The influence of siliciclastic input on Chaetoceros abundance in an early Pliocene segment of the ANDRILL AND-1B drill core

The influence of siliciclastic input on Chaetoceros abundance in an early Pliocene segment of the ANDRILL AND-1B drill core
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硅质碎屑输入对 ANDRILL AND-1B 钻芯上新世早期部分角毛藻丰度的影响

DOI:
10.1016/j.palaeo.2012.05.027
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发表时间:
2012
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Scherer RP
Scherer RP
中科院分区:
--
文献类型:
--
作者:
Konfirst MA;Kuhn G;Monien D;Scherer RP

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2006/7年夏季,ANDRILL MIS(南极地质钻探-麦克默多冰架)项目在南极罗斯岛附近的罗斯冰架下采集了一个1285米的沉积物岩心。该岩芯上部~ 600 m范围内的沉积物记录了上新世早期至更新世时期的38个冰期/间冰期旋回,包括13个离散的冰期单元(DU)。其中最厚的是杜溪,厚约76米,被认为是上新世早期(5- 3 Ma),代表了几个不间断的沉积物堆积时期。结合地球化学和生物学数据被用来研究硅藻群落组成的沉积物源区的变化的作用。来自用XRF岩心扫描仪收集的数据的峰面积计数比包括K:Fe和Ti:K。在火山岩系中,K值较低,Ti值较高。K:Fe是通过陆地和海洋沉积过程(冰川、河流、风成、重力、海流)输送到现场的细粒沉积物源区的指标,而Ti:K主要与罗斯海火山源有关。这两个元素比值的比较显示出反相关性,表明烃源岩随时间的变化。此外,相对丰度的硅藻属,角毛藻,在相同的意义和幅度的变化K:Fe,这表明,气候驱动的变化,沉积物源区的丰度的变化。有人建议,增加TAM来源的沉积物在ANDRILL和-1B网站造成的水柱中的营养水平增加,导致本属的水华,这是符合目前已知的生态偏好。
In the austral summer of 2006/7 the ANDRILL MIS (ANtarctic geological DRILLing- McMurdo Ice Shelf) project recovered a 1285m sediment core from beneath the Ross Ice Shelf near Ross Island, Antarctica. Contained within the upper ~600m of this core are sediments recording 38 glacial/interglacial cycles of Early Pliocene to Pleistocene time, including 13 discrete diatomite units (DU). The thickest of these, DU XI, is ~76m thick, has been assigned an Early Pliocene age (5–3Ma), and represents several extended periods of uninterrupted sediment accumulation. A combination of geochemical and biological data was used to examine the role of changes in sediment source areas on diatom community composition. Peak-area count-ratios from the data collected with the XRF core scanner include K:Fe and Ti:K. K is lower and Ti higher in the volcanic series sampled. K:Fe is an indicator of the source area of fine-grained sediment delivered to the site by terrestrial and marine sedimentary processes (glacial, fluvial, eolian, gravitational, marine currents), while Ti:K is primarily associated with Ross Sea volcanic sources. A comparison of these two elemental ratios shows an anti-correlation, indicating changes in source rocks with time. Furthermore, relative abundance of the diatom genus, Chaetoceros, varies in the same sense and magnitude as K:Fe, suggesting that climatically-driven changes in sediment source regions are related to variations in abundance. It is suggested that increases in TAM-sourced sediment at the ANDRILL AND-1B site caused increased nutrient levels in the water column, leading to blooms of this genus, which is consistent with current known ecological preferences.
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