A new deglacial climate and sea-level record from 20 to 8 ka from IODP381 site M0080, Alkyonides Gulf, eastern Mediterranean
A new deglacial climate and sea-level record from 20 to 8 ka from IODP381 site M0080, Alkyonides Gulf, eastern Mediterranean
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DOI：
10.1016/j.quascirev.2023.108192
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发表时间：
2023-08
影响因子：
4
通讯作者：
I. Mazzini;T. Cronin;R. Gawthorpe;R. E. Ll Collier;Gino de Gelder;A. Golub;M. Toomey;R. Poirier;Huai-Hsuan May Huang;M. P. Phillips;L. McNeill;D. Shillington
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作者：
I. Mazzini;T. Cronin;R. Gawthorpe;R. E. Ll Collier;Gino de Gelder;A. Golub;M. Toomey;R. Poirier;Huai-Hsuan May Huang;M. P. Phillips;L. McNeill;D. Shillington
最近一次冰川消融的相对海平面上升记录大多限于珊瑚礁记录和地球物理模型估计，但来自温带气候地区的观测数据很少。我们基于国际海洋发现计划(IODP)M0080站点M0080上部8米的介形虫古生态，提出了冰川终止1(海洋同位素阶段[MIS]2-1)的新的相对气候和区域海平面上升记录。该站点位于地中海东部科林斯盆地的阿尔乔尼德湾。结果表明，20~8ka之间发生了从湖相(庞托-里海、科林斯湖)冰期组合到完全海相(地中海)间冰期组合的一系列主要动物群过渡。在冰期和早期去冰期，阿尔康尼德湾以非海洋湖泊条件为特征，有来自沿海盐湖环境的断续沉积物输入。相对稳定的湖岸线条件，以独特的结核杆菌为标志。存在于∼17.5ka至15ka之间。在Bülling-alleräd(B-A，∼15-13.5ka)高峰期，海平面的快速上升表现为完全海洋介形虫动物群的定居，持续时间为13.5~7.5ka(晚更新世-早至中全新世)。从湖泊环境向海洋环境的转变证实了在最后一次冰盛期低海平面(低于现今130m-125m)，科林斯-阿尔约尼德沉积中心为湖泊。海水冲破了浅水的里昂和阿切鲁斯-帕帕斯角的岩床，这些岩床今天深达50-60米，从大约15ka开始分隔地中海和科林斯-阿尔乔尼德系统。根据烷基化合物沉积速率，科林斯-烷基尼德系统B-A洪水期间的平均海平面上升速率与珊瑚礁海平面(SL)记录的平均海平面上升速率相当，至少为10-20亿毫米/年−1。该构造活动区的沉积和基床深度的变化可能在地中海和科林斯/烷基尼德系统长期重新连接中发挥了作用。然而，动物群变化的年龄和规模，以及它们与先前发表的全球海平面曲线和ICE-7G模式预测的基于退冰期陆地海拔变化的区域海平面曲线的明显对应，表明M0080A退冰期以冰川-海平面上升为主，并记录了终止期1期间全球气候变化的细节。
Records of relative sea-level rise for the last deglaciation are mostly limited to coral reef records and geophysical model estimates, but observational data from regions with temperate climates is sparse. We present a new relative climatic and regional sea-level rise record for glacial Termination 1 (Marine Isotope Stages [MIS] 2–1) based on ostracode paleoecology from the upper 8 m of the International Ocean Discovery Program (IODP) Site M0080 collected on Expedition 381, in the Gulf of Alkyonides, eastern Corinth basin of the Mediterranean Sea. Results show a series of major faunal transitions from lacustrine (Ponto-Caspian, Lake Corinth) glacial-age assemblages to fully marine (Mediterranean) interglacial assemblages between 20 and 8 ka. During glacial and early deglacial intervals, the Gulf of Alkyonides was characterized by non-marine lacustrine conditions with episodic sediment input from coastal, saline lake environments. Relatively stable lake shoreline conditions marked by the distinctiveTuberoloxoconchasp. Existed from ∼17.5 to 15 ka. During the peak deglacial interval, the BØlling-AllerØd (B-A, ∼15–13.5 ka), rapid sea-level rise is indicated by a fully marine ostracode fauna colonization, which persisted from 13.5 to 7.5 ka (Late Pleistocene-Early to Middle Holocene).The transition from lacustrine to marine environments confirms that during the last glacial maximum (LGM) low sea level (130 - 125 m below present day), the Corinth-Alkyonides depocentres were lacustrine. Marine water breached the shallow Rion and Acheloos-Cape Pappas sills, which today are ∼50–60 m deep, separating the Mediterranean and Corinth-Alkyonides system beginning about 15 ka. Based on Alkyonides sedimentation rates, mean rates of sea-level rise during the B-A flooding of the Corinth-Alkyonides system are comparable to those obtained from coral reef sea level (SL) records, at least 10–20 mm yr−1. Changes in sedimentation and sill depths in this tectonically active region may have played a role in reconnection of the Mediterranean and Corinth/Alkyonides system over a prolonged period. However, the ages and scale of the faunal changes and their clear correspondence with previously published global sea-level curves and the regional sea-level curve based on deglacial land elevation changes predicted by the ICE-7G model suggests the M0080A deglacial is dominated by the glacio-eustatic sea-level rise and records details of global climate changes during Termination 1.