Environmental control of strontium and magnesium in Mytilus

<' I (0 18 ) and <' I (C13) results and isotopic temperatures are presented for transverse sections of New Zealand belemnites (Belemnopsis, Hibolithes, Dimitobelus) obtained from Jurassic strata correlated with Bajocian-Bathovian, Callovian, Kimmeridgian and Lower Tithonian, and Cretaceous strata correlated with Albian-Maastrichtian. Growth layer analyses also were carried out on 15 Jurassic and Cretaceous belemnites.Many of the belemnite specimens were found to be chemically altered to varying degrees, but growth analyses showed that the high isotopic temperatures which alter· ation is expected to produce were confined to two areas: surrounding the apical line and adjacent to the periphery of the specimen. Between these two areas there are generally plausible isotopic temperatures, and there is no reason to suspect that the temperature record has not been preserved there in its original form. Three or four major growth stages may be recognised in New Zealand belemnite guards and growth layer analyses suggest that these are annual; if this is so then in this respect the belemnites match the modern squids in having a three· or four.year life cycle. Variations in isotopic temperature of the be1mnites are comparable with those experienced seasonally by modern squids. Isotopic temperatures for the Jurassic and Cretaceous of New Zealand can be compared with sea water surface temperatures around the present day New Zealand coasts (36 0 _46 0 S. Lat.)' and inferred temperatures, based on these comparisons, are as follows: Upper Jurassic -temperatures slightly cooler than those of the present day; Albian and Cenomanian -temperatures slightly warmer; Turonian-?Coniacian -temperatures markedly warmer; Santonian-Maastrichtian -tem· peratures slightly warmer in the Santonian, but more so in the Campanian and Upper Maastrichtian. The New Zealand oxygen isotope results indicate a probable mid· latitude position, in the warm·temperate climatic zone, for New Zealand in the Jurassic and Cretaceous. New Zealand oxygen isotope results are compared with those obtained from overseas.

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“…Trace elements such as strontium may also be used to indicate salinity (cf. Dodd, 1965;Hallam and Price, 1968).…”

Section: (3) the Isotopic Composition Of The Original Sea Watermentioning

confidence: 99%

Oxygen isotope studies on Jurassic and Cretaceous belemnites from New Zealand and their biogeographic significance

Stevens

Clayton

1971

New Zealand Journal of Geology and Geophysics

126

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“…In contrast, our data show a positive correlation between gastropod Sr/Ca and temperature. Other studies of biogenic aragonite have also noted a positive relationship between Sr/Ca and temperature: the aragonitic foraminifer Hoeglundina elegans , turritellid gastropods [Tripati and Zachos, 2000], and bivalves [Dodd, 1965;Stecher et al, 1996;Takesue and van Geen, 2004;Gillikin et al, 2005]. However, there is no apparent relationship between temperature and Sr/Ca in freshwater aragonitic gastropods [Buchardt and Fritz, 1978].…”

mentioning

confidence: 92%

“…Corals and mollusks are particularly useful for isotopic and trace element studies because of their rapid skeleton accretion, which can result in a high-resolution archive of paleoenvironmental variability. Mollusks, especially bivalves, have been rigorously studied for their ability to record past temperatures, salinity, and productivity [e.g., Dodd, 1965;Jones and Quitmeyer, 1996;Elliot et al, 2003;Ivany et al, 2004]. Fewer studies, however, have investigated the isotope and trace metal composition of gastropods and their paleoenvironmental applications [e.g., Buchardt and Fritz, 1978;Rosenthal and Katz, 1989;Purton et al, 1999;Andreasson and Schmitz, 1998;Tripati and Zachos, 2002].…”

Section: Introductionmentioning

confidence: 99%

Strontium to calcium ratios in the marine gastropod Conus ermineus: Growth rate effects and temperature calibration

Sosdian

Gentry

Lear

et al. 2006

Geochem Geophys Geosyst

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[1] Here we investigate the potential of Sr/Ca ratios in the marine gastropod Conus ermineus for reconstructing seawater temperatures. We present annually resolved records of Sr/Ca and d18 O for four shells collected alive from the Flower Garden Banks National Marine Sanctuary in the Gulf of Mexico. Our results show that variations in Sr/Ca and d18 O covary with the in situ seasonal temperature cycle. Sr/ Ca and temperature are positively correlated, in contrast with the inverse relationship found in inorganically precipitated aragonite. The seasonal Sr/Ca variability is superimposed on a long-term trend of increasing Sr/Ca with age. Both the seasonal and long-term ontogenetic changes in Sr/Ca are associated with variations in growth rate, defined here as the shell linear extension rate (LER); the seasonal variability in LER is superimposed on a long-term decrease with ontogeny. Thus the covariance of Sr/Ca ratios with temperature and LER suggests that Sr incorporation is likely driven by temperature influence on growth rate, rather than by thermodynamic effects. Unlike the seasonal variability, the ontogenetic effect is characterized by inverse covariation between Sr/Ca and LER, suggesting that Sr/Ca variability is not controlled by growth rate alone, but probably by two different biomineralization mechanisms, one related to temperature and the other related to age. We use the seasonal Sr/Ca signal of four shells to construct a temperature calibration. To minimize the ontogenetic effects, we separate the records into juvenile and adult growth stages and calculate the Sr/Ca-temperature (T) relationships: Juvenile: Sr/Ca (mmol mol the seasonal estimates reflects the high variability among specimens. To reduce the uncertainty on seasonal temperatures, we propose combining records from multiple shells to generate an average temperature record. The potential of this approach needs, however, to be validated in other locations.

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“…Since 1965, trace elements in mollusc shells were investigated because bivalves form in their shells successive calcium carbonate layers, potential archives of conditions experienced by the organism during its life time (Dodd, 1965;Lorens and Bender, 1980;Klein et al, 1996aKlein et al, , 1996bStecher et al, 1996). The main aim of these studies was to use trace element records in shells as a bio indicator of environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

High frequency Barium profiles in shells of the Great Scallop <i>Pecten maximus</i>: a methodical long-term and multi-site survey in Western Europe

et al. 2009

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Environmental control of strontium and magnesium in Mytilus

Cited by 184 publications

References 9 publications

Oxygen isotope studies on Jurassic and Cretaceous belemnites from New Zealand and their biogeographic significance

Oxygen isotope studies on Jurassic and Cretaceous belemnites from New Zealand and their biogeographic significance

Strontium to calcium ratios in the marine gastropod Conus ermineus: Growth rate effects and temperature calibration

High frequency Barium profiles in shells of the Great Scallop <i>Pecten maximus</i>: a methodical long-term and multi-site survey in Western Europe

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Environmental control of strontium and magnesium in Mytilus

Cited by 184 publications

References 9 publications

Oxygen isotope studies on Jurassic and Cretaceous belemnites from New Zealand and their biogeographic significance

Oxygen isotope studies on Jurassic and Cretaceous belemnites from New Zealand and their biogeographic significance

Strontium to calcium ratios in the marine gastropod Conus ermineus: Growth rate effects and temperature calibration

High frequency Barium profiles in shells of the Great Scallop &lt;i&gt;Pecten maximus&lt;/i&gt;: a methodical long-term and multi-site survey in Western Europe

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Product

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About

High frequency Barium profiles in shells of the Great Scallop <i>Pecten maximus</i>: a methodical long-term and multi-site survey in Western Europe