Mass Wasting History Within Lake Ohrid Basin (Albania/Macedonia) Over the Last 600 ka

Mass Wasting History Within Lake Ohrid Basin (Albania/Macedonia) Over the Last 600 ka
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奥赫里德湖盆地(阿尔巴尼亚/马其顿)过去 600 年来的大规模浪费历史

DOI:
10.1007/978-3-319-20979-1_29
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Baumgarten
Baumgarten
中科院分区:
--
文献类型:
--
作者:
Lindhorst;Krastel;Baumgarten

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奥赫里德湖 (LO) 是巴尔干半岛上马其顿和阿尔巴尼亚共有的跨界湖泊,不仅被认为是欧洲最古老的湖泊 (~2 Ma),而且拥有悠久而连续的沉积历史。 LO 的一个优势是可以获得覆盖整个湖盆的高质量水声数据集。构造形成的盆地充满了厚厚的未受干扰的沉积物。然而,LO 的整体内部结构以大量断层、斜形结构和多个质量传输沉积物 (MTD) 为特征。通过使用将地震反射器包与海洋同位素阶段 (MIS) 相关联的地震年代学模型 (SCM),我们估计了在 MIS9 到 MIS8(~300ka)过渡时在南部盆地检测到的最深 MTD 的出现情况,定义了至今仍在进行的 LO 滑动历史的开始。一般来说,MTD 在盆地内广泛分布,但它们确实聚集在活动断层上。两次大型 MTD 发生在 MIS7 早期(~230ka,~220ka),在大约 70ka 的静止期之后,在倒数第二个冰河期 MIS6 晚期(~150ka,130ka)又检测到了另外两个大型 MTD。 MIS5 似乎是关于大规模消瘦的另一个安静时期。在较年轻的沉积历史中,大规模运动是一个常见的过程,在所有地层层面都绘制了多个大型和中型矿床。最年轻的滑坡沉积物估计出现在过去 2,000 年内。本文的主要成果是奥赫里德湖大规模浪费的时空分布模型。
Lake Ohrid (LO), a transboundary lake shared by Macedonia and Albania on the Balkan Peninsula, is not only considered to be the oldest lake in Europe (~2 Ma) but has a long and continuous sedimentary history. An advantage at LO is the availability of hydroacoustic data sets of good quality covering the entire lake basin. The tectonically formed basin is filled with thick undisturbed sediments. However, the overall internal structure of LO is characterized by numerous faults, clinoform structures, and several Mass Transport Deposits (MTDs). By using a seismic chronology model (SCM) correlating seismic reflector packages with Marine Isotope Stages (MIS) we estimate the occurrence of the deepest MTD detected in the southern basin at the transition of MIS9 to MIS8 (~300 ka) defining the onset of the sliding history in LO that is still ongoing today. In general, MTDs are widespread within the basin but they do cluster at active faults. Two large MTDs occurred in the early MIS7 (~230 ka, ~220 ka) and after a quiesence period of about ~70 ka two additional large MTDs have been detected in the late penultimate glacial period MIS6 (~150 ka, 130 ka). MIS5 seemed to be another quiet period with respect to mass wasting. In the younger sedimentary history mass movement is a common process with several large and mid-sized deposits mapped at all stratigraphic levels. The youngest slide deposits are estimated to occur within the last 2,000 years. The main outcome of this paper is a model for the spatial and temporal distribution of mass wasting for Lake Ohrid.
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