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Paleoenvironmental changes in southern South American dust sources during the last glacial/interglacial transition: Evidence from clay mineral assemblages of the pampean loess
Quaternary International ( IF 1.9 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.quaint.2020.12.044
Matías Romero , Gabriela Torre , Diego M. Gaiero

Paleoclimatic reconstruction is critical for understanding present-day climate and for testing models that are currently used to predict future climatic changes. Different climatic conditions produce different clay minerals that can be recorded in geological archives providing insights into past weathering scenarios. However, in southern South America, scarce information is available from clay mineral assemblages found in aeolian sediments, such as loess deposits. Moreover, there is a lack of studies employing clay minerals for paleoclimatic reconstruction at dust sources and loess deposits. Therefore, this work explores clay mineral composition of modern dust source areas in southern South America and in the pampean loess records to gain insight into paleoenvironmental conditions prevailing during the late Pleistocene-early Holocene in the region. Clay minerals recovered from the loess deposits are of an allochthonous origin, implying their formation at the ‘arid diagonal’, then blown away, and deposited downwind in the Pampas without post-depositional changes. Clay mineral assemblages indicate that these minerals and rare earth elements (REE) analyzed in two loess sections of the Pampean Plain helped to reconstruct past climatic scenarios in the dust source areas during the transition from the last glacial to the current interglacial period. Furthermore, our work contributes to the assessment of the strengthening/weakening of the different South American dust sources in light of recent published geochemical and textural evidence.



中文翻译:

最后一次冰川/间冰期过渡期间南美南部粉尘源的古环境变化:来自黄土黄土粘土矿物组合的证据

古气候重建对于理解当今的气候和测试目前用于预测未来气候变化的模型至关重要。不同的气候条件会产生不同的粘土矿物,这些矿物可以记录在地质档案中,从而提供对过去风化情景的洞察。但是,在南美洲南部,从风沙沉积物中发现的粘土矿物组合(如黄土沉积物)可获得的信息很少。而且,缺乏研究利用粘土矿物在尘埃源和黄土沉积物上进行古气候重建。因此,这项工作探索了南美南部和黄土黄土记录中现代尘埃源地区的粘土矿物组成,以了解该地区晚更新世-早全新世期间普遍存在的古环境条件。从黄土矿床中回收的粘土矿物是异源的,这意味着它们在“干旱对角线”形成,然后被吹散并顺风沉积在潘帕斯地区,而无沉积后的变化。粘土矿物组合表明,在从上一个冰期到当前冰期之间的过渡期间,在庞贝平原的两个黄土区中分析的这些矿物和稀土元素(REE)有助于重建尘埃源地区的过去气候情景。此外,根据最近发表的地球化学和质地证据,我们的工作有助于评估南美不同尘埃源的强化/减弱。并沉积在潘帕斯州的顺风而无沉积后变化。粘土矿物组合表明,在从上一个冰期到当前冰期之间的过渡期间,在庞贝平原的两个黄土区中分析的这些矿物和稀土元素(REE)有助于重建尘埃源地区的过去气候情景。此外,根据最近发表的地球化学和质地证据,我们的工作有助于评估南美不同尘埃源的强化/减弱。并沉积在潘帕斯州的顺风而无沉积后变化。粘土矿物组合表明,在从上一个冰期到当前冰期之间的过渡期间,在庞贝平原的两个黄土区中分析的这些矿物和稀土元素(REE)有助于重建尘埃源地区的过去气候情景。此外,根据最近发表的地球化学和质地证据,我们的工作有助于评估南美不同尘埃源的强化/减弱。粘土矿物组合表明,在从上一个冰期到当前冰期之间的过渡期间,在庞贝平原的两个黄土区中分析的这些矿物和稀土元素(REE)有助于重建尘埃源地区的过去气候情景。此外,根据最近发表的地球化学和质地证据,我们的工作有助于评估南美不同尘埃源的强化/减弱。粘土矿物组合表明,在从上一个冰期到当前冰期之间的过渡期间,在庞贝平原的两个黄土区中分析的这些矿物和稀土元素(REE)有助于重建尘埃源地区的过去气候情景。此外,根据最近发表的地球化学和质地证据,我们的工作有助于评估南美不同尘埃源的强化/减弱。

更新日期:2021-03-16
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