Skip to Main Content
GEOREF RECORD

Clumped isotope thermometry in deeply buried sedimentary carbonates; the effects of bond reordering and recrystallization

Brock J. Shenton, Ethan L. Grossman, Benjamin H. Passey, Gregory A. Henkes, Thomas P. Becker, Juan Carlos Laya, Alberto Perez-Huerta, Stephen P. Becker and Michael Lawson
Clumped isotope thermometry in deeply buried sedimentary carbonates; the effects of bond reordering and recrystallization
Geological Society of America Bulletin (February 2015) 127 (7-8): 1036-1051

Abstract

We utilize carbonate clumped isotope thermometry to explore the diagenetic and thermal histories of exhumed brachiopods, crinoids, cements, and host rock in the Permian Palmarito Formation, Venezuela, and the Carboniferous Bird Spring Formation, Nevada, USA. Carbonate components in the Palmarito Formation, buried to approximately 4 km depth, yield statistically indistinguishable clumped isotope temperatures [T( (sub 47) )] ranging from 86 to 122 degrees C. Clumped isotope temperatures of components in the more deeply buried Bird Spring Formation (>5 km) range from approximately 100 to 165 degrees C and differ by component type, with brachiopods and pore-filling cements yielding the highest T( (sub 47) ) (mean = 153 and 141 degrees C, respectively) and crinoids and host rock yielding significantly cooler T( (sub 47) ) (mean = 103 and 114 degrees C). New high-resolution thermal histories are coupled with kinetic models to predict the extent of solid-state C-O bond reordering during burial and exhumation for both sites. Application of these models, termed "THRMs" (thermal history reordering models), suggests that brachiopods in the Palmarito Formation experienced partial bond reordering without complete equilibration of clumped isotopes at maximum burial temperature. In contrast, clumped isotope bonds of brachiopods from the Bird Spring Formation completely equilibrated at maximum burial temperature, and now reflect blocking temperatures achieved during cooling. The 40-50- degrees C-cooler clumped isotope temperatures measured in Bird Spring Formation crinoids and host rock can be explained by recrystallization and cementation during shallow burial combined with a greater inherent resistance to solid-state reordering than brachiopods


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 127
Serial Issue: 7-8
Title: Clumped isotope thermometry in deeply buried sedimentary carbonates; the effects of bond reordering and recrystallization
Affiliation: Texas A&M University, Department of Geology and Geophysics, College Station, TX, United States
Pages: 1036-1051
Published: 20150219
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 93
Accession Number: 2015-021931
Categories: Sedimentary petrologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2015081; includes appendices
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N35°00'00" - N42°00'00", W120°00'00" - W114°04'60"
N00°45'00" - N12°10'00", W73°15'00" - W59°55'00"
Secondary Affiliation: Johns Hopkins University, USA, United StatesExxonMobil Upstream Research Company, USA, United StatesUniversity of Alabama, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201511
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal