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| DOI | 10.1029/2023PA004687 |
| Biomarker Evidence for an MIS M2 Glacial-Pluvial in the Mojave Desert Before Warming and Drying in the Late Pliocene | |
| 发表日期 | 2024 |
| ISSN | 2572-4517 |
| EISSN | 2572-4525 |
| 起始页码 | 39 |
| 结束页码 | 1 |
| 卷号 | 39期号:1 |
| 英文摘要 | Ancient lake deposits in the Mojave Desert indicate that the water cycle in this currently dry place was radically different under past climates. Here we revisit a 700 m core drilled 55 years ago from Searles Valley, California, that recovered evidence for a lacustrine phase during the late Pliocene. We update the paleomagnetic age model and extract new biomarker evidence for climatic conditions from lacustrine deposits (3.373-2.706 Ma). The MBT ' 5Me temperature proxy detects present-day conditions (21 +/- 3 degrees C, n = 2) initially, followed by warmer-than-present conditions (25 +/- 3 degrees C, n = 17) starting at 3.268 and ending at 2.734 Ma. Bacterial and archeal biomarkers reveal lake salinity increased after 3.268 Ma likely reflecting increased evaporation in response to higher temperatures. The delta 13C values of plant waxes (-30.7 +/- 1.4 parts per thousand, n = 28) are consistent with local C3 taxa, likely expanded conifer woodlands during the pluvial with less C4 than the Pleistocene. delta D values (-174 +/- 5 parts per thousand, n = 25) of plant waxes indicate precipitation delta D values (-89 +/- 5 parts per thousand, n = 25) in the late Pliocene are within the same range as the late Pleistocene precipitation delta D. Microbial biomarkers identify a deep, freshwater lake and a cooling that corresponds to the onset of major Northern Hemisphere glaciation at marine isotope stage marine isotope stages M2 (3.3 Ma). A more saline lake persisted for similar to 0.6 Ma across the subsequent warmth of the late Pliocene (3.268-2.734 Ma) before the lake desiccated at the Pleistocene intensification of Northern Hemisphere Glaciation. During a generally warm period 3 million years ago, there were large lakes in the Mojave Desert, California. We measured organic matter preserved in ancient lake mud below today's salt flat in Searles Valley to investigate the climate changes that sustained these 3-million-year-old lakes. We compiled evidence for a freshwater lake, increased rainfall, and woody plants around the lake during a cooler interval, with similar-to-modern temperatures, that interrupted what was generally a warm period between 5 and 3 million years ago. Today the valley contains a saltpan, the evaporated remains of the former lake, surrounded by open desert shrubland. We compare the evidence from the lake with other climate reconstructions and find the wetter conditions coincided with cooling both locally and at higher latitudes. Lacustrine sediments in Mojave Desert sediment core span 3.373-2.706 MaMicrobial biomarkers record deep, fresh lake during cool period 3.373-3.268 MaLake salinity increases after 3.268 Ma, associated with warming |
| 英文关键词 | biomarker; Pliocene; lacustrine; plant wax; GDGT |
| 语种 | 英语 |
| WOS研究方向 | Geology ; Oceanography ; Paleontology |
| WOS类目 | Geosciences, Multidisciplinary ; Oceanography ; Paleontology |
| WOS记录号 | WOS:001137132200001 |
| 来源期刊 | PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/306482 |
| 作者单位 | University of Southern California; Syracuse University; University of Arizona; California State University System; California State University Fullerton; State University of New York (SUNY) System; State University of New York (SUNY) Binghamton |
| 推荐引用方式 GB/T 7714 | . Biomarker Evidence for an MIS M2 Glacial-Pluvial in the Mojave Desert Before Warming and Drying in the Late Pliocene[J],2024,39(1). |
| APA | (2024).Biomarker Evidence for an MIS M2 Glacial-Pluvial in the Mojave Desert Before Warming and Drying in the Late Pliocene.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,39(1). |
| MLA | "Biomarker Evidence for an MIS M2 Glacial-Pluvial in the Mojave Desert Before Warming and Drying in the Late Pliocene".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 39.1(2024). |
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