石榴石含钱铝榴石和镁铝榴石组分较高,单斜辉石含Al高。应用矿物温  相似文献   

5.
辽西建平变质杂岩区蠕虫状后成合晶的成因与意义   总被引:2,自引:2,他引:2  
季建清  陈曼云 《岩石学报》1996,12(4):514-529
建平变质杂岩中发育蠕虫结构的后成合晶,它受与石榴石共生的矿物组合、变质流体中水活度和变质岩原岩的制约。这种后成合晶可出现四种矿物组合:(1)Opx+Pl+少量Cpx,(2)Opx+Mt+Pl+Q+少量Cpx,(3)Hb+Pl,(4)Cord+Opx±Pl。它们是在建平变质杂岩受中元古代三座庙序列侵入岩侵位作用影响发生的相当于辉石角岩相接触热变质作用中形成的,温压条件为720℃~780℃,0.64~0.70GPa。这些后成合晶的结构特征、矿物学特征、变质反应前后体积变化、岩体热传导模型的时间域的半定量估算等都表明它们是在压力降低,热扰动历史较为短暂(介于2.85Ma和11.40Ma之间)的非平衡条件下形成的  相似文献   

6.
勉县地区勉略带内麻粒岩的发现及构造意义   总被引:16,自引:7,他引:9  
李三忠  张国伟 《岩石学报》2000,16(2):220-226
勉县菜马河南部徐家坪附近勉略带中多处发现基性麻粒岩岩块,基矿物共生组合为:Cpx+Gt+Pl(An30)+Qz+Rut。采用Ellis等温度计获得T为657 ̄772℃,采用Newton等压力计获得峰值P达0.82 ̄1.17GPa考虑到该压力计获得值往往偏低,校正后压力最高达0.97 ̄1.32GPa。基性麻粒岩中存在Gt+Cpx=Hb+Pl的退变反应,表明经历了等温降压过程,PTt轨迹为顺时针,反映  相似文献   

7.
吉林桦甸地区太古宙麻粒岩变质作用的PTt轨迹   总被引:1,自引:0,他引:1  
本区太古代的表壳岩系(基性麻粒岩及富铝片麻岩等)经历了麻粒岩相变质作用,根据矿物共生组合及其转化关系可将形成麻粒岩的变质作用划分为早期角闪岩相阶段(T=575-600℃,P=0.59GPa)、峰期麻粒岩相阶段(T=835℃,P=0.85GPa)和晚期角闪岩相阶段(T=620℃,P=0.70GPa),其PT_t轨迹为逆时针方向。峰期升温升压过程及晚期近等压冷却过程与IBC型PT_t轨迹相似,反映其形成于岛弧或大陆边缘构造环境。  相似文献   

8.
东南极拉斯曼丘陵出露的麻粒岩相泥质片麻岩和镁铁质麻粒岩经历了复杂的变形变质历史。代表前进的增厚事件的早期残留变质构造D1形成于1000Ma(Grenvilian)期间。对应于D1的变质峰期M1的变质组合以泥质片麻岩的石榴石和尖晶石变斑晶中的堇青石和夕线石包裹体以及镁铁质麻粒岩的石榴石变斑晶中的斜方辉石和斜长石包裹体为特征。在该区斯托尼斯半岛的紫苏黑云石英岩的粗粒紫苏辉石中发现了包裹的假蓝宝石+磁铁矿和假蓝宝石+尖晶石+夕线石+磁铁矿+石英组合,这种假蓝宝石又包裹更细粒的尖晶石包裹体。石榴石-斜方辉石温度计及石榴石-斜方辉石-斜长石-石英压力计的计算表明M1变质作用最大的P-T条件为0.95GPa和870℃。这些早期残留的矿物组合指示了其变质作用具有逆时针近等压冷却(IBC)的P-T演化特征,反映了它们的形成是一个埋深期间前进加热的进变质作用过程。本文得出该区M1(1000Ma)变质作用的逆时针(IBC)P-T轨迹可能与已存在的大陆壳下面的岩浆底侵作用及地壳内大量岩浆物质的侵入和结晶作用有关。此类型逆时针P-T轨迹不同于该区在晚期500Ma(Pan-African)期间顺时针演化的P-T轨迹  相似文献   

9.
威海—乳山麻粒岩带是苏北—胶南构造混杂岩带北东段的北西边缘带。麻粒岩体呈无根的透镜状。典型的共生矿物组合为Cpx+Gr+Pl±Q、Cpx+Opx+Gr+Pl和Opx+Gr+Cpx。单斜辉石含Jd2.50%—8.79%,石榴石含Pyr14.47%—35.36%。该麻粒岩形成条件:P为7.91—10.70×108Pa,T为717—807℃,地热梯度约21—25℃/km,埋藏深度约29—39km,属中压麻粒岩相。其变质作用峰期的年龄约(1913±9)Ma。  相似文献   

10.
北京密云麻粒岩相区变质作用演化及PTt轨迹的研究   总被引:2,自引:2,他引:2  
北京密云麻粒岩相区在早前寒武纪时期主要经历了两期变质作用。每期变质作用又可划分为三个连续的变质阶段,峰期阶段的P-T条件均达到了麻粒岩相.第一期变质作用约结束于2500Ma,具有与造山带相似的顺时针PTt轨迹,峰期阶段T为800~900℃,P=0.98~1.02GPa,这种轨迹主要与早期平卧褶皱和推覆构造使地壳大幅度增厚有密切关系。第二期变质作用约发生在1800Ma,PTt轨迹为具近等压加热(IBH)特点的顺时针轨迹,峰期阶段T为760~810℃,P为0.96~1.04GPa,这种轨迹与大陆地壳的拉伸作用有密切关系。  相似文献   

11.
东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。  相似文献   

12.
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning.  相似文献   

13.
郯庐断裂南段研究进展与断裂性质讨论   总被引:13,自引:3,他引:13  
据1:5万区域地质调查和专题研究资料,就郯庐断裂带是否南延与消失的原因,其与大别—苏鲁造山带交截形成的假位错效应,以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上,讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。  相似文献   

14.
塘口水电站大坝基础座落在断层和裂隙较发育的龟裂纹灰岩上,岩体完整性差、透水性强,多年运行后,大坝灌浆廊道和排水廊道出现多处集中性漏水,为确保大坝安全和电站正常发电,根据渗漏性质和成因,采用对灌浆廊道补充帷幕灌浆,对排水廊道进行固结+帷幕+回填灌浆。通过灌浆处理后,效果良好,表明灌浆工程有效的将导致坝基渗漏的上下游的裂隙通道封闭,并顺利的经受了随后的汛期洪水考验,大坝安全得到保障。  相似文献   

15.
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen.  相似文献   

16.
In reservoir characterization, the covariance is often used to describe the spatial correlation and variation in rock properties or the uncertainty in rock properties. The inverse of the covariance, on the other hand, is seldom discussed in geostatistics. In this paper, I show that the inverse is required for simulation and estimation of Gaussian random fields, and that it can be identified with the differential operator in regularized inverse theory. Unfortunately, because the covariance matrix for parameters in reservoir models can be extremely large, calculation of the inverse can be a problem. In this paper, I discuss four methods of calculating the inverse of the covariance, two of which are analytical, and two of which are purely numerical. By taking advantage of the assumed stationarity of the covariance, none of the methods require inversion of the full covariance matrix.  相似文献   

17.
某高速公路下伏煤矿采空区稳定性分析   总被引:10,自引:0,他引:10  
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。   相似文献   

18.
The Global Stratotype Section and Point (GSSP) for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy (SSS) proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy (ICS). The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob's Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs.  相似文献   

19.
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″.  相似文献   

20.
Important tendencies in development of the world mineral-resources sector at the beginning of the 21st century were an increase in production and consumption of mineral materials differentiated by types of metals and nonmetallic mineral raw materials, by countries and regions, as well as the concentration of the production of mineral raw materials in a small number of countries, and a reduction in industrial reserves of minerals in the world economy, even at the current stage of their extraction. These tendencies should be taken into account in working out a strategy for development of the Russian mineral raw-material base.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号