Reproducibility of trace element profiles in a specimen of the deep-water bamboo coral Keratoisis sp.

Sinclair, D. J.; Williams, B.; Allard, G.; Ghaleb, Bassam; Fallon, Stewart; Ross, Steve W.; Risk, Michael J.

doi:10.1016/j.gca.2011.05.012

Cited by 43 publications

(51 citation statements)

References 99 publications

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“…Moreover, using the relationship between the Sr/Ca signature and the calcite-%,we calculated a 100% calcite Sr/Ca ratio end-member of ~7.96 ± 0.31 mmol/mol. This is higher than calcite corals Sr/Ca ratios (below 5 mmol/mol on average; e.g., Sinclair et al, 2011;Thresher et al, 2010) but close to the average value for diagenetic intra-skeletal calcite (Table 1, Rabier et al, 2008, fig. 8).…”

Section: Origin Of the Intra-skeletal Calcite: Biogenic Vs Early Diasupporting

confidence: 53%

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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Section: Origin Of the Intra-skeletal Calcite: Biogenic Vs Early Diasupporting

confidence: 53%

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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“…These values are in agreement with previously reported data in octocorallian corals [18,[63][64][65][66]. The Sr/Ca ratios show a varition between 2.88 and 3.18 mmol/mol for SIMS measurements and between 3.10 and 3.26 mmol/mol for bulk analyses.…”

Section: Trace Element Compositionssupporting

confidence: 93%

“…The Sr/Ca ratios show a varition between 2.88 and 3.18 mmol/mol for SIMS measurements and between 3.10 and 3.26 mmol/mol for bulk analyses. This is also in agreement with literature data [21,63,[66][67][68]. It should be noted that there is a small discrepency between SIMS and bulk Sr/Ca values.…”

Section: Trace Element Compositionssupporting

confidence: 93%

Optical Observations and Geochemical Data in Deep-Sea Hexa- and Octo-Coralla Specimens

2017

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Coral skeletons are built by Ca-carbonate (calcite or aragonite) crystals that exhibit distinct morphological patterns and specific spatial arrangements that constitute skeletal microstructures. Additionally, the long-standing recognition that distinct coral species growing in similar conditions are able to record environmental changes with species-specific responses provides convincing evidence that, beyond the thermodynamic rules for chemical precipitation, a biological influence is at work during the crystallization process. Through several series of comparative structural and geochemical (elemental and isotopic) data, this paper aims to firmly establish the specific properties of the distinct major taxonomic units that are commonly gathered as deep-water "corals" in current literature. Moreover, taking advantage of recent micrometric and infra-micrometric observations, attention is drawn to the remarkable similarity of the calcareous material observed at the nanoscale. These observations suggest a common biomineralization model in which mineralogical criteria are not the leading factors for the interpretation of the geochemical measurements.

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“…Corals are imperfect recorders of climate (e.g., Sinclair et al, 1998Sinclair et al, , 2011 and trace element profiles will therefore include some variation that is not driven by temperature. Analytical methodology will also introduce noise to any measured trace element profiles.…”

Section: Artificial Test Case and Effect Of Noisementioning

confidence: 99%

“…The amplitude of the noise was calculated by spectral analysis (Sinclair et al, 2005(Sinclair et al, , 2011) of a monthlyresolution tropical coral dataset (a Christmas Island coral analyzed for Ba/Ca by ICP-MS and Mg/Ca + Sr/Ca by ICP-OES).…”

Section: Artificial Test Case and Effect Of Noisementioning

confidence: 99%

Reproducibility of trace element profiles in a specimen of the deep-water bamboo coral Keratoisis sp.

Cited by 43 publications

References 99 publications

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

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

Optical Observations and Geochemical Data in Deep-Sea Hexa- and Octo-Coralla Specimens

RBME coral temperature reconstruction: An evaluation, modifications, and recommendations

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