Dating the cooling of exhumed central uplifts of impact structures by the (U-Th)/He method: A case study at Manicouagan

Marc B. Biren; Matthijs Van Soest; Jo Anne Wartho; John G. Spray

doi:10.1016/j.chemgeo.2014.03.013

Dating the cooling of exhumed central uplifts of impact structures by the (U-Th)/He method: A case study at Manicouagan

Marc B. Biren, Matthijs Van Soest, Jo Anne Wartho, John G. Spray

Earth and Space Exploration, School of (SESE)

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

17 Scopus citations

Abstract

Forty titanite grain fragments from 9 central uplift samples of metamorphosed anorthosite from the Manicouagan impact structure were dated by the (U-Th)/He technique. A (U-Th)/He central age of 207.1 ± 6.4. Ma (2 standard error (SE), n = 40) has been determined. With 4 outlier ages removed the central age is refined to 208.9 ± 5.1. Ma (2 SE). Both of these ages are within error of the previously determined U-Pb zircon age of 214 ± 1. Ma (2. σ) derived from the impact melt. Manicouagan's central uplift formed due to rapid elevation from ~. 7-10. km depth as part of the modification stage of the impact process, which has facilitated the dating of its emplacement due to resulting rapid exhumation and cooling and closure of the (U-Th)/He system in titanite. Correlation with the previous U-Pb zircon 214 ± 1. Ma impact melt crystallization age indicates that the (U-Th)/He titanite dating technique offers a new approach to dating complex impact structures in the absence of viable melt sheets, or other melt products. The youngest ca. 195. Ma (U-Th)/He dates preserved in some titanite fragments are synchronous with Early Jurassic, rift-induced lithospheric thinning and associated igneous activity that defines the Central Atlantic Magmatic Province (CAMP). The (U-Th)/He titanite data from Manicouagan indicate that the influence of this regional event may extend west of the previously proposed limit of CAMP activity.

Original language	English (US)
Pages (from-to)	56-71
Number of pages	16
Journal	Chemical Geology
Volume	377
DOIs	https://doi.org/10.1016/j.chemgeo.2014.03.013
State	Published - Jun 4 2014

Keywords

Central atlantic magmatic province
Central uplift
Helium diffusion
Radiation damage
Shock metamorphism
Thermochronology

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/j.chemgeo.2014.03.013

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@article{7791f89e20594c9ebcb7fdc001ed6d38,

title = "Dating the cooling of exhumed central uplifts of impact structures by the (U-Th)/He method: A case study at Manicouagan",

abstract = "Forty titanite grain fragments from 9 central uplift samples of metamorphosed anorthosite from the Manicouagan impact structure were dated by the (U-Th)/He technique. A (U-Th)/He central age of 207.1 ± 6.4. Ma (2 standard error (SE), n = 40) has been determined. With 4 outlier ages removed the central age is refined to 208.9 ± 5.1. Ma (2 SE). Both of these ages are within error of the previously determined U-Pb zircon age of 214 ± 1. Ma (2. σ) derived from the impact melt. Manicouagan's central uplift formed due to rapid elevation from ~. 7-10. km depth as part of the modification stage of the impact process, which has facilitated the dating of its emplacement due to resulting rapid exhumation and cooling and closure of the (U-Th)/He system in titanite. Correlation with the previous U-Pb zircon 214 ± 1. Ma impact melt crystallization age indicates that the (U-Th)/He titanite dating technique offers a new approach to dating complex impact structures in the absence of viable melt sheets, or other melt products. The youngest ca. 195. Ma (U-Th)/He dates preserved in some titanite fragments are synchronous with Early Jurassic, rift-induced lithospheric thinning and associated igneous activity that defines the Central Atlantic Magmatic Province (CAMP). The (U-Th)/He titanite data from Manicouagan indicate that the influence of this regional event may extend west of the previously proposed limit of CAMP activity.",

keywords = "Central atlantic magmatic province, Central uplift, Helium diffusion, Radiation damage, Shock metamorphism, Thermochronology",

author = "Biren, {Marc B.} and {Van Soest}, Matthijs and Wartho, {Jo Anne} and Spray, {John G.}",

note = "Funding Information: The Manicouagan Impact Research Program is funded by the Canadian Space Agency (Flights for the Advancement of Science and Technology program), the Natural Sciences and Engineering Research Council of Canada (Discovery Grant 1455) and a Tier 1 Canada Research Chair , all awarded to JGS. (U–Th)/He thermochronology conducted at the NG 3 L (Arizona State University) was funded by the National Science Foundation (grant # 9048143 ) and in part by a Barringer Family Award for meteorite impact research (2010) to MBB, which is gratefully acknowledged. We thank Chris McFarlane and Yan Luo for their assistance with in situ U–Pb geochronology of titanites at the University of New Brunswick LA–ICP-MS laboratory, Suporn Boonsue for assistance with analytical field emission scanning electron microscopy and Raman spectroscopy, Lucy Thompson for constructive discussions, Karen Shea for logistical planning, and Kyle Blades, Laura Malone, Thomas Race and Catrina Russell for their assistance in the field. We thank Laurie Reisberg (editor), Peter Reiners, and an anonymous reviewer for their constructive comments that helped improve this manuscript. Planetary and Space Science Centre publication 78. ",

year = "2014",

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doi = "10.1016/j.chemgeo.2014.03.013",

language = "English (US)",

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pages = "56--71",

journal = "Chemical Geology",

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T2 - A case study at Manicouagan

AU - Biren, Marc B.

AU - Van Soest, Matthijs

AU - Wartho, Jo Anne

AU - Spray, John G.

N1 - Funding Information: The Manicouagan Impact Research Program is funded by the Canadian Space Agency (Flights for the Advancement of Science and Technology program), the Natural Sciences and Engineering Research Council of Canada (Discovery Grant 1455) and a Tier 1 Canada Research Chair , all awarded to JGS. (U–Th)/He thermochronology conducted at the NG 3 L (Arizona State University) was funded by the National Science Foundation (grant # 9048143 ) and in part by a Barringer Family Award for meteorite impact research (2010) to MBB, which is gratefully acknowledged. We thank Chris McFarlane and Yan Luo for their assistance with in situ U–Pb geochronology of titanites at the University of New Brunswick LA–ICP-MS laboratory, Suporn Boonsue for assistance with analytical field emission scanning electron microscopy and Raman spectroscopy, Lucy Thompson for constructive discussions, Karen Shea for logistical planning, and Kyle Blades, Laura Malone, Thomas Race and Catrina Russell for their assistance in the field. We thank Laurie Reisberg (editor), Peter Reiners, and an anonymous reviewer for their constructive comments that helped improve this manuscript. Planetary and Space Science Centre publication 78.

PY - 2014/6/4

Y1 - 2014/6/4

N2 - Forty titanite grain fragments from 9 central uplift samples of metamorphosed anorthosite from the Manicouagan impact structure were dated by the (U-Th)/He technique. A (U-Th)/He central age of 207.1 ± 6.4. Ma (2 standard error (SE), n = 40) has been determined. With 4 outlier ages removed the central age is refined to 208.9 ± 5.1. Ma (2 SE). Both of these ages are within error of the previously determined U-Pb zircon age of 214 ± 1. Ma (2. σ) derived from the impact melt. Manicouagan's central uplift formed due to rapid elevation from ~. 7-10. km depth as part of the modification stage of the impact process, which has facilitated the dating of its emplacement due to resulting rapid exhumation and cooling and closure of the (U-Th)/He system in titanite. Correlation with the previous U-Pb zircon 214 ± 1. Ma impact melt crystallization age indicates that the (U-Th)/He titanite dating technique offers a new approach to dating complex impact structures in the absence of viable melt sheets, or other melt products. The youngest ca. 195. Ma (U-Th)/He dates preserved in some titanite fragments are synchronous with Early Jurassic, rift-induced lithospheric thinning and associated igneous activity that defines the Central Atlantic Magmatic Province (CAMP). The (U-Th)/He titanite data from Manicouagan indicate that the influence of this regional event may extend west of the previously proposed limit of CAMP activity.

AB - Forty titanite grain fragments from 9 central uplift samples of metamorphosed anorthosite from the Manicouagan impact structure were dated by the (U-Th)/He technique. A (U-Th)/He central age of 207.1 ± 6.4. Ma (2 standard error (SE), n = 40) has been determined. With 4 outlier ages removed the central age is refined to 208.9 ± 5.1. Ma (2 SE). Both of these ages are within error of the previously determined U-Pb zircon age of 214 ± 1. Ma (2. σ) derived from the impact melt. Manicouagan's central uplift formed due to rapid elevation from ~. 7-10. km depth as part of the modification stage of the impact process, which has facilitated the dating of its emplacement due to resulting rapid exhumation and cooling and closure of the (U-Th)/He system in titanite. Correlation with the previous U-Pb zircon 214 ± 1. Ma impact melt crystallization age indicates that the (U-Th)/He titanite dating technique offers a new approach to dating complex impact structures in the absence of viable melt sheets, or other melt products. The youngest ca. 195. Ma (U-Th)/He dates preserved in some titanite fragments are synchronous with Early Jurassic, rift-induced lithospheric thinning and associated igneous activity that defines the Central Atlantic Magmatic Province (CAMP). The (U-Th)/He titanite data from Manicouagan indicate that the influence of this regional event may extend west of the previously proposed limit of CAMP activity.

KW - Central atlantic magmatic province

KW - Central uplift

KW - Helium diffusion

KW - Radiation damage

KW - Shock metamorphism

KW - Thermochronology

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DO - 10.1016/j.chemgeo.2014.03.013

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VL - 377

SP - 56

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JO - Chemical Geology

JF - Chemical Geology

ER -

Dating the cooling of exhumed central uplifts of impact structures by the (U-Th)/He method: A case study at Manicouagan

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