Study on failure mechanism of a plain irrigation reservoir soil bank slope under wind wave erosion

Natural Hazards - The wind wave erosion is one of the main factors of the soil bank slope retreat in plain irrigation reservoirs, which plays an important role in the bank profile evolution and...     

由计算机产生的等距离区域分界线

本文介绍一种最近由作者在美国研制的,由计算机产生等距离区域分界线的程序及其数据结构,同时给出初步的试验结果。     

麻粒岩p—T—t轨迹的研究现状

综述了近年来麻粒岩中p-T-t轨迹的研究现状。内容涉及到麻粒岩相变质作用的温压条件及时间跨度,同时指出:结合岩石中的矿物组合、后成合晶及反应结构,利用矿物温压计是目前确定p-T-t轨迹的主要手段。     

湘南多金属矿床方解石形态及表面微形貌的研究

对湘南多金属成矿区方解石的研究表明，产于钨矿床中的方解石以层状晶体发育为特征，晶体形态主要为｛０００１｝和｛０１２｝＋｛１０１０｝，晶体表面具有菱形生长阶梯；产于铅锌矿床中的方解石一般不出现层解石，晶体形态主要为｛２１３１｝，｛０１１２｝＋｛１０１０｝和｛０００１｝＋｛１０１０｝＋｛０１１２｝，晶体表面平行纹发育；远矿正常灰岩内方解石晶体形态主要为｛４０４１｝。     

The Songpan-Garzê Massif: Its Relation to the QinlingFold Belt and Yangtze Platform and Developmental History1

Abstract Whether there existed the Songpan-Garzê massif is a controversial problem. This paper expounds and proves that the old basement of the massif is represented by the pre-Sinian granitic rock series. This massif and the South Qinling fold belt might both be a part of the old Yangtze platform. Rifting generated by the Caledonian orogeny in the terminal Early Palaeozoic caused the massif to be disintegrated from the northwestern part of the Yangtze platform. This disintegration, however, was not thorough, and the rift troughs were later gradually closed and filled up. The Emei taphrogeny that was initiated in the Early Permian Maokou'an Stage involved a second disintegration of this massif from the Yangtze platform. The rift line largely goes along the Muli-Pingwu line. This rifting belongs to synchronous extensional rifting at peripheries of the Yangtze platform and in its interior, showing that the posterior, lateral and interior extension resulting from rapid northward shift of the Yangtze platform led to isolation of this massif together with South Qinling from their adjacent areas. During the Ladinian Stage, the Songpan-Garzê massif and southern Qinling sank strongly en masse. This subsidence continued till the end of the Late Triassic when the late Indosinian movement caused the sea trough to be closed and Songpan-Garzê and southern Qinling to be folded and uplifted and become mountains.     

吉林省夹皮沟金矿地质特征及成因探讨

夹皮沟金矿产于晚太古宙绿岩带的下部层位。北西向的韧性剪切带控制着金矿田和矿床分布,而矿体主要受叠加于韧性剪切带之上的脆性断裂构造制约。金主要来源于围岩。华力西晚期—燕山早期为主要成矿期。属多源、多期的叠生型金矿床。     

宝山铜钼多金属矿田矿化分带和蚀变组合特征

宝山多金属矿田的矿化产于下石炭统石磴子组灰岩中。以宝岭倒转背斜轴为核心,矿田中部是由矽卡岩型铜钼矿床红组成的铜钼矿带,向外是由多个铅锌银矿床组成的铅锌跟矿带。笔者通过铜钼矿石和东部铅锌银矿石的化学成分,矿物组合及黄铁矿、黝铜矿的标型特征,探讨了宝山多金属矿田的矿化及蚀变组合分分带,并以此作为同类型矿床的找矿标志。     

乳砷铅铜石的发现与研究

乳砷铅铜石发现于1984年,在广西德保和平桂等矿区的硫化物型矿床的氧化带铁帽中.对该矿物的物理、化学和X射线粉晶分析、红外光谱分析以及差热分析等方面进行了测试研究,其结果与国外已知数据基本一致.矿物呈淡黄绿或深绿色,细粒状或葡萄状,硬度H=4,比重D=5.35,透明,二轴晶负光性,2V大,Ng=1.9817,Nm=1.9703,NP=1.9584.化学成分为PbO 35.19,CuO 30.64,As_2O_5 30.09,FeO 0.28,ZnO 0.05,H_2O 4.10(%).相应的化学分子式为Cu_(2.96)Pb_(1.21)(AsO_4)_(2.01)(OH)_(2.31)·0.59H_2O.X射线粉晶数据与JCPDS26～1410卡基本一政,衍射强线为3.14(10),3.24(8),2.92(8),2.55(8),2.74(7),2.49(7),2.27(7),4.51(6),4.94(5),2.66(4),1.902(4),1.817(4).计算的晶胞参数为a=10.236(?).b=5.904(?),C=14.213(?),β=106.39°,z=4,单斜晶系;空间群为A2/a.红外吸收光谱波数为3440、1640、870、820、775、465和1100、590、557(cm~(-1));差热分析吸收峰为580、773、812、889、898(℃).     

绿砷钡铁石在广西的发现

本文研究了在广西德保铜锡矿床氧带化中发现的绿砷钡铁石,给出了它的物理性质、化学成分和晶胞参数等矿物学数据。     

Generation of Muscovite/ Two-Mica Granil and Intracontinental Subduction

ＧｅｎｅｒａｔｉｏｎｏｆＭｕｓｃｏｖｉｔｅ／Ｔｗｏ－ＭｉｃａＧｒａｎｉｌａｎｄＩｎｔｒａｃｏｎｔｉｎｅｎｔａｌＳｕｂｄｕｃｔｉｏｎ￥ＤｅｎｇＪｉｎｆｕ；ＺｈａｏＨａｉｌｉｎｇ；ＬａｉＳｈａｏｃｏｎｇ；ＬｉｕＨｏｕｘｉａｎｇ；ＬｕｏＺｈａｏｈｕａ（Ｄｅ...