江西九江武山铜矿构造-蚀变矿化特征及深部成矿预测   总被引：5，自引：0，他引：5       下载免费PDF全文

李颖  吕古贤  申玉科  吴亚民 《地质找矿论丛》2010,25(1):18-23

武山铜矿地处长江断裂南侧的九江—瑞昌构造带中心部位,发育于横立山—黄桥向斜的北翼。不整合面及武山岩体接触带是矿体赋存的主要部位;上泥盆统五通组含砾石英砂岩和中石炭统黄龙组白云质灰岩之间的层间断裂带、中石炭统黄龙组和下二叠统栖霞组灰岩的层间断裂带控制块状多金属硫化物体的成生与富集,而武山岩体与石炭系、二叠系灰岩、灰岩捕虏体的接触带则形成夕卡岩型矿体;在武山岩体和石英砂岩接触部位则难以形成工业矿体。在研究断裂构造、接触带构造、褶皱构造和围岩组成特征基础上,预测在标高-1 100 m之上,武山岩体与灰岩的接触带中仍有较好的找矿前景,而在武山岩体与泥盆系、志留系巨厚碎屑砂岩的接触部位则矿化较差。  相似文献   

A new fold test for palaeomagnetic studies   总被引：10，自引：0，他引：10  

P. L. McFadden 《Geophysical Journal International》1990,103(1):163-169

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辽吉古元古宙褶皱带构造分区与构造演化     

刘俊来  关会梅  崔迎春 《华北地质》2002,(Z1)

辽吉古元古宙褶皱带是早前寒武纪时期的一条重要的褶皱造山带与成矿带。依据褶皱带在组成、结构、构造特点、成矿作用与变质作用和岩浆作用演化上的变化 ,识别出褶皱带的内部分带性。褶皱带由北部线性褶皱带和南部隆褶带构成 ,二者虽然具有诸多方面的差异 ,但却具有统一的区域构造演化并产生了统一的构造系统。文中系统讨论了褶皱带的结构、组成、构造特点与构造演化。重点讨论了褶皱带早期演化中形成的隆滑构造与岩浆核杂岩的特点 ,并对褶皱带研究与找矿工作中涉及到的一些关键问题进行了讨论。  相似文献   

The kinematic history of the Singhbhum Shear Zone     

Sudipta Sengupta  S. K. Ghosh 《Journal of Earth System Science》1997,106(4):185-196

The progressive deformation of the Singhbhum Shear Zone (SSZ) involved the initiation of a mylonitic foliation, its deformation by three generations of reclined folds and superposition of two later groups of folds, i.e., a group of asymmetric folds with subhorizontal or gently plunging axes and a group of gentle and open, transverse and more or less upright folds. The occurrence of sheath folds and U-shaped deformed lineations indicate that the reclined folds were produced by rotation of fold hinges through large angles. The total displacement along the SSZ was compounded of displacements along numerous mesoscopic shear zones. The cleavages in the shear lenses and the mesoscopic shear zones cannot be distinguished as C and S surfaces. They have the same kinematic significance and were produced by ductile deformation, although there were localized discontinuous displacements along both sets,-of cleavages. A mylonitic foliation had formed before the development of the earliest recognizable folds. Its time of formation and folding could be synchronous, diachronous or partly overlapping in time in the different domains of the SSZ.  相似文献   

气象仪器测量误差比较的n重制约法   总被引：1，自引：0，他引：1  

潘闻天  戴铁丕 《南京气象学院学报》1997,20(2):248-250

把用于比较气象仪器误差的“三重制约法”推广为“ｎ重制约法”，并给出数学推导及一个实例。结果表明该方法是有效的，在没有标准仪器的情况下，可用此方法同时检验多台仪器测量精度的优劣。  相似文献   

滇桂交界区印支期前陆褶皱冲断带   总被引：14，自引：2，他引：14       下载免费PDF全文

吴根耀 《地质科学》2001,36(1):64-71

最近发现的蛇绿岩指示中、越交界区发育一条古特提斯的地缝合线,分开了越北地块和华南次大陆。滇桂交界处的印支期前陆褶皱冲断带为古特提斯造山带提供了进一步的证据。本文讨论了冲断-推覆构造的特征,提出该地的古特提斯洋具复杂的大陆边缘,沿北西走向段先发生碰撞,之后沿北东东向段发生碰撞,北西向断裂则发生右行的走滑(或右行斜冲)活动。冲断作用是向北或北东扩展的,仰冲的增生杂岩可能掩埋了大部分磨拉石沉积,造成了磨拉石不发育的假象。  相似文献   

天山的晚新生代构造变形及其地球动力学问题   总被引：73，自引：6，他引：73  

张培震  冯先岳 《中国地震》1996,12(2):127-140

天山是大陆内部典型的新生代复活造山带，其新生代构造变形的方式，变形量，速度及过程等对于认识大陆内部造山带的变形机理有着重要的意义。本文在对南北天山主要活动构造地质填图和综合研究的基础上，重点探讨了天山的晚新生代构造变形特征及其动力学问题。早更新世以来，特别是早，中更新世之间，天山的构造活动由内部向南北两侧扩展，使得两侧的新生代凹陷逐渐褶皱成山，形成数排新生代褶皱带，整个天山的现代构造活动是一种扇形  相似文献   

塔里木北缘库车盆地冲断构造平衡地质剖面研究   总被引：18，自引：0，他引：18  

杨庚  钱祥麟  李茂松  张明山  张志诚  郭召杰 《地球科学》1996,21(3):295-299

库车盆地位于天山与塔里木之间，在盆内发育有一系列冲断推覆构造，其主要构造样式为沿倾角２．５°基底拆离面上发育的背驮式冲断构造系，逆冲方向由北向南形成时代为中新世—第四纪．应用平衡地质剖面原理，建立了该冲断构造带的两条平衡地质剖面和复原剖面，结果表明，库车盆地冲断构造缩短率达到３５％～４５％，但缩短量不一致．三叠系—侏罗系缩短４０～５０ｋｍ，白垩系—上新统缩短２７～３７ｋｍ  相似文献   

A Three—Stage Metallogenic Model for Gold Deposits in Metamorphosed Microclastic Rocks   总被引：1，自引：0，他引：1  

王秀璋  程景平等 《中国地球化学学报》1996,15(3):258-264

Gld deposits occurring in metamorphosed microcelastic rocks are distributed extensively at home and abroad.Some deposits of this type are of superlarge tonnage.The formation of gold deposits in metamorphosed microclastic rocks involves three stages:the sedimentary stage,the regionally metamorphic stage,and the ore-forming stage.At the first stage,microclastic sedimentary source rocks were developed in a relatively semi-enclosed reducing sea basin and were enriched in carbon,sulfur and gold.At the second stage,the gold adsorbed on organic matter and clay minerals was relesed and poorly concentrated during the destruction of organic matter and the depletion of clay minerals by regional metamorphism with increase temperature and pressure.At the third stage,a tectono-hydrothermal event took place.As a result,gold was leached from metamorphosed microclastic rocks,transported to ore depositional locus and/or mixed with gold of other sources in the course of migration,and finally precipitared as ores.Gold deposits of this type were eventually formed at the third stage,and they also can be classified as the orogenic belt type and the activation zone type.The gold deposits occurring in metamorphosed microcalastic rocks are the products of reworking processes and the influence of magmatism should be taken into consideration in some cases.  相似文献   

塔里木盆地北缘库车前陆褶皱──冲断构造分析   总被引：19，自引：1，他引：19  

贾东  卢华复 《大地构造与成矿学》1997,21(1):1-8

库车前陆褶皱－冲断带是以断坪－断坡式的台阶状逆断层作为滑动机制的盖层薄皮推覆构造，它们在剖面上形成一个向南变薄尖灭的推覆构造楔，底部沿脱面在北侧深南侧浅，推覆变形也是自北向南传递。依据其构造形态和变形特点可分为五个构造亚带：（1）南天山前缘楔状构造带；（2）库姆格列木－依奇克里克断层扩展褶皱构造带：（3）吐格尔明－吉迪克断层弯曲褶皱构造带：（4）秋里塔格断层扩展褶皱与断层弯曲褶皱叠加构造带；（5）库车－亚肯生长断层弯曲褶皱构造带。  相似文献