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作者:Kentaro Tanaka , Nobuyuki Okaniwa , Tsuzumi Miyaji ...
来源:[J].Chemical Geology(IF 3.154), 2019, Vol.511, pp.521-532
摘要:Abstract(#br)Since magnesium concentration (Mg/Ca) in biogenic calcite is considered to reflect water temperature during precipitation, the magnesium-to‑calcium ratio has been examined as a proxy for water temperature in paleoclimate research, although factors other than tem...
作者:Erika Vander Putten , Frank Dehairs , Luc André ...
来源:[J].Analytica Chimica Acta(IF 4.387), 1999, Vol.378 (1), pp.261-272
摘要:Abstract(#br)This study evaluates the possibilities and limitations of infrared laser ablation – inductively coupled plasma mass spectrometry, using 43 Ca as internal standard and the silicate glass reference materials NIST 610/612 as calibration standards, for quantifying the spatiotemporal variations of Mg, Mn, Sr, Ba and Pb in the calcite...
作者:Boaz Pokroy , Andrew N. Fitch , Frederic Marin ...
来源:[J].Journal of Structural Biology(IF 3.361), 2006, Vol.155 (1), pp.96-103
摘要:... The unit cell parameters a and c of biogenic calcite were found to be systematically larger than those measured in the non-biogenic calcite. The maximum lattice distortion (about 2 · 10 −3 ) was detected along the c -axis. Under heat treatment above 200 °C, a pronounce...
作者:Michael M. Reddy
来源:[J].Journal of Crystal Growth(IF 1.552), 2012, Vol.352 (1), pp.151-154
摘要:Abstract(#br)Increases in ocean surface water dissolved carbon dioxide (CO 2 ) concentrations retard biocalcification by reducing calcite supersaturation ( Ω c ). Reduced calcification rates may influence growth-rate dependent magnesium ion (Mg) incorporation into biogenic calcite...
作者:Toshihiro Yoshimura , Yusuke Tamenori , Atsushi Suzuki ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2017, Vol.202, pp.21-38
摘要:Abstract(#br)Sodium concentrations in biogenic CaCO 3 are several thousands of parts per million, and, on a molar basis, Na is among the most abundant constituent minor element in these carbonates. Nevertheless, the chemical form of Na in CaCO 3 is not well constrained. We us...
作者:D.V. Okhrimenko , K.N. Dalby , L.L. Skovbjerg ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2014, Vol.128, pp.212-224
摘要:... We investigated how two model molecules of different polarity, namely water and ethanol, interact with reservoir and outcrop chalk samples and we compared their behaviour with that of pure, inorganically precipitated calcite. Thermodynamic quantities, such as the work of we...
作者:Paul J. Angiolillo , Nora Graneto
来源:[J].Radiation Physics and Chemistry(IF 1.375), 2007, Vol.77 (5), pp.545-552
摘要:... The rostrum composed of biogenic calcite possessed inorganic radical centers CO 2 − , SO 2 − , and SO 3 − with isotropic resonances with g values of 2.0007, 2.0057, and 2.0031, respectively. SO 3 − was found to also display an axially symmetric resonance typica...
作者:Kateryna Klochko , George D. Cody , John A. Tossell ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2009, Vol.73 (7), pp.1890-1900
摘要:... In this study we revisit this assumption through a detailed solid state 11 B magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopic study of boron speciation in biogenic and hydrothermal carbonates. Our new results contrast with those of the only previou...
作者:C.J. Adams , H.J. Campbell , W.L. Griffin
来源:[J].Chemical Geology(IF 3.154), 2005, Vol.220 (1), pp.67-82
摘要:Abstract(#br)Precise LAM-MC-ICPMS in situ microanalyses of 87 Sr/ 86 Sr ratios in biogenic calcite of the bivalve ‘ Atomodesma ’ are reported for 14 horizons in low-grade metasediments of late Early Permian to late Late Permian age in South Island, New Zealand. ‘ Atomodesm...
作者:C. V. Ullmann , P. A. E. Pogge von Strandmann
来源:[J].Biogeosciences(IF 3.754), 2017, Vol.14 (1), pp.89-97
摘要:Isotopic ratios and concentrations of the alkaline earth metals Mg and Sr inbiogenic calcite are of great importance as proxies for environmentalparameters. In particular, the Mg / Ca ratio as a temperature proxy hashad considerable success. It is often hard to d...

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