气候变化领域集成服务门户(CCPortal): Geochemical data and luminescence ages from riverbed, downcore, and suspended sediment samples from the Xingu, Tapajós and Amazon Rivers

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.893251
	Geochemical data and luminescence ages from riverbed, downcore, and suspended sediment samples from the Xingu, Tapajós and Amazon Rivers
	Bertassoli Junior; Dailson José; Sawakuchi; André Oliveira; Sawakuchi; Henrique O; Pupim; Fabiano Nascimento; Hartmann; Gelvam André; McGlue; Michael M; Chiessi; Cristiano Mazur; Zabel; Matthias; Schefuß; Enno; Pereira; Tatiana S; Faustino; Samantha B; Oliveira; Paulo Eugenio; Bicudo; Denise C
发布日期	2018-08-24
数据集类型	dataset
英文简介	In this study, we analyzed the organic and inorganic geochemistry and magnetic susceptibility of sediments (suspended, riverbed, and downcore) from the Amazon, Xingu, and Tapajós Rivers to investigate the effects of hydrologic variations on the carbon budget of amazonian clearwater rivers over the Holocene. Ages of sediment deposition (∼100 to 5,500 years) were constrained by optically stimulated luminescence. Major elements concentrations were measured using an inductively coupled plasma-optical emission spectrometer (ICP-OES) for suspended sediments and an energy dispersive x-ray fluorescence (XRF) spectrometer for riverbed and downcore sediment samples. TOC values in sediment cores are similar to values measured in riverbed sediments and indicate suitable conditions for organic matter preservation in sediments of the Xingu and Tapajós rias at least since the mid-Holocene, with carbon burial rates varying from about 84g m−2 yr−1 to 169 g m−2 yr−1. Redox-sensitive elements in the sediment core indicate alternation between anoxic/dysoxic and oxic conditions in the water-sediment interface that may be linked to abrupt changes in precipitation. Changes promoted by hydrological variations significantly affect the capacity of amazonian rias to act either as sources or sinks of carbon.
空间范围	Median Latitude: -2.457531 * Median Longitude: -52.436918 * South-bound Latitude: -3.885000 * West-bound Longitude: -55.511000 * North-bound Latitude: -1.444000 * East-bound Longitude: -51.691000
时间范围	2011-09-01T00:00:00 - 2014-11-01T00:00:00
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/215217
推荐引用方式 GB/T 7714	Bertassoli Junior,Dailson José,Sawakuchi,et al. Geochemical data and luminescence ages from riverbed, downcore, and suspended sediment samples from the Xingu, Tapajós and Amazon Rivers.2018-08-24.https://doi.org/10.1594/PANGAEA.893251.