Patagonian Aridification at the Onset of the Mid-Miocene Climatic Optimum

Robin B. Trayler; Matthew J. Kohn; M. Susana Bargo; José I. Cuiti?o; Richard F. Kay; Caroline A. E. Str?mberg; Sergio F. Vizcaíno

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Patagonian Aridification at the Onset of the Mid-Miocene Climatic Optimum

机译：巴塔哥尼亚人在中间肾上腺气候最佳的发作时进行

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Fossil-rich sediments of the Santa Cruz Formation, Patagonia, Argentina, span the initiation of the Miocene Climatic Optimum (MCO), the most recent period of warm and wet conditions in the Cenozoic. These conditions drove the expansion of tropical and subtropical ecosystems to much higher latitudes, with the fossiliferous Santa Cruz Formation recording one of the southernmost examples. We collected new carbon and oxygen isotope compositions of herbivore tooth enamel from fossils ~17.4 to 16.4 Ma in age to investigate ecological and climatic changes across the initiation of the MCO. Enamel δ~(13)C values are consistent with a C3-dominated ecosystem with moderate precipitation and a mix of wooded and more open areas. Serially sampled teeth reveal little zoning in δ~(13)C and δ~(18)O values, suggesting little seasonal variation in water and plant isotope compositions or seasonal changes in diet. Carbon isotope-based estimates of mean annual precipitation (MAP) are consistent with aridification, with MAP decreasing from ~1,000 ± 235 mm/yr at 17.4 Ma to ~525 ± 105 mm/yr at the start of the climatic optimum (~16.9 Ma). This decrease corresponds to increasing global temperatures, as indicated by marine proxy records, and was followed by a rebound to ~840 ± 270 mm/yr by ~16.4 Ma. In comparison to a modern mean annual temperature (MAT) in the region of ~8°C, oxygen isotopes indicate high MAT (at least 20°C) at the onset of the MCO at 16.9 Ma and a significant increase in MAT to ~25°C by 16.4 Ma.

机译：阿根廷巴塔哥尼亚圣克鲁斯组富含化石的沉积物跨越了中新世气候最佳期（MCO）的开始，这是新生代最新的温暖湿润期。这些条件促使热带和亚热带生态系统扩展到更高的纬度，其中最南端的圣克鲁斯化石地层就是一例。我们从年龄约为17.4至16.4 Ma的化石中收集了新的草食性牙釉质碳氧同位素组成，以研究MCO开始期间的生态和气候变化。珐琅质δ~（13）C值与一个以C3为主的生态系统一致，该生态系统具有中等的降水量，并且混合了树木和更开阔的区域。连续采样的牙齿显示δ~（13）C和δ~（18）O值几乎没有分区，表明水和植物同位素组成或饮食的季节性变化很小。基于碳同位素的年平均降水量（MAP）估计值与干旱化一致，MAP从17.4 Ma时的约1000±235 mm/年降至气候最佳期开始时的约525±105 mm/年（~16.9 Ma）。如海洋代理记录所示，这一下降对应于全球气温的升高，随后反弹至约840±270毫米/年，时间约为16.4毫安。与~8°C区域的现代年平均温度（MAT）相比，氧同位素表明，在16.9 Ma MCO开始时，MAT较高（至少20°C），MAT显著增加至~25°C 16.4 Ma。

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来源
《Paleoceanography》 |2020年第9期|共20页
作者
Robin B. Trayler; Matthew J. Kohn; M. Susana Bargo; José I. Cuiti?o; Richard F. Kay; Caroline A. E. Str?mberg; Sergio F. Vizcaíno;
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作者单位

Department of Life and Environmental Sciences University of California Merced Merced CA USA;

Department of Geosciences Boise State University Boise ID USA;

División Paleontología de Vertebrados Museo de La Plata Unidades de Investigación (CIC and CONICET) La Plata Argentina;

Instituto Patagónico de Geología y Paleontología CENPATCONICET Puerto Madryn Argentina;

Department of Evolutionary Anthropology Trinity College and Division of Earth and Ocean Sciences Nicholas School of the Environment Duke University Durham NC USA;

Department of Biology and Burke Museum of Natural History and Culture University of Washington Seattle WA USA;

División Paleontología de Vertebrados Museo de La Plata Unidades de Investigación (CIC and CONICET) La Plata Argentina;

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原文格式 PDF
正文语种 eng
中图分类海洋学;
关键词
Patagonian; Aridification; Mid-Miocene;

机译：巴塔哥尼亚人;Aridification;中间内部;

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Patagonian Aridification at the Onset of the Mid-Miocene Climatic Optimum

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