湖南永州蚣坝、水市地区泥盆纪岩相古地理演化特征探讨     

陈端赋何周虎  黎传标 《湖南地质》2002,21(3):175-181

蚣坝、水市地区位于华南褶皱系南岭构造带中段北缘，泥盆纪地层广布测区，南部其昌岭基底隆起导致区内古地理环境的巨大变迁，岩石组合复杂，岩相类型多样，致使区内不同时期、同一时期不同区域的岩相演化特征有着不同的特点。  相似文献   

道县地区泥盆纪岩石地层格架及层序地层浅析     

刘富国彭学军  邓瑞林 《湖南地质》2002,21(4):265-270

道县地区泥盆纪地层存在不同的３个沉积相区，各相区岩石组合特征具明显差异，在该区1∶25万区调工作的基础上，总结了泥盆纪地层的沉积相变规律，建立了岩石地层格架，划分出７个岩石层序，并对层序地层进行了浅析。  相似文献   

论塔里木盆地“东河砂岩”的地质时代   总被引：15，自引：2，他引：15  

朱怀诚  罗辉  王启飞  张师本  赵治信  黄智斌 《地层学杂志》2002,26(3):197-201

系统总结了关于近年来塔里木盆地重要储油层——“东河砂岩”年代研究所取得的主要进展 ,包括 1)“东河砂岩”中发现晚泥盆世孢子和胴甲鱼化石 ;　 2 )含砾砂岩段发现晚泥盆世盾皮鱼化石 ;　 3)下泥岩段下部发现晚泥盆世孢子 ;　 4 )下泥岩段上部和生屑灰岩段分别发现石炭纪初期第一、二孢子组合带 ;　 5 )生屑灰岩段发现石炭纪初期的牙形刺 ;　 6 )化学 -生物地层学研究结果指示 ,泥盆系 -石炭系界线应在“东河砂岩”顶面之上。据此 ,“东河砂岩”的时代应为泥盆纪。  相似文献   

湘西南中、上泥盆统礁特征及其找矿意义   总被引：3，自引：0，他引：3  

杨开济 《地球科学》1986,(1)

作者提出了一个较完善的生物礁定义。在湘西南洞口—城步确定了十个生物礁;列举了典型礁相剖面并阐述了礁体特征;提出六种生物礁成矿作用。环礁内的城步铺头黄铁矿床成因类型,属于礁控半闭塞泻湖沉积矿床。后来（1979—1980）鉴于这类矿床的独特成矿作用和巨大经济价值,提出礁控成矿论、礁控矿床和生物数学地质等概念来指导找矿。  相似文献   

Prediction of oil or gas pool sizes when discovery record is available   总被引：8，自引：0，他引：8  

P. J. Lee  P. C. C. Wang 《Mathematical Geology》1985,17(2):95-113

The Upper Devonian Bashaw reef play of the Western Canada Basin was used to demonstrate: (1) estimation of pool size distribution by means of a discovery model, (2) the usefulness of a feedback mechanism in petroleum resources evaluations, and (3) enhancement of reliability by reducing uncertainty associated with estimates. The feedback mechanism presented herein allows us to challenge geological interpretations. For example, given the second largest pool size, the largest pool size can be estimated, and vice versa. In evaluations of petroleum resources, the uncertainty inherited from superpopulations is inevitably associated with the estimates. This type of uncertainty can be reduced to a certain extent if additional information is included in the estimation procedures and, consequently, the reliability of the estimates is enhanced. The additional information used may, for example, be the geological interpretation of a particular play. To achieve maximum effectiveness, resource evaluation methods should possess these types of flexibility. This study also estimated, with a 90% probability, that the remaining potential in the Bashaw reef play ranges from 32 to 50 millions of cubic meters (200 to 300 MM bbl) of oil in place.  相似文献   

东秦岭泥盆纪成矿海盆中一种（准）同生热水蚀变岩研究   总被引：1，自引：0，他引：1  

薛春纪  马国良 《矿物岩石》1993,13(1):25-32

赋存层控铅锌矿床的东秦岭泥盆系内发育一类特殊岩石——方柱黑云岩。野外和室内的研究表明,它是与火山及热泉活动有关的异常地热海盆中的一种特殊沉积相。矿物学、岩石学及地球化学特征也为其原凝灰质沉积岩经过热卤水“浸泡效应”(soaking effect)形成方柱黑云岩类的成因提供了可靠信息。据此推测秦岭泥盆纪层控矿床成矿海盆的异常地热背景和热水沉积环境。  相似文献   

甘肃北山北部双沟山地区发现泥盆系雀儿山群地层   总被引：2，自引：0，他引：2  

张国英 《地层学杂志》2008,32(1):51-54

在《红宝石幅》区域地质调查过程中,发现在甘肃北山双沟山地区分布着一套灰绿色中性、中酸性火山熔岩及其凝灰岩地层,通过岩石地层、生物化石及地层年代等方面的研究,经区域地层对比划归雀儿山群,形成时代确定为早泥盆世。该群的确定对恢复哈萨克斯坦板块南缘区域地质演化历史有重要意义。  相似文献   

东昆仑早泥盆世碰撞造山的侵入岩证据   总被引：15，自引：0，他引：15  

赵振明  马华东  王秉璋  拜永山  李荣社  计文化 《地质论评》2008,54(1):47-56

东昆仑昆中断裂带及其附近茶德尔塔格西、阿尔格山北、塔鹤托坂日、喀雅克登塔格地区的早泥盆世侵入岩,受昆中断裂长期活动影响,岩石变形强烈,岩体在平面上呈不规则透镜状,沿昆中断裂近东西向分布。岩石地球化学特征属于亚碱性、高钾和低钾钙碱系列,介于偏铝质和过铝质之间;在R1—R2岩石类型分类图中位于闪长岩、英云闪长岩、花岗闪长岩、二长花岗岩区;在微量元素标准化图中,具有Rb、Th、Ba富集,高强场元素Nb、Ta明显亏损的特点;在稀土元素球粒陨石标准化图中,LREE富集,HREE亏损,曲线表现出明显的较为平滑的斜率相似的一组曲线,均属强烈右倾负斜率轻稀土富集型,整体分配模式具有火山弧花岗岩的特征。通过构造环境的综合判断,本文研究的东昆仑早泥盆世侵入岩属于后碰撞造山花岗岩,物质来源,壳幔相互作用的产物,从而确立了加里东晚期东昆仑碰撞造山的构造过程。  相似文献   

Palynological characterization of Givetian-Frasnian deposits in the reference Borehole section 1-Balneologicheskaya (Southern Timan)     

O. P. Tel’nova 《Stratigraphy and Geological Correlation》2008,16(2):143-161

A succession of seven palynological assemblages characterizing the Yuzhnyi Timan, Taman, Ust-Yarega, Domanik, and Vetlosyan formations of the southern Timan is established in the Givetian-Frasnian deposits recovered by Borehole 1-Balneologicheskaya and studied in detail. Five individual zones, which are distinguished within stratigraphic range of the optivus-krestovnicovii miospore zone, can be of basic importance for a high-resolution stratigraphic subdivision of the sedimentation stage under consideration. Phytostratigraphic boundary corresponding to the Frasnian Stage base in the East European platform is substantiated in palynological aspect.  相似文献   

Interplay of eustatic,tectonic and autogenic controls on a Late Devonian carbonate platform,northern Canning Basin,Australia     

Ian J. Ferguson  Anne‐Christine Da Silva  Nancy Chow  Annette D. George 《Basin Research》2021,33(1):312-341

Frasnian reef complexes along the northern margin of the Canning Basin in northwestern Australia evolved during rifting of the Fitzroy Trough. Geological investigations of the Frasnian Hull platform, which developed on an active tilted fault‐block, reveal significant lateral and vertical facies variations superimposed on prominent metre‐scale cyclicity. This study uses numerical analyses of facies and magnetic susceptibility data from three measured sections along the Hull platform to test whether a tectonic signal can be distinguished from eustatic and other signals. Geostatistical analysis of facies variations reveals an exponential distribution of thin (<3 m) facies, characteristic of stochastic depositional processes. Thick subtidal facies predominate in the Guppy Hills (GH) and southeastern Hull Range (SHR) sections near the hangingwall margin, and thick shallow‐subtidal to intertidal facies dominate the Horse Springs drillcore (HD 14) section near the footwall margin. Power and wavelet spectral analyses indicate a strong periodic component; Average Spectral Misfit and spectral optimisation methods confirm the presence of Milankovitch eccentricity signals and suggest the presence of obliquity and precession signals. However, the results also expose strong temporal and spatial variation providing evidence for tectonic control. Spectral analyses show strongest periodicity is recorded in short intervals that are not correlated across the platform and provide evidence of variations in sedimentation rate and hiatuses. Time series for the neighbouring GH and SHR sections show no overall statistical correlation, and Markov analysis indicates weakly ordered vertical facies transitions that do not correlate across the platform. Subtidal to intertidal facies data from HD 14 core suggest that at least 35% of the section is absent, almost obscuring the Milankovitch signal. The results indicate a complex set of controls on deposition on the Hull platform with local tectonic effects having produced spatio‐temporal moderation of the underlying eustatic signals and autogenic processes adding a localised stochastic response.  相似文献