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Late Paleoproterozoic to early Mesoproterozoic deposition of quartz arenites across southern Laurentia

June 24, 2022

Supermature siliciclastic sequences were deposited between 1.64 Ga and 1.59 Ga over a broad swath of southern Laurentia in the Archean, Penokean, Yavapai, and Mazatzal Provinces. These siliciclastic sequences are notable for their extreme mineralogical and chemical maturity, being devoid of detrital feldspar and ferromagnesian minerals, containing the clay mineral kaolinite (or its metamorphic equivalent, pyrophyllite), and having a chemical index of alteration >95. Such maturity is the result of a perfect confluence of tectonic and climatic conditions, including a stable continental crust with low topographic relief (the Archean, Penokean, and Yavapai Provinces ca. 1.70 Ga), a warm humid climate, an elevated level of atmospheric CO2, and relatively acidic pore fluids in the critical zone. The weathered detritus was transported and deposited by southward-flowing streams across the Archean, Penokean, and Yavapai Provinces, ultimately to be deposited on 1.66 Ga volcanic and volcaniclastic rocks in the Mazatzal continental arc along the southern margin of Laurentia.

Citation Information

Publication Year 2022
Title Late Paleoproterozoic to early Mesoproterozoic deposition of quartz arenites across southern Laurentia
DOI 10.1130/2022.1220(12)
Authors L. Gordon Medaris, Christopher G. Daniel, Michael F. Doe, James V. Jones, Joshua J. Schwartz
Publication Type Book Chapter
Publication Subtype Book Chapter
Series Title
Series Number
Index ID 70232281
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center Geology Minerals

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