Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1080/08120099.2021.1906747 |
| Paleosols and weathering leading up to Snowball Earth in central Australia | |
| Retallack, G. J. | |
| 通讯作者 | Retallack, GJ (corresponding author), Univ Oregon, Dept Geol Sci, 1275 East 13th Ave, Eugene, OR 97403 USA. |
| 来源期刊 | AUSTRALIAN JOURNAL OF EARTH SCIENCES
 |
| ISSN | 0812-0099 |
| EISSN | 1440-0952 |
| 出版年 | 2021 |
| 英文摘要 | The Cryogenian Period (717-635 Ma), or 'Snowball Earth', was an unusually cool period of Earth history when glaciers extended to low latitudes. Past ideas on causes of this widespread glaciation include increased consumption of atmospheric carbon dioxide by silicate weathering due to continental drift into tropical paleolatitudes, or by voluminous, easily weathered volcanic tuffs. Alternatively, carbon sequestration from the atmosphere may have been intensified by advances in biomass on land or at sea. These hypotheses are tested with a new study of red siltstones of the Johnnys Creek Formation (785-717 Ma) in central Australia, where paleosols have long been recognised. Although these dolomitic red siltstones look like shales, they lack lamination. Instead, they have the massive bedding and grainsize distribution of dolomitic and calcareous loess, which precede tillites of the Areyonga Formation. Paleomagnetic studies indicate little drift from a paleolatitude of 26.2 degrees during accumulation of the Johnnys Creek Formation. Nor does the Johnnys Creek Formation contain easily weathered volcanic ash, only local basalt flows. Paleoproductivity of the paleosols increases up section, as estimated in ppm soil CO2 from depth in paleosols to gypsic (By) and then calcic (Bk) horizons. Deepening and intensification of soil respiration reflects greater terrestrial carbon sequestration, and increased chemical weathering up section, and both would have drawn down atmospheric CO2. Comparable transition from gypsic to calcic soils in modern deserts reflects change from cyanobacterial-gypsic to fungal-algal calcic ecosystems. Snowball Earth glaciation may have been induced by evolutionary advances to eukaryotic and multicellular life on land, in the same way as Ordovician glaciation was induced by land plants, Permo-Carboniferous glaciation by trees, and Pleistocene glaciation by grasslands. |
| 英文关键词 | Neoproterozoic paleosol paleokarst Snowball Earth central Australia |
| 类型 | Article ; Early Access |
| 语种 | 英语 |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000652784700001 |
| WOS关键词 | BITTER-SPRINGS FORMATION ; VASE-SHAPED MICROFOSSILS ; OXYGEN-ISOTOPE RATIOS ; ATACAMA DESERT ; AMADEUS BASIN ; CRYOGENIAN GLACIATION ; PRECAMBRIAN PALEOSOLS ; GEOCHEMICAL EVIDENCE ; CAMBRIAN PALEOSOLS ; MOLECULAR FOSSILS |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS研究方向 | Geology |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/352078 |
| 作者单位 | [Retallack, G. J.] Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA |
| 推荐引用方式 GB/T 7714 | Retallack, G. J.. Paleosols and weathering leading up to Snowball Earth in central Australia[J],2021. |
| APA | Retallack, G. J..(2021).Paleosols and weathering leading up to Snowball Earth in central Australia.AUSTRALIAN JOURNAL OF EARTH SCIENCES. |
| MLA | Retallack, G. J.."Paleosols and weathering leading up to Snowball Earth in central Australia".AUSTRALIAN JOURNAL OF EARTH SCIENCES (2021). |
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