Climatic control on magnetic mineralogy during the late MIS 6 - Early MIS 3 in Lake Chalco, central Mexico
Climatic control on magnetic mineralogy during the late MIS 6 - Early MIS 3 in Lake Chalco, central Mexico
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DOI：
10.1016/j.quascirev.2020.106163
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发表时间：
2020-02
影响因子：
4
通讯作者：
B. Ortega‐Guerrero;D. Avendaño;M. Caballero;S. Lozano-García;E. Brown;Alejandro W. Rodriguez;B. M. García;Hermenegildo Barceinas;A. Soler;Albán Albarrán
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作者：
B. Ortega‐Guerrero;D. Avendaño;M. Caballero;S. Lozano-García;E. Brown;Alejandro W. Rodriguez;B. M. García;Hermenegildo Barceinas;A. Soler;Albán Albarrán
从墨西哥中部的查尔科湖沉积物跨越约。150至35 ka前提供的证据表明，北美热带地区的古气候变化与海洋同位素阶段（MIS）6的结束有关，即向末次间冰期（MIS 5.5，约1.5万年）的过渡。130-115 ka前）和部分末次冰期（MIS 5.4-早期MIS 3，115 - 35 ka前）。我们采用了多代理方法的基础上分析矿物磁性，硅藻组合和主要元素地球化学。重建的古环境历史确定了全球凉爽的MIS 6结束时比现在更潮湿，湖泊水位高，随后在最后一次间冰期开始时气候变干。130 ka）。大幅度的变化，在大多数分析参数从ca。130 ~ 74 ka与MIS 5（130-71 ka）大致一致。在MIS 4期（71-57 ka）和MIS 3早期（57-35 ka），这些变化的幅度减小。我们提出，推断气候振荡跟随太阳辐射变化期间MIS 6和部分MIS 5（150-88 ka）。夏季和春季低日照和较低的季节性抑制蒸发和有利于高湖水位。相反，在春季和夏季日照最大促进干燥的条件和低湖水位。的的喀喀湖（玻利维亚）和查尔科湖记录中发现的主要的湿冷冰期和干热间冰期关系表明高海拔热带地区对气候变化的敏感性。
Sediments from Lake Chalco in central Mexico spanning from ca. 150 to 35 ka ago provide evidence of paleoclimatic variability in the North American tropics associated with the end of Marine Isotopic Stage (MIS) 6, the transition to the last interglacial (MIS 5.5, ca. 130-115 ka ago), and part of the last glacial (MIS 5.4 to early MIS 3, 115 to 35 ka ago). We applied a multiproxy approach based on the analysis of mineral magnetism, diatom assemblages and major elements geochemistry. The reconstructed paleoenvironmental history identify the end of the globally cool MIS 6 as wetter than present, with high lake level, and a subsequent change to drier climates at the onset of the last interglacial (ca. 130 ka). Large amplitude changes in most of the analyzed parameters from ca. 130 to 74 ka are approximately coincident with MIS 5 (130-71 ka). The amplitude of these changes decreases in MIS 4 (71-57 ka) and the early part of MIS 3 (57-35 ka). We proposed that the inferred climatic oscillations follow insolation variations during MIS 6 and part of MIS 5 (150-88 ka). Low summer and spring insolation and lower seasonality inhibited evaporation and favored high lake levels. Conversely, maxima in spring and summer insolation promoted dry conditions and low lake levels. The major wet-cold glacial and dry-warm interglacial relationship found in Lake Titicaca (Bolivia) and Lake Chalco records shows the sensitivity of high altitude tropical sites to climatic variability.