Twenty Years of XRF Core Scanning Marine Sediments: What Do Geochemical Proxies Tell Us?

Rothwell, R. G.; Croudace, Ian W.

doi:10.1007/978-94-017-9849-5_2

Cited by 138 publications

(159 citation statements)

References 289 publications

(301 reference statements)

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“…Moreover, the lack of response in Fe and a minor response in Ti during the 8.2 kyr event at Cenote Jennifer supports the notion of a concentration of Cl and Br due to higher evaporation, rather than an increase in sea level. Titanium (Ti) and Fe are common indicators of terrestrial detrital input in lake and marine sediments [ Rothwell and Croudace , ], and the increase in these elements after ~7600 cal yr B.P. is additional evidence for the connection of Cenote Jennifer to the regional aquifer, as this would have expanded the area of the catchment, delivering more Ti and Fe to the basin.…”

Section: Discussionmentioning

confidence: 99%

Multistage 8.2 kyr event revealed through high‐resolution XRF core scanning of Cuban sinkhole sediments

Peros

Collins

G'Meiner

et al. 2017

Geophysical Research Letters

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We use sediments from a flooded sinkhole (Cenote Jennifer) in northern Cuba to provide new, well‐dated, high‐resolution evidence for the 8.2 kyr event. From ~7600 to 8700 cal yr B.P. the sinkhole contained shallow, low‐salinity water, which supported a marsh dominated by cattail and grass. Peaks in Cl and Br—occurring at 8150, 8200, and 8250 cal yr B.P.—are attributable to increased evaporation due to regional drying associated with the 8.2 kyr event. The three peaks in these elements also closely correspond to the greyscale record from the Cariaco Basin, indicative of increased upwelling in the southern Caribbean Sea at this time, supporting the notion of a multistage 8.2 kyr event. Our work provides new data that help to clarify the initiation, behavior, and impacts of the 8.2 kyr event in the northern tropics.

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Section: Discussionmentioning

confidence: 99%

Multistage 8.2 kyr event revealed through high‐resolution XRF core scanning of Cuban sinkhole sediments

Peros

Collins

G'Meiner

et al. 2017

Geophysical Research Letters

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“…Crossplots of elements often associated with detrital and biogenic sources in marine sediments are shown in Figure F2 (Rothwell and Croudace, 2015). Weak positive covariance is seen for Ca and Al and for Ca and Si, with the increased amount of scatter most likely due to increased effects of water content on the low atomic mass and weakly fluorescing Al and Si atoms (Tjallingii et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…To create a high spatial resolution elemental data set to capture these changes, scanning X-ray fluorescence (XRF) analyses were performed on core sections within the stratigraphically continuous spliced composite record (see the "Site U1419" chapter [Jaeger et al, 2014b]). Elements of interest were those commonly used to identify changes in lithofacies and paleoproductivity (Rothwell and Croudace, 2015). In this report, we present the raw count data for all measured elements of interest.…”

mentioning

confidence: 99%

Data report: X-ray florescence scanning of sediment cores, Site U1419, Gulf of Alaska

Penkrot¹,

LeVay²,

Jaeger³

2017

Proceedings of the IODP

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Semiquantitative elemental results from X-ray fluorescence (XRF) scanning of sediment cores from Integrated Ocean Drilling Program (IODP) Site U1419 in the Gulf of Alaska are presented. This site contains varying lithofacies that have been previously correlated with glacial-interglacial changes in sedimentation and water-column productivity. XRF scanning was conducted to aid in interpretation of sedimentation during the last glacial period.Crossplots of elements often interpreted as detrital and biogenically sourced show positive correlations between Ca and Al, Si, Ti, Sr, and Si with Al, with no correlation between Ca and Ba. When detrital elements were compared with volume-corrected shipboard magnetic susceptibility (MS), Fe and Ti appear to positively covary, whereas Al inversely covaries. K shows a similar downhole pattern to Fe and Ti, whereas Si is similar to Al. Zr alternates between positively and negatively covarying with Fe, Ti, and K. Mn, Rh, Rb, and Pb intensities show patterns similar to K, Ti, and Fe, whereas Sr is similar to Ca and Cr is similar to Al and Si. Ni and Zn intensities are inversely related to Al, Si, and Zr. S roughly mirrors trends displayed by Ca. Mo, Nb, Y, Ga, Ge, P, Ba, Bi, As, and Cu intensities show little to no downhole variation, and changes in Br and Cl intensities are most likely related to water content. IntroductionSite U1419, drilled during Integrated Ocean Drilling Program (IODP) Expedition 341, is located on the upper continental slope in the northern Gulf of Alaska (Fig. F1) (see the "Site U1419" chapter [Jaeger et al., 2014b]). Previous results from the site reveal a high-resolution, heterolithic, deglacial-modern sedimentary record (Davies et al., 2011;Addison et al., 2012). The drilling objectives of Site U1419 were to extend this record of glacial dynamics and paleoceanography into the late Pleistocene. The primary objectives were to constrain the timing of modern to late Pleistocene glacial events of the northwestern Cordilleran ice sheet. The secondary objectives were to document the influence of North Pacific sea-surface temperatures as a control on the regional glacial dynamics and to address the dynamics of productivity and intermediate water circulation on hypoxia in the region.Previous work done at this site revealed the link between the varied sedimentary lithofacies and the water column and glacima- The periodic correspondence of the Gulf of Alaska paleoclimate with events in the North Atlantic suggests that strata accumulating at Site U1419 prior to the deglacial could contain stadial and interstadial periods with varied productivity and glacigenic sedimentation (Praetorius and Mix, 2014). Lithofacies and sediment composition are expected to follow these potential changes. To create a high spatial resolution elemental data set to capture these changes, scanning X-ray fluorescence (XRF) analyses were performed on core sections within the stratigraphically continuous spliced composite record (see the "Site U1419" chapter [Jaeger et al., 2014b]). E...

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“…). Whereas Ti and Zr generally associate with coarser silt and sand size sediment fractions, K often associates with clays (Rothwell & Croudace ). Thus, given the dissociation of K from the other terrigenic indicators, its concentrations in the sediments of San Lorenzo are probably linked to sediment grain size, with higher values of the K/Ti ratio indicating finer grains (Chawchai et al .…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the weak correlations of Rb with both K and the group formed by Fe, Zr and Ti are probably a result of the association of this element with a wide range of sediment grain sizes (Kylander et al . ; Rothwell & Croudace ).…”

Section: Discussionmentioning

confidence: 99%

Millennial‐to‐centennial scale lake system development in the mountains of tropical Mexico

Franco-Gaviria

Correa‐Metrio

Núñez‐Useche

et al. 2020

Boreas

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Rapid degradation of freshwater ecosystems threatens water supply for human populations and natural landscapes. At diverse time scales, this process has been clearly associated with climatic and anthropogenic forcings. The question remains, however, how tropical lakes have responded to these two sources of variability. We present a multiproxy record from Lake San Lorenzo, Lagunas de Montebello National Park, tropical Mexico, spanning the last ~3400 years. We used multi‐elemental concentrations, and Cladocera and pollen assemblages along the record to reconstruct regional and local environmental variability, aiming to infer the factors and processes involved in the evolution of the lacustrine system. A principal component analysis on the pooled biological and geochemical evidence allowed the inference of the main changes in lake level and productivity. At millennial scales, the development of the lake system has been closely associated with regional moisture availability, with wetter (drier) time intervals associated with high (low) lake stands. According to Ti concentrations, from ~3400 to 1000 cal. a BP, regional conditions followed a trend towards drier conditions, with littoral cladoceran assemblages suggesting high lake productivity. The extreme regional droughts reportedly associated with the cultural collapse of the Maya civilization manifested in our study area through both high lake productivity and the lowest lake levels of the record. Through the last ~800 years, the regional moisture availability has increased, with the water body becoming deeper and larger. Overall, our record offers evidence of a highly variable system strongly coupled with regional climates, but also very sensitive to local disturbances associated with human occupation. Lake San Lorenzo has been highly resilient to external pressures and has previously recovered from conditions probably alike those associated with the ongoing modern deterioration process. Nevertheless, such recovery involves a complex network of interactions amongst natural and human factors.

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Twenty Years of XRF Core Scanning Marine Sediments: What Do Geochemical Proxies Tell Us?

Cited by 138 publications

References 289 publications

Multistage 8.2 kyr event revealed through high‐resolution XRF core scanning of Cuban sinkhole sediments

Multistage 8.2 kyr event revealed through high‐resolution XRF core scanning of Cuban sinkhole sediments

Data report: X-ray florescence scanning of sediment cores, Site U1419, Gulf of Alaska

Millennial‐to‐centennial scale lake system development in the mountains of tropical Mexico

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