Sedimentology and geochemistry of an exceptionally preserved last interglacial sapropel S5 in the Levantine Basin (Mediterranean Sea)
Sedimentology and geochemistry of an exceptionally preserved last interglacial sapropel S5 in the Levantine Basin (Mediterranean Sea)
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黎凡特盆地（地中海）保存完好的最后一个间冰期腐泥 S5 的沉积学和地球化学
DOI：
10.1016/j.margeo.2011.10.011
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发表时间：
2011
期刊：
影响因子：
2.9
通讯作者：
Kučera
中科院分区：
文献类型：
--
作者：
Moller;Schulz;Hamann;Dellwig;Kučera
对东地中海普林尼海沟地区3个重力岩心（M40-4 SL67、M51-3 SL103、M51-3 SL104）中发现的完全层状S5断层进行了岩性、地球化学和物理沉积性质的综合研究。S5的厚度在85 ~ 91cm之间，是地中海地区S5- S5的最大厚度。根据砂层颜色、厚度等光学特征，将砂推进体划分为13个不同的岩性地层带。这些区域，以及它们内部更精细的分层模式，可以在三个岩心之间精确地遵循，这表明造成这种变化的过程至少在区域尺度上起作用。腐冲积物孔隙度异常高，与Si/Ca含量密切相关。这一关系表明，藻推进体本质上是一种富含有机物的硅藻土，其特殊的厚度可以通过保存硅藻形成松散堆积的沉积物结构来解释。与其他S5腐推体相比，硅藻的保存显然导致腐推体层厚度增加了两倍。通过超高分辨率（0.2mm）的xrf扫描仪测定了10种元素的相对丰度，这些元素的相对丰度覆盖了每个岩浆岩的整个长度，包括几厘米的封闭泥灰岩。化学数据分析表明，最下面13cm的泥岩在化学上与下伏的泥灰岩更相似，沉积物化学在不同尺度上表现出不同的信号。最强烈的模式是泥灰岩与周围泥灰岩之间的对比，这种对比在指示氧化还原条件以及陆源沉积物输入和生产力的元素中更加突出。在推进体内部，观察到毫米至厘米尺度的分层。许多元素的丰度与这些层的格局有系统的联系，表明它们有一个共同的起源，与生产力和/或陆源沉积和/或氧化还原条件有关。这一模式表明了与区域气候过程的联系，使M40-4 SL67、M51-3 SL103和M51-3 SL104的S5推进层成为地中海及其邻近大陆末次间冰期气候变化的潜在高分辨率档案。
A combined study of lithological, geochemical and physical sediment properties is reported from a completely laminated S5 sapropel, recovered in three gravity cores (M40-4 SL67, M51-3 SL103, M51-3 SL104) from the Pliny Trench region of the eastern Mediterranean. The thickness of the studied sapropel S5 varies between 85 and 91cm and tops most S5-sapropels in the Mediterranean. Based on optical features like color and thickness of laminae, the sapropels were subdivided into thirteen distinct lithostratigraphic zones. These zones, as well as the finer layering pattern within them, could be followed exactly among the three cores, indicating that the processes responsible for this variation acted at least on a regional scale. The sapropel sediment is characterized by exceptionally high porosity, which is strongly correlated with Si/Ca. This relationship implies that the sapropel is in essence an organic-matter rich diatomite and its exceptional thickness can be explained by preservation of diatoms forming a loosely packed sediment fabric. Compared to other S5 sapropels, the preservation of diatoms has apparently led to a twofold increase in the thickness of the sapropel layer. Relative abundances of 10 elements were determined at ultra-high resolution (0.2mm) by XRF-scanner over the complete length of each sapropel including several cm of enclosing marl. An analysis of the chemical data indicates that the lowermost 13cm of the sapropel is chemically more similar to the underlying marl and that the sediment chemistry shows different signals at different scales. The strongest pattern is the contrast between the sapropel and the surrounding marl, which is accentuated in elements indicative for redox conditions as well as terrigenous sediment input and productivity. Within the sapropel, a mm- to cm-scale layering is observed. The abundances of many elements are systematically linked to the pattern of these layers, indicating a common origin, related to productivity and/or terrigenous sediment and/or redox conditions. This pattern indicates a link to a regional climatic process, making the S5 sapropel horizon in M40-4 SL67, M51-3 SL103 and M51-3 SL104 a potential high-resolution archive of climatic variability during the last interglacial in the Mediterranean Sea and its adjacent landmasses.
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影响因子：
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