Land-sea correlations in the Eastern Mediterranean region over the past c. 800 kyr based on macro- and cryptotephras from ODP Site 964 (Ionian Basin)
Land-sea correlations in the Eastern Mediterranean region over the past c. 800 kyr based on macro- and cryptotephras from ODP Site 964 (Ionian Basin)
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DOI：
10.1016/j.quascirev.2021.106811
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发表时间：
2021-03
影响因子：
4
通讯作者：
P. Vakhrameeva;A. Koutsodendris;S. Wulf;M. Portnyagin;Oona Appelt;T. Ludwig;M. Trieloff;J. Pross
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文献类型：
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作者：
P. Vakhrameeva;A. Koutsodendris;S. Wulf;M. Portnyagin;Oona Appelt;T. Ludwig;M. Trieloff;J. Pross
陆地和海洋气候代用记录之间的直接相关性是必不可少的，以确定潜在的领先/滞后关系的陆地和海洋领域的气候强迫的反应。在东地中海地区，这种陆海相关性尚未建立超过c。20万为了探索晚更新世和中更新世在东地中海地区的海陆相关性火山灰层的潜力，我们重新访问了尚未证实的火山灰层以前报告的大洋钻探计划（ODP）网站964（爱奥尼亚盆地）为过去的c。800 kyr，以确定其来源并检查潜在的陆地对应物。使用主要和微量元素的玻璃分析，我们证实了存在7个可见火山灰层的年龄从623至38万年。这些火山灰层代表了意大利火山中心（Y-5、Y-7、X-6和V-0）已知的火山灰等时线，以及埃特纳（623 ka）、坎帕尼亚火山带（CVZ; 238 ka）和潘泰莱里亚（238 ka）的三次未知喷发。由于ODP站点964的大多数先前报告的火山灰层被确定为非火山成因的碎屑层，因此对跨越海洋同位素阶段（MIS）13至9（500-320 ka）的岩心进行了隐火山灰分析。这项工作产生了19个隐火山岩层，起源于圣托里尼火山，CVZ，可能是Roccamonfina火山，以及在伊奥利亚群岛或南爱琴海火山弧的一个不确定的来源。两个火山灰层与意大利半岛和巴尔干半岛的陆地档案中的潜在等价物相关，包括火山灰等时线SC 5/A7/OH-DP-1966（c. 493 ka; Mercure basin，Acerno basin，and Lake Ohrid）和TP 09 -65.95（c. 359 ka; Tenaghi Philippon），分别代表Roccamonfina的未知喷发和Santorini的Cape Therma 1喷发。海洋记录ODP站点964与陆地记录Tenaghi Philippon，奥赫里德湖，和Acerno盆地通过火山灰结点的直接链接，使我们能够规避个人年龄模型的缺点，并获得一个全面的图片气候变率在更大的东地中海地区的MIS 13-9间隔。
Direct correlations between terrestrial and marine climate-proxy records are essential in order to determine potential lead/lag relationships in the response of the terrestrial and marine realms to climate forcing. In the Eastern Mediterranean region, such land-sea correlations have not yet been established beyond c. 200 ka. To explore the potential of tephra layers for Late and Middle Pleistocene land-sea correlations in the Eastern Mediterranean region, we have revisited yet unconfirmed tephra layers previously reported from Ocean Drilling Program (ODP) Site 964 (Ionian Basin) for the past c. 800 kyr in order to identify their origin and examine potential terrestrial counterparts. Using major- and trace-element glass analyses, we confirmed the presence of seven visible tephra layers with ages from 623 to 38 ka. These tephra layers represent known tephra isochrons from Italian volcanic centers (Y-5, Y-7, X-6, and V-0) and three yet unknown eruptions from Etna (623 ka), the Campanian Volcanic Zone (CVZ; 238 ka), and Pantelleria (238 ka). Because the majority of the previously reported tephra layers from ODP Site 964 were identified as clastic layers of non-volcanic origin, cryptotephra analyses were carried out for cores spanning Marine Isotope Stages (MIS) 13 to 9 (500–320 ka). This effort yielded 19 cryptotephra layers originating from Santorini volcano, the CVZ, possibly Roccamonfina volcano, and an undefined source in either the Aeolian Islands or the South Aegean Volcanic Arc. Two tephra layers are correlated with potential equivalents from terrestrial archives on the Italian and Balkan Peninsulas, including tephra isochrons SC5/A7/OH-DP-1966 (c. 493 ka; Mercure basin, Acerno basin, and Lake Ohrid) and TP09–65.95 (c. 359 ka; Tenaghi Philippon) that represent an unknown eruption of Roccamonfina and the Cape Therma 1 eruption of Santorini, respectively. Direct linking of the marine record from ODP Site 964 with the terrestrial records from Tenaghi Philippon, Lake Ohrid, and the Acerno basin via tephra tie points allowed us to circumvent shortcomings of the individual age models, and to obtain a comprehensive picture of climate variability in the greater Eastern Mediterranean region for the MIS 13–9 interval.