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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- 作者：Marc B. Birena ; b ; Marc.Biren@asu.edu" class="auth_mail ; Matthijs van Soestb ; Jo-Anne Warthob ; John G. Spraya
- 关键词：Helium diffusion ; Thermochronology ; Radiation damage ; Shock metamorphism ; Central uplift ; Central Atlantic Magmatic Province
- 刊名：Chemical Geology
- 出版年：4 June 2014
- 年：2014
- 卷：377
- 期：Complete
- 页码：56-71
- 全文大小：2785 K
文摘
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The central uplift of the Manicouagan impact structure has been dated by (U–Th)/He
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A (U–Th)/He central age (207.1 ± 6.4 Ma, 2 standard error, n = 40) has been determined
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This age reflects the rapid uplift, cooling and closure of He in ~ 1 Gyr-old titanites
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This correlates with the previously determined U–Pb impact-melt age of 214 ± 1 Ma
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Our new approach enables dating complex impact structures that lack impact melt rocks