浙江雁荡山地区晚中生代火山-沉积岩系地层归属讨论   总被引：1，自引：0，他引：1  

王孔忠  朱朝晖  俞云文 《浙江国土资源》2001,17(1):6-18

浙江雁荡山地区晚中生代火山-沉积岩系的地层归属,存在磨石山群和永康群两种截然不同的认识.本文在详细分析对比了该区与浙东南磨石山群和永康群的地层层序、岩相组合、接触关系,古生物组合,同位素地质年龄,Nd同位素体系特征以及火山构造类型等方面的资料,认为除原划为永康群盆地外,仅桥下地区有面积不大的永康群,其余均为早白垩世早期的磨石山群,而不是早白恶世晚期至晚白垩世早期的永康群.特别是在永嘉枫林村北,首次发现并证实了不整合覆于震旦系浅变质岩之上的大爽组地层,为浙东南沿海晚中生界火山-沉积岩系的划分对比提供了坚实的基础.  相似文献   

塔河地区S112-2井区志留系油藏主控因素分析及重要意义     

彭真  贺凯  李健伟  杨勇 《新疆地质》2011,29(4):448-452

志留系柯坪塔格组柯三段是塔北地区重要含油层段,通过对S112-2井区油藏解剖,明确该区志留系油藏主控因素,即早期油藏破坏与晚期成藏并存、构造-地层削蚀不整合控藏.研究表明,地层削蚀不整合对油气疏导、次生孔隙形成具重要作用.进一步明确塔河南地区志留系勘探方向和思路,各层段尖灭线位置是核心,构造精细解释落实圈闭是勘探成功关...  相似文献   

闽西下白垩统坂头组锆石U-Pb年龄及地层对比     

胡广  胡文碹  曹剑  姚素平  王学寅  刘友祥 《地球科学进展》2011,26(9):933-943

通过闽西地区永安盆地与崇安盆地下白垩统坂头组凝灰岩夹层中的岩浆锆石定年研究以及古生物研究,首次获得2个盆地坂头组底部开始沉积的准确年龄,分别为（144±2）和（116±2）Ma。根据它们与上覆地层关系来看,2个盆地坂头组顶部年龄基本等时约为100 Ma。因此,崇安盆地坂头组仅相当于永安盆地吉山剖面上段。在与临区地层对比...  相似文献   

山东青州地区炒米店组上部牙形石组合及寒武、奥陶系界线的确定     

张宏达  刘海坤  刘书才 《山东国土资源》2000,(4)

通过对明祖山剖面的岩石地层、年代地层、生物地层的综合研究及区域地层对比 ,得出以下结论 :①明祖山剖面可划分为五个牙形石带 ,寒武—奥陶系界线位于Cordylodusproavus带与Utahconusbeimadaoensis Monocostodussevierensis带之间 ;②通过区域地层对比 ,寒武—奥陶系分界在青州地区已位于炒米店组之内部 ,而且整个两河口阶全部位于炒米店组上部  相似文献   

Tectonic evolution of the ‘Liguride’ accretionary wedge in the Cilento area,southern Italy: A record of early Apennine geodynamics     

S. Vitale  S. Ciarcia  S. Mazzoli  M.N. Zaghloul 《Journal of Geodynamics》2011

The early stages of southern Apennine development have been unraveled by integrating the available stratigraphic record provided by synorogenic strata (of both foredeep and wedge-top basin environments) with new structural data on the Liguride accretionary wedge cropping out in the Cilento area, southern Italy. Our results indicate that the final oceanic subduction stages and early deformation of the distal part of the Apulian continental margin were controlled by dominant NW–SE shortening. Early Miocene subduction-accretion, subsequent wedge emplacement on top of the Apulian continental margin and onset of footwall imbrication involving detached Apulian continental margin carbonate successions were followed by extensional deformation of the previously ‘obducted’ accretionary wedge. Wedge thinning also enhanced the development of accommodation space, filled by the dominantly siliciclastic Cilento Group deposits. The accretionary wedge units and the unconformably overlying wedge-top basin sediments experienced renewed NW–SE shortening immediately following the deposition of the Cilento Group (reaching the early Tortonian), confirming that the preceding wedge thinning represented an episode of synorogenic extension occurring within the general framework of NW–SE convergence. The documented Early to the Late Miocene steps of southern Apennine development are clearly distinct with respect to the subsequent (late Tortonian-Quaternary) stages of fold and thrust belt evolution coeval with Tyrrhenian back-arc extension, which were characterized by NE-directed thrusting in the southern Apennines.  相似文献   

Drowning discontinuities and stratigraphic correlation in platform carbonates. The late Barremian–early Aptian record of southeast France     

Jean-Pierre Masse  Mukerrem Fenerci-Masse 《Cretaceous Research》2011,32(6):659-684

In Provence and Languedoc, four drowning events were identified in platform carbonates of late Barremian–Bedoulian age. Their recognition is based on sedimentological and stratigraphical evidence, and their timing, referred to ammonite zones or subzones, is as follows:

• (1) 

  Late Barremian, at the G. sartousiana–Imerites giraudi transition, or merely the lowermost part of the I. giraudi zone,

• (2) 

  Middle Bedoulian, at the Deshayesitesweissi–Deshayesites deshayesi transition,

• (3) 

  Mid late Bedoulian in correspondence with the “Roloboceras hambrovi subzone”,

• (4) 

  Late Bedoulian at the Deshayesites grandis–Deshayesites furcata transition.

Corresponding events are also well expressed in basinal settings where they are marked by significant facies and faunal changes.These four successive drowning events distinguish four successive steps in platform development and demise. Step 1 was coeval with the onset of the Bedoulian palaeogeography and started after drowning event (1) with a drastic reduction of shallow platform settings with rudists, usually replaced by Palorbitolina facies. The ensuing recovery of rudist facies and, following drowning event (2), subsequent step 2 marked the developmental phase of the platform system, whereas steps 3 and 4, each prefaced by a drowning event, were associated with its demise. Step 1 represents the major spreading phase of the Urgonian type facies spectrum including bioclastics, coral and rudist facies groups. In Provence, step 1 was characterized by a bipolar (N-S) progradation, and aggradation was coeval with a maximum of subsidence. The termination of step 1 was marked by the emergence of the antecedent platform margin. Step 2, which followed the disappearance of rudist facies and the extreme spatial reduction of both coral and bioclastic facies, started with the flooding of the antecedent platform and the development of Palorbitolina and cherty limestones. Shallow water bioclastics and/or coral facies recovered rapidly on top of the pre-existing emerged areas and developed locally as bioclastic shoals. Step 2 documents a regional reorganisation of subsidence patterns.The infralittoral (high illuminated environments) “Urgonian facies” are therefore essentially present in the Lower Bedoulian, and circalittoral (relatively deep low illuminated environments) deposits dominate in the Upper Bedoulian. This pattern, typical for SE France and wide parts of the Helvetic shelf, departs from that of adjacent regions (e.g. SW France, Spain) where late Bedoulian platform carbonates have a significant record. The record thus shows that the demise of the Urgonian platform was a step-wise phenomenon which cannot be ascribed to a single event, i.e. the Goguel/Selli OAE1a main event.  相似文献   

Using Virtual Palaeontology to Investigate Trace Fossil–Body Fossil Associations in Molluscs from the Mesozoic of Madagascar     

Imran A. RAHMAN  LIN Jih-Pai 《《地质学报》英文版》2013,87(Z1):864-866

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A Fossil Assemblage of Sponge Spicules from the Lower Kaili Formation (Cambrian Series 2), South China     

MAO Yingyan  LI Xiangfeng  LIN Jih-Pai  Lucy A. MUIR  Joseph P. BOTTING 《《地质学报》英文版》2013,87(Z1):883-885

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西准噶尔包古图-哈图地区“太勒古拉组”使用商榷     

向坤鹏  李永军  徐磊  张宏伟  佟丽莉 《新疆地质》2013,(3)

新疆西准噶尔包古图-哈图地区石炭系广泛出露。近年来1∶5万区域地质调查证实,前人在包古图地区建立和命名的下石炭统“太勒古拉组”层型由早石炭世包古图组细碎屑岩和晚泥盆世克拉玛依蛇绿构造混杂岩带两部分组成。本文主要讨论“太勒古拉组”在西准噶尔地区的使用和相关商榷。  相似文献   

西藏改则地区昂拉仁错中—下二叠统昂杰组—下拉组地层古生物     

周羽漩  赵兵  严亮  李杨 《地球科学与环境学报》2014,(4)

详细描述了西藏自治区改则县拉清乡汤模长二叠系剖面,自下而上划分为拉嘎组、昂杰组和下拉组。讨论了二叠系昂杰组和下拉组的岩性组合特征和沉积环境,其中昂杰组横向延伸不稳定向西相变尖灭。依据化石分布及组合特征,建立了Neoschwagerina-Chusenella conicocylindrica蜓组合带、Pachyphloia ovata-Eotuberitina reitlingerae非蜓有孔虫组合带、Lytvolasma asymetricum-Bradyphyllum caninoidia珊瑚组合带和Akagophyllum coqenense-Amplexocarinia muralis珊瑚组合带。昂杰组为早二叠世,下拉组下部为中二叠世栖霞期,而下拉组上部为中二叠世茅口期,并以暖水型气候环境为主。在昂杰组—下拉组中发现了珊瑚的2个新种和1个新亚种,并进行了描述。新种名称分别为Lophotabularia longiseptata sp.nov.和Iranophyllum longiseptatum sp.nov.,新亚种名称为Cyathocarinia tuberculata multiseptata sub sp.nov.。  相似文献