南黄海西部“阿尼努德振动”现象的初步研究   总被引：1，自引：0，他引：1  

于洪军  严理 《海洋科学》1994,18(5):62-67

通过对南黄海的大量浅地层部面仪资料的判读,发现在低于现代海面６０ｍ附近的地层中有２条古海岩线,从而证明了中国陆架上也曾发生过阿尼努德振动。这项发现对于进一步研究晚更新世末斯的陆架环境具有重要的意义。  相似文献   

福建沿海晚更新世以来的海平面变化   总被引：4，自引：0，他引：4  

王绍鸿  杨建明 《台湾海峡》1994,13(2):166-175

本文选择了六类７９个具有＾１４Ｃ年龄和准确高程的古海面标志物，按北，中，南三个岸段分别建立了三条相对海平面变化曲线，讨论了福建沿海晚更新世以来的海平面变化特征和规律，通过比较也分析了不同岸段新构造差异升降情况。  相似文献   

Pleistocene glacial history of the NW European continental margin   总被引：3，自引：3，他引：3  

Hans Petter Sejrup  Berit Oline Hjelstuen  K.I. Torbjrn Dahlgren  Haflidi Haflidason  Antoon Kuijpers  Atle Nygrd  Daniel Praeg  Martyn S. Stoker  Tore O. Vorren 《Marine and Petroleum Geology》2005,22(9-10):1111

In this paper new and previously published data on the Pleistocene glacial impact on the NW European margin from Ireland to Svalbard (between c. 48°N–80°N) are compiled. The morphology of the glaciated part of the European margin strongly reflects repeated occurrence of fast-moving ice streams, creating numerous glacial troughs/channels that are separated by shallow bank areas. End-moraines have been identified at several locations on the shelf, suggesting shelf-edge glaciation along the major part of the margin during the Last Glacial Maximum. Deposition of stacked units of glacigenic debris flows on the continental slope form fans at a number of locations from 55°N and northwards, whereas the margin to the south of this is characterised by the presence of submarine canyons. Glaciation curves, based primarily on information from the glacial fed fan systems, that depict the Pleistocene trends in extent of glaciations along the margin have been compiled. These curves suggest that extensive shelf glaciations started around Svalbard at 1.6–1.3 Ma, while repeated periods of shelf-edge glaciations on the UK margin started with MIS 12 (c. 0.45 Ma). The available evidence for MIS 2 suggest that shelf-edge glaciation for the whole margin was reached between c. 28 and 22 ¹⁴C ka BP and maximum positions after this were more limited in some regions (North Sea and Lofoten). The last glacial advance on the margin has been dated to 15–13.5 ¹⁴C ka BP, and by c. 13 ¹⁴C ka BP the shelf areas were completely deglaciated. The Younger Dryas (Loch Lomond) advance reached the coastal areas in only a few regions.  相似文献   

从古海平面遗迹看晚更新世中国海的高海面高度     

刘尚仁 《热带海洋学报》1997,(3)

从渤海到南海分布的几十至上百米宽的海蚀平台、与全新世类高的晚更新世海积地面和同期滨海相粘性土的顶面高程，是确定晚更新世、尤其是距今4万至2万年中国海的高海面接近现在海面的3项古海面遗迹证据。选择证据以大陆海岸、岩岸和沙坝湖海岸为主。三角洲平原的晚更新世中期海相粘性土的顶面高程偏低，是由于沉积物压实、冰期低海山时被流水蚀低和构造下沉3个因素造成的，可通过复原获得改正。  相似文献   

浙江金塘水道南部更新世侵蚀顶面及其意义     

刘阿成 《海洋学研究》1993,11(4):23-29

浅地层剖面的初步研究表明,金塘水道南部更新世古侵蚀顶面的深度在海面下约25～70m。研究区东、西部之间的差异较大。在西部该顶面向海倾斜,发育近岸浅冲沟、斜坡和陡坎;东部发育大冲沟,侵蚀面起伏大。现代海底一般受到顶面形态的影响,研究区中部海底的显著变浅,正是该面上凸所致。  相似文献   

新发现的周口店晚更新世洞穴地层及哺乳动物群研究     

田明中  曹伯勋  袁铃声  赵志中  陈莲芳  涂丽娟 《海洋地质与第四纪地质》1994,(1)

本文依据新发现的晚更新世洞穴地层剖面，进行了年代学及哺乳动物化石方面的研究。年代学综合测定结果为距今１２～１．９万年，这是周口店地区迄今发现的最为完整的晚更新世洞穴地层剖面，根据堆积物中所含的哺乳动物化石特征，进行了生态、种类方面的研究，建立了一个新的哺乳动物群─—东岭子动物群。  相似文献   

舟山群岛峡道底部高程及其冲刷对浙闽沿海泥沙供给的影响   总被引：6，自引：0，他引：6  

蒋国俊  陈吉余 《海洋地质与第四纪地质》1997,17(2):29-38

根据舟山群岛峡道地区的钻孔资料，在有孔虫、花粉和沉积特性分析结果的基础上，分析了晚更新世海面变化，探讨了晚更新世末期峡道内的地面高程，进而根据海图量算结果，讨论了舟山群岛峡道底部的泥沙冲淤及其对浙闽沿海泥沙供给的影响。本文认为，晚更新世以来舟山群岛地区发生了三次海进海退，其中晚更新世末期低海面时，舟山群岛峡道高程约位于吴淞基面以下３８ｍ左右，全新世海侵以来，受峡道水动力的作用，除部分峡道内海湾发生淤积外，舟山群岛峡道底部发生了明显的冲刷，其最大冲刷厚度可达８０ｍ左右，为杭州湾乃至整个浙闽沿海提供了大量的泥沙  相似文献   

中更新世以来东海陆架的古环境   总被引：12，自引：4，他引：12  

刘振夏  S Berne  L′ATALANTE科学考察组 《海洋地质与第四纪地质》1999,19(2):1-10

基于１９９６年中法合作在东海陆架进行的电火花单道地震调查资料,并与位于东海外陆架钻孔ＤＺＱ４对比,发现对应于氧同位素６期以来的六个地震地层与钻孔地层呈现很好的对应关系,其间共有四次海退－海进的沉积旋回。资料分析表明东海第四纪环境演变与全球气候冷暖变化所导致的海面升降直接相关。  相似文献   

Sea-level related resedimentation processes on the northern slope of Little Bahama Bank (Middle Pleistocene to Holocene)     

HENDRIK LANTZSCH  SVEN ROTH†  JOHN J. G. REIJMER†  HANNO KINKEL‡ 《Sedimentology》2007,54(6):1307-1322

Middle Pleistocene to Holocene sediment variations observed in a 26 metre long core taken during a cruise of the RV Marion Dufresne are presented. Core MD992202 was retrieved from the northern slope of Little Bahama Bank and provides an excellent example for sedimentation processes in a mid‐slope depositional environment. The sediment composition indicates sea‐level related deposition processes for the past 375 000 years (marine isotope stages 1 to 11). The sediments consist of: (i) periplatform ooze (fine‐grained particles of shallow‐water and pelagic origin) with moderate variations in carbonate content, carbonate mineralogy and grain‐size; and (ii) coarser intervals with cemented debris consisting of massive, poorly sorted, mud‐supported or clast‐supported deposits with an increased high‐magnesium calcite content. During interglacial stages (marine isotope stages 1, 5, 7, 9 and 11) periplatform oozes (i) are characterized by higher aragonite contents, finer grain‐size and higher organic contents, whereas during glacial stages (marine isotope stages 2 to 4, 6, 8 and 10), increased low‐magnesium and high‐magnesium calcite values, coarser grain‐size and lower organic contents are recorded. These glacial to interglacial differences in mineralogy, grain‐size distribution and organic content clearly show the impact of climatically controlled sea‐level fluctuations on the sedimentation patterns of the northern slope of Little Bahama Bank. The coarser deposits (ii) occur mainly at the transitions from glacial to interglacial and interglacial to glacial stages, and are interpreted as redeposition events, indicating a direct link between sediment properties (changes in mineralogy, grain‐size distribution, variations in organic contents) and sea‐level fluctuations. Changes in hydrostatic pressure and the wave base position during sea‐level changes are proposed to have triggered these large‐scale sediment redepositions.  相似文献   

西藏阿里札达盆地上新世—早更新世河湖相地层年代学研究   总被引：1，自引：0，他引：1       下载免费PDF全文

朱大岗孟宪刚  邵兆刚杨朝斌 王 津 韩建恩 余 佳孟庆伟  吕荣平 《中国地质》2007,34(6):983-992

通过对西藏阿里札达盆地河湖相地层实测剖面中的古地磁、ESR样品的测试分析,确定了札达盆地新近纪上新世—第四纪早更新世沉积地层的时间序列。测试结果表明:从剖面自下而上所做的古地磁测年数据为5.41～1.60Ma;而ESR测年数据为5.4～1.36Ma,两者大体吻合。根据古地磁、ESR测年结果,可将该套河湖相地层的时序划分为:上新世托林组(N21t)的形成时间为5.41～4.20Ma、上新世古格组(N22g)为4.20～2.57Ma、早更新世香孜组(Qp1-1x)为2.57～1.36Ma。为青藏高原新近纪上新世—第四纪早更新世地层时间序列标尺的建立,以及上新世、早更新世河湖相地层的划分与对比提供了重要依据。  相似文献