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MoccAMeBo - Climate-driven initiation and development of cold-water coral mounds along the Moroccan Atlantic margin revealed by MeBo-cores

MoccAMeBo - MeBo 核心揭示了摩洛哥大西洋边缘气候驱动的冷水珊瑚丘的形成和发展

基本信息

批准号：
268746146
负责人：
Professor Dr. Dierk Hebbeln
金额：
--
依托单位：
Zentrum für Marine Umweltwissenschaften (MARUM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/268746146?language=en
关键词：
MoccAMeBo Climate driven initiation development

项目摘要

Scleractinian cold-water corals (CWC) are capable of forming substantial 3-dimensional seafloor structures, so-called coral mounds. These mounds are composed of CWC fragments and hemipelagic sediments, which deposited over thousands to millions of years. Along the Moroccan Atlantic margin, hundreds of small-sized coral mounds exist in water depths between 500 and 1000 m, which rarely reach elevations higher than 10-20 m above the seafloor. Today, living CWC are almost completely absent in this Moroccan Atlantic Coral Province (MACP) while fossil coral accumulations are widespread. Moreover, it has been shown that along the Moroccan Atlantic margin CWC growth (and thus mound accretion) was most pronounced during the last glacial, presumably triggered by enhanced productivity, and terminated with the onset of the Holocene. However, these findings just refer to the upper 6 meters of the coral mounds, as up to date no longer material was available. During expedition MSM36 with RV MARIA S. MERIAN in spring 2014, records with remarkable long recoveries of several tens of meters were collected along the Moroccan Atlantic margin with the MARUM sea floor drill rig MeBo. Thereby, two coral mounds of the MACP could be completely penetrated down to their bases. The two obtained "on-mound" MeBo records (reaching max. drilling depths of ~47-52 m) will allow to gain some substantial and detailed insight into the initiation and early development of the Moroccan coral mounds, which is essentially unknown so far. In addition, an "off-mound" MeBo record (comprising two parallel drillings) was retrieved from an area in between the Moroccan coral mounds reaching maximum drilling depths of 45 m. This record will provide unique palaeoceanographic information about climate-driven environmental changes covering several glacial-interglacial cycles, and thus, will allow to test if the link between surface water productivity and CWC growth as identified for the last glacial is a long-lasting feature in the MACP. Moreover, the off-mound record was placed in an area marked by numerous buried mounds which comprise different generations of coral mounds rooted on different reflectors, thus allowing for an assessment of the nature of those reflectors forming either the base of the mounds or the first coverage once the mounds stopped growing. Overall, the four MeBo cores selected for the proposed project offer high-quality records, which will significantly improve our understanding of the ultimate climatic link driving the forcing factors that control the occurrence and development of CWC in the MACP. In particular with the now available complete mound records some fundamental topics in CWC and coral mound research can be addressed.

硬珊瑚冷水珊瑚（CWC）能够形成实质性的三维海底结构，所谓的珊瑚土丘。这些土丘由《化学武器公约》的碎片和半远洋沉积物组成，这些沉积物经过数千年至数百万年的沉积。沿着摩洛哥大西洋边缘，数百个小型珊瑚土丘存在于500至1000 m的水深中，这些珊瑚丘的海拔很少超过海底以上10-20 m。今天，在摩洛哥大西洋珊瑚省（MACP）几乎完全没有活的CWC，而化石珊瑚堆积广泛。此外，它已被证明，沿着摩洛哥大西洋边缘CWC的增长（从而土墩加积）是最明显的末次冰期，大概是由生产力的提高，并终止了全新世的开始。然而，这些发现仅指珊瑚土丘上部6米的区域，因为迄今为止不再有材料可用。在探险期间，MSM 36与RV MARIA S。在2014年春季的MERIAN中，使用MARUM海底钻机MeBo沿沿着摩洛哥大西洋边缘收集了具有数十米长的显著恢复的记录。因此，MACP的两个珊瑚土丘可以完全穿透到它们的底部。这两个人获得了“土墩”MeBo记录（达到最大。钻探深度约为47-52米）将使我们能够对摩洛哥珊瑚土丘的形成和早期发展有一些实质性的详细了解，这是迄今为止基本上未知的。此外，从摩洛哥珊瑚土丘之间的一个地区获得了“丘外”MeBo记录（包括两个平行钻孔），最大钻孔深度为45米。这一记录将提供关于气候驱动的环境变化的独特的古海洋学信息，涵盖几个冰川-间冰期周期，因此，将允许测试地表水生产力和化学武器公约增长之间的联系，确定为末次冰期是一个长期的功能，在MACP。此外，丘外记录被放置在一个有许多埋藏土丘的地区，这些丘包括扎根于不同反射体的不同世代的珊瑚土丘，从而可以评估这些反射体的性质，这些反射体要么构成土丘的基础，要么构成土丘停止生长后的第一个覆盖面。总的来说，为拟议项目选择的四个MeBo岩心提供了高质量的记录，这将大大提高我们对驱动MACP中控制化学武器公约发生和发展的强迫因素的最终气候联系的理解。特别是有了现有的完整的丘记录，就可以解决《化学武器公约》和珊瑚丘研究中的一些基本问题。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Multiple generations of buried cold-water coral mounds since the Early-Middle Pleistocene Transition in the Atlantic Moroccan Coral Province, southern Gulf of Cádiz

加的斯湾南部大西洋摩洛哥珊瑚省自早中更新世过渡以来的多代埋藏冷水珊瑚丘

DOI：
10.1016/j.palaeo.2017.06.021
发表时间：
2017
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
0
作者：
Vandorpe T;Wienberg C;Hebbeln D;Van den Berghe M;Gaide S;Wintersteller P;Van Rooij D
通讯作者：
Van Rooij D

8 Highly Variable Submarine Landscapes in the Alborán Sea Created by Cold-Water Corals

阿尔博兰海中由冷水珊瑚形成的 8 个高度可变的海底景观