气候变化领域集成服务门户(CCPortal): Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.773188
	Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic
	Riedinger; Natascha; Formolo; Michael J; Lyons; Timothy W; Henkel; Susann; Beck; Antje; Kasten; Sabine
发布日期	2014-02-07
数据集类型	dataset
英文简介	Here, we present results from sediments collected in the Argentine Basin, a non-steady state depositional marine system characterized by abundant oxidized iron within methane-rich layers due to sediment reworking followed by rapid deposition. Our comprehensive inorganic data set shows that iron reduction in these sulfate and sulfide-depleted sediments is best explained by a microbially mediated process-implicating anaerobic oxidation of methane coupled to iron reduction (Fe-AOM) as the most likely major mechanism. Although important in many modern marine environments, iron-driven AOM may not consume similar amounts of methane compared with sulfate-dependent AOM. Nevertheless, it may have broad impact on the deep biosphere and dominate both iron and methane cycling in sulfate-lean marine settings. Fe-AOM might have been particularly relevant in the Archean ocean, >2.5 billion years ago, known for its production and accumulation of iron oxides (in iron formations) in a biosphere likely replete with methane but low in sulfate. Methane at that time was a critical greenhouse gas capable of sustaining a habitable climate under relatively low solar luminosity, and relationships to iron cycling may have impacted if not dominated methane loss from the biosphere.
空间范围	Median Latitude: -39.307667 * Median Longitude: -53.958104 * South-bound Latitude: -39.311667 * West-bound Longitude: -53.967167 * North-bound Latitude: -39.301000 * East-bound Longitude: -53.952667
时间范围	2009-06-01T03:12:00 - 2009-06-29T14:38:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215561
推荐引用方式 GB/T 7714	Riedinger,Natascha,Formolo,et al. Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic.2014-02-07.https://doi.org/10.1594/PANGAEA.773188.