Late Quaternary sedimentation within a submarine channel-levee system offshore Cap Timiris, Mauritania

Late Quaternary sedimentation within a submarine channel-levee system offshore Cap Timiris, Mauritania
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毛里塔尼亚蒂米里斯角近海海底河道-堤坝系统内的晚第四纪沉积

DOI:
10.1016/j.margeo.2007.02.005
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发表时间:
2007
期刊:
影响因子:
2.9
通讯作者:
Henrich
Henrich
中科院分区:
地球科学2区
文献类型:
--
作者:
Zühlsdorff;Henrich

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根据Cap Timiris峡谷三个海洋沉积物记录的无碳酸盐粉粒部分的粒度分布,重建了毛里塔尼亚近海大西洋的风成和河流沉积物输送,以监测当今干旱的西北非洲的气候演变。在更新世晚期,主要是粗粒颗粒,被解释为风吹尘埃,冰川期干燥的气候条件下,海平面低,沙海延伸到毛里塔尼亚外的裸露大陆架。随后的颗粒细化和陆源供应的突然减少是由于潮湿的气候条件和沙丘稳定在邻近的非洲大陆的全新世湿润期的开始。全新世早期至中期最细的端部成员提供了古代排水系统的迹象,该系统通过Cap Timiris峡谷向海上排放河流泥浆。然而,与塞内加尔河和更南边的尼日尔河相比,连接Cap Timiris峡谷和毛里塔尼亚腹地的河流系统在全新世晚期已经干涸,在现今干旱的气候条件下也没有排放。
Aeolian and fluvial sediment transport to the Atlantic Ocean offshore Mauritania were reconstructed based on grain-size distributions of the carbonate-free silt fraction of three marine sediment records of Cap Timiris Canyon to monitor the climatic evolution of present-day arid north-western Africa. During the late Pleistocene, predominantly coarse-grained particles, which are interpreted as windborne dust, characterise glacial dry climate conditions with a low sea level and extended sand seas that reach onto the exposed continental shelf off Mauritania. Subsequent particle fining and the abrupt decrease in terrigenous supply are attributed to humid climate conditions and dune stabilisation on the adjacent African continent with the onset of the Holocene humid period. Indications for an ancient drainage system, which was discharging fluvial mud offshore via Cap Timiris Canyon, are provided by the finest end member for early to mid Holocene times. However, in comparison to the Senegal and Niger River further south, the river system connecting Cap Timiris Canyon with the Mauritanian hinterland was starved during the late Holocene and is non-discharging under present-day arid climate conditions.
毛里塔尼亚蒂米里斯角峡谷的白云岩和浊积岩的年龄模型
DOI: 10.1016/j.marpetgeo.2005.10.005
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卡普蒂米里斯峡谷:毛里塔尼亚近海新发现的水道系统
DOI: 10.1029/2004eo420001
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DOI: --
发表时间: 1989
期刊:
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