Palaeoenvironments in the southern Baltic Sea Basin during Marine Isotope Stage 3 : a multi-proxy reconstruction
Palaeoenvironments in the southern Baltic Sea Basin during Marine Isotope Stage 3 : a multi-proxy reconstruction
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海洋同位素阶段 3 期间波罗的海盆地南部的古环境：多代理重建
DOI：
10.1016/j.quascirev.2011.12.009
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发表时间：
2012
影响因子：
4
通讯作者：
P. Möller
中科院分区：
文献类型：
--
作者：
J. Anjar;L. Adrielsson;O. Bennike;S. Björck;H. Filipsson;J. Groeneveld;K. Knudsen;N. K. Larsen;P. Möller
波罗的海西南部Kriegers Flak的沉积物岩心为研究波罗的海盆地的中Weichselian历史提供了独特的可能性。三个Weichselian间阶单元已被确定，并归因于海洋同位素阶段3（MIS 3，60-25 ka）。最古老的单元A的特点是冰川消退序列，逐渐变成咸水粘土。低多样性底栖有孔虫动物群、稳定氧同位素值和Mg/Ca比值表明A单元的温度和盐度较低。A单元与上覆单元B之间存在一个间隙，B单元沉积于42 - 36 cal. ka BP之间的湿地和浅水湖泊中。宏体化石和花粉分析表明沉积单元B在一个地区占主导地位的树木少开放苔原环境，可能与一些桦树和松树在庇护的位置。最上面的单元C以粘土沉积为特征，包括较老沉积物（单元B）物质的再沉积。光释光（OSL）年龄表明，C单元沉积在26和28.5 ka之间。放射性碳年龄为39和40 cal。装置C的ka BP被认为太旧。提出了以下沉积模式：（1）斯堪的纳维亚冰盖（SIS）推进后的均衡沉降，最有可能的是Ristinge冰推进，以前可追溯到c。55-50 ka，在A单元沉积期间，使海洋沃茨流入波罗的海盆地。(II)均衡反弹造成克里格高射炮的后退，以及A和B单元之间的间隙。(III)在42 ~ 36 cal. ka BP（单元B）之间，隆起区形成了湿地和较小的湖泊。(IV)Kriegers Flak冰川湖相粘土的沉积表明，不断增长的SIS坝卡特加特和波罗的海盆地c。28.5到26 ka。Kriegers Flak的新证据为未来在环波罗的海地区进行MIS 3古环境重建提供了坚实的框架。
Sediment cores from Kriegers Flak in the southwestern Baltic Sea provide a unique possibility to study the Middle Weichselian history of the Baltic Basin. Three Weichselian interstadial units have been identified and are attributed to Marine Isotope Stage 3 (MIS 3, 60–25 ka). The oldest unit A is characterized by a deglaciation sequence, gradually turning into brackish-water clay. The low-diversity benthic foraminiferal fauna, stable oxygen isotope values and Mg/Ca ratios indicate low temperature and salinity for unit A. A hiatus separates unit A from the overlying unit B, which was deposited in wetlands and shallow lakes between 42 and 36 cal. ka BP. Macrofossil and pollen analyses indicate deposition of unit B in an area dominated by a tree-less open tundra environment, possibly with some birch and pine in sheltered positions. The uppermost unit C is characterized by clay deposition, including redeposition of material from older sediments (unit B). Optically stimulated luminescence (OSL) ages indicate deposition of unit C between 26 and 28.5 ka. Radiocarbon ages of 39 and 40 cal. ka BP for unit C are considered to be too old. The following depositional model is suggested: (I) Isostatic depression of the region after an advance of the Scandinavian Ice Sheet (SIS), most likely the Ristinge ice advance, previously dated to c. 55–50 ka, enabled an inflow of marine waters into the Baltic Basin during the deposition of unit A. (II) Isostatic rebound caused a regression at Kriegers Flak, and a hiatus between units A and B. (III) Wetlands and smaller lakes formed in the uplifted area between 42 and 36 cal. ka BP (unit B). (IV) Deposition of glaciolacustrine clays at Kriegers Flak demonstrates that a growing SIS dammed Kattegat and the Baltic Basin c. 28.5 to 26 ka. The new evidence from Kriegers Flak provides a solid framework for future MIS 3 palaeoenvironmental reconstructions in the circum-Baltic area.
影响因子：
5.3
作者：
Hoogakker, Babette A. A.;Klinkhammer, Gary P.;Hayward, Chris
通讯作者：
Hayward, Chris