Evidence of extensive carbonate mounds and sublacustrine channels in shallow waters of Lake Van, eastern Turkey, based on high-resolution chirp subbottom profiler and multibeam echosounder data
Evidence of extensive carbonate mounds and sublacustrine channels in shallow waters of Lake Van, eastern Turkey, based on high-resolution chirp subbottom profiler and multibeam echosounder data
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基于高分辨率线性调频海底剖面仪和多波束回声测深仪数据，土耳其东部凡湖浅水区存在大量碳酸盐丘和湖底水道的证据
DOI：
10.1007/s00367-015-0410-x
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发表时间：
2015
影响因子：
2.1
通讯作者：
Meydan
中科院分区：
文献类型：
--
作者：
Krastel;Çağatay;Meydan
在土耳其东部的凡湖，世界第四大苏打湖，2004年和2012年获得的高分辨率海底剖面和水深数据显示，在北部湖泊部分历史城镇Adilcevaz附近的浅水(<；130米)有数百个地形丘陵。这些构造的特点是顶部反射强烈，内部透明，宽10-300米，高0.5-20米。与之前的工作一致，它们被解释为碳酸盐丘，由富含二氧化碳的地下水排放到高碱性湖泊中的降水形成。它们的年龄仍有待确定，但它们沿断层的排列表明它们的生长受到构造控制。在与岸上河流相连的湖东陆架上观察到了几个湖下水道网络。这些水道宽达500米，深达20米，很可能是在早期文献报道的14ka的大湖水位下降期间由河流作用形成的。在堤防两侧的渠道墙上，侵蚀是常见的。这些通道目前处于非活动状态或被废弃。在水深100m时，它们都汇合成一条较大的水道；该水道在130m水深处有一条起先向西南，然后向西北方向的蜿蜒航道。东部湖架上也可以看到许多紧密分布的小河道(约10-200m宽，1-10m深)，解释为在~14ka湖面下降时形成的树枝状和平行的水道系统。测深数据提供了证据，证明在湖的北部盆地的西坡上有许多湖下峡谷，很可能是在这个低水位期间形成的残留河流的遗迹。
In Lake Van of eastern Turkey, the fourth largest soda lake in the world, high-resolution subbottom profiles and bathymetric data acquired in 2004 and 2012 revealed several hundreds of topographic mounds in shallow waters (<130 m) off the historical town of Adilcevaz in the northern lake sector. These structures are characterized by strong top reflections of transparent internal character, and are 10–300 m wide and 0.5–20 m high. Consistent with previous work, they are interpreted as carbonate mounds formed by precipitation from CO2-rich groundwater discharge into the highly alkaline lake. Their age remains to be determined but their alignment along faults suggests tectonic control on their growth. Several sublacustrine channel networks were observed on the eastern shelf of the lake, which connects with onshore rivers. The channels are up to 500 m wide and 20 m deep, and plausibly were formed by fluvial processes during the major lake level drop reported to have occurred by 14 ka in earlier publications. Erosion is common on the channel walls flanked by levees. The channels are presently inactive or abandoned. At a water depth of 100 m, they all merge into a single larger channel; this channel has a sinuous course initially trending southwestward and then northwestward at a water depth of 130 m. Numerous closely spaced small channels (~10–200 m wide, 1–10 m deep) are also seen on the eastern lacustrine shelf, interpreted as denditric and parallel channel systems formed during lake level fall terminating at ~14 ka. Bathymetric data provide evidence of numerous sublacustrine canyons on the western slope of the lake’s northern basin, most likely remnants of relict rivers formed during this lowstand.
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影响因子：
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作者：
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DOI：
10.1029/2011eo510002
发表时间：
2011
期刊：
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影响因子：
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DOI：
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发表时间：
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