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Abstract
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.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Late Paleoproterozoic to early Mesoproterozoic deposition of quartz arenites across southern Laurentia |
| DOI | 10.1130/2022.1220(12) |
| Volume | 220 |
| Year Published | 2022 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Alaska Science Center Geology Minerals |
| Description | 12 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Laurentia: Turning points in the evolution of a continent |
| Country | Canada, Mexico, United States |
| Other Geospatial | Laurentia |
| Google Analytic Metrics | Metrics page |