Diagenesis of fossil coral skeletons: Correlation between trace elements, textures, and

Bar‐Matthews, M.; Wasserburg, G. J.; Chen, J.H

doi:10.1016/0016-7037(93)90429-z

Cited by 94 publications

(45 citation statements)

References 32 publications

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“…The slab was ultrasonically cleaned in distilled/ deionized water (DDW) and dried, then X-rayed. The Xradiography revealed coral skeletal growth patterns and Element/Ca ratio General range (mmol/mol) References Na/Ca 15−24 Amiel et al (1973), Land and Hoops (1973), Polyakov and Krasnov (1976), Swart (1981), Oomori et al (1982), Busenberg and Plummer (1985), Kitano (1990), Bar-Matthews et al (1993), Tsukamoto and Tsukamoto (1995), Mitsuguchi et al (2001), Ramos et al (2004) Sr/Ca 8.0−10.0 Weber (1973), Polyakov and Krasnov (1976), Goreau (1977), Smith et al (1979), Oomori et al (1982), Schneider and Smith (1982), Beck et al (1992), de Villiers et al (1994, Fallon et al (1999Fallon et al ( , 2003, Gagan et al S/Ca 4.0−10.0 Tokuyama et al (1972), Oomori et al (1982), Busenberg and Plummer (1985), Kitano (1990), Bar-Matthews et al (1993), Tsukamoto and Tsukamoto (1995) F/Ca 3.0−7.0 Carpenter (1969), Ohde et al (1978), Ohde and Ramos (2004), Ramos et al (2005) Mg/Ca 2.5−6.5 Chave (1954), Weber (1974), Goreau (1977), Oomori et al (1982), Mitsuguchi et al (1996Mitsuguchi et al ( , 2001Mitsuguchi et al ( , 2003Mitsuguchi et al ( , 2008, Sinclair et al (1998), Fallon et ...…”

Section: Methodsmentioning

confidence: 99%

Na/Ca variability in coral skeletons

2010

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Section: Methodsmentioning

confidence: 99%

Na/Ca variability in coral skeletons

2010

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“…This may explain the slightly lower δ 234 U initial values of these 2 corals with respect to those of the other corals, although the difference is not significant at the 95% confidence level (Table 1). However, this represents a very extreme case, and in the marine environment, the diagenetic changes in corals with recrystallization and secondary aragonite or Mg-calcite precipitation within seawater are usually related to increasing δ 234 U initial values (Bar-Matthews et al 1993). …”

Section: Comparison Of the Marine Reservoir R Ages From The Tahiti Anmentioning

confidence: 99%

Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

et al. 2004

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ABSTRACT. Paired radiocarbon and 230 Th/U dating was performed on 13 surface corals from submerged reefs in the Marquesas and from raised terraces in Vanuatu. The absolute ages of the corals analyzed ranged from 3000 to 15,000 cal yr. Estimates of the difference between the absolute and 14 C ages of these corals are in agreement with previous determinations up until 11,500 cal yr. The resulting mean sea surface reservoir age R is determined at 390 ± 60 yr for the Marquesas region (9°S), which is slightly higher than the R value at 280 ± 50 yr for the Tahiti Islands (18°S). Multiple 14 C analyses of 2 corals from the Marquesas present scattered 14 C ages at ~12,000 and ~15,100 cal yr. This could be attributed to rapid changes of the 14 C content of surface waters around the Marquesas Islands or to a subtle submarine diagenesis.

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“…The impacts of diagenesis on the coral skeleton geochemistry have been investigated in several studies (e.g., Allison et al, 2007;Bar-Matthews et al, 1993;Houk et al, 1975;Lazareth et al, 2013;Nothdurft and Webb, 2009). Nevertheless, the impacts of some specific diagenesis on the skeleton's geochemistryare poorly known.…”

Section: Introductionmentioning

confidence: 99%

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

Lazareth

Soares-Pereira

Douville

et al. 2016

Geochimica et Cosmochimica Acta

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Geochemical proxies measured in the carbonate skeleton of tropical coral Porites sp. have commonly been used to reconstruct sea surface temperature (SST) and more recently seawater pH. Nevertheless, both reconstructed SST and pH depend on the preservation state of the skeleton, here made of aragonite; i.e., diagenetic processes and its related effects should be limited. In this study, we report on the impact of the presence of intra-skeletal calcite on the skeleton geochemistry of a live-collected Porites sp..The Porites skeleton preservation state was analyzed using X-ray diffraction and scanning electron microscopy. Sr/Ca, Mg/Ca, U/Ca, Ba/Ca, Li/Mg, and B/Ca ratios were measured at a monthly and yearly resolution using solution ICP-MS and multi-collector ICP-MS. Theδ 11 B signatures and the calcite percentages were acquired at a yearly timescale. The coral colony presents two parts, one with less than 3% calcite (referred to as "no-calcite" skeleton), the other one, corresponding to the skeleton formed during the last 4 yrs. of growth,with calcite percentages varying from 13 to 32% (referred to as "with calcite" skeleton). This intra-skeletal calcite replaces partly or completely numerouscenter of calcification (COCs). All geochemical tracers investigated are significantlyimpacted by the presence of calcite. Thereconstructed SSTdecreasesby about0.1°C per calcite-percent as inferred fromthe Sr/Ca ratio. Such impact reaches up to 0.26°C per calcite-percent for temperature deduced from the Li/Mg ratio. So, less than 5% of such intra-skeletal calcite does not prevent SST reconstructions using Sr/Ca ratio, but the percentage and type of calcite have to be determined before fine SST interpretation. Seawater pH reconstruction inferredfrom boron isotopes drop by about -0.011 pH-unit per calcitepercent. Such sensitivity to calcite presence is particularly dramatic for fine paleo-pH reconstructions. Here we suggest that after being brought to shallow waters following a cyclone, the studied coral was seasonally subjected to rainfall-related water freshening that could have mimicked a vadose environment like can be encountered on raised fossil coral reefs. Nevertheless, the process of calcite precipitation remains to be determined.

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Diagenesis of fossil coral skeletons: Correlation between trace elements, textures, and

Cited by 94 publications

References 32 publications

Na/Ca variability in coral skeletons

Na/Ca variability in coral skeletons

Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

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Diagenesis of fossil coral skeletons: Correlation between trace elements, textures, and

Cited by 94 publications

References 32 publications

Na/Ca variability in coral skeletons

Na/Ca variability in coral skeletons

Paired 14C and 230Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval

Intra-skeletal calcite in a live-collected Porites sp.: Impact on environmental proxies and potential formation process

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Paired ¹⁴C and ²³⁰Th/U Dating of Surface Corals from the Marquesas and Vanuatu (Sub-Equatorial Pacific) in the 3000 to 15,000 Cal Yr Interval