三角洲平原上网结河的发育与聚煤作用

龙潭组上段（２４＃煤顶板到１２＃煤）是盘县地区含煤最好的层段，对该区西北部本段地层的研究表明其中发育有网结河体系。河道沉积由多层叠置的鞋带状砂体组成，湿地沉积主要由菱铁质泥质岩夹薄层板状细砂岩（决口扇沉积）和煤组成。河流的发育和聚煤作用都显示幕式性，可能主要受海平面变化的控制。网结状河道被认为是海侵期对低位下切河谷充填过程中经侧向冲裂水道并相互连通形成的；稳定、连续的厚煤层发育于河道大范围废弃后的海侵晚期，其次是高水位早期。     

评价储层含油性的热解参数校正方法及其应用

评价储层含油性时，热解参数Ｓ１＋Ｓ２是一项有效参数。其中Ｓ２相对稳定，Ｓ１则随样品类别或露置时间的不同而发生变化。岩心样品的随钻解分析值比较接近真实，岩屑和井壁取心样品的Ｓ１会明显损失。而目前多数探井心进尺少，大多为岩屑录井。     

吉南地区马达岭组的时代重新厘定及其意义

吉林地区的马达岭组为一套河流相紫色、紫红色砂砾岩，前人曾先后将其置于中侏罗世、晚株罗世、新元古代、古元古代。但由于缺少直接或间接的地质证据及同位素年龄资料，故其时代问题一直悬而未决。１９９１￣１９９３年笔者等在红土崖幅（１／５万）进行区调工作，发现了青白口纪的鱼台组不整合覆于马达岭组之上，根据层序学的理论分析，马达岭组应属新元古代海侵早期深切河谷沉积。故将其时代置于青白口纪早青白口世。     

陕西岚皋地区早志留世滔河口组的厘定及其意义

陕西南部北大巴山地区早志留世滔河口组碱基性火山岩，分布层位稳定，岩性标志特征。根据火山岩岩石类型和地层学以及古生物组合特征对其岩石地层单位重新进行了厘定，研究了火山岩的成因，探讨了火山岩形成的机制和构造环境。     

陕西凤县庞家河金矿床基本地质特征及成矿作用分析

阐述了庞家河金矿床的地层、构造控矿特征，研究了矿床的化学成分、微量元素及矿体、矿石的基本特点，分析了矿石及矿石矿物黄铁矿的O、S、Pb稳定同位素组成；认为庞家河金矿的成矿介质水为同生建造水，成矿物质来源于围岩上沉盆统下东沟组，矿床类型为热水溶滤成因的微细浸染型。     

塔里木北部地区三叠系储层溶蚀作用机理

塔里木北部地区三叠系储层在成岩演化过程中曾经历两期溶蚀作用，深埋成岩环境的晚期溶蚀较早期近地表－浅埋成岩环境溶蚀要剧烈得多，溶蚀作用的最大特点是铝硅酸盐矿物较碳酸盐矿物剧烈。溶蚀作用发生的机理是由于三叠系储层处于８０～１２０℃热窗、成岩流体富含低分子量羧酸、碱度由低分子量羧酸控制，铝硅酸盐和碳酸盐矿物均处于去稳定状态。溶蚀作用的发育程度受控于储层砂体的沉积和岩石学特征以及早期成岩发育程度。     

华北地台中寒武世米级旋四层序与复合海平面变化

笔者在对华北地区中寒武统颐滩碳酸盐建造露头层序地层学研究工作中首次识别出层序中最基本的地层单元──米级旋回层序，它是露头层序分析最基本的工作单元。本文总结概括出不同体系域内米级旋回层序类型和特征。这些米级旋四层序在塞向上叠加构成高级（五级、四级、三级）旋回层序时表现出周期性和规律性。这种不同级次的旋回层序的形成受不同动力成因引起的具不同周期和频率复合海平面变化的控制。米级旋回层序的识别与复合海平面变化的研究得出中寒武世鲕滩层序的形成经历了若干次周期性的淹没－间断－均衡堆积－加积进积事件，这为盆地充填史的恢复提供了新途径。     

New palaeomagnetic data from Central Iran and a Triassic palaeoreconstruction

New pole positions for Triassic and Cretaceous times have been obtained from volcanic and sedimentary sequences in Central Iran. These new results confirm the general trend of the Apparent Polar Wander Path (APWP) of the Central-East-Iran microplate (CEIM) from the Triassic through the Tertiary as published by Soffel and Förster (1983, 1984). Two new palaeopoles for the Triassic of the CEIM have been obtained; limestones and tuffs from the Nakhlak region yield a mean direction of 094.0°/25.0°, N=12, k=4.1,α ₉₅=24.7°, after bedding correction, corresponding to a palaeopole position of 310.8°E; 3.9°S, and volcanic rocks from the Sirjan regions yield a mean direction of 114.5°/35.1°, N=44, k=45.9,α ₉₅=3.2° after bedding correction and a palaeopole position of 295.8°E; 10.3°N. Combining these with the two previously published results yields a new palaeopole position of 317.5°E; 12.7°N, for the Triassic of the CEIM, thus confirming that large counterclockwise rotations of the CEIM have occurred since the Triassic time. New results have also been obtained from Cretaceous limestones from the Saghand region of the CEIM. The mean direction of 340.7°/26.3°, N=33, k=44.3,α ₉₅=3.8°, and the corresponding palaeopole position of 283.1°E; 64.4°N, is in agreement with previously determined Cretaceous palaeopole positions of the CEIM. Furthermore, results have also been obtained from Triassic dolomite, limestone, sandstone and siltstone from the Natanz region, which is located to the west of the CEIM. A total of 161 specimens from 44 cores taken at five sites gave a mean direction of the five sites at 033.3°/25.1°, N=5, k=69.0,α ₉₅=9.3° and a palaeopole position of 167.2°E; 53.7°N. They pass the positive fold test of McElhinny (1964) on the level of 99% confidence. This pole position is in fairly good agreement with the mean Triassic pole position of the Turan Plate (149°E; 49°N). It indicates that the area of Natanz has not undergone the large counterclockwise rotation relative to the Turan plate since the Triassic, which has been shown for the CEIM. A Triassic palaeogeographic reconstruction of Iran, Arabia (Gondwana) and the Turan Plate (Eurasia) is also presented.     

陕西蓝田地区新第三纪地层划分的几点讨论

蓝田地区灞河组和蓝田组的时代归属是我国三趾马动物群分期的关键问题之一。通过与府谷老高川三趾马动物群的对比及古地磁测定，该区新第三纪地层可分为上新统静乐组（原蓝田组上部）、蓝田组（原蓝田组下部）和灞河组．蓝田组的地质时代可归保德期庙梁亚期，地质年龄约为距今５．３—５．０Ｍａ期间．灞河组的地质时代可与喇嘛沟动物群的对比，为保德早期或稍早．     

New Evidence for Eastward Extension of Late Hercynian－Early Indosinian Qinling Sea

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