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首页> 外文期刊>Marine Geology >Detrital and early diagenetic processes in Late Pleistocene and Holocene sediments from the SW Galicia Bank inferred from high-resolution enviromagnetic and geochemical records
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Detrital and early diagenetic processes in Late Pleistocene and Holocene sediments from the SW Galicia Bank inferred from high-resolution enviromagnetic and geochemical records

机译：从高分辨率环境磁和地球化学记录推断出西南加利西亚银行晚更新世和全新世沉积物的碎屑和早期成岩过程

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摘要

U-channel-based high-resolution magnetic and geochemical measurements supported by scanning electron microscopy, X-ray diffraction and fluorescence, and grain-size analyses of discrete samples were carried out on six sediment cores recovered from the SW flank of the Galicia Bank, at the Prestige's wreck area. Five magnetochemical facies, reflecting the different sedimentary environments (i.e. hemipelagic, contouritic, turbiditic), sediment provenances and early diagenetic redoxomorphic processes (i.e. Mn peaks) are defined on the basis of a cluster analysis. The records showed climatically forced detrital signatures of regional importance, associated with continental slope sedimentan processes. The chronostratigraphy and correlation of the cores is based on 20~(14)C AMS-dating, recognition of Heinrich like Event* H1 to H3 and well-documented Holocene climatic features. From a geochemical and enviromagnetic perspective, the Late Pleistocene to Holocene evolution of the area shows (we different sedimentation contexts. MIS 2 is dominated by down-slope depositional processes. The highest sedimentation rates (9.1 cm/ky) were achieved during this interval. The major turbidite activity is recorded between approx = 31 000 yr BP and approx = 13 500 yr BP. Successive arrivals of IRD (H1 to H3) are also identified during this period. In contrast, Holocene sedimentation was dominated by a mixture of pelagic, hemipelagic and along-slope depositional processes and presented considerable lower sedimentation rates (3 cm/ky). Bottom-currents intensification at 7000 yr BP and 4500 yr BP coinciding with Late Holocene warm events are also recognised during this stage.
机译：扫描电子显微镜，X射线衍射和荧光技术支持基于U通道的高分辨率磁和地球化学测量，并对从加利西亚银行西南侧回收的六个沉积岩心进行了离散样品的粒度分析，在威望的残骸区域在聚类分析的基础上定义了五个磁化学相，反映了不同的沉积环境（即半沉积，轮廓，湍流），沉积物出处和早期成岩作用的氧化还原形态（即Mn峰）。记录表明，气候强迫性碎屑特征具有区域重要性，与大陆斜坡沉积过程有关。岩心的年代地层学和相关性基于20〜（14）C AMS测年，对海因里希（如事件* H1至H3）的识别以及有据可查的全新世气候特征。从地球化学和环境磁学的角度来看，该地区的晚更新世至全新世演化表明（在不同的沉积环境下。MIS2主要由下坡沉积过程控制。在此间隔内实现了最高沉积速率（9.1 cm / ky）。在大约= 31 000 yr BP和大约= 13 500 yr BP之间记录了主要的浊度活动。在此期间，IRD也连续到达（H1至H3）。与此相反，全新世沉积主要由上层沉积，在近海沉积和沿斜坡沉积过程中，沉积速率较低（3 cm / ky），在该阶段也认识到在7000 yr BP和4500 BP BP的底流激增与晚全新世相吻合。

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