The Contribution of High-resolution Magnetostratigraphic Analyses to Paleoclimatic Reconstructions

Nowaczyk, Norbert R; Frank, Ute; Mingram, Jens; Yancheva, Gergana; Liu, Jaqui; Negendank, Jörg F. W.

doi:10.1007/978-3-662-10313-5_20

Cited by 1 publication

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“…However, MS did not show any correspondence with the sediment characteristics of the E3 record, as sand beds provided either high or low MS values. It should be noted that reductive iron oxide dissolution commonly occurs in organic-rich sediments, where reducing conditions linked to the presence of organic matter result in the dissolution of magnetic particles (Canfield and Berner, 1987; Dekkers, 1997; Murdock et al, 2013; Nowaczyk et al, 2004; Ortega et al, 2006). Here, the organic content (C org ) was inversely related to the paramagnetic mineral content and may indicate reductive iron oxide dissolution processes when C org increased.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…In addition, the magnetic particle content can be later modified depending on the oxidation/reduction processes that occur after sedimentation. Therefore, MS can also be used as a proxy of the extent of reductive iron oxide dissolution processes (Canfield and Berner, 1987; Dekkers, 1997; Murdock et al, 2013; Nowaczyk et al, 2004; Ortega et al, 2006).…”

Section: Methodsmentioning

confidence: 99%

“…Thus, relative anoxic bottoms were likely to occur. Furthermore, low values of MS may indicate the input of detrital sediments into the basin and/or reductive iron oxide dissolution processes when C org increased (Canfield and Berner, 1987;Dekkers, 1997;Murdock et al, 2013;Nowaczyk et al, 2004;Ortega et al, 2006). Likewise, according to Ziegler et al (2008), bromine in sediments are exclusively linked to marine environments Mollusks, ostracoda, and foraminifera showed a high biodiversity of species, which points to euhaline conditions (marine) with an abundance of typical phytal indicators of shallow-water vegetate bottoms.…”

Section: Environmental Evolutionmentioning

confidence: 99%

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Development of the marine Holocene environment in a drowned paleovalley with final anthropic influence in the Cartagena Bay (Murcia, SE Spain)

et al. 2022

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Sedimentological, paleobiological, mineralogical, and geochemical analyses of a sediment core retrieved on the seafront of Cartagena Bay were performed after high-resolution sampling. A wide series of dates obtained through radiocarbon and amino acid racemization proved that the Holocene record on the analyzed core began at ca. 7300 yr cal BP. Reinterpretation of the marine seismic profiles indicated that the beginning of this transgression was channeled along erosive paleochannels excavated on a coastal plain of, at least, MIS5c age. The Holocene paleoenvironmental evolution consisted of a first period marked by marine conditions with strong inputs from a fan delta linked to the reorganized fluvial network that occurred after the sudden rise of the base level, which caused a growing sedimentary prism. Later, the full marine environment was reflected in the development of a Posidonia- Cymodocea meadow hosting a rich biodiversity of marine species (mollusks, foraminifera, ostracoda). Around 3800 yr cal BP, the area underwent a profound change and a silting process started to alter the conditions, turning the area into a paucispecific brackish marsh environment in which mud deposition was dominant. Since Carthaginian times, arrangement works locally affected the record, allowing the arrival of some marine species due to port work (dredging) undertaken to gain depth and showing anthropic influence.

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