Clumped‐Isotope Geothermometry and Carbonate U–Pb Geochronology of the Alta Stock Metamorphic Aureole, Utah, USA: Insights on the Kinetics of Metamorphism in Carbonates

Brenner, Dana C.; Passey, Benjamin H.; Holder, Robert; Viete, Daniel R.

doi:10.1029/2020gc009238

Cited by 8 publications

(3 citation statements)

References 87 publications

(221 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, 7 out of the 10 samples that yield T (Δ 47 ) > 100°C, do not plot on this line as these are situated in a restricted field with low δ 18 O values ranging between ∼16 and 21‰ VSMOW and positive δ 13 C values varying between ∼2.5 and 1‰ VPDB. This field could be partly explained by the pattern seen in other contact metamorphic case studies, as exemplified by the dolomites from the granodioritic Alta Stock metamorphic aureole in Utah ( 71 ) (#2 in Fig. 3 B) and the calc-silicate skarn of Pine Creek, California ( 72 ) (#3 in Fig.…”

Section: Discussionmentioning

confidence: 74%

Hot carbonates deep within the Chicxulub impact structure

Kaskes,

Marchegiano,

Peral

et al. 2023

PNAS Nexus

View full text Add to dashboard Cite

Constraining the thermodynamic conditions within an impact structure during and after hypervelocity impacts is extremely challenging due to the transient thermal regimes. This work uses carbonate clumped-isotope thermometry to reconstruct absolute temperatures of impact lithologies within and close to the ∼66 Myr old Chicxulub crater (Yucatán, México). We present stable oxygen (δ18O), carbon (δ13C), and clumped-isotope (Δ47) data for carbonate-bearing impact breccias, impact melt rock, and target lithologies from four drill cores on a transect through the Chicxulub structure from the northern peak ring to the southern proximal ejecta blanket. Clumped isotope-derived temperatures (T(Δ47)) are consistently higher than maximum Late Cretaceous sea surface temperatures (35.5°C), except in the case of Paleogene limestones and melt-poor impact breccias outside of the crater, confirming the influence of burial diagenesis and a widespread and long-lived hydrothermal system. The melt-poor breccia unit outside the crater is overlain by melt-rich impact breccia yielding a much higher T(Δ47) of 111 ± 10°C (1 standard error [SE]), which likely traces the thermal processing of carbonate material during ejection. Finally, T(Δ47) up to 327 ± 33°C (1 SE) is determined for the lower suevite and impact melt rock intervals within the crater. The highest temperatures are related to distinct petrological features associated with decarbonation and rapid back-reaction, in which highly reactive CaO recombines with impact-released CO2 to form secondary CaCO3 phases. These observations have important climatic implications for the Cretaceous–Paleogene mass extinction event, as current numerical models likely overestimate the release of CO2 from the Chicxulub impact event.

show abstract

Section: Discussionmentioning

confidence: 74%

Hot carbonates deep within the Chicxulub impact structure

Kaskes,

Marchegiano,

Peral

et al. 2023

PNAS Nexus

View full text Add to dashboard Cite

show abstract

“…Understanding of the kinetics of bond reordering at elevated temperature has increased significantly through experimental and modeling studies (e.g., Passey & Henkes 2012, Stolper & Eiler 2015, Brenner et al 2018, Lloyd et al 2018, Chen et al 2019, Hemingway & Henkes 2021 and by studies in natural laboratories (e.g., Henkes et al 2014, Shenton et al 2015, Lloyd et al 2017, Brenner et al 2021. Open-source reordering and other models (e.g., Stolper et al 2018) help quantify how burial histories affect isotopic clumping (e.g., Lacroix & Niemi 2019).…”

Section: Carbonates Precipitated or Altered In The Subsurface: Constr...mentioning

confidence: 99%

Frontiers of Carbonate Clumped Isotope Thermometry

Huntington

Petersen

2023

Annual Review of Earth and Planetary Sciences

View full text Add to dashboard Cite

Carbonate minerals contain stable isotopes of carbon and oxygen with different masses whose abundances and bond arrangement are governed by thermodynamics. The clumped isotopic value Δi is a measure of the temperature-dependent preference of heavy C and O isotopes to clump, or bond with or near each other, rather than with light isotopes in the carbonate phase. Carbonate clumped isotope thermometry uses Δi values measured by mass spectrometry (Δ47, Δ48) or laser spectroscopy (Δ638) to reconstruct mineral growth temperature in surface and subsurface environments independent of parent water isotopic composition. Two decades of analytical and theoretical development have produced a mature temperature proxy that can estimate carbonate formation temperatures from 0.5 to 1,100°C, with up to 1–2°C external precision (2 standard error of the mean). Alteration of primary environmental temperatures by fluid-mediated and solid-state reactions and/or Δi values that reflect nonequilibrium isotopic fractionations reveal diagenetic history and/or mineralization processes. Carbonate clumped isotope thermometry has contributed significantly to geological and biological sciences, and it is poised to advance understanding of Earth's climate system, crustal processes, and growth environments of carbonate minerals. ▪ Clumped heavy isotopes in carbonate minerals record robust temperatures and fluid compositions of ancient Earth surface and subsurface environments. ▪ Mature analytical methods enable carbonate clumped Δ47, Δ48, and Δ638 measurements to address diverse questions in geological and biological sciences. ▪ These methods are poised to advance marine and terrestrial paleoenvironment and paleoclimate, tectonics, deformation, hydrothermal, and mineralization studies. Expected final online publication date for the Annual Review of Earth and Planetary Sciences, Volume 51 is May 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

show abstract

“…The study of naturally occurring, multiply substituted isotopologues, or "clumped isotopes", in recent years has developed into a broad field with several applications. This has led manuscript submitted to Geochemistry, Geophysics, Geosystems to a wide range of palaeothermometry studies, including paleo-climate reconstruction (Came et al, 2007;Vickers et al, 2020Vickers et al, , 2021, diagenetic and metamorphic processes (Brenner et al, 2021;Lloyd et al, 2017;Millán et al, 2016), and burial-history reconstruction of sedimentary basins and tectonics (Looser et al, 2021). Compared to classical oxygen isotope geothermometry, which requires knowledge of the oxygen isotope composition of the fluid to calculate formation temperatures, clumped isotope thermometry is independent of the fluid composition from which the carbonate precipitated (Ghosh et al, 2006;Schauble et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

New Experimental Constraints on Clumped Isotope Bond Reordering in Dolomite

Petschnig,

Looser,

Hemingway

et al. 2023

Preprint

View full text Add to dashboard Cite

The conditions controlling the formation of sedimentary dolomite are still poorly understood despite decades of research. Reconstructing formation temperatures and δ18O of fluids from which dolomite has precipitated is fundamental to constrain dolomitization models. Carbonate clumped isotopes are a very reliable technique to acquire such information if the original composition at the time of precipitation is preserved. Sedimentary dolomite first mostly forms as a poorly-ordered metastable phase (protodolomite) and subsequently transform to the more stable ordered phase. Due to this conversion its important to determine if the original clumped isotope composition of the disordered phase is preserved during diagenetic conversion to ordered dolomite, and how resistant clumped isotope signatures are against bond reordering at elevated temperatures during burial diagenesis. Here, we present a series of heating experiments at temperatures between 360 and 480 °C with durations between 0.125 and 426 hours. We uses fine-grained sedimentary dolomites to test the influence of grains size, and cation ordering on bond reordering kinetics. We analyzed a lacustrine dolomite with poor cation ordering and well ordered a replacement dolomite, both being almost stoichiometric. The poorly ordered dolomite shows a very rapid alteration of its bulk isotope composition and higher susceptibility to solid state bond reordering, whereas the well-ordered dolomite behaves like a previously studied coarse-grained hydrothermal dolomite. We derive dolomite-specific reordering kinetic parameters for ordered dolomitea and show that ∆47 reordering in dolomite is material specific. Our results call for further temperature-time series experiments to constrain dolomite ∆47 reordering over geologic timescales.

show abstract

Clumped‐Isotope Geothermometry and Carbonate U–Pb Geochronology of the Alta Stock Metamorphic Aureole, Utah, USA: Insights on the Kinetics of Metamorphism in Carbonates

Cited by 8 publications

References 87 publications

Hot carbonates deep within the Chicxulub impact structure

Hot carbonates deep within the Chicxulub impact structure

Frontiers of Carbonate Clumped Isotope Thermometry

New Experimental Constraints on Clumped Isotope Bond Reordering in Dolomite

Contact Info

Product

Resources

About