济阳坳陷上第三系馆陶组上段沉积相研究

利用地质资料、测井资料、地震资料及分析化验资料对济阳坳陷上第三系馆陶组上段岩相古地理特征进行了全面系统地研究。首先从岩性、沉积结构和构造、砂体形态、电性特征、地震反射等方面论证馆陶组上段为山麓洪积相和河流相沉积，其中它们又可进一步细分为10种亚相或微相。其次，详细论述了沉积相的平面展布，同时还指出了油气分布与沉积相带的关系。此外，本文还指出馆陶组上段沉积期的物源方向、河流流向、最终汇水区及当时的古气候条件等。     

Trona resources in southwest Wyoming

Bedded trona (Na₂CO₃·NaHCO₃·2H₂O) in the lacustrine Green River Formation of Eocene age in the Green River Basin, southwest Wyoming, constitutes the largest known resource of natural sodium carbonate in the world. In this study, 116 gigatons (Gt) of trona ore are estimated to be present in 22 beds, ranging from 1.2 to 11 meters (m) in thickness. Of this total, 69 Gt of trona ore are estimated to be in beds containing less than 2 percent halite and 47 Gt in beds containing 2 or more percent halite. These 22 beds underlie areas of about 130 to more than 2,000 km² at depths ranging from about 200 m to more than 900 m below the surface. The total resource of trona ore in the basin for which drilling information is available is estimated to be about 135 Gt.Underveloped trona beds in the deeper southern part of the basin may be best developed by solution mining. Additional unevaluated sodium carbonate resources are present in disseminated shortite (Na₂CO₃·2CaCO₃) in strata interbedded with the trona and in shallow sodium carbonate brines in the northeast part of the basin. Estimates of the shortite and brine resources were not made.     

山东淄博晚石炭世双壳类动物群及其古生态特征

本文记述了采自山东淄博地区晚石炭世太原组双壳类化石１５属２８种，讨论了化石组合特征．在研究双壳类动物群的基础上，划分了３个动物群落，即：Ａｃａｎｔｈｏｐｅｃｔｅｎ群落、Ｐａｌａｃｏｌｉｍａ群落和Ａｉｔａｒｔｅｌｌａ群落，并对各群落的生态特征进行了系统研究．     

化脓性脊柱炎影像学诊断(附23例分析)

笔者报告了23例化脓性脊柱炎。本文着重分析对比了X线平片和CT检查结果,通过分析对比,发现CT检查优于X线平片,并有助于对化脓性脊柱炎早期作出诊断。主要影像学表现:早期,软组织肿胀和脓肿形成,骨质呈虫蚀状破坏,随之破坏区周围出现增生硬化。CT 还能发现炎块中的气体。晚期,骨质修复占优势,即骨质增生硬化,骨桥形成,最后可产生骨性融合。     

Comparative analysis of cladoceran microfossils in the Don and Scarborough Formations,Toronto, Canada

Pleistocene deposits at Toronto, consisting of Don Formation (considered to be of Sangamonian interglacial age) and Scarborough Formation (interpreted to be Early Wisconsinan, >50 000 years B.P.) were examined at three sites: Don Valley Brickyard, Leaside, and at the south end of Brimley Road at the foot of the Scarborough Bluffs. Comparison of the cladoceran microfossil assemblages described from these sites has enabled reconstruction of the lacustrine environment of the region.Cladoceran microfossil evidence from each site confirmed the disparity in community composition and structure, and in environmental conditions that existed during deposition of the Don and Scarborough Formations. Cladocera community composition averaged 40–45% remains of littoral species in the warmer Don interval at all three sites. The Scarborough Formation contained a more homogeneous cladoceran assemblage, with higher community similarity across sites than observed in the Don Formation. However, there was greater variation in the littoral: planktonic ratio among sites, ranging from >0.90 at Leaside to <0.10 at Brimley Road.Stratigraphically constrained cluster analysis of cladoceran microfossil assemblages clearly separated the communities in the Don Formation from those in the Scarborough Formation at each site. During the interglacial, the Don Brickyard site appears to have been a shallow, protected embayment on the lake shore, whereas the other sites are more distinctly lacustrine. The Scarborough assemblage at each site is representative of deeper, oligotrophic, subarctic lakes.     

辽南晚前寒武纪地层中的宏体化石之地层意义的探讨

辽南地区晚前寒武纪地层中多层位宏体化石的发现,使序列更完善。根据化石生物机体的复杂程度,可列入前冰期的辽南系,它介于震旦系和青白口系之间。其南关岭组的宏体化石组合类似淮南地区的九里桥组,提高了两区的晚前寒武纪地层的对比度。复州湾沙山村赵家坎子剖面再次证明大连市南、北部晚前寒武纪地史发育的一致性及原区调队等单位对地层叠接的正确性。     

雷州半岛局部地热异常及其形成机制

雷州半岛地热场主要受基底构造格局的控制和地下水活动的影响,隐伏花岗岩体放射性元素生热对盖层地温的贡献不可忽视,第四纪更新世火山喷发活动的岩浆余热已几乎完全散失,岩浆体和围岩温度已趋于平衡。由火山喷发而形成的雷北螺岗岭和雷南石峁岭两个玄武岩台地,为半岛地下水的主要补给区,由于冷水流下渗的地温效应,新生界盖层浅部地温梯度<3℃/100m,呈现地热负异常。在以传导传热为主的区域,地热场特点与华北盆地相似,新生界盖层地温梯度与基底岩面的埋深密切相关。由于地壳深部较均一的热流在地壳表部再分配的结果,若干凸起区盖层地温梯度为4—5℃/100m,呈现地热正异常。某些控制凸起区的边界断裂,当深层热水沿其上涌,造成附加热源,和传导传热相叠加,盖层地温梯度可高达5—8℃/100m,形成更鲜明的地热正异常。     

邵东保和堂大冶灰岩沉积构造特征

保和堂大冶灰岩中发育丰富的沉积构造,对之研究有助于保和堂、乃至整个湘中的大冶灰岩形成环境的探讨。其第一段岩石发育了丘状波痕、丘状交错层理及粒序层理,是风暴作用的反映;泥裂、水雹痕属于暴露环境。说明大冶灰岩沉积的早期仍属潮上或潮间碳酸盐台地相。中期海水加深,发育了水平层理、变形层理及包卷层理等,近于台地边缘斜坡相。晚期的粒序层理、虫迹等构造,反映了海水再度变浅的趋势。