Magnesium in Calcite of Marine Ostracoda

Cadot, H. M.; Schmus, W. R. Van; Kaesler, Roger L.

doi:10.1130/0016-7606(1972)83[3519:micomo]2.0.co;2

Cited by 42 publications

(34 citation statements)

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“…Corrège (1993), using atomic absorption (AA) spectrophotometry, showed a positive relationship between bottom water temperature and Mg/Ca in Krithe from the Coral Sea over water temperatures from 2 to 6 8C, generally confirming the results of Cadot and Kaesler (1977). Corrège (1993) was also able to apply his calibration to show reduced glacialage BWT at Ocean Drilling Program (ODP) Site 822 in the Pacific Ocean.…”

Section: Mg/ca Paleothermometry Using Ostracode Shellssupporting

confidence: 59%

“…Using primarily direct current plasma (DCP) emission spectrometry, they developed a provisional temperature-Mg/Ca calibration equation using modern coretop material from the Little Bahama Banks (Slowey and Curry, 1995) and elsewhere in the North Atlantic for bottom water temperatures ranging from 2 to 14 8C. They found approximately the same temperature Mg/Ca relationship as that derived by Cadot and Kaesler (1977) and by Corrège (1993) despite using Krithe from different areas and the use of different analytical techniques. Dwyer et al (1995) applied the paleotemperature equation to estimate BWTs during late Pliocene 41-ky (3.2-2.4 Ma) and Quaternary 100-ky climatic cycles (oxygen isotope stages 6-1) and found that oscillations in Mg/Ca during Pliocene and Quaternary climatic cycles correlated with oxygen isotope and faunal patterns at this site (see also Cronin and Raymo, 1997;Cronin et al, 2000).…”

Section: Mg/ca Paleothermometry Using Ostracode Shellsmentioning

confidence: 97%

“…Early studies of ostracode shell chemistry by Cadot et al (1972Cadot et al ( , 1975 and Cadot and Kaesler (1977) used the electron microprobe to investigate several genera of marine ostracodes. They reached four important conclusions.…”

Section: Mg/ca Paleothermometry Using Ostracode Shellsmentioning

confidence: 99%

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Mid-Pliocene deep-sea bottom-water temperatures based on ostracode Mg/Ca ratios

Cronin

Dowsett

Dwyer

et al. 2005

Marine Micropaleontology

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We studied magnesium:calcium (Mg/Ca) ratios in shells of the deep-sea ostracode genus Krithe from a short interval in the middle Pliocene between 3.29 and 2.97 Ma using deep-sea drilling sites in the North and South Atlantic in order to estimate bottom water temperatures (BWT) during a period of climatic warmth. Results from DSDP and ODP Sites 552A, 610A, 607, 658A, 659A, 661A and 704 for the period Ma reveal both depth and latitudinal gradients of mean Mg/Ca values. Shallower sites (552A, 610A and 607) have higher mean Mg/Ca ratios (10.3, 9.7, 10.1 mmol/mol) than deeper sites (661A, 6.3 mmol/ mol), and high latitude North Atlantic sites (552A, 610 and 607) have higher Mg/Ca ratios than low latitude (658A: 9.8 mmol/ mol, 659A: 7.7 mmol/mol, 661A: 6.3 mmol/mol) and Southern Ocean (704: 8.0 mmol/mol) sites. Converting Mg/Ca ratios into estimated temperatures using the calibration of Dwyer et al. (1995) [Dwyer, G.S., Cronin, T.M., Baker, P.A., Raymo, M.E., Buzas, J.S., Corrège, T., 1995. North Atlantic deepwater temperature change during late Pliocene and late Quaternary climatic cycles. Science 270, 1347Science 270, -1351 suggests that mean middle Pliocene bottom water temperatures at the study sites in the deep Atlantic were about the same as modern temperatures. However, brief pulses of elevated BWT occurred several times between 3.29 and 2.97 Ma in both the North and South Atlantic Ocean suggesting short-term changes in deep ocean circulation. Published by Elsevier B.V.

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Section: Mg/ca Paleothermometry Using Ostracode Shellssupporting

confidence: 59%

Section: Mg/ca Paleothermometry Using Ostracode Shellsmentioning

confidence: 97%

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Mid-Pliocene deep-sea bottom-water temperatures based on ostracode Mg/Ca ratios

Cronin

Dowsett

Dwyer

et al. 2005

Marine Micropaleontology

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“…This can be interpreted as a result of the shell mineralogy: gastropod shells are mainly made of aragonite (Moore, 1969) which changes in time into more stable calcite, while the mineral component of ostracode shells is calcite (Sohn, 1958;Cadot and Kaesler, 1977). In general, there is good correspondence between the oldest (highest) and youngest (lowest) terrace levels and their aminozones, with less clear correspondence between intermediate levels.…”

Section: Discussionmentioning

confidence: 95%

Ostracode-based aminostratigraphy and aminochronology of a tufa system in central Spain

Torres¹,

Ortíz²,

Morena³

et al. 2005

Quaternary International

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In the Priego area, central Spain, extensive tufa deposits are located in three small tributaries located at the head of the 1000 kmlong Tagus River. The deposits are originated after karst-origin running waters emerged from the confines of the canyons and expanded outward. Old tufa deposits of Priego are mainly present as terraced alluvial plain deposits where different autochthonous and allochthonous facies appear. Extraclastic deposits of quartzite and limestone clasts derived from Mesozoic rocks are interbedded with the tufa marking pulsatory high-flow periods. Using the geomorphologic analysis six terraced levels were differentiated and sampled for ostracode amino acid racemization analysis. D/L ratios of aspartic acid and glutamic acid were used for dating purposes. Cluster analysis defined six aminozones (AMI-AM7) which were dated as follows: AMI: 407 ± 12 ka oxygen isotope stages (OIS 11); AM2: 263 ± 14 ka (OIS 7e); AM3: 181 ± 17 ka (OIS 7a); AM4: 136± 13 ka (OIS 5-6); AM5: 108 ± 14 ka (OIS 5); AM7: 11 ± 4 ka (OIS 1), indicating that tufa deposition took place during warm periods. Models of riverine and riverinebarrage tufa accumulation indicate that their maximum build-up took place between the canyon mouth and the point of depletion of dissolved CO 2 , and this affected the elevation of the top of the deposits and their relative chronology.

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“…Perhaps under those circumstances, Sr may take the role of Mg in adopting a strong thermodependence. In the deep sea, where analyses have been done by Cadot (1974) and Cadot and Kaesler (1977) on several ostracod taxa (analysed under a microprobe), Corrège (1993) and De Deckker (unpubl. ) found that at a very low temperature threshold (¾1-3ºC) or above a certain temperature threshold (values differ between species), the Sr=Ca of the ostracods appears to show a linear relationship with water temperature, whereas the Mg=Ca of the ostracod does not.…”

Section: Mg Uptake By Cyprideis Australiensismentioning

confidence: 99%

Uptake of Mg and Sr in the euryhaline ostracod Cyprideis determined from in vitro experiments

Deckker

Chivas

Shelley

1999

Palaeogeography, Palaeoclimatology, Palaeoecology

124

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This paper describes a series of in vitro experiments during which juveniles of the euryhaline ostracod Cyprideis australiensis were grown to adulthood in waters of ranging salinities (from 10-70‰.) and Mg=Ca and Sr=Ca ratios, and under two different constant temperature regimes, 20º and 25ºC. This relationship for Sr, which has been mentioned for the first time for Cyprideis is tentative. The Mg=Ca of ostracods is strongly dependant on temperature, but this effect can easily be masked by variations in the Mg=Ca of the host water commonly found in natural lakes. Ostracod physiology is adapted to constructing valves from low-Mg calcite, so when growing in waters with high (>30), or very low (<1) Mg=Ca, Cyprideis species will not take up Mg in accordance with the calculated K D .

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Magnesium in Calcite of Marine Ostracoda

Cited by 42 publications

References 0 publications

Mid-Pliocene deep-sea bottom-water temperatures based on ostracode Mg/Ca ratios

Mid-Pliocene deep-sea bottom-water temperatures based on ostracode Mg/Ca ratios

Ostracode-based aminostratigraphy and aminochronology of a tufa system in central Spain

Uptake of Mg and Sr in the euryhaline ostracod Cyprideis determined from in vitro experiments

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