内蒙古额济纳旗辉森乌拉金矿地球物理、地球化学特征

额济纳旗辉森乌拉金矿产于华力西晚期二长花岗岩体外接触带之二叠系上统哈尔苏海组地层。矿体呈层状、似层状,严格受岩体和地层特定层位控制。矿体为华力西中晚期构造—岩浆活动的产物。激电异常显示为低阻高极化特征,化探异常以Au、W为主,元素异常强度高,为矿致异常。     

激发极化法在内蒙古乌兰德勒钼矿上的应用

在乌兰德勒钼(铜)矿勘查过程中,激发极化法起到了很重要的的作用,激电中梯测量在面上圈定极化体范围,激电测深确定极化体产状及埋深,取得了该区深部不同空间的地质成矿信息,激电测量对深部找矿具有指导意义,通过钻探验证并取得了良好的地质效果,低阻、高极化是该区深部找矿的有效标志。     

河北省丰宁县大窝铺——金秀营子一带找矿远景分析

矿区位于河北省丰宁满族自治县苏家店乡大窝铺——金秀营子一带,通过对矿区的野外地质施工,确定以下三个找矿标志和两个找矿方向。找矿标志:(1)地质标志:大窝铺区找矿标志为北东向断裂带,铁锰染、硅化、黄铁矿化发育地段;金秀营子区找矿标志为绿泥石化——高岭土——裂隙构造破碎带,地表具有褐铁矿化;(2)地球物理标志:金秀营子区内进行了1∶5000激电扫面测量,圈出一条走向为南北向的异常带IP1。该激电异常的规模、形态与矿化蚀变带吻合,依据异常特征,认为该异常可能是由深部含Ag、Pb、Zn等金属硫化物的极化体引起;(3)地球化学标志:综合两个钻孔化探原生晕异常情况,成矿元素垂直分带大致为:上部Au、Ag,中部Ag、Pb、Zn,下部Zn。从相关系数矩阵表分析,Mn元素与Sb和Hg元素相关性较强,认为本区地表的Mn矿化和Mn染对找矿有较好的指示作用。找矿方向:(1)矿区各蚀变带矿化的强弱顺序:强绿泥石化带→绿泥石化带→硅化绢云母角砾岩带→石英网脉带→糜棱岩化带,因此在本区以寻找绿泥石化带与硅化绢云母角砾岩带为主要找矿方向;(2)主要针对研究区圈出的激电异常IP1,进行深部钻探验证,该异常处于矿化蚀变带上,可能是由深部含Ag、Pb、Zn等金属硫化物的极化体引起。     

内蒙古自治区乌兰察布市红红梁地区找矿远景分析

通过对乌兰察布市红红梁地区控矿规律研究及1∶1万土壤地球化学测量,圈定Au、Ag、Cu、Zn、Ni、W、Bi、Mo等综合异常4处,Au最高值2995×10~(-9),主要分布于都拉哈拉组、尖山组地层中,受尖山组中的北东向断裂构造带控制明显。采用激电中梯测量查证异常,物探异常显示激电异常与磁异常套合较好,异常可能为矿致异常。经槽探揭露,发现金矿体2条,铁矿体1条,铁矿化体1条,该区成矿地质条件有利,找矿前景较好。     

物探综合方法在登吉屯铜矿勘查中的应用研究

登吉屯重点工作区已取得一定的找矿进展,圈定了较多的铜矿体或矿化体,但工作区矿化普遍较弱,矿体或矿化体规模普遍较小。通过在矿区开展1∶5000高精度磁测、激电中梯综合剖面测量,激电测深查证工作,结合已有地质、物化探资料,初步预测矿区中部和东部黑云母花岗闪长斑岩深部可能有较大的找矿潜力,另外位于矿区西部的IP-1物探高极化异常,也应作为下步找矿的重点部位。     

内蒙古自治区扎鲁特旗巴格贝银铅锌多金属矿综合勘查效果

内蒙古自治区扎鲁特旗巴格贝银铅锌多金属矿成矿条件好,本文利用音频大地电磁(AMT)及瞬变电磁测深法(TEM)多种物探手段进行了勘查,通过结合已有磁法、电测深成果及矿区地质特征分析了深部低阻、高极化特征的隐伏矿体及其分布范围,预测了找矿有利部位,钻孔验证在低阻异常区见工业铅锌银多金属矿体,证实综合勘查方法在本区取得良好的找矿效果,为邻区类似矿产勘探提供参考。     

联合剖面法和激电测深在旌德庙首地区的应用效果

通过本次及前期激电联合剖面测量所得ρs正交点,能够较好反映低阻体的存在,依据联合剖面测量所获低阻正交点位置,推测出F3构造北东向次级构造破碎带2条.根据第四系浮土、岩体与砂岩接触带的电性差异,判定出了1条砂岩与岩体的边界线,该边界与地质上圈定的岩体接触带基本吻合.     

丰镇市豆角山银铅锌矿地质特征

丰镇市豆角山银铅锌矿地质特征主要从地层、岩浆岩、构造、地球化学、地球物理及矿体特征六个方面进行归纳叙述。矿（化）体赋存在中生代中酸性火山次火山岩中,呈层状似层状。品位变化不大,但构造裂隙发育的地段矿体品位较高,矿化普遍,围岩与矿体界线不清,矿化体与激电异常吻合较好,呈相对低阻高极化特征。矿石类型主要表现为浸染状铅、锌硫化矿石和微细脉状铅、锌硫化矿石。围岩蚀变种类有硅化、黄铁矿化、高岭土化、绢云母化、碳酸盐化等。矿区主要控矿因素为出露的中生代陆相酸性—中酸性火山岩建造。     

双频激电法在郭家屯铀钼矿区勘查中的应用

本文主要介绍了双频激电仪的工作原理和工作方法,并结合在郭家屯铀钼矿44-02线的应用效果进行了实证分析和研究。中梯法剖面图和测深断面图显示的低阻区域与已知断裂带F376吻合。在低阻带两侧,出现不规则的团状Fs高值极化体,与已知的分散状铀钼矿化体吻合较好,证实了双频激电工作的有效性。对用该方法寻找同类矿床具有一定的参考意义。     

内蒙古兴和县曹四夭钼矿矿床类型及成因探讨

曹四夭钼矿通过河南省地质矿产勘查开发局第二地质勘查院1∶5万化探综合异常AS4-甲1进行了异常查证、矿点检查,投入的主要工作量有1∶1万地质简测、1∶1万激电测量、1∶1万土壤测量及少量槽探。其中1∶1万土壤测量结果,圈出甲类综合异常2处,其中AP1-甲1异常面积约1.0km2,但其西部、南部均未封闭,W最高值为175×10-6、Mo最高值为226×10-6,AP2-甲1异常Au最高值﹥100×10-9。在曹四夭发现了早白垩世花岗斑岩及网脉状钨钼矿化和金矿化,取样分析部分样品钨、钼、金品位大于边界品位,证明该异常为矿致异常。区内发现钼矿为隐伏盲矿体,产于少斑花岗斑岩外接触带集宁岩群黄土窑岩组浅粒岩、变粒岩中;锌矿体被新生代地层覆盖。钼及锌矿体分别位于曹四夭断裂(F1)东西两侧,锌矿体受其次级构造控制。     

Women,Politics, Elections,and Citizenship

Abstract

Significantly more women than men are registered voters in the United States, and a higher proportion of women voters actually cast ballots on election day. Yet the 106th Congress (1999-2001) includes only 56 women members, 12% of the total membership of the House and Senate. Likewise, women hold only 22% of the total seats in state legislatures. The purpose of this article is to examine this paradox. It first examines the history of the women's movement in the United States. It then turns to an evaluation of women's progress in gaining elected office. Finally it considers three primary obstacles to women gaining equitable representation: solidarity among women, political culture, and the single-member district system now employed in the United States.     

Elevation, Age, Soil Development, and Chemical Weathering at Storbreen, Jotunheimen, Norway

Chemical weathering and associated soil development trends on glacial forelands are commonly assumed to exhibit increases with time elapsed since glaciation. However, this gross trend is complicated by several other factors including elevation, aspect, and microtopography. This paper demonstrates that on the glacial foreland at Storbreen, Jotunheimen, Norway, chemical weathering and associated soil development trends show significant elevational influences. We sampled soils at shallow depths (0–1, 1–5, and 15–20 cm) at two sites on a moraine dated to 1750 at its elevational extremes of 1155 m (site L) and 1385 m (site H). The two moraine sites also differed developmentally from an adjacent 9000-year-old surface (site T) at an intermediate elevation, 1205 m. Analyses were conducted on the fine-earth fractions. Extractable elemental composition exhibited detectable differences between the same-age soils at different elevations with the lower site L tending to have measured parameters intermediate between the high site H and the older site T. Weathering, as indicated by mineralogy, was more pronounced at the 9000-year-old site T and least evident at the high elevation site H. In addition, elevation under the conditions of the field research may inhibit pedogenesis as indicated by the chemical data. Site H, for example, showed little variation with depth and had in general, less organic matter accumulation, smaller C:N ratio, greater pH, and lesser amounts of the measured extractable elements than the soil at site L. Site T generally had smaller pH and larger levels of the measured elements than the other sites. It was concluded that elevation has a significant control on weathering and pedogenesis that may mask the effects of age in this cold and wet environment.     

FANTASY,GEOGRAPHY, WAGNER,AND OPERA*

ABSTRACT. Wilhelm Richard Wagner fused fantasy based on epic and lore with seamless scores, using landscapes and urban images to forge spatial order on stage. As a footloose composer-conductor, Wagner was considered a globetrotter for his time, and from trans-European tours he drew inspiration for numerous stagings. Nine of his operas have rustic pastoral settings, with actors silhouetted against geological formations, forests, vistas of undulating terrain for pilgrimages, or raging seas, all visually believable scenery. Rienzi and Die Meistersinger von Nürnberg are urban in setting, whereas Die Feen and Das Liebesverbot are set in a castle-like format.