A revised Early Miocene age for the instigation of the Eirik Drift, offshore southern Greenland: Evidence from high-resolution seismic reflection data

A revised Early Miocene age for the instigation of the Eirik Drift, offshore southern Greenland: Evidence from high-resolution seismic reflection data
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格陵兰岛南部近海埃里克漂移引发的修正的早中新世年龄:来自高分辨率地震反射数据的证据

DOI:
10.1016/j.margeo.2013.04.012
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发表时间:
2013
期刊:
影响因子:
2.9
通讯作者:
Uenzelmann-Neben
Uenzelmann-Neben
中科院分区:
地球科学2区
文献类型:
--
作者:
Müller-Michaelis;Uenzelmann-Neben

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Eirik漂移位于格陵兰岛南部的大陆坡上,在北方成分水(NCW)的影响下形成。NCW流是全球温盐环流(THC)的重要组成部分,与全球气候密切相关。NCW流的路径和强度的变化承载着气候变化中北大西洋THC变化的信息。关于深海流控制的Eirik漂移沉积何时开始,存在一些分歧。虽然漂移建设的开始,以前的日期为上新世早期或晚中新世的年龄,我们认为,大规模的电流沉积的影响已经开始了至少19-17 Ma的基础上,地震地层学分析的沉积结构中确定的一组高分辨率的地震反射数据。这一假设的早中新世NCW流的发病支持的区域证据有关的格陵兰-苏格兰海脊,这是记录在北大西洋内的几个侵蚀不整合面的突破。在Eirik漂移的深流控制沉积开始后,在中新世期间,深流系统中的两个主要变化被揭示:在中新世中期至晚期的边界(12-10 Ma)和在7.5 Ma。
The Eirik Drift lies on the continental slope south of Greenland, where it has been formed under the influence of Northern Component Water (NCW). NCW flow is an essential part of the global Thermohaline Circulation (THC), which is closely connected to the world's climate. Changes in pathways and intensity of NCW flow bear information about modifications of the North Atlantic THC in a changing climate. There is some disagreement about when deep-current controlled sedimentation at the Eirik Drift started. While the onset of drift building was previously dated as early Pliocene or late Miocene in age we suggest that the effect of large-scale current deposition had been initiated by at least 19–17 Ma based on the seismostratigraphic analysis of sedimentary structures identified in a set of high-resolution seismic reflection data. This assumption of an early Miocene onset of NCW flow is supported by regional evidence regarding the breaching of the Greenland–Scotland Ridge, which is documented in several erosional unconformities within the North Atlantic. After the onset of deep-current controlled sedimentation at the Eirik Drift, two major changes in the deep-current system are revealed during the Miocene: At the mid- to late Miocene boundary (12–10 Ma) and at 7.5 Ma.
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