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

Multiple generations of buried cold-water coral mounds since the Early-Middle Pleistocene Transition in the Atlantic Moroccan Coral Province, southern Gulf of Cádiz
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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
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发表时间:
2017
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Van Rooij D
Van Rooij D
中科院分区:
--
文献类型:
--
作者:
Vandorpe T;Wienberg C;Hebbeln D;Van den Berghe M;Gaide S;Wintersteller P;Van Rooij D

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冷水珊瑚丘是北大西洋常见的海底地貌,主要局限于200米至1000米之间的水深。珊瑚丘由珊瑚碎片和半深海沉积物组成,反映出与珊瑚生命力有关的丘状沉积和侵蚀的复杂历史。在摩洛哥边缘的南加迪斯湾,最近发现了一块大油田(延伸:1800平方米),有781个相对较小的埋藏和裸露的土丘(平均高度约20米)。在所谓的大西洋摩洛哥珊瑚省(AMCP),这些丘陵至少在十个不同的地平线上开始,所有这些地平线都很可能与早-中更新世过渡以来的冰期有关。假定海底洋流的加剧与扎根于每一已确定的层位上的珊瑚丘的数量之间有很强的联系。在MIS14和MIS12之间还观察到珊瑚丘开始的平均水深向更深的区域移动,并伴随着丘高的增加。最后,泥沙输入减少或减少被认为是导致AMCP珊瑚丘与其他大西洋丘省相比较小的主要因素之一。
Cold-water coral mounds are common seabed features in the North Atlantic Ocean, where they are mainly restricted to water depths between 200 m and 1000 m. Coral mounds consist of coral fragments and hemipelagic sediments, reflecting an often complex history of mound aggradation and erosion linked to coral vitality. In the southern Gulf of Cádiz along the Moroccan margin, a large field (extension: 1800 km2) of 781 comparatively small buried and exposed mounds (average height: about 20 m) has recently been discovered. The mounds in the so-called Atlantic Moroccan Coral Province (AMCP) initiated on at least ten different horizons, all of them most likely related to glacial periods since the Early-Middle Pleistocene Transition. A strong link between the intensification of bottom currents and the number of coral mounds rooting on each of the identified horizons is assumed. Also a shift of the average water depth at which coral mounds initiated towards deeper regions and an accompanied increase in mound height is observed between MIS 14 and MIS 12. Finally, reduced or low sediment input is regarded as one of the main factors causing the rather small size of coral mounds in the AMCP in comparison to other Atlantic mound provinces.
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