成矿能在吉林四平钨矿土壤测量工作中的应用效果分析

利用传统的土壤测量方法,发现了四平市脉状蚀变破碎带型白钨矿矿床。土壤异常具有强度高、套合好的特点。试用Н.И.萨弗罗诺夫提出的成矿能理论,进行成矿元素地球化学分析及化探综合异常提取研究来表达土壤测量异常,结果表明,该方法具有概括性好,地质效果更加明显的优点。     

福建安溪铅山铅锌矿床地质特征及成因探讨

铅山铅锌矿位于清流—安溪北西向断裂带与平潭—漳平东西向断裂带的复合部,闽中多金属矿化集中区南端的洛阳—剑斗东西向多金属成矿带中段,矿体贮存于北东向断裂破碎带中,为岩浆期后中低温热液矿床,控矿的北东向断裂带是多期次构造活动的产物,主成矿期为燕山早期,铅山周围尚有较大的找矿远景。     

粤西云浮镇安-阳春罗阳地区地球化学特征与找矿方向

分析云浮镇安-阳春罗阳地区元素的分布、分配特征和区域地质背景后,指出该地区有找矿潜力,提出Au、Ag、Cu、Pb、Zn是重要的找矿元素,找构造蚀变岩型金矿、火山岩型金矿、岩浆热液型银-多金属矿前景好,主要的找矿标志是断裂和蚀变.     

云南白牛厂银多金属矿水文地质特征及其水害的预测与防治

云南白牛厂银多金属矿区位于红河与南盘江两大水系分水岭东侧的德厚河水文地质单元的补给区,属红河流域。为确保矿山的安全高效开采,须对矿床的充水通道、充水因素等进行分析。通过对云南白牛厂银多金属矿进行水文地质条件调查,详细分析矿区的水文地质特征,认为矿区充水通道主要为矿区的构造破碎带;矿床充水因素主要为大气降水、地下水、地表水:地下水是矿床充水的主要水源,大气降水与地表水是矿床充水的影响因素;该矿床为顶板和地板直接充水的水文地质条件中等-复杂的岩溶裂隙含水层充水矿床。预测了矿山开采可能会遇到的危险(如雨季发生突水等),提出了防治措施及建议。     

Extreme rainfall characteristics for surface slope stability in the Malaysian Peninsular

This paper discusses the results of an investigation on the influence of rainfall intensity and duration on the suction distribution within a soil mass. A series of numerical analyses were conducted on an infinite slope model to simulate the responses of the slope consisting of typical soil types to various rainfall intensities and durations from selected locations in the Malaysian Peninsular. The study showed that the critical duration was governed by three major factors: the saturated permeability of the soil, the geographical location, and the depth of the slip plane. The critical rainfall duration for highly permeable soil was 1 day, while 30 days of antecedent rainfall were required for the stability analysis of a slope made of soil with low saturated permeability. The critical duration of antecedent rainfall in soils with intermediate saturated permeability was found to vary with the rainfall pattern. A chart is proposed to determine the critical duration, critical intensity and critical suction for each type of soil.     

Distribution Characteristics of Effective Source Rocks and Their Control on Hydrocarbon Accumulation: A Case Study from the Dongying Sag, Eastern China

The exploration conducted in the Bohai Bay basin, eastern China has demonstrated that the abundant petroleum resources have close affinities to the hydrocarbon kitchen with rich organic matter. A number of oil-generating associations with various characteristics of organic geochemistry and assemblages of multiple reservoir facies are developed due to the multi-center sedimentation, multi-source supply and multi-cycle evolution of filling, which have resulted in the formation of multiple oil and gas accumulation zones of various layers and trap styles. Among them the Paleogene Shahejie Formation is the most important hydrocarbon accumulation combination in the Dongying sag. Heretofore, its proved reserve has reached nearly 1.8×109t, which accounts for more than 90% of the total proved reserves of the Dongying sag. Based on previous studies, more than 600 source rock samples and 186 crude oil samples of the Shahejie Formation, collected from 30 oilfields, have been treated with organic geochemical testing     

凤太矿集区金铅锌矿地球化学特征及找矿方向

通过对金、铅锌矿成矿规律和地球化学特征的研究,讨论陕西凤太矿集区今后的找矿方向,并初步圈定了4处找矿靶区.     

西藏冈底斯西段狮多地区火山岩的地质地球化学特征

西藏冈底斯西段狮多地区火山岩为一套高钾钙碱性和钙碱性系列岩石,分为古新世(59 7Ma)和中新世(17 2Ma)两个活动时期,早期的时代和层位大致相当于冈底斯东段的林子宗群典中组。与典中组火山岩相比较,该期火山岩的稀土元素总量(w(∑REE)=58 83×10-6)低得多,轻、重稀土分馏程度(w(La)N/w(Yb)N=3 44)较弱,分布曲线更为平缓;N(143Nd)/N(144Nd)的现在值(0 512275～0 512420)和初始值εNd(t)(-6 7～-4 0)也明显偏低,这反映冈底斯东、西段同一时期的火山活动及演化各具特色。根据Pb、Nd、Sr同位素的组成特征和微量元素构造环境判别推断,狮多地区火山岩形成于陆缘弧—陆 陆碰撞造山的发展演化环境,是新特提斯洋壳向大陆下俯冲作用过渡到陆 陆碰撞造山作用的产物。狮多铁 铜矿与古新世火山岩有成因联系。     

大坪金矿床石英的标型特征及其地质意义

文章论述石英的物理性质、化学成分、包裹体特征及同位素组成,从而提供了有关大坪金矿床的成矿作用、矿床成因及找矿远景等方面的矿物学标志.     

西湖凹陷平北地区泥岩地球化学特征及其地质意义

为了研究西湖凹陷平北地区泥岩微量及稀土元素的分布特征及其地质意义,采用ICP—MS对研究区25个泥岩样品进行了稀土元素和微量元素分析,研究表明：（1）研究区泥岩稀土元素主要来自陆源碎屑矿物,源岩主要为沉积岩及碱性玄武岩;（2）始新世末构造运动揭示的构造沉积界线在研究区留下了证据,微量元素比值、稀土总量等参数在此界面上存在明显的突变,界线十分明显,并且此界线亦是研究区平湖组与花港组的沉积界面,界面以下以三角洲沉积为主,界面之上主要为河流相沉积,这一沉积相转换面在研究区P1井尤为明显;（3）利用Sr／Cu比值推测平北地区始新世中晚期．早渐新世经历了较为明显的气候变化,总体上有逐渐变温湿趋势,并且研究区北部要温湿于南部。