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安徽庐江小包庄铁矿是近年来发现的深部大型铁矿床,其主矿体位于已探明的大型铁矿罗河铁矿的正下方800～1 000 m处,是在“以矿找矿”思想指导下寻找深部矿产资源的一次重大突破。在罗河铁矿区域的原有地磁异常认识的基础上,运用小波多尺度分解技术处理高精度磁测数据,结果表明该区域的深部第二空间找矿潜力巨大。应用三分量磁测井技术对已有钻孔进行三分量的精细测量和磁异常的特征分析,在钻孔ZK2602深部发现弱磁异常。通过加深钻孔来勘查异常来源,在孔深1 377 m处见厚大的磁铁矿体。根据地面高精度磁测异常和已有钻孔测井分析矿体的延伸、走向、倾向布置钻探工程,见矿效果良好,确定小包庄铁矿的储量属大型矿床,是庐枞地区深部找矿的一次重大突破。 相似文献
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罗河铁矿床是20世纪80年代在长江中下游成矿带庐枞盆地中发现的规模最大的铁矿床。经深部找矿勘探工作,2013年在罗河铁矿床主矿体800~1000 m之下又发现了小包庄铁矿床,这是近年来在长江中下游成矿带深部找矿工作中的重大进展之一,对该矿床地质特征的总结和形成时代的精确厘定,是正确分析矿床成因机制,完善玢岩型铁矿床成矿理论的关键。文章在已有研究的基础上,通过详细的钻孔岩芯观察、系统的岩相学和矿相学及电子探针分析测试工作,查明了罗河铁矿和小包庄铁矿的矿化蚀变特征,厘定了矿化阶段,初步探讨了成矿作用过程;对小包庄铁矿床进行了高精度金云母~(40)Ar-~(39)Ar同位素年代学研究,获得坪年龄为(130.32±0.78)Ma,相应的等时线年龄为(130.5±1.5)Ma,反等时线年龄为(130.4±1.3)Ma。结合庐枞盆地及区域成岩成矿时代,认为盆地内玢岩型铁矿床集中形成于130 Ma左右,是长江中下游成矿带第二阶段(135~126 Ma)成矿作用的产物。 相似文献
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长江中下游成矿带庐枞盆地小包庄铁矿床地质特征研究 总被引：3，自引：0，他引：3
罗河铁矿床位于长江中下游成矿带内庐枞火山岩盆地的西北部,是成矿带内已发现规模最大的铁矿床。2013年在罗河铁矿床深部又勘探新发现了小包庄大型铁矿床,这是长江中下游成矿带内近年来重大找矿突破之一,具有重要的理论研究意义和勘探应用价值。本文在前人工作基础上,基于详细的钻孔观察和系统的岩相学、矿相学工作并结合电子探针测试分析,研究了小包庄铁矿床的矿化蚀变特征,厘定了矿床的成矿阶段,分析了成矿作用过程,并初步探讨了矿床成因。研究表明,罗河铁矿床和小包庄铁矿床为同一成矿系统在不同深度成矿作用的产物。小包庄铁矿床主矿体矿呈厚大的透镜状、似层状产于砖桥组地层中,位于罗河铁矿床主矿体之下约800~1000m,主要由浸染状矿体组成。矿床中金属矿物主要为磁铁矿和黄铁矿,非金属矿物主要为硬石膏、透辉石和碳酸盐,矿石的代表性矿物组合为磁铁矿-硬石膏-透辉石。矿石的结构构造主要有浸染状构造、脉状构造、块状构造、自形-半自形粒状结构、他形粒状结构和筛状结构等。矿床围岩蚀变强烈,主要蚀变类型有碱性长石化、透辉石化、绿泥石化、绿帘石化、碳酸盐化和硬石膏化。小包庄铁矿床形成经历了热液期的四个阶段,即碱性长石阶段、透辉石-硬石膏-磁铁矿阶段、绿泥石-绿帘石-碳酸盐阶段和硬石膏-黄铁矿-碳酸盐-石英阶段,其中,铁矿化主要发育于透辉石-硬石膏-磁铁矿阶段。通过矿床地质特征的分析以及与宁芜地区铁矿床的对比研究,本文认为小包庄铁矿床成矿物质和成矿流体来源于深部的闪长质侵入岩(?),而矿化发育在远离侵入岩或次火山岩之上的火山岩中,明显有别于宁芜地区玢岩铁矿床,类似于智利安第斯成矿带中部分产于安山质火山岩中的磁铁矿-磷灰石型矿床,是长江中下游成矿带中产于火山岩中的一类特殊类型的玢岩型铁矿。 相似文献
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安徽庐枞盆地小包庄铁矿的矿床地质特征和成矿机制以及与罗河铁矿的关系 总被引：1，自引：0，他引：1
小包庄铁矿位于长江中下游成矿带庐枞火山岩盆地中,是近年发现的又一大型玢岩型铁矿床。本文基于详细的岩相学、矿相学观察,对小包庄铁矿的围岩及典型矿物的主微量元素、硫同位素、流体包裹体进行了分析测试,结果显示,小包庄铁矿磁铁矿矿石中不同成矿阶段形成的黄铁矿、硬石膏的δ34S值异常高,黄铁矿集中在6‰~15‰之间,硬石膏集中在16‰~24‰之间,并且随着成矿期次由早到晚、深度由深到浅,黄铁矿、硬石膏的δ34S值逐渐降低,同时测得小包庄铁矿下部三叠系东马鞍山组膏盐层的δ34S值为30.1‰,反映了小包庄铁矿有膏盐层硫的加入。包裹体测温结果表明,小包庄铁矿透辉石-磁铁矿-硬石膏化蚀变阶段、绿帘石化蚀变阶段、碳酸盐-硬石膏-黄铁矿化蚀变阶段和硬石膏-石英-黄铁矿化蚀变阶段的成矿流体温度分布区间分别为326~496℃、259~317℃、178~280℃和107~189℃,盐度分布区间为14%~21%NaCleqv、11%~20%NaCleqv、6%~16%NaCleqv、2%~13%NaCleqv,成矿流体经历了从高温高盐度向低温低盐度演化的过程。从成矿岩体、矿体矿石特征、蚀变分带以及成矿温度等方面与罗河铁矿进行对比表明,小包庄铁矿与罗河铁矿为同一类型的两个独立矿床,其在空间上上下叠覆的模式可能是由闪长质岩浆在不同深度侵位造成的。 相似文献
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安徽庐枞地区铁矿成矿条件和综合信息标志 总被引：3，自引：0，他引：3
在全面收集安徽庐枞地区铁矿2种主要矿床类型(罗河式、龙桥式)资料的基础上,综合整理了该区玢岩型铁矿成矿地质条件,在地质、物探、化探、遥感、自然重砂等找矿信息研究的基础上,对该区铁矿综合信息标志进行了研究。研究结果表明,罗河式、龙桥式铁矿分别产于燕山晚期砖桥组的火山岩和火山岩盆地基底地层中三叠世周冲村组中,铁矿床与该区富碱、富钾中基性火山岩、次火山岩及基底隆起、基底断裂、环形构造等密切相关,成矿物质主要来源于中基性岩浆、周冲村组膏溶角砾岩等,磁异常与重力异常同位是该区地质找矿的重要标志。 相似文献
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在柳河马家店铁矿中应用高精度磁法勘探,证明了磁法在寻找磁铁矿上具有显著的效果。文章通过论述磁异常特征,结合本区的地质情况,对所取得的磁异常进行定性研究,同时结合基础地质工作,在磁异常上实施工程验证,成功发现铁矿床,总结该区铁矿成矿规律,为今后物探、地质相结合的综合找矿起到了一定的指导作用。 相似文献
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近年来,山东禹城取得了富铁矿找矿重大突破,具有良好的找矿潜力,但区内尚有多处局部异常尚未查证。该区新生界厚度大(900～1100 m)、磁铁矿体埋藏深,矿体引起的地球物理异常弱,找矿难度大。为系统总结该区磁铁矿异常特征,为钻孔部署提供依据,重点剖析了禹城李屯地区航空重磁平面异常特征、地面高精度磁测异常特征,总结了矽卡岩型铁矿主要重磁异常找矿标志,主要为化极磁异常、剩余磁异常、垂向导数和总梯度模的异常中心,圈定了叠道村和于庄村2处找矿靶区。通过地震约束下的2.5D重磁剖面反演,推断了矿体赋存位置,指导部署了验证钻孔孔位,经钻探验证在禹城市李屯地区叠道村异常取得重大找矿新突破。研究成果对于该区下一步找矿勘查和其他深覆盖区矽卡岩型富铁矿找矿具有指导作用和借鉴意义。 相似文献
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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
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The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
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
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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
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Guboglo M. N. 《GeoJournal》1980,4(1):53-58
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
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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
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Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
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
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Dean S. Oliver 《Mathematical Geology》1998,30(7):911-933
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
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Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
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
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正Artemia cysts are an extremely important component of aquaculture diets.It is well established that the cultivation of fish and shellfish derive substantial health and growth advantages when Artemia are included in the diets of the 相似文献