Measurement of ancient cosmogenic 21Ne in quartz from the 28 Ma Fish Canyon Tuff, Colorado

J. C. Libarkin; J. Quade; C. G. Chase; J. Poths; W. McIntosh

doi:10.1016/S0009-2541(01)00411-9

Measurement of ancient cosmogenic ²¹Ne in quartz from the 28 Ma Fish Canyon Tuff, Colorado

J. C. Libarkin, J. Quade, C. G. Chase, J. Poths, W. McIntosh

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Measurement of ²¹Ne in quartz from the 28 Ma buried Fish Canyon Tuff of Colorado yielded a maximum of 2.75 ± 0.57 x 10⁶ ²¹Ne atoms (g SiO₂) ^-1 above nucleogenic and modern concentrations. This quantity represents cosmogenic ²¹Ne produced on the Fish Canyon Tuff surface prior to the deposition of the overlying Carpenter Ridge Tuff. Ancient ²¹Ne was isolated through the analysis and identification of (1) background ²¹Ne produced from α-particle interactions or inherited; and (2) cosmogenic ²¹Ne produced from modern radiation. Multiple samples of Fish Canyon Tuff shielded during both exposure periods, 28 Ma ago and in modern time, yielded the background that was then subtracted from all samples. Likewise, samples of Fish Canyon exposed today, but well below the Fish Canyon-Carpenter Ridge contact and therefore shielded 28 Ma ago, yielded a modern component that was also removed from all sample concentrations. The presence of an ancient cosmogenic isotope in a buried surface has several potential applications, including the quantification of paleoelevation, paleolatitude, and pre-Quaternary erosion rates.

Original language	English (US)
Pages (from-to)	199-213
Number of pages	15
Journal	Chemical Geology
Volume	186
Issue number	3-4
DOIs	https://doi.org/10.1016/S0009-2541(01)00411-9
State	Published - 2002

Keywords

Colorado
Cosmogenic isotopes
Erosion
Neon

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

Access to Document

10.1016/S0009-2541(01)00411-9

Cite this

@article{24ad145298c84bd594ffe714f113753f,

title = "Measurement of ancient cosmogenic 21Ne in quartz from the 28 Ma Fish Canyon Tuff, Colorado",

abstract = "Measurement of 21Ne in quartz from the 28 Ma buried Fish Canyon Tuff of Colorado yielded a maximum of 2.75 ± 0.57 x 106 21Ne atoms (g SiO2) -1 above nucleogenic and modern concentrations. This quantity represents cosmogenic 21Ne produced on the Fish Canyon Tuff surface prior to the deposition of the overlying Carpenter Ridge Tuff. Ancient 21Ne was isolated through the analysis and identification of (1) background 21Ne produced from α-particle interactions or inherited; and (2) cosmogenic 21Ne produced from modern radiation. Multiple samples of Fish Canyon Tuff shielded during both exposure periods, 28 Ma ago and in modern time, yielded the background that was then subtracted from all samples. Likewise, samples of Fish Canyon exposed today, but well below the Fish Canyon-Carpenter Ridge contact and therefore shielded 28 Ma ago, yielded a modern component that was also removed from all sample concentrations. The presence of an ancient cosmogenic isotope in a buried surface has several potential applications, including the quantification of paleoelevation, paleolatitude, and pre-Quaternary erosion rates.",

keywords = "Colorado, Cosmogenic isotopes, Erosion, Neon",

author = "Libarkin, {J. C.} and J. Quade and Chase, {C. G.} and J. Poths and W. McIntosh",

note = "Funding Information: We would like to thank Dr. Laurie Brown for providing the preliminary rock magnetic analyses and Dr. Peter Lipman for assistance in the field and his invaluable expertise in the San Juan Volcanics. Dr. Bill Phillips provided assistance with mass spectrometric analyses and along with Dr. Nat Lifton provided encouragement and insight during the course of this study. S. Niedermann, P. Bierman, and A. Deino offered helpful and insightful reviews. This project was funded through NASA Grant 96G1241 and a J. David Love Field Geology Fellowship from the Wyoming Geological Association. This research was part of a PhD thesis completed by Julie Libarkin at the University of Arizona. [RR] ",

year = "2002",

doi = "10.1016/S0009-2541(01)00411-9",

language = "English (US)",

volume = "186",

pages = "199--213",

journal = "Chemical Geology",

issn = "0009-2541",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Measurement of ancient cosmogenic 21Ne in quartz from the 28 Ma Fish Canyon Tuff, Colorado

AU - Libarkin, J. C.

AU - Quade, J.

AU - Chase, C. G.

AU - Poths, J.

AU - McIntosh, W.

N1 - Funding Information: We would like to thank Dr. Laurie Brown for providing the preliminary rock magnetic analyses and Dr. Peter Lipman for assistance in the field and his invaluable expertise in the San Juan Volcanics. Dr. Bill Phillips provided assistance with mass spectrometric analyses and along with Dr. Nat Lifton provided encouragement and insight during the course of this study. S. Niedermann, P. Bierman, and A. Deino offered helpful and insightful reviews. This project was funded through NASA Grant 96G1241 and a J. David Love Field Geology Fellowship from the Wyoming Geological Association. This research was part of a PhD thesis completed by Julie Libarkin at the University of Arizona. [RR]

PY - 2002

Y1 - 2002

N2 - Measurement of 21Ne in quartz from the 28 Ma buried Fish Canyon Tuff of Colorado yielded a maximum of 2.75 ± 0.57 x 106 21Ne atoms (g SiO2) -1 above nucleogenic and modern concentrations. This quantity represents cosmogenic 21Ne produced on the Fish Canyon Tuff surface prior to the deposition of the overlying Carpenter Ridge Tuff. Ancient 21Ne was isolated through the analysis and identification of (1) background 21Ne produced from α-particle interactions or inherited; and (2) cosmogenic 21Ne produced from modern radiation. Multiple samples of Fish Canyon Tuff shielded during both exposure periods, 28 Ma ago and in modern time, yielded the background that was then subtracted from all samples. Likewise, samples of Fish Canyon exposed today, but well below the Fish Canyon-Carpenter Ridge contact and therefore shielded 28 Ma ago, yielded a modern component that was also removed from all sample concentrations. The presence of an ancient cosmogenic isotope in a buried surface has several potential applications, including the quantification of paleoelevation, paleolatitude, and pre-Quaternary erosion rates.

AB - Measurement of 21Ne in quartz from the 28 Ma buried Fish Canyon Tuff of Colorado yielded a maximum of 2.75 ± 0.57 x 106 21Ne atoms (g SiO2) -1 above nucleogenic and modern concentrations. This quantity represents cosmogenic 21Ne produced on the Fish Canyon Tuff surface prior to the deposition of the overlying Carpenter Ridge Tuff. Ancient 21Ne was isolated through the analysis and identification of (1) background 21Ne produced from α-particle interactions or inherited; and (2) cosmogenic 21Ne produced from modern radiation. Multiple samples of Fish Canyon Tuff shielded during both exposure periods, 28 Ma ago and in modern time, yielded the background that was then subtracted from all samples. Likewise, samples of Fish Canyon exposed today, but well below the Fish Canyon-Carpenter Ridge contact and therefore shielded 28 Ma ago, yielded a modern component that was also removed from all sample concentrations. The presence of an ancient cosmogenic isotope in a buried surface has several potential applications, including the quantification of paleoelevation, paleolatitude, and pre-Quaternary erosion rates.

KW - Colorado

KW - Cosmogenic isotopes

KW - Erosion

KW - Neon

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