Optical dating results of beachrock, eolic dunes and sediments applied to sea-level changes study

Tatumi, Sônia Hatsue; Kowata, Emília A.; Gozzi, G.; Kassab, L.R.P.; Suguío, Kenitiro; Barreto, Alcina Magnólia Franca; Bezerra, Francisco H.R.

doi:10.1016/s0022-2313(02)00613-0

Cited by 35 publications

(23 citation statements)

References 5 publications

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“…Beachrock forms only in the intertidal zone, and is known to form relatively quickly on timescales as short as a few years (Chivas et al, 1986;Easton, 1974;Frankel, 1968;Vousdoukas et al, 2007). These spatial and temporal constraints on beachrock cementation have allowed relict beachrock to be utilized as Quaternary sea-level and shore-line indicators (Mauz et al, 2015;Ramsay and Cooper, 2002;Tatumi et al, 2003;Vousdoukas et al, 2007). Although beachrock has long been known to reduce erosion of unconsolidated beach sediments by protecting them from wave action (Calvet et al, 2003;Chowdhury et al, 1997;Dickinson, 1999;Kindler and Bain, 1993), there has been little investigation into the potential use of beachrock as a means of stabilizing beaches that are susceptible to erosion.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Building biogenic beachrock: Visualizing microbially-mediated carbonate cement precipitation using XFM and a strontium tracer

et al. 2017

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The fate of reef islands is a topic of ongoing debate in the face of climate change-induced sea-level rise and increased cyclone intensity. Increased erosion and changes to the supply of reef-derived sediment may put sand reef cays at risk of dramatic morphological changes.These changes may have negative implications for the existence of reef cay environments, which host vital sea turtle and bird rookery habitats. Beachrock, consolidated carbonate beach sediment in the intertidal zone, forms naturally on many tropical beaches and reduces the erosion rates of these beaches when compared to unconsolidated sand. In spite of the critical role beachrock plays in stabilizing some reef cay shores, the method of beachrock formation is still incompletely understood. In this investigation, beachrock was synthesized using beach sand and beachrock samples from Heron Island (Great Barrier Reef, Australia) in aquarium experiments in which natural beachrock formation conditions were simulated. Beachrock was produced in two aquaria wherein the water chemistry was influenced by microorganisms derived from the natural beachrock 'inoculum', whereas no cementation occurred in an aquarium that lacked a microbial inoculum and was controlled only by physicochemical evapoconcentration. The new cements in the synthesized beachrock were analyzed using synchrotron-based X-ray fluorescence microscopy and were identified using a Sr-tracer added to the experimental seawater. The resulting precipitates cement sand grains together and contain abundant microfossils of the microorganisms on whose exopolymer they nucleated, demonstrating the fundamental role microbes play in beachrock formation. These results are of interest because beachrock could be utilized as a natural coastline stabilization strategy on sand reef cays, and in turn, protect the unique habitats reef islands support.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Building biogenic beachrock: Visualizing microbially-mediated carbonate cement precipitation using XFM and a strontium tracer

et al. 2017

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“…Several studies have demonstrated that beachrock cementation can occur on the timescale of a few years (Frankel, 1968;Easton, 1974;Chivas et al, 1986;Vousdoukas et al, 2007). Relict beachrock has been used as an indicator of Quaternary shorelines and sea levels (Ramsay and Cooper, 2002;Tatumi et al, 2003;Vousdoukas et al, 2007;Mauz et al, 2015). The formation of beachrock greatly alters beach morphodynamics and shallow marine hydrodynamics by altering the patterns and rates of sediment deposition and erosion, as well as the focus of wave energy (Vousdoukas et al, 2007).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Beachrock formation via microbial dissolution and re-precipitation of carbonate minerals

et al. 2016

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“…A datação por termoluminescência foi realizada de acordo com o procedimento analítico citado por Tatumi et al (2003); a idade absoluta foi obtida por termoluminescência dos grãos de quartzo.…”

Section: Procedimentos De Laboratóriounclassified

Evolução quaternária, distribuição de partículas nos solos e ambientes de sedimentação em manguezais do estado de São Paulo

Souza-Júnior

Vidal‐Torrado

Tessler

et al. 2007

Rev. Bras. Ciênc. Solo

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Ferreira (6) , Xose Luiz Otero (7) & Felipe Macías (7)RESUMO A distribuição de partículas em solos ou sedimentos das planícies litorâneas auxilia no entendimento dos processos de sedimentação em estuários, servindo com importante atributo para aplicações em estudos de reconstrução paleoambiental, ciclos geoquímicos e poluição ambiental, como contaminação por metais pesados e derrames de petróleo, que, devido à ação antrópica, são relativamente comuns nesses ambientes. Com o objetivo de caracterizar os ambientes de sedimentação de acordo com a granulometria e com o processo de evolução quaternária ao longo do litoral do Estado de São Paulo, foram estudados solos de 14 manguezais. As análises granulométricas foram realizadas nas camadas de 0-20 e 60-80 cm de profundidade, determinando as frações argila, silte, areia total e cinco frações da areia. Realizaram-se datações 14 C por cintilação líquida, espectrometria de massa acoplada a acelerador de partículas na fração humina da matéria orgânica e por termoluminescência em grãos de quartzo, para amostras de diferentes camadas dos manguezais amostrados. Os resultados de

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Optical dating results of beachrock, eolic dunes and sediments applied to sea-level changes study

Cited by 35 publications

References 5 publications

Building biogenic beachrock: Visualizing microbially-mediated carbonate cement precipitation using XFM and a strontium tracer

Building biogenic beachrock: Visualizing microbially-mediated carbonate cement precipitation using XFM and a strontium tracer

Beachrock formation via microbial dissolution and re-precipitation of carbonate minerals

Evolução quaternária, distribuição de partículas nos solos e ambientes de sedimentação em manguezais do estado de São Paulo

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