Sedimentary provenance and weathering processes in the 1.1 Ga Midcontinental Rift of the Keweenaw Peninsula, Michigan, USA
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- 作者：Ria L. Mitchella ; ria.mitchell@nhm.ac.uk" class="auth_mail" title="E-mail the corresponding author ; Nathan D. Sheldonb ; nsheldon@umich.edu" class="auth_mail" title="E-mail the corresponding author
- 关键词：Weathering ; Provenance ; Mesoproterozoic ; Midcontinental Rift ; Keweenawan ; Paleoenvironment
- 刊名：Precambrian Research
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：275
- 期：Complete
- 页码：225-240
- 全文大小：7444 K
文摘
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Sedimentary deposits associated with the 1.1 Ga North American Midcontinent Rift are studied.
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Provenance indicators (Ti/Zr, La-Th-Sc) reveal both mafic and felsic sources from outside the rifted area.
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Degree of weathering (hydrolysis) and maturity increases with time and evolution of the Rift.
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The CIA and atmospheric CO2 data from paleosols reveal a similar trend through the Mesoproterozoic.
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Weathering trends of floodplain deposits reflect paleoclimatic conditions and atmospheric pO2.