海南儋州南江褐铁矿矿床地质特征及控矿因素分析          下载免费PDF全文

张志  胡祥昭  郭旻 《地质找矿论丛》2011,26(1):34-38,45

南江褐铁矿产于下石炭统南好组中,矿体呈脉状、透镜状产出,规模较大、品位很高、质量较好.矿区内发育3组断裂,NNE向断裂控制了矿体的产出,并为矿液运移提供通道;兰洋岩体提供了成矿热液和物质来源.从矿床地质特征分析,为先成的热液型铁矿受古地理条件和气候影响,风化淋滤成褐铁矿,在地表出露为铁帽.预测其找矿前景较好.  相似文献   

廊坊地区土壤重金属污染程度评价   总被引：2，自引：0，他引：2  

蔡奎  栾文楼  李超  陈智贤  谷海峰  宋泽峰 《物探与化探》2011,35(5):675-679

利用河北省多目标地球化学调查资料,研究了廊坊地区表层土壤中重金属元素As、Cd、Cr、Hg、Pb的富集特征与污染程度.与我国土壤元素背景值相比,廊坊地区表层土壤中Hg的富集系数较大;与研究区元素背景值相比,Cd、Hg富集系数较大,富集程度依次为Hg＞ Cd＞ Pb＞ Cr＞ As.地积累指数污染评价结果表明,以全国土壤...  相似文献   

泌阳凹陷毕店地区油藏特征浅析     

朱颜  张伊琳  黄生娣  郑融  李恒权  柯思 《四川地质学报》2011,(4):417-419

泌阳凹陷毕店地区经过三十多年的勘探,一直没有取得实质性的突破。2005年以来对该区三维地震资料重新处理与解释攻关,基本具备了精细勘探的物质基础。毕店地区主体已发现的油气藏类型以断层+岩性油气藏为主。通过应用系统的研究思路,以现代石油地质理论为指导,初步探讨毕店地区油藏分布特征与油气成藏的控制作用。  相似文献   

Postrift Rapid Subsidence Characters in Qiongdongnan Basin,South China Sea     

尹新义  任建业  雷超  王珊  张俊霞 《中国地质大学学报(英文版)》2011,(2)

In this article,the backstripping technique was used in studying the subsidence charac-ters of the Qiongdongnan(琼东南) basin(QDNB) in order to understand its dynamic mechanism of formation and evolution.Meanwhile,the geothermal characteristics of this area were summarized,and the stretching factors(β) of the upper crust,the whole crust,and the whole lithosphere were calculated.The QDNB is characterized by high subsidence rate,high geothermal gradient,high geothermal heat flow,and the lithosphere stretching an...  相似文献   

引入退火机制的智能单粒子算法在复杂边坡最危险滑动面搜索中的应用     

张明瑞  陈征宙  刘裕华  曹东方  吴强 《工程地质学报》2011,19(2):181-186

复杂边坡的安全系数可能存在多个局部极小值点,如何确定边坡的最小安全系数是复杂边坡稳定性分析中的一个关键问题.本文结合简化Bishop法,采用一种新的启发式全局优化算法--智能单粒子算法(ISP0)来搜索复杂边坡的最危险滑动面.为帮助该算法快速跳出局部极值点,本文将模拟退火(SA)机制引入到智能单粒子算法中,结合了两种算...  相似文献   

模糊因子分析在地下水污染评估中的应用——以河南省洛阳市为例   总被引：3，自引：0，他引：3  

马荣  石建省 《地球学报》2011,32(5):611-622

传统的多元统计法难以定量化表征不同污染源对单个样本点的影响,本文引入了一种新的方法——模糊因子分析法.将该方法应用于洛阳市地下水污染来源解析研究,通过模糊聚类和因子分析对研究区样品进行分类,探明主要的污染源类型及其对整个研究区和单个样品点的污染贡献率.计算结果表明:洛阳市浅层地下水主要有以下四个污染源:基岩风化、加工制...  相似文献   

Dynamic factor analysis considering elastic boom effects in heavy lifting operations     

Kwang-Phil Park  Ju-Hwan Cha  Kyu-Yeul Lee 《Ocean Engineering》2011,38(10):1100-1113

The dynamic factor is the ratio of the maximum dynamic load to the static load acting on the wire ropes between the boom of a floating crane and a cargo. In this paper, the dynamic factor is analyzed based on dynamic simulations of a floating crane and a cargo, considering an elastic boom. For the simulation, we designed a multibody system that consists of a floating crane barge, an elastic boom, and a cargo connected to the boom through wire ropes. The dynamic equations of motion of the system are based on flexible multibody system dynamics. Six-degree-of-freedom motions are considered for the floating crane and for the cargo, and three-dimensional deformations for the elastic boom. The hydrostatic force, the hydrodynamic force, the gravitational force, and the wire rope forces are considered as external forces. The dynamic factor is obtained by numerically solving the equation. The effects of the elastic boom on heavy cargo lifting are discussed by comparing the simulation results of an elastic boom and a rigid boom.  相似文献   

Effect of macronutrient enrichment on the size distribution, sorption, and bioconcentration factor of iron by coastal phytoplanktonic diatoms     

Li SX  Zheng FY 《Marine environmental research》2011,72(3):89-95

The influences of macronutrient enrichment on iron absorption, adsorption, and the bioconcentration factor (BCF) of iron by coastal diatoms were examined. In addition, the distribution of different iron size fractions in seawater in relation to two diatom species exposed to nutrient enrichment over an extended period (6 days for Thalassiosira weissflogii, and 4 days for Skeletonema costatum), was investigated. Iron concentrations were measured of seven size fractions: particles (>0.4 μm), colloidal particles (0.4 μm–100, 100–50, 50–30, 30–10, 10–3 kDa), and soluble species (<3 kDa).The absorption, adsorption, uptake, BCF of iron by the diatoms, and the iron species distribution in seawater were affected by the diatom species, as well as the nitrate (N) and phosphate (P) concentration. The addition of P could affect the iron internalization strategy. The content of soluble iron species was positively correlated with the amount of iron absorption by T. weissflogii, but it was not suitable for S. costatum.  相似文献   

川东北宣汉-达县地区长兴组-飞仙关组礁滩储层特征及其控制因素          下载免费PDF全文

程锦翔  郭彤楼  谭钦银  王瑞华  张清洪 《沉积与特提斯地质》2011,(3):64-70

川东北宣汉-达县地区是我国重要的气藏发育区块。为了深入探索储层特征、物性与岩石类型,成岩作用的相关性,运用薄片鉴定、扫描电镜等技术手段,结合物性测试数据,测井资料和压汞数据,对储层的岩石类型,孔隙类型,孔隙结构、物性特征以及储层展布进行分析。研究表明,川东北宣汉-达县地区优质储层为生物礁白云岩及鲕粒白云岩,经历过重结晶及多期溶蚀,粒间溶孔最为发育。长兴组储层孔隙度平均值为5．4％。渗透率平均值为93．41×10^-3μm^2;飞仙关组储层平均孔隙度为8％,平均渗透率为132,76×10^-3μm^2,孔喉结构良好。沉积相控制储层的岩石类型和展布,成岩作用尤其是溶蚀作用控制着储层的物性,而构造作用对储层的形成则有双重影响。  相似文献   

皖南南山钨钼多金属矿地质特征及控矿因素     

蔡连友  翁望飞  韩顺道 《华北地质》2011,34(4):290-298

南山钨钼多金属矿是皖南近年来的找矿成果之一。矿体主要赋存于岭脚黑云母花岗闪长岩体北、南部变质接触带内的寒武系杨柳岗组和震旦系兰田组地层内。矿床的形成得益于岭脚岩体的侵入,促使钨、钼等元素大量进入热水溶液,形成含矿流体,同时伴随着北东向断裂的活动,矿液得以运移至由成分复杂的碳酸盐岩矽卡岩化形成的角岩类中富集成矿。南山钨钼矿床是岭脚岩体的侵入作用、热液蚀变作用、围岩条件、热液运移和区域构造活动等因素综合作用的结果,是受一定层位控制的接触变质-中高温热液充填交代型矿床。本文中,笔者通过对南山钨钼矿床地质特征及控矿因素和矿化富集规律的分析,总结了区域上寻找该类矿床的找矿标志,为皖南地区进一步的地质找矿提供实践经验和理论依据。  相似文献