Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1813493115 |
Oxygenated Mesoproterozoic lake revealed through magnetic mineralogy | |
Slotznick, Sarah P.1; Swanson-Hysell, Nicholas L.1; Sperling, Erik A.2 | |
2018-12-18 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:51页码:12938-12943 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Terrestrial environments have been suggested as an oxic haven for eukaryotic life and diversification during portions of the Proterozoic Eon when the ocean was dominantly anoxic. However, iron speciation and Fe/Al data from the ca. 1.1-billion-year-old Nonesuch Formation, deposited in a large lake and bearing a diverse assemblage of early eukaryotes, are interpreted to indicate persistently anoxic conditions. To shed light on these distinct hypotheses, we analyzed two drill cores spanning the transgression into the lake and its subsequent shallowing. While the proportion of highly reactive to total iron (FeHR/FeT) is consistent through the sediments and typically in the range taken to be equivocal between anoxic and oxic conditions, magnetic experiments and petrographic data reveal that iron exists in three distinct mineral assemblages resulting from an oxycline. In the deepest waters, reductive dissolution of iron oxides records an anoxic environment. However, the remainder of the sedimentary succession has iron oxide assemblages indicative of an oxygenated environment. At intermediate water depths, a mixed-phase facies with hematite and magnetite indicates low oxygen conditions. In the shallowest waters of the lake, nearly every iron oxide has been oxidized to its most oxidized form, hematite. Combining magnetics and textural analyses results in a more nuanced understanding of ambiguous geochemical signals and indicates that for much of its temporal duration, and throughout much of its water column, there was oxygen in the waters of Paleolake Nonesuch. |
英文关键词 | Proterozoic oxygen iron speciation lacustrine environments eukaryotic evolution |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453529800048 |
WOS关键词 | PRECAMBRIAN NONESUCH FORMATION ; AMERICAN MIDCONTINENT RIFT ; TERRESTRIAL ENVIRONMENT ; ORGANIC-MATTER ; IRON ; SULFUR ; REDOX ; SEDIMENTOLOGY ; HYSTERESIS ; COERCIVITY |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205032 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 2.Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA |
推荐引用方式 GB/T 7714 | Slotznick, Sarah P.,Swanson-Hysell, Nicholas L.,Sperling, Erik A.. Oxygenated Mesoproterozoic lake revealed through magnetic mineralogy[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(51):12938-12943. |
APA | Slotznick, Sarah P.,Swanson-Hysell, Nicholas L.,&Sperling, Erik A..(2018).Oxygenated Mesoproterozoic lake revealed through magnetic mineralogy.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(51),12938-12943. |
MLA | Slotznick, Sarah P.,et al."Oxygenated Mesoproterozoic lake revealed through magnetic mineralogy".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.51(2018):12938-12943. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论