The last Glacial–Interglacial transition in Patagonia, Argentina: the stable isotope record of bulk sedimentary organic matter from Laguna Potrok Aike

The last Glacial–Interglacial transition in Patagonia, Argentina: the stable isotope record of bulk sedimentary organic matter from Laguna Potrok Aike
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阿根廷巴塔哥尼亚最后一次冰期-间冰期转变:来自拉古纳波特罗克艾克的大量沉积有机质的稳定同位素记录

DOI:
10.1016/j.quascirev.2012.05.025
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发表时间:
2013
影响因子:
4
通讯作者:
the PASADO science team
the PASADO science team
中科院分区:
地球科学1区
文献类型:
--
作者:
Lücke;Wissel;Müller;Ohlendorf;Zolitschka;the PASADO science team

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稳定同位素的研究(δ 13 CTOC和δ 15 NTN)和元素参数(TOC,巴塔哥尼亚湖拉古纳Potrok Aike沉积柱样中<200 μm有机质的总氮含量和总有机碳/总氮比值(阿根廷)在ICDP深钻项目的框架内,PASADO提供了对过去整个南巴塔哥尼亚湖泊初级生产力和环境条件变化的见解。冰川-间冰期过渡。所有代理参数的地层约束聚类分析表明,四个主要阶段。从约26,100至17,300 cal.年BP,湖泊浮游植物可能是主要的有机质来源,在水生环境中,初级生产率低。在大约17,300 cal.年BP,同位素和元素值的突然和明显的变化表明,湖泊系统经历了快速重组。湖泊初级生产力(浮游植物和水生植物)显示出较高的水平,尽管在大部分的冰消期,直到13,000 cal.年BP的变化很大。这一发展的主要原因是,由于冰消期变暖,加上营养物质的方便供应和可能的无风条件,初级生产者的生长条件得到改善。13,000 cal. years BP后,δ 13 CTOC值、TOC、TN含量和TOC/TN比值的下降表明,湖泊进入了初级生产力下降的新状态,可能是由于风力增强和营养盐有效性降低等不利于初级生产者的生长条件所致。δ 15 NTN值的稳定增加可能表明,在前一个高生产力阶段之后,由于养分短缺,初级生产者生长所需的硝酸盐供应受到限制。硝酸盐限制和随之而来的湖泊初级生产力下降持续到全新世早期(10,970 -8400 cal. years BP),反映了同位素和元素值。
An investigation of stable isotope (δ13CTOC and δ15NTN) and elemental parameters (TOC, TN contents and TOC/TN ratios) of bulk organic matter (<200 μm) from sediment cores recovered from the Patagonian lake Laguna Potrok Aike (Argentina) in the framework of the ICDP deep drilling project PASADO provided insights into past changes in lake primary productivity and environmental conditions in South Patagonia throughout the last Glacial–Interglacial transition. Stratigraphically constrained cluster analyses of all proxy parameters suggest four main phases. From ca 26,100 to 17,300 cal. years BP, lacustrine phytoplankton was presumably the predominant organic matter source in an aquatic environment with low primary productivity rates. At around 17,300 cal. years BP, abrupt and distinct shifts of isotopic and elemental values indicate that the lacustrine system underwent a rapid reorganization. Lake primary productivity (phytoplankton and aquatic macrophytes) shows higher levels albeit with large variations during most of the deglaciation until 13,000 cal. years BP. The main causes for this development can be seen in improved growing conditions for primary producers because of deglacial warming in combination with expedient availability of nutrients and likely calm wind conditions. After 13,000 cal. years BP, decreased δ13CTOCvalues, TOC, TN contents and TOC/TN ratios indicate that the lake approached a new state with reduced primary productivity probably induced by unfavourable growing conditions for primary producers like strengthened winds and reduced nutrient availability. The steady increase in δ15NTNvalues presumably suggests limitation of nitrate supply for growth of primary producers resulting from a nutrient shortage after the preceding phase with high productivity. Nitrate limitation and consequent decreased lacustrine primary productivity continued into the early Holocene (10,970–8400 cal. years BP) as reflected by isotopic and elemental values.
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