龙川江盆地上第三系芒棒组沉积体系与层序地层分析

龙川江盆地是造山带内部发育的新生代小型山间断陷盆地。本文结合该盆地晚新世构造、火山活动与沉积作用，对盆地盖层芒棒组沉积体系与层序地层进行了分析。通过分析，建立了龙川江盆地晚新世沉积模式，认为晚新世早期断陷带内快速堆积，主要以发育冲积扇沉积体系为特征，中、晚期冲积扇快速人湖，由此而形成冲积扇一扇三角洲一湖泊沉积体系组合；提出了龙川江盆地芒棒组层序的形成受多期构造活动控制的观点，并建立了3个构造层序，划分了体系域。     

黑龙江孙吴-嘉荫盆地白垩纪孢粉组合及地层划分对比

黑龙江孙吴—嘉荫盆地内两口地质探井获得的135块孢粉样品中含有孢粉化石87属,这些孢粉化石可以划分为4个孢粉组合,根据组合特征,这4个孢粉组合的地质时代分别为早白垩世凡兰吟期—欧特里沃期、阿尔必期,晚白垩世桑顿期—坎潘期、马斯特里赫特期,同时含这些孢粉化石的相关的白垩纪地层可以相应划分为下白垩统宁远村组、淘淇河组、上白垩统太平林场组和富饶组。这一研究为重新认识和建立孙吴—嘉荫盆地的地层层序提供重要的古生物依据。     

济阳坳陷古近纪孢粉与层序地层

在陆相盆地中,基底沉降、沉积物供给和气候控制着基准面变化和层序发育,而气候的变化造成植被的变化,即造成了植被所产生的孢粉组合的变化,层序地层与孢粉组合有着密切的联系。首先根据孢粉母体植物生长的环境来恢复古气候,然后与综合岩性、电性及地震等资料在济阳坳陷古近系划分出的1个一级层序、4个二级层序、10个三级层序相对照。结果表明,利用孢粉组合特征进行层序地层学研究是可行的;牛38井沙三段中连续取芯井段,根据孢粉可以划分出湖侵体系域和湖退体系域2个三级层序,依据主要孢粉属种的变化,进一步划分出17个次级层序,与高精度层序地层对应。在资料丰富的情况下,可以运用孢粉组合变化进行高精度层序地层学分析,以提高区域地层对比的精度。     

哈密坳陷上二叠统──三叠系层序地层学研究

根据地质、地震、测井及地球化学资料对吐哈盆地哈密坳陷上二叠统－三叠系的层序地层学特征进行了研究。把上二叠统－三叠系划分为两个层序，每个层序发育LST，TST和HST等3个体系域。论述了哈密坳陷上三叠统－三叠系的沉积格局及其演化，确定出两套生储盖组合。     

内蒙古海拉尔盆地贝尔凹陷贝32井南屯组地层及孢粉组合

对内蒙古海拉尔盆地贝尔凹陷贝32井南屯地层中的孢粉化石进行了系统研究,自下而上建立了2个孢粉化石组合。Piceaepollenites云杉粉-Pinuspollenites双束松粉-Abietineaepollenites单束松粉组合,分布于南屯组一段;Concentrisporites同心粉-Piceaepollenites云杉粉-Pinuspollenites双束松粉组合,分布于南屯组二段。根据孢粉化石组合中Cicatricosisporites,Densoisporites,Triporoletes,Pilosisporites等重要分子的地质时限特征,认为南屯组地质时代为早白垩世Aptian—Albian。这些孢粉化石资料对建立海拉尔盆地地层层序,而指导盆地油气勘探具有十分重要的理论和现实意义。     

滇西南腾冲地块新构造运动阶段初步划分

滇西南腾冲地块中部的梁河盆地地层出露较好,阶梯状地貌发育,并有多期火山活动,是开展新构造研究的良好地点。综合地表调查与年代学研究结果发现,该盆地主要发育新近纪南林组与芒棒组和第四纪地层,各时代地层的沉积及变形特征都明显不同,其中最早的盆地沉积南林组地层的固结及变形程度高;芒棒组的固结及变形程度则稍差;第四纪地层没有固结或弱固结,且基本无变形。该区在地貌上共发育7级阶(台)地,各级地貌面主要形成于早更新世以来。该区的火山活动至少包括3.5~5.0Ma、2.3~2.9Ma、1.0~1.5Ma及0.5~0.7Ma四期。综合梁河盆地中地层、地貌、火山等方面的新构造运动标志,将腾冲地块的新构造运动初步划分为3个阶段:15Ma之前,盆地开始断陷,南林组沉积及掀斜变形;25~2Ma,盆地进一步扩张,芒棒组沉积及掀斜变形,并伴随火山活动;32Ma以来,盆地萎缩抬升,形成多级台地及阶地,并伴随多期火山活动。     

新疆柴窝堡盆地侏罗纪孢粉地层学

根据孢粉组合特征及其与国内外有关资料的对比、分析,认为三工河组的孢粉组合时代为早侏罗世晚期,西山窑组和头屯河组的孢粉组合时代为中侏罗世。对柴窝堡盆地侏罗系沉积发育特征、各岩组所含孢粉组合面貌及其地质时代作了研究,建立了可信的侏罗系层序：水西沟群包括下统的八道湾组和三工河组、中统下部的西山窑组,艾维尔沟群包括中统的头屯河组和上统的齐古组与喀拉扎组。研究证实,早至中侏罗世早期该盆地气候温湿,植被发育,沉积以河湖相为主,为重要成煤及生油期;中侏罗世晚期至晚侏罗世受燕山运动影响盆地抬升,气候逐步变得干热,沉积以红色粗碎屑河流或山麓河流相为主。     

腾冲—梁河地区的上第三系

云南省怒江以西的地域,本文称之腾冲-梁河地区。区内晚第三纪盆地含铀矿资源,而盆地的地层划分和对比尚存在不少疑议。本文从沉积学、古生物、标志层和同位素年龄等方面综合分析,认为区内各大型盆地发育了上新世早期至晚期的沉积,而小盆地沉降较晚,发育上新世中期至晚期的沉积。龙川江盆地和梁河盆地中的最老的火山岩,其层位分别按近芒棒组和南林组的底部,但同位素年龄值仅7.19±1.11Ma和7.2Ma,明显新于上新世下限年龄值10Ma。因此,区内盆地最早沉积为上新世早期,南林组与芒棒组同期,均为上新世。     

吐哈盆地台北凹陷侏罗系层序地层学研究

本文依据地质、测井、地震及地球化学资料对吐哈盆地台北凹陷侏罗系的层序地层学特征进行了研究。把侏罗系划分为3个三级层序。每个层序发育LsT，TsT和HsT 3个体系域。据测井和岩心资料，将3个层序进一步划分为准层序组和准层序。准层序组和准层序分别有3种类型。通过对体系域演化模式的分析，确定出两套有利的生储盖组合。     

准噶尔盆地克拉美丽地区石炭,二叠纪孢粉组合及地质时代

准噶尔盆地东北缘克拉美丽地区石炭、二叠纪地层的孢粉学研究，仅在早石炭世的塔木岗组、滴水泉组和晚二叠世的平地泉组中发现不很丰富的孢粉化石，可划分为与上述３个组相对应的３个孢粉组合，被依次称为Ｄｉｃｔｙｏｔｒｉｌｅｔｅｓ－Ｌｙｃｏｓｐｏｒａ组合、Ｃｒａｓｓｉｓｐｏｒａ－Ｐｕｎｃｔａｔｉｓｐｏｒｉｔｅｓ－Ｓｔｅｎｏｚｏｎｏｔｒｉｌｅｔｅｓ组合和ｐｉｔｙｏｓｐｏｒｉｔｅｓ－Ｔｏｒｉｓｐｏｒａ组合。经孢粉组合特征讨论及与国内外同期孢粉组合对比，这３个组合或３个组的地质时代可初步确定为早石炭世早期的杜内期、早石炭世晚期早维宪期和晚二叠世中期的中欧克期。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

NONMETALS DEPOSITS

正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.)     

MATHEMATICAL GEOLOGY

正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology,     

PROSPECTING EXPLORATION

正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.)     

STRUCTURAL GEOLOGY

正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se-     

STRUCTURAL GEOLOGY

正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with