Sedimentary evolution of Lake Van (Eastern Turkey) reconstructed from high-resolution seismic investigations
Sedimentary evolution of Lake Van (Eastern Turkey) reconstructed from high-resolution seismic investigations
复制标题
根据高分辨率地震调查重建凡湖（土耳其东部）的沉积演化
DOI：
10.1007/s00531-012-0816-x
复制
发表时间：
2012
影响因子：
2.3
通讯作者：
Niessen
中科院分区：
文献类型：
--
作者：
Krastel;Demirel-Schlüter;Demirbag;Niessen
本文介绍了货车湖多道地震反射勘探的结果，并提供了湖泊沉积演化的制约因素。湖的地球物理数据证实存在三个地文省：一个陆棚，一个斜坡，和一个深，相对平坦的盆地。在陆架和斜坡上发现的最突出的特征是斜坡、水下通道以及间隔紧密的湖底凹陷，反映了高度可变的湖面历史。形态凹陷被解释为造成水下侵蚀的渠道化，沉积物负载电流成水平层状扇沉积物。东部大陆架上的淹没通道被解释为曲流斜坡通道，可能是由于暴露了大陆架区域的湖平面下降的结果。东部扇上的斜坡可能代表在静止或略上升的湖平面间隔期间形成的残余三角洲。将地下成像解释与暴露沉积物的形态学研究相结合，揭示了过去约550 ka期间数百米的湖平面波动。该湖有三个突出的盆地（塔特万，Deveboynu和北方盆地）由基底脊分开（例如，北方山脊）。塔特万和北方盆地的地震单元主要由良好分层和混沌反射的交替组成，而Deveboynu盆地地下主要由混沌单元组成。混乱的地震相被解释为质量流沉积，可能由地震和/或快速的湖平面波动触发。在盆地的较深部分看到的中高振幅、分层良好的相被解释为湖相沉积物，其中夹有火山灰层。在湖的最深处的一个斜坡的发生表明一个主要的洪水阶段的货车湖超过~400 ka前。湖盆最深处的地震剖面显示出非常均匀和连续的地层单元，在洪水事件之后没有任何主要的侵蚀特征，这表明湖泊在洪水之后从未完全干涸，因此比以前提出的要古老得多。
This paper presents results of a multi-channel seismic reflection survey at Lake Van and provides constraints on the sedimentary evolution of the lake. The geophysical data of the lake confirm the existence of three physiographic provinces: a shelf, a slope, and a deep, relatively flat basin. The most prominent features identified on the shelf and slope are clinoforms, submerged channels, as well as closely spaced lake floor depressions, reflecting a highly variable lake-level history. The morphological depressions are interpreted as resulting from subaquatic erosion by channelized, sediment-laden currents into horizontally bedded fan sediments. Submerged channels on the eastern shelf are interpreted as meandering-slope channels, probably as a consequence of a lake-level fall that exposed the shelf area. Clinoforms on the Eastern fan may represent relict deltas formed during stationary or slightly rising lake-level intervals. Merging subsurface imaging interpretation with morphological studies of exposed sediments reveals lake-level fluctuations of several hundreds of meters during the past ca. ~550 ka. The lake has three prominent basins (Tatvan, Deveboynu, and the Northern basin) separated by basement ridges (e.g., the Northern ridge). The seismic units in the Tatvan and Northern basins are dominated by alternations of well-stratified and chaotic reflections, while the Deveboynu basin subsurface consists mainly of chaotic units. The chaotic seismic facies are interpreted as mass-flow deposits, probably triggered by earthquakes and/or rapid lake-level fluctuations. The moderate-to-high-amplitude, well-stratified facies seen in the deeper parts of the basins are interpreted as lacustrine deposits intercalated with tephra layers. The occurrence of a clinoform in the deepest part of the lake suggests a major flooding stage of Lake Van more than ~400 ka ago. Seismic profiles from the deepest part of the lake basin show remarkably uniform and continuous stratigraphic units without any major erosional feature following the flooding event, indicating that the lake was never completely dry afterward and therefore significantly older than previously suggested.
登录
查看更多内容
火山混合雪崩：雪覆盖火山上独特的喷发引发的质量流过程
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
T. C. Pierson;R. Janda
通讯作者：
R. Janda
“重建欧亚大陆中部过去气候的进展，特别是贝加尔湖”简介
影响因子：
3.9
作者：
H. Oberhänsli;A. Mackay
通讯作者：
A. Mackay
2000年11月15日土耳其东部凡湖地震M_w=5.6震源机制及其地震构造意义
DOI：
--
发表时间：
2007
期刊：
Geophysical Journal International 170
影响因子：
--
作者：
Pinar;A.;Y. Honkura;K. Kuge;M. Matsushima;N. Sezgin;M. Ylmazer;and Z. Ogutcu
通讯作者：
and Z. Ogutcu
深冰川湖冰川至间冰期充填物的高分辨率地震地层学：法国阿尔卑斯山西北部勒布尔热湖
DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
P. V. Rensbergen;M. Batist;C. Beck;E. Chapron
通讯作者：
E. Chapron
在安纳托利亚东部钻探了 50 万年的沉积物档案
DOI：
10.1029/2011eo510002
发表时间：
2011
期刊：
Eos, Transactions American Geophysical Union
影响因子：
--
作者：
Anselmetti;Cagatay;Kipfer;Krastel;Schmincke;Sturm M.
通讯作者：
Sturm M.