Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications
Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications
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MIS AND-1B 岩心（南极洲）上新世早期硅藻土层段的化学地层学：古环境影响
DOI：
10.1016/j.gloplacha.2013.01.001
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发表时间：
2013
影响因子：
3.9
通讯作者：
Kuhn G
中科院分区：
文献类型：
--
作者：
Scopelliti G;Bellanca A;Monien D;Kuhn G
在2006/07年南夏季期间，在ANDRILL（南极地质钻探）计划范围内，从漂浮的麦克默多冰架下方回收了AND-1B岩芯（1285米长）。钻探恢复了一个地层序列的交替diamictites，recruitites和volcanicrecruitites沉积物跨越约过去14马。对350至480 mbsf之间的岩芯部分（包括记录上新世早期变暖事件的80 m厚硅藻土层段）进行了蛋白石生物含量和元素地球化学研究。在整个白垩纪，尽管岩性均匀，但波动的生物蛋白石剖面反映了δ 18 O记录，证明当温度下降时，生产力下降，这是冰川波动的结果。生物蛋白石数据与角毛藻的比较。Konfirst等人（2012年）的丰度记录了分层表层沃茨初级生产力高时期和无冰条件下陆源输入增强时期之间的交替。聚类分析区分元素与陆源输入的生物控制。进一步分离子集群解释不同元素的反应，在物源的变化，但也在海底沉积/早期成岩条件。虽然K和Ti与不同的沉积物来源有关，证实了同一时间段的先前研究，但V、Zn和Fe（在较小程度上）记录了钙钛矿沉积期间的还原/缺氧条件（特别是在400- 460 mbsf时间段）。Mg，Sr和Mn含量与自生碳酸盐沉淀有关，而Ba感兴趣的是非稳态过程，导致富硫酸盐/贫硫酸盐孔隙水边界以下的钡的局部峰值，通常低程度的重晶石饱和度是负责Ba再活化。这种沉积动力学的变化，负责沉淀的贫氧钡相，可能是由沉积速率和/或古环境条件的变化引起的。
The AND-1B drill core (1285m-long) was recovered, inside the ANDRILL (ANtarctic geological DRILLing) Program, during the austral summer of 2006/07 from beneath the floating McMurdo Ice Shelf. Drilling recovered a stratigraphic succession of alternating diamictites, diatomites and volcaniclastic sediments spanning about the last 14Ma. A core portion between 350 and 480mbsf, including a 80m-thick diatomite interval recording the early Pliocene warming event, was investigated in term of opal biogenic content and element geochemistry. Across the diatomite interval, in spite of the lithological uniformity, a fluctuating biogenic opal profile mirrors the δ18O record, testifying a decrease in productivity when temperature drops as a consequence of small glacial fluctuations. The comparison of biogenic opal data with Chaetoceros spp. abundances from Konfirst et al. (2012) documents alternations between periods of high primary productivity in stratified surface waters and of enhanced terrigenous input in ice-free conditions. Cluster analysis discriminates elements associated to terrigenous input from those subject to biogenic control. Further separation in sub-cluster was interpreted in term of different element response to changes in provenance but also to depositional/early diagenetic conditions at the seafloor. Whilst K and Ti are related to different sediment sources confirming previous studies from the same interval, V, Zn and, to a lesser extent, Fe, document reducing/anoxic conditions during the diatomites deposition (in particular in 400–460mbsf interval). Mg, Sr and Mn contents are related to authigenic carbonate precipitation whilst Ba is interested by nonsteady-state processes leading to local peaks of barium below the sulphate-rich/sulphate-poor pore water boundary where generally the low degree of barite saturation is responsible for Ba remobilization. Such alteration in depositional dynamics, responsible of the precipitation of an oxygen-depleted barium phase, was probably induced by change in sedimentation rate and/or in palaeoenvironmental conditions.
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DOI：
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