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1.
塔里木盆地北部石炭一二叠纪高分辨率层序年代地层体制 总被引：2，自引：0，他引：2
层序年代地层体制，本质上就是以各种不同级次的海平面变化所控制的不同级次的沉积层序为单位，在年代地层学格架中所建立起来的地层系统。本文以露头剖面的层序地层研究为主要依据，结合生物地层和地震地层的研究成果，在进行详细层序划分的基础上，通过生物地层和层序地层相结合的方法，重新厘定并标定了塔里木盆地北部石炭－二叠系中一系列重要地质界面和层序界面的年龄。首次在该区石炭－二叠纪地层中建立起了由不同周期叠加的海 相似文献
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含煤建造露头层序地层分析—以太原西山石炭二叠系剖面为例 总被引：4，自引：3，他引：4
从太原西山石炭二叠系标准剖面入手，探讨了露头层序地层分析方法，含煤地层格架研究中的应用。太原西山石炭二叠纪沉积建造可分为２个陆表海碳酸盐岩与硅质碎屑岩混合沉积层序和２个河流碎屑岩层沉积层序，其形成受控于３级海平面变化。 相似文献
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济源西部石炭二叠系层序地层学特征 总被引：3，自引：1，他引：2
根据野外露头观测,结合勘探阶段的资料,对河南省济源西部石炭二叠系层序地层学特征进行了系统研究,探讨了聚煤作用的控制因素,首次发现河南省境域内石炭纪的河流与三角洲沉积,并指出中条山可能是石炭二叠纪重要的物源区。该区层序地层学研究对河南省石炭二叠纪古地理再造具有重要意义。 相似文献
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贵州台地相区宗地剖面晚石炭世一早二叠世早期层序地层特征 总被引：3，自引：0，他引：3
应用露头层序地层学基本原理和方法，在详细的岩石岩相学、沉积学研究和精细的地层划分对比基础上，对贵州宗地剖面晚石炭世二叠纪早期地层进行了露头层序地层研究。研究表明，贵州宗地剖面晚石炭世一二叠纪早期地层至少可识别出6种主要岩相及11种具有不同环境意义的微相类型。宗地剖面晚石炭世地层可以划分出6个三级层序，二叠纪早期地层可划分出4个三级层序。笔者等阐述了沉积层序的各种界面的露头标志，探讨了三级层序和层序区域对比的基本特征。三级沉积层序在不同古地理单元和不同沉积环境中可以进行对比。三级层序发育TST和HST，LST不发育或难以识别。 相似文献
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依据华北地台晚古生代陆表海沉积建造层序界面的识别标志,在红阳煤田石炭—二叠系残余地层中识别出了6个层序界面,并据此建立了由DS1-DS55个三级层序构成的层序地层格架,揭示了红阳煤田石炭—二叠纪沉积环境由海相到陆相演化的过程。DS1-DS5层序地层岩性岩相分析表明:DS2、DS3层序是石炭—二叠纪主要聚煤期。DS2层序发育堡岛体系,岛后泥炭坪与滨岸沼泽相沉积在区内形成了厚度较大且连续性较好的12、13煤;DS3层序发育三角洲体系,泛滥盆地与分流间湾相沉积发育了多层不可采或局部可采煤层。与DS3层序海陆过渡相沉积成煤相比,DS2层序海相沉积煤层的灰分与硫分相对较高,且在区域上都呈现由北向南逐渐升高的趋势,这与海水退出红阳煤田的方向相吻合,表明红阳煤田石炭—二叠纪聚煤期古地理格局对煤层发育及煤质特征具有明显的控制作用。 相似文献
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华东地区二叠纪地层甚为发育,分布广泛,生物化石丰富,研究程度较高,不仅生物地层研究颇详,同时近几年来在沉积学及岩相古地理方面也做过较多工作,这些均为层序地层研究和划分创造了有利条件。前几年,我们在安徽、江苏、福建、江西、浙江等地实测和详细观察了23条剖面(图1),在详细研究地层、沉积学、沉积相的基础上,试图对研究区二叠纪层序地层作一探讨。一、二叠纪层序地层划分本区二叠纪沉积盆地介于华夏古陆与鲁东古陆之间,为一克拉通盆地,比较稳定。盆地内发育北东向坳陷与隆起以及同沉积断裂。栖霞期和吴家坪期甚为稳定,岩性岩相单一,厚度变化不大。在茅口期和长兴期,盆地发生分异,坳陷与 相似文献
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华北晚古生代含煤盆地层序地层初探 总被引：11，自引：1，他引：11
根据内陆表海盆地特征，运用层序地层分析的原理，对华北石炭二叠纪含煤地层进行了层序地层单元划分，建立了层序地层格架，并进行了沉积体系分析。海平面相对升降变化是控制层序单元形成的主要因素。含煤沉积形成过程中的海侵方向及其变化都有一定的规律。受盆地周缘构造的影响，盆地的沉积演化可分为５个阶段。聚煤作用往往出现在层序地层单元形成的后期；空间上，富煤带多位于海侵体系域的上倾方向。随时间的推移，由北而南富煤带向上部层位迁移。 相似文献
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内蒙古西部北山-银额地区石炭纪-二叠纪层序地层与沉积演化 总被引：2，自引：1，他引：1
内蒙古西部北山-银额地区位于华北板块、塔里木板块和哈萨克斯坦板块的交汇带,构造背景复杂,一直是构造研究的热点地区。虽然研究区发育数千米以碎屑岩+火山岩+碳酸盐岩为特征的石炭系-二叠系,但层序地层与沉积演化研究十分薄弱,一定程度上制约了对构造背景的认识。本文通过石炭纪-二叠纪区域地层对比与层序地层研究,分别建立了北山和银额2个地区石炭纪-二叠纪层序地层格架,明确了不同构造单元石炭纪-二叠纪层序地层具有良好的对比关系,为统一构造环境沉积的地质体。通过沉积演化研究,明确了研究区石炭纪-二叠纪具有"两坳一隆"的构造格架,并控制着沉积相的展布,早石炭世晚期北山地区南部接受沉积,之后逐渐伸展,晚石炭世晚期-早二叠世早期盆地沉积范围最大,盆地演化达到鼎盛。早二叠世晚期盆地开始萎缩,晚二叠世海水基本退出研究区,仅银额东北部接受了海相沉积。总之,层序地层及沉积演化研究指示研究区石炭纪-二叠纪为相同构造环境下形成的统一的陆内(板内)裂谷盆地。 相似文献
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黔桂地区石炭系层序地层格架及海平面变化 总被引：8，自引：1，他引：7
从石炭系到下二叠统,构成一个二级层序,其底面为紫云运动主幕不整合面及其相关面,顶界面为黔桂运动不整合面及其相关面,包含6个三级层序。研究区范围内,从连陆台地到孤立台地乃至台沟背景,沉积特征明显不同,如在连陆台地上发育煤系地层并且发育较多的白云岩地层,而在孤立台地上则以大套碳酸盐岩地层为特征,台沟背景中以暗色细粒沉积为主包括台盆相和台棚相沉积。因此,三级沉积层序的相序特征形成有规律的空间变化,虽然在不同的地点三级层序的形成时限和相序组构存在差异,但它们所代表的相对海平面变化过程基本上是同步的。在前人大量的古生物学研究成果的基础上,追索各三级沉积层序界面的空间展布特征,以地层记录中的两种相变面和两种穿时性为基本要素,可以建立黔桂地区石炭系(含下二叠统)的地层层序格架。 相似文献
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通过对保山地块北部西邑地区下石炭统香山组和下二叠统丁家寨组详细的野外剖面实测与钻孔编录,并结合层序地层学、沉积相以及碳氧同位素分析结果认为,下石炭统香山组自下向上可分为三个岩性段,分别对应台前斜坡下部、台前斜坡上部、碳酸盐岩台地三种沉积环境。下二叠统丁家寨组为滨岸冰水沉积,下部为冰碛含砾钙质杂砂岩,发育落石构造。下石炭统香山组δ13CPDB值自下而上逐渐升高,环境可能较稳定,有机质埋藏增加。综合前人古地磁、生物区系对比、大地构造学等研究成果认为早石炭世保山地块较稳定,仍属冈瓦纳大陆北缘。丁家寨组冰碛含砾钙质杂砂岩结束后δ13CPDB值出现强烈负偏,与研究区冰期结束、早二叠世初次温度上升、大量玄武岩喷发等时限高度一致,共同说明了保山地块在早二叠世开始从冈瓦纳大陆北缘裂解出来,并开始向北漂移。该项研究的开展为探讨Submasu地块晚古生代的古海洋、古地理和气候演化具有重要意义,为全球同时期碳氧同位素数据库提供了新资料。 相似文献
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Mei Mingxiang Ma Yongsheng Deng Jun Meng Qingfen Li Donghai 《中国地质大学学报(英文版)》2005,16(3):231-249
INTRODUCTION Alotofprogresshasbeenmadeinthestudyof Carboniferoussedimentologyandstratigraphyinthe Dianqianguibasinanditsadjacentareas,whichin cludethecomprehensivesummariesonchronostratigraphyandbiostratigraphybyJinetal.(2000)and Kuangetal.(1999);theoverallandsystematicsum mariesonCarboniferouslithostratigraphybyDong(1997),Yin(1997)andZhao(1996);thecompre hensivestudyonCarboniferoussedimentaryfacies andpaleogeographybyChenetal.(1994)andFeng etal.(1998)etc..AsshowninFig.1,theDian qiang… 相似文献
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贵阳乌当上古生界的海侵—海退层序 总被引：1，自引：1，他引：1
在位于上扬子古陆边缘的贵阳乌当泥盆纪至石炭纪剖面上, 泥盆系包括蟒山群碎屑岩和高坡场组白云岩, 其中可以识别出 5个三级层序; 石炭系至二叠系船山统包括祥摆组、旧司组、上司组、摆佐组、黄龙组、马平组和梁山组,其中祥摆组和梁山组为含煤碎屑岩系地层, 其余各组为碳酸盐岩地层, 可以划分出 5个三级层序。与贵州南部至广西一带较为完整的泥盆系和石炭系相对比(泥盆系包含 13个三级层序,石炭系至二叠系船山统包含 6个三级层序 ), 贵阳乌当剖面以较薄的地层厚度和较多的三级层序的缺失为特征, 成为间断大于沉积的典型地层代表, 这是由于古陆边缘海退作用的沉积响应大于海侵作用所致。石炭纪与二叠纪过渡时期的大幅度慢速海侵作用改变了这种局面, 同邻区一样研究区域也进入了大片海域发育的时期, 所以阳新统和乐平统的层序大致与贵州南部至广西一带相近, 这是由于与相应的三级海平面上升相关的大幅度慢速海侵作用的结果。 相似文献
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本文通过对华北板块沉积层序的研究，认为晚古生代沉积建造形成于一个二级海平面变化周期内，其中包括４个三级海平面变化旋回，分别发育于晚石炭世早期早时，晚石炭世早期晚时至晚石炭世晚期，早二在世和中二在早期至晚二叠世早期。每个三级海平面变化周期内又包含了若干个四级升降旋回。海平面变化具有全球性和等时住，本区的二级和三级海平面变化可与俄罗斯地台和北美地台等对比。 相似文献
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宁夏北部沙巴台地区太原组沉积层序及其年代地层对比 总被引：1，自引：1，他引：0
宁夏北部沙巴台地区的太原组为海陆交互相和三角洲相沉积 ,可划分为 2个三级层序、 4个副层序组和 1 8个副层序。与华南海相沉积层序的对比表明太原组属晚石炭世 Gzhelian晚期至早二叠世 Artinskian中期。下二叠统 Asselian阶的底界 (即 C/P界线 )大体与太原组下部层序的初始海泛面一致 ,可广泛对比。 相似文献
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Late Palaeozoic glaciation in Australia, discovered over a century ago, is now known to have covered a large part of the continent. In South Australia, tillite and outwash debris lie upon clearly striated pavements within glacial valleys, and show that ice sheets with valley tongues moved northward from sources now occupied by deep ocean south of the continent. These glaciers reached into the Cooper, Arckaringa, and Pedirka Basins at the end of the Carboniferous and laid down patches of till in the Early Permian, now preserved largely in the subsurface. In Tasmania, an ice sheet waxed in the latest Carboniferous from sources to the west of the island, and deposited till and “drop‐stones” into fossiliferous marine strata until well into the Late Permian. In Victoria, the ice cap laid down till on a striated floor, and here and there sequences of outwash, including boulder pavements. In New South Wales, continental glaciation expanded eastward to the sea early in the Permian, and left a record intercalated with volcanics and coal beds into the Late Permian. Bordering the Tamworth Trough of northern New South Wales, and occurring also in the highlands of New England, alpine glaciers left a record in the form of striated stones and dropstones, in very thick sequences of fluviatile, lacustrine, and marine clastic sediments. The mountains existed in Middle and early Late Carboniferous times, and were largely worn down to gentle relief when continental glaciers expanded northward in the Early Permian. A non‐glacial interval at the end of the Carboniferous therefore probably occurred in New South Wales. In Queensland, alpine glaciers occupied mountains at the western rim of the Bowen Basin at the end of the Carboniferous. Large blocks carried by icebergs from glaciers of unknown locations were dropped into Lower and Upper Permian strata of the Bowen Basin as well. In Western Australia Early Permian ice centres were located on the Yilgarn Block, east of the Perth Basin, on the Pilbara Block southwest of the Canning Basin, and on the Kimberley Block. Evidence for this glaciation consists mostly of ice‐rafted debris and fluvial‐glacial and glacial‐marine strata that reached as far north as the Bonaparte Gulf Basin. The rapid growth northward of continental glaciers in Australia near the end of the Carboniferous corresponds with a rapid shift of palaeolatitude as judged from Irving's palaeomagnetic studies. The ice sheet grew quickly upon upland areas when Gondwanaland moved to a near polar position and the unfrozen Palaeo‐Pacific lay near at hand to provide an abundant source of moisture. 相似文献
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Paulo Marcos Daniel A.Gregori Leonardo Benedini Mercedes Barros Leonardo Strazzere Cecilia Pavon Pivetta 《地学前缘(英文版)》2018,9(2):485-504
The metasedimentary sequence of the Cushamen Formation in the western North Patagonian Massif is540 m thick and comprises six sedimentary lithofacies associations related to a glacimarine environment.Four of these lithofacies represent distal glacimarine environments, whereas another one was deposited in proximal glacimarine environments, and the last includes subglacial environments. The organization and configuration of these lithofacies associations represent the advance and retreat of the glacier masses. The maximum glacial advance is correlatable with the G2 glacial interval of the Pennsylvanian Pampa de Tepuel, Las Salinas and Valley Chico, formations of the Extraandean Chubut, and the southern part of Neuquen Cordillera. Contemporaneously, in southern Chile there are marine and glacimarine sediments. The chronostratigraphic relationships between the Silurian to Permian units allow five paleogeographic stages to be distinguished. The middle Silurian-late Devonian igneous rocks represent the first magmatic stage. The second stage, which is transitional to the first, is represented by a marine basin that includes the late Devonian-early Carboniferous Esquel and Rio Pescado formations and the Llanquihue Complex. The third stage(early-late Carboniferous) includes granitoids of the second magmatic event that partially overlapped the first magmatic igneous belt. The fourth stage belongs to the late Carboniferous sedimentation of the Cushamen and equivalent formations. The extended early Permian magmatism was the last Paleozoic event in the studied area. 相似文献
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In this paper we discuss the timing of final closure of the Paleo-Asian Ocean based on the field investigations of the Carboniferous–Permian stratigraphic sequences and sedimentary environments in southeastern Inner Mongolia combined with the geology of its neighboring areas. Studies show that during the Carboniferous–Permian in the eastern segment of the Tianshan-Hinggan Orogenic System, there was a giant ENE–NE-trending littoral-neritic to continental sedimentary basin, starting in the west from Ejinqi eastwards through southeastern Inner Mongolia into Jilin and Heilongjiang. The distribution of the Lower Carboniferous in the vast area is sparse. The Late Carboniferous or Permian volcanic-sedimentary rocks always unconformably overlie the Devonian or older units. The Upper Carboniferous–Middle Permian is dominated by littoral-neritic deposits and the Upper Permian, by continental deposits. The Late Carboniferous–Permian has no trace of subduction-collision orogeny, implying the basin gradually disappeared by shrinking and shallowing. In addition, it is of interest to note that the Ondor Sum and Hegenshan ophiolitic mélanges were formed in the pre-Late Silurian and pre-Late Devonian respectively, and the Solonker ophiolitic mélange formed in the pre-Late Carboniferous. All the evidence indicates that the eastern segment of the Paleo-Asian Ocean had closed before the Late Carboniferous, and most likely before the latest Devonian (Famennian). 相似文献