The clumped (13C18O) isotope composition of echinoid calcite: Further evidence for “vital effects” in the clumped isotope proxy
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چکیده
منابع مشابه
Statistical clumped isotope signatures
High precision measurements of molecules containing more than one heavy isotope may provide novel constraints on element cycles in nature. These so-called clumped isotope signatures are reported relative to the random (stochastic) distribution of heavy isotopes over all available isotopocules of a molecule, which is the conventional reference. When multiple indistinguishable atoms of the same e...
متن کاملCarbonate clumped isotope thermometry of deep-sea corals and implications for vital effects
Here we calibrate the carbonate clumped isotope thermometer in modern deep-sea corals. We examined 11 specimens of three species of deep-sea corals and one species of a surface coral spanning a total range in growth temperature of 2–25 C. External standard errors for individual measurements ranged from 0.005& to 0.011& (average: 0.0074&) which corresponds to 1–2 C. External standard errors for ...
متن کاملUse of Clumped-isotope Thermometry to Constrain the Crystallization Temperature of Diagenetic Calcite
We describe an approach to estimating the crystallization temperatures of diagenetic calcites using clumped-isotope thermometry, a paleothermometer based on the C–O-bond enrichment in carbonates. Application of this thermometer to calcified gastropod shells and calcite cements in an early Eocene limestone from the Colorado Plateau reveals a record of calcite precipitation and replacement at tem...
متن کاملThe origin of carbon isotope vital effects in coccolith calcite
Calcite microfossils are widely used to study climate and oceanography in Earth's geological past. Coccoliths, readily preserved calcite plates produced by a group of single-celled surface-ocean dwelling algae called coccolithophores, have formed a significant fraction of marine sediments since the Late Triassic. However, unlike the shells of foraminifera, their zooplankton counterparts, coccol...
متن کاملA revised calibration of the clumped isotope thermometer
Article history: Received 5 December 2012 Received in revised form 3 July 2013 Accepted 16 July 2013 Available online xxxx Editor: G. Henderson
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2019
ISSN: 0016-7037
DOI: 10.1016/j.gca.2018.07.038