Chemostratigraphic and U-Pb geochronologic constraints on carbon cycling across the Silurian-Devonian boundary
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- 作者：Jon M. Hussona ; b ; husson@wisc.edu" class="auth_mail" title="E-mail the corresponding author ; Blair Schoeneb ; Sarah Bluherb ; Adam C. Maloofb
- 关键词：Helderberg Group ; chemostratigraphy ; Klonk Event ; CA-ID-TIMS ; U&ndash ; Pb geochronology
- 刊名：Earth and Planetary Science Letters
- 出版年：2016
- 出版时间：15 February 2016
- 年：2016
- 卷：436
- 期：Complete
- 页码：108-120
- 全文大小：1471 K
文摘
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We document a global +5% δ13C excursion in the Silurian–Devonian Helderberg Group.
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We develop U–Pb ages on 6 Helderberg ashes via CA-ID-TIMS on volcanic zircon.
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U–Pb ages include dates on the stratigraphically lowest Devonian ashes yet developed.
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We estimate the Silurian–Devonian boundary age to be 421.3±1.2 Ma.
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A steady-state model explains the excursion if [DIC] was less than 2× modern levels.