Sub-marine Continuation of Peat Deposits From a Coastal Peatland in the Southern Baltic Sea and its Holocene Development
Sub-marine Continuation of Peat Deposits From a Coastal Peatland in the Southern Baltic Sea and its Holocene Development
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波罗的海南部沿海泥炭地泥炭矿床的海底延续及其全新世发育
DOI：
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发表时间：
2018
影响因子：
2.9
通讯作者：
P. Feldens
中科院分区：
文献类型：
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作者：
M. Kreuzburg;M. Ibenthal;M. Janssen;G. Rehder;M. Voss;M. Naumann;P. Feldens
波罗的海南部沿海低洼地区为沿海泥炭地的形成提供了良好的条件。在全新世，利托里纳海的海侵造成了海岸洪水泛滥，淹没和侵蚀了古老的海岸线和以前的陆地物质。根据陆上和近海沉积岩心和地质声学调查，目前的海利根塞和哈特尔穆尔泥炭地(位于德国北部罗斯托克附近)在海岸线前面持续了90多米。泥炭地的临海面积估计为0.16-0.2平方公里。以前的泥炭地的近海界限与一个动态的海岸平行的沿岸沙洲的近海界限大致重合，泥炭沉积侵蚀了海区。虽然在更远的近海一个小型沙脊系统下方发现了额外的富含有机质的层，但根据14C年龄和C/N比，无法建立与以前的泥炭地的联系。海里根塞和哈特尔穆尔海岸泥炭地前保存的有机碳含量为37%的水下泥炭矿床的放射性碳测年分别为6725+/-87年和7024+/-73calyr BP，表明泥炭地的形成时间比目前公布的要早。泥炭层的形成时间提供了当地海平面上升的信息。从我们的14C测年富有机层得到的当地海平面曲线与附近的海平面重建(北鲁根和费施兰，德国北部)总体上是一致的，差异是由局部均衡运动解释的。
Coastal low-lying areas along the southern Baltic Sea provide good conditions for coastal peatland formation. During the Holocene, the transgression of the Littorina Sea has caused coastal flooding, submergence and erosion of ancient coastlines and former terrestrial material. The present Heiligensee & Hutelmoor peatland (located near Rostock in Northern Germany) was found to continue more than 90 m in front of the coastline based on on- and offshore sediment cores and geo-acoustic surveys. The seaward areal extent of the peatland is estimated with 0.16-0.2km2. The offshore limit of the former peatland roughly coincides with the offshore limit of a dynamic coast-parallel longshore bar, with peat deposits eroded seawards. While additional organic-rich layers were found further offshore below a small sand ridge system, no connection to the former peatlands can be established based on 14C age and C/N ratios. The preserved submerged peat deposits with organic carbon contents of 37 % in front of the coastal peatland Heiligensee & Hutelmoor was radiocarbon-dated to 6725 +/- 87 and 7024 +/-73 cal yr BP, respectively, indicating an earlier onset of the peatland as presently published. The formation time of the peat layers gives information about the local sea level rise. The local sea level curve derived from our 14C-dated organic-rich layers is in general agreement to nearby sea level reconstructions (North Rugen and Fischland, Northern Germany), with differences explained by local isostatic movements.