陇东地区水土流失与地质作用初步分析          下载免费PDF全文

窦润吾 《甘肃地质》2003,12(1):92-96

陇东地区是黄河上游水土流失严重区 ,也是国家重点治理的地区之一。由于特殊的岩土体的存在 ,加重了这一地区水土流失作用的危害性。本文通过水土流失现象与地质作用的关系进行偿试性探讨 ,旨在从中找到防治水土流失的有效措施 ,开展治理工作  相似文献   

浅析湘南地区锰矿矿源物质来源     

李雪 《湖南地质》2003,22(1):19-23

简述湘南地区表生氧化锰矿矿源层的分布及岩性特征，讨论矿源层与构造及岩相古地理的关系。  相似文献   

Geochemical Characteristics of Gold Polymetallic Deposits as Exemplified by the Laozuoshan Deposit,Heilong jiang,China     

代立东  李和平  王思源  魏俊浩 《中国地球化学学报》2003,22(1):89-96

From the studies of ore deposit geologic settings,sulfur isotopes,lead isotopes,carbon isotopes and oxygen isotopes,fluid inclusions and petrochemistry in this paper,the authors have drawn a conclusion that the ore-forming hydrothermal solutions are the high-temperature magmatic hydrothermal solutions for the gold ore deposit,and at the same time,the involvemety of crustal materials can not be ruled out .It is the first time that the authors have proposed that the Laozuoshan gold-ploymetallic ore deposit in Heilongjiang Province was formed in the calc-alkaline series environment at the margin of an active continent.  相似文献   

The Paleo－Environmental Significance of Sr and Ca Contained in Acid－Soluble Fraction of Plateau Loess Deposits in Xining Basin     

谭红兵  马海州  鹿化煜  张西营  魏海珍 《中国地球化学学报》2003,22(2):156-163

The Xining Basin,located on northeastern Qinghai-Xizang Plateau,is adjacent to the Qaidam Bsim and Gobi-desert.Therefore,thick,integrated deposits of loess or paleo-sol sequence were well developed.As is well known,there is much paleo-environmental information recorded in loess and plaeo-sol.So if we deal with paleo-environmental index from different an gles ,especially from loess geochemistry,some important and detailed paleo-environmental evolutional information will be acquired.Based on this,the authors determined the contents of Sr and Ca contained in acid-soluble fraction from the bottom to the top of the Panzishan section.This section was obtained through making a well about 17 m in depth,including S1 paleo-sol that was developed during the last interglacial period.According to the results,it is found that variations in contents of Sr and Ca are well correlated with conversion of loess and paleo-sol.In loess deposits,the contents of Sr and Ca are higher than those in paleo-sol deposits.It is known that loess was deposited under cold-dry climate conditions and paleo-sol was developed during warm-humid climate episodes.It is concluded that due to their mobile behaviors,under cold-dry climate conditions,Sr and Ca are stagnant during weak weathering,but under warm-humid climate conditions,Sr and Ca are easily leached and transported in aqueous solution.Therefore,they can be utilized as indicatiors of climate changes.Moreover,variations in contents of Sr and Ca are more sensitive than susceptibility.The mobile behaviors of Sr and Ca contained in acid-soluble fraction can serve as a new quantitative index to evaluate paleo-environmental changes on the plateau.  相似文献   

Geology, Geochemistry and Genesis of the Hongshijing Gold Deposit in Ruoqiang,Xinjiang     

肖惠良  周济元  王鹤年  崔炳芳  陈世忠 《中国地球化学学报》2003,22(3):280-288

1IntroductionTheHongshijinggolddepositislocatedinthenorthofLuobupouLakeofRuoqiang ,about 30 0kmsouthwestofHamiCity ,Xinjiang .ItwasdiscoveredbytheSixthGeologicalTeamofXinjiangduringgeo chemicalexploration .TheHongshijinggolddeposit,whichoccursinthegold bearingformationcomposedofMiddleandLateCarboniferousvolcanicandpyroclasticrocks ,isabrittle ductileshearzonetypegolddepositcontrolledbyariftbelt.TheHongshijinggolddepositislocatedinthesouthwestoftheHongshi jing -Maotoushanmineralizationb…  相似文献   

活动断裂引发的环境地质问题及措施     

王生力韩振富  刘唐生裘平一 《城市地质》2003,15(3):23-26

随着经济的飞速发展和现代化建设的加快，全社会防灾减灾意识的增强，在国土规划、抗震规划及高、深、大型工程项目的建设中，对活动断裂的研究，已成为勘测、设计中的重要课题。本文就影响张家口市城市安全的活动断裂的类型、空间展布、活动特征、引发的环境地质灾害及工程对策等予以阐述，为城市规划提供依据。  相似文献   

WZY-1型钻参仪的研究与应用   总被引：1，自引：0，他引：1  

补家武  补生蓉  李吉春 《探矿工程》2003,30(2):35-37

分析了目前钻参仪未能普遍推广应用的原因。介绍了WZY－1型钻参仪的总体构成、测试参数、性能特点及其分别与钻机和水泵的一体化设计。  相似文献   

新疆东天山沙泉子地区化探遥感综合找矿信息与金矿成矿预测     

徐国端  杨自安 《地质与勘探》2003,39(6):21-24

沙泉子测区是东天山地区觉罗塔格成矿带中很有前景的成矿远景区，具有形成与酸性侵入岩有关的金矿床的前景。在对区域成矿地质条件的综合研究基础上，通过对化探和遥感找矿信息的综合分析，圈定了4片具有金矿成矿地质异常的找矿靶区，其中沙泉子北东14km处为一最佳找矿靶区。  相似文献   

个旧锡矿区构造岩稀土元素特征及其找矿意义   总被引：3，自引：0，他引：3  

马德云陶琰  高振敏张欢 吴学益 《地质与勘探》2003,39(6):37-38

个旧锡多金属矿床明显受断裂的控制。断裂(裂隙)的构造岩分析结果表明，构造岩稀土元素的特征与矿石一致，且它们有相同的来源，而与围岩具有明显的差别。矿区强烈的花岗岩岩浆汽热活动造成构造岩的稀土明显富集。根据稀土元素的分布异常圈定了隐伏矿床(体)找矿靶区，经钻孔验证已见成效。  相似文献   

闽南沿海地质灾害防治对策   总被引：3，自引：0，他引：3  

苏志辉  陈旭辉 《地质灾害与环境保护》2003,14(1):1-3

根据闽南沿海环境地质条件，提出了五条地质灾害的防治基本要点；又据要点，结合本区主要的环境地质问题的实际问题，提出五点防治对策与建议。  相似文献