Clumped-isotope thermometry of magnesium carbonates in ultramafic rocks
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چکیده
منابع مشابه
Clumped isotope thermometry of carbonatites as an indicator of diagenetic alteration
We measure the clumped isotopic signature of carbonatites to assess the integrity of the clumped isotope paleothermometer over long timescales (10–10 years) and the susceptibility of the proxy to closed system re-equilibration of isotopes during burial diagenesis. We find pristine carbonatites that have primary oxygen isotope signatures, along with a Carrara marble standard, do not record clump...
متن کاملA process-based model for non-equilibrium clumped isotope effects in carbonates
Article history: Received 30 May 2015 Received in revised form 26 August 2015 Accepted 28 September 2015 Available online xxxx Editor: H. Stoll
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 کاملClumped isotope analysis of carbonates: comparison of two different acid digestion techniques.
RATIONALE The kinetic nature of the phosphoric acid digestion reaction enables clumped isotope analysis of carbonates using gas source isotope ratio mass spectrometry (IRMS). In most laboratories acid digestions are performed at 25°C in sealed vessels or at 90°C in a common acid bath. Here we show that different Δ47 results are obtained depending on the digestion technique employed. METHODS S...
متن کاملInfluence of climate change and uplift on Colorado Plateau paleotemperatures from carbonate clumped isotope thermometry
[1] The elevation history of Earth’s surface is key to understanding the geodynamic processes responsible for the rise of plateaus. We investigate the timing of Colorado Plateau uplift by estimating depositional temperatures of Tertiary lake sediments that blanket the plateau interior and adjacent lowlands using carbonate clumped isotope paleothermometry (a measure of the temperature‐dependent ...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2016
ISSN: 0016-7037
DOI: 10.1016/j.gca.2016.08.003