东海大陆架南缘海域地层声学剖面及地质解释

阐述了对东海陆架南缘勘查区进行的高分辨率的浅地层探测情况。通过对测区的浅地层声学剖面的解释和研究,笔者认为:声学剖面较直观地反映了该区的海底地形、地貌、浅地层沉积物结构、构造及海底基岩埋深状况,对恢复该区沉积地质环境和发育历史有重要意义。     

安徽庐江黄屯铜金矿床原生晕特征及矿床成因

通过对安徽庐江黄屯铜金矿床18号勘探线上的4个钻孔岩心进行系统取样和分析,研究了18号勘探线剖面地质特征及原生晕分带特征,探讨了该矿床的地球化学异常模式及矿床成因。黄屯铜金矿床的特征元素组合为Au、Ag、Cu、As、Sb、Bi、W,原生晕垂向分带序列为（Sb、As）-（Ag、Au、Cu）-（Bi、W）。18号勘探线剖面地质特征和原生晕形态特征显示,在ZK18-1钻孔和ZK18-2钻孔之间可能存在隐伏断层,造成铜金矿体和地层错动。在TK02钻孔底部发育热液矿床前缘晕元素组合异常,指示深部可能存在隐伏矿体。综合研究认为,黄屯铜金矿床的成矿物质可能主要来源于火山热液和闪长玢岩,该矿床为火山-次火山热液型矿床。     

南海北部浅地层剖面数据精细处理方法

通过对南海北部海域浅层剖面资料的分析研究,解决了多个数据处理难点。针对SEGY数据中的坐标错误,提出从导航定位原始资料中获取相应位置数据,改写SEGY道头信息,解决了SEGY数据道头坐标错误的问题;对波形进行相应处理,提高了浅地层剖面资料的分辨率;针对浅地层剖面震源位置不准的问题,对震源位置进行了校正;对同一设计测线多次分段作业剖面进行了剖面连接等。旨在为浅地层剖面的后续综合地质解译提供理想的基础资料。     

浅地层剖面仪在长江口航道探测中的应用

一、概况为了保障长江口的水运畅通和改善长江口入海航道,对长江口航道作了地质普查。浅地层剖面仪探测为其中一种手段。1979年和1980年先后使用从日本进口的SP-2型和SP-3型浅地层剖面仪及我国研制的QPY-1型浅地层剖面仪进行了长江口航道施测。本文从航道地     

川东华蓥二叠系一三叠系界线地层地质事件与元素地球化学响应

以华蓥山涧水沟PTB界线地层剖面为例,对地层学界长期争论但始终没有得到解决的全球性地质难题PTB界线进行了地质、地球化学等方面的探讨,可从该剖面中识别出生物地层和岩性地层两类T/P界线,两者相距约4.56m,所有的海平面下降、生物绝灭、火山喷发和古海洋由正常海向非正常的高Sr海转化等复杂地质事件,都发生在两类T/P界线...     

渤海湾某海洋平台场址浅层气分布与成因

海底浅层气严重影响海底地层的结构稳定性,因此成为影响近海海洋平台安全的重要因素.基于高精度浅地层剖面及单道地震等物探调查资料,识别了渤海湾某海洋平台周边的浅层气分布状况及顶界埋深,并分析了研究区浅层气的成因.浅地层和单道地震资料解释的浅层气分布和顶界埋深具有非常好的一致性,平台周边1 km2范围内的浅层气主要分布在平台...     

闽北近岸海域晚更新世以来沉积地层特征及其演化

根据2015年青岛海洋地质研究所地质调查船在闽北近岸海域采集的3 500 km高分辨率的浅层地震剖面资料,结合所处海域水深35~40 m、长度90.2 m、穿过测线Z3和测线L9地震剖面的交叉处的一口地质岩芯ECS1601的分析,对闽北近岸海域晚更新世以来的沉积地层进行了精细的划分。研究结果表明:闽北近岸海域浅层地震剖面,可以识别出5个地震层序,自上而下分别为SU1(QT0-QT1)、SU2(QT1-QT2)、SU3(QT2-QT3)、SU4(QT3-QT4)、SU5(QT4-QT5);根据沉积特征和测年数据,地质岩芯ECS1601可以划为4个沉积地层单元,从上往下依次命名为DU1、DU3、DU4、DU5(DU5a、DU5b、DU5c)。将两者进行对比发现,SU1对应于DU1,SU3对应于DU3,SU4对应于DU4,SU5对应于DU5。综合分析地震剖面和地质浅钻,建立了闽北近岸海域的年代地层框架和沉积地层演化模式,探讨了研究区的沉积演化过程。     

吉林中部地区石炭系下统余富屯岩组地层序列及沉积特征

对吉中地区石炭系下统余富屯岩组进行了描述和分析,展示了该套地层的沉积学特征,确定了研究区展布的余富屯岩组为浅海相沉积环境,同时伴有火山喷发活动。通过同位素测年手段,揭示了该套地层取样点位处的火山岩形成年龄,从而确定了余富屯岩组的地质年代。     

基于浅地层剖面仪的鄱阳湖水下沉积地形探测与分析

鄱阳湖是我国重要的淡水和砂石资源提供地,其水下沉积地形现状一直是学术界研究的重点。该文借助浅地层剖面探测手段对鄱阳湖水下地形与沉积特征进行了探测,通过分析32条浅地层剖面测线资料发现,鄱阳湖水深变化幅度为0.16～23.71 m,入江水道与主湖区西北部相对较深;松散沉积物厚度变化范围为0～8.73 m,主湖区中部松散沉积物较厚,估算松散沉积物总体积约3.02 km³。为检验浅地层剖面探测数据的可靠性,2022年9月在主湖区开展了浅钻探测工作。通过与前人的相关研究对比发现,大规模采砂活动能够对鄱阳湖水下地形产生显著影响。该文较全面地揭示了鄱阳湖水下地形现状与沉积特征,得出的结论与建议对相关研究与管理工作具有重要的参考价值。     

新疆伊宁盆地尼勒克地区二叠纪地层研究新进展

尼勒克地区二叠纪地层分布面积最广，地层出露齐全，接触关系清楚，包括5个组的全部层型剖面在内，是在西天山研究二叠纪地层的经典地区．通过对5条层型剖面全部进行重测，系统采集样品，取得了成果．主要体现在火山喷发旋回研究、生物化石及岩相分析研究，并进行较详细的地层划分，为西天山二叠纪地层划分与对比提供了可靠依据．     

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.     

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).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861