塔里木及邻区晚古生代早期古气候与构造

影响塔里木及邻区晚古生代早期气候的地球内部因素为古昆仑和南天山两个古洋盆封闭及有关的两条缝合构造带演化，从而形成上述时空段内热带海洋气候、热（亚热）带季风气候、热带沙漠气候以及热带滨岸干湿气候区域的更替，古气候特征的判断主要依据古地磁数据、古生态气候学、沉积环境诸方面。     

不整合界限地层单位确立及划分的重要意义──兼论华北地层区不整合界限地层单位的划分和命名

在进行岩石地层划分时，有必要进行不整合界限地层单位的划分。不整合界限地层单位是顶底以不整合界面为限，而由有关联的若干个基本岩石地层单位──组（群）组成的组合。和岩石地层单位一样，是自然界存在的客观实体。初步建议华北地区划分为８个不整合界限地层单位：桑干河序列、五台山序列、滹沱河序列、秦幽序列、冀鲁序列、三晋序列、燕辽序列、河海序列。不整合界限地层单位的划分、确立，是进行地层格架分析、进行层序地层学研究的前提，有利于以岩石地层单位（即以不整合界限地层单位）编制小比例尺地质图。     

Structural studies and their bearing on the Early Precambrian history of the Dharwar tectonic province,southern India

In the Dharwar tectonic province, the Peninsular Gneiss was considered to mark an event separating the deposition of the older supracrustal Sargur Group and the younger supracrustal Dharwar Supergroup. Compelling evidence for the evolution of the Peninsular Gneiss, a polyphase migmatite, spanning over almost a billion years from 3500 Ma to 2500 Ma negates a stratigraphic status for this complex, so that the decisive argument for separating the older and younger supracrustal groups loses its basis. Correlatable sequence of superposed folding in all the supracrustal rocks, the Peninsular Gneiss and the banded granulites, indicate that the gneiss ‘basement’ deformed in a ductile manner along with the cover rocks. An angular unconformity between the Sargur Group and the Dharwar Super-group, suggested from some areas in recent years, has been shown to be untenable on the basis of detailed studies, A number of small enclaves distributed throughout the gneissic terrane, with an earlier deformational, metamorphic and migmatitic history, provide the only clue to the oldest component which has now been extensively reworked.     

论界牌峪地区“陀状”角砾岩成因及找矿意义

湖南石门界牌峪地区存在大量的所谓“陀状”角砾岩，它们互不相连，外观圆形，有的聚集成群或者呈完全孤立的山包。角砾岩地表多为椭圆状和等轴状，与围岩多呈刺穿状接触。通过地质学、岩石学和地球化学等方面研究，认为该区“陀状”角砾岩是一种由热泉气体及部分物质在封闭还原条件下产生急剧爆发所形成的特殊的角砾岩群。它们是一种极好的容矿控矿体，具有重要的找矿意义     

山东文登金矿成矿动力学研究

本文通过古应力估算，流体包体研究，应变测量以及矿化蚀变规律研究，探讨了山东文登金矿的动力作用与金成矿的主要关系，认为构造动力作用的金成矿的主要原因，韧性剪切作用向韧－脆性变形作用的过渡过程是金成矿的必要条件之一。     

杨溪岩体中黑云母的特征及其地质意义

杨溪岩体黑云母为１Ｍ型的铁质黑云母，其特征说明岩体为壳源改造型花岗岩，但有幔源物质混入。离铌钽矿化点较近的黑云母表现出明显富铝、多锰、贫镁、少硅、少钛的特点。离白钨矿矿区较近的黑云母与远离矿区的黑云母在特征上差别不大，说明杨溪岩体黑云母的特征变化对成矿影响不大，但岩浆活动是重要的成矿因素之一。     

鄂西娄山关组顶部古岩溶不整合面的发现及层序地层学意义

鄂西娄山关组顶部存在古岩溶不整合面，有众多陆上暴露和溶蚀标志，表明其产生受寒武纪末海平面下降事件的控制。它不仅形成了碳酸盐台地上典型的Ⅱ型层序界面，而且恰与寒武—奥陶纪年代地层界线相重合，体现了层序界面、年代界线和事件界线三位一体的有机结合     

晋南地穹列煤层气赋存区构造应力分析

根据晋南地穹列构造型相分析，恢复了4期应力场：①地洼初动期（印支期）近S－N水平挤压；②地洼激烈期（燕山期）NWW－SEE水平挤压；③地洼余动期（喜山早期）NNE－SSW水平挤压；④地洼余动期（喜山中期）NW－SE、NWW－SEE近水平伸展。其现代构造应力场以NW－SE向伸展应力场为主，但在沁水地穹则表现为NEE－SWW向近水平挤压应力场。有限元模拟分析证实：此局部挤压应力场的动力来源于挽近地质时期太行山和霍山的隆起与抬升，临汾地洼和太原地洼中的伸展应力场则与地洼壳体下部慢源物质逸散所导致的侧向拉伸有关。区内应力降的分布特点与晋南地穹列断裂构造发育程度具有良好的对应相关性，在高应力降区，单位体积煤层气含量显著高于其它地区。模拟主应力差等值线图中两个高主应力差值区恰好与东部沁水地穹中两个高含气量区相对应，充分说明地洼余动期构造应力场中高压应力区是煤层气富集的有利地区。     

Separate Analysis of Remote Sensing Information of Structures of Different Geological Periods and Quantitative Study of Corresponding Tectonic Stress Fields

The structural feature shown on a remote sensing image is a synthetic result ofcombination of the deformations produced during the entire geological history of an area.Therefore, the respective tectonic stress field of each of the different stages in the complexdeformation of an area can be reconstructed in three steps: (1) geological structures formed atdifferent times are distinguished in remote sensing image interpretation; (2) structuraldeformation fields at different stages are determined by analyzing relationships betweenmicrostructures (joints and fractures) and the related structures (folds and faults); and (3)tectonic stress fields at different stages are respectively recovered through a study of the featuresof structural deformation fields in different periods. Circular structures and related circlular and radial joints are correlated in space to con-cealed structural rises. The authors propose a new method for establishing a natural model ofthe concealed structural rises and calculating the tectonic stress field by using quantitative dataof the remote sensing information of circular structures and related linear structures.     

Changchengite—A New Iridium Bismuthide-Sulphide from the Yanshan Mountains

Changchengite occurs in chromite orebodies in dunite and in platinum placer deposits in chromite orebodies nearby. The mineral occurs as massive aggregates or veinlets on margins of iridisite (IrS2) and replaces it. Opaque. Lustre metallic. Colour steel-black. Streak black. Hm = 3.7. VHN20= 165 kg/ mm2. Isotropic. Cleavage none. Density 11.96 g/ cm3. Seven electron microprobe analyses give the following mean chemical results (wt. %): S 7.2, Cu 0.3, Te 0.4, Ir 41.2, Pt 2.8 and Bi 47.3 with total 99.1. The simplified formula is IrBiS. The strongest X-ray powder diffraction lines (hkl, d, I) are 210, 2.75 (70); 211, 2.51 (60); 311, 1.860 (100); 440. 1.090 (50) and 600, 1.027 (50). The X-ray powder diffraction pattern is similar to that of mayingite. After the diffraction data are indexed the mineral is determined to be cubic. The space group is P213 with a = 0.6164(4) nm, V = 0.2342 nm3 and Z = 4.