气候变化领域集成服务门户(CCPortal): Mid-late Holocene event registered in organo-siliciclastic sediments of Lagoa Salgada carbonate system, southeast Brazil

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DOI	10.5194/cp-15-1363-2019
	Mid-late Holocene event registered in organo-siliciclastic sediments of Lagoa Salgada carbonate system, southeast Brazil
	Cruz A.P.S.; Barbosa C.F.; Blanco A.M.; De Oliveira C.A.; Silva C.G.; Seoane J.C.S.
发表日期	2019
ISSN	18149324
起始页码	1363
结束页码	1373
卷号	15 期号:4
英文摘要	The formation of the Paraíba do Sul river delta plain on the coast of Rio de Janeiro state, Brazil, gave rise to diverse lagoons formed under different sea level regimes and climate variations. Sedimentary core lithology, organic matter geochemistry, and isotopic composition (δ13C and d15N) were analyzed to interpret the sedimentation of the paleoenvironment of the Lagoa Salgada carbonate system. Different lithofacies reflect variations in the depositional environment. The abundance of silt and clay between 5.8 and 3.7 kyr enhances the interpretation of a transgressive system, which promoted the stagnation of coarse sediment deposition due to coast drowning. Geochemistry data from this period (5.8-3.7 kyr) suggest the dominance of a wet climate with an increase of C3 plants and a marked dry event between 4.2 and 3.8 kyr. This dryer event also matches with previously published records from around the world, indicating a global event at 4.2 ka. Between 3.8 and 1.5 kyr, Lagoa Salgada was isolated; sand and silt arrived at the system by erosion with the retreat of the ocean and less fluvial drainage. Geochemistry from this moment marks the changes to favorable conditions for microorganisms active in the precipitation of carbonates, forming microbial mats and stromatolites in the drier phase. © 2019 Author(s).
语种	英语
scopus关键词	geochemistry; Holocene; isotopic composition; lithofacies; microbial mat; paleoenvironment; precipitation (chemistry); sea level; sedimentation; stromatolite; Brazil; Rio de Janeiro [Brazil]; Salgada Lagoon
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153212
作者单位	Programa de Pós-Graduação em Geoquímica, Departamento de Geoquímica, Universidade Federal Fluminense, Outeiro São João Batista, Niterói, Rio de Janeiro CEP, 24.020-141, Brazil; Programa de Pós-Graduação em Dinâmica Dos Oceanos e da Terra, Departamento de Geologia, Universidade Federal Fluminense, Niterói, Rio de Janeiro, CEP, 24.210-346, Brazil; Programa de Pós-Graduação em Geologia, Departamento de Geologia, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, CEP, 21.941-916, Brazil
推荐引用方式 GB/T 7714	Cruz A.P.S.,Barbosa C.F.,Blanco A.M.,et al. Mid-late Holocene event registered in organo-siliciclastic sediments of Lagoa Salgada carbonate system, southeast Brazil[J],2019,15(4).
APA	Cruz A.P.S.,Barbosa C.F.,Blanco A.M.,De Oliveira C.A.,Silva C.G.,&Seoane J.C.S..(2019).Mid-late Holocene event registered in organo-siliciclastic sediments of Lagoa Salgada carbonate system, southeast Brazil.Climate of the Past,15(4).
MLA	Cruz A.P.S.,et al."Mid-late Holocene event registered in organo-siliciclastic sediments of Lagoa Salgada carbonate system, southeast Brazil".Climate of the Past 15.4(2019).