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U.S. Geological Survey Bulletin
A reconnaissance study carried out in conjunction with regional geologic mapping.
U.S. Geological Survey Bulletin
Modal, chemical, and isotopic data for the granitic rocks of the Tuolumne Meadows quadrangle.
U.S. Geological Survey Bulletin
The Early Proterozoic Michigamme Formation of northern Michigan was deposited in the southeastern part of the Animikie basin. The formation conformably overlies the Goodrich Quartzite and comprises three widespread members a lower member of thin-bedded shale, siltstone, and sandstone; the Bijiki Iron-formation Member; and an upper member of tur- biditic graywacke, siltstone, and mudstone and a few local members. The Goodrich Quartzite is interpreted as having been deposited in a tidally influenced shallow marine environ- ment. The lower member of the Michigamme is interpreted as having been deposited in a tidally influenced environment, the iron-formation member as having been deposited belo...
Thick-skinned, South-verging Backthrusting in the Felch and Calumet Troughs Area of the Penokean Orogen, Northern Michigan
The Felch and Calumet troughs area of northern Michigan is part of the Penokean fold-thrust belt of the continental foreland of the Superior craton. The area lies immediately north of the Niagara fault zone, the north-verging suture between the continental foreland and the Early Proterozoic Wisconsin magmatic terranes to the south. Accretion of the magmatic terranes to the continental margin approximately equals 1,850 Ma produced south-verging backthrusting and backfolding in this region involving both Archean basement and Early Proterozoic supracrustal strata. Evidence for backthrusting exists throughoutthe Felch and Calumet troughs area. The backthrusting is characterized by southward-over...
The Midcontinent of the United States--permissive Terrane for an Olympic-Dam Type Deposit
Midcontinent strategic and critical minerals project 1988 workshop report.
Petrography and Geochemistry of Early Proterozoic Granitoid Rocks in Wisconsin Magmatic Terranes of Penokean Orogen, Northern Wisconsin
A reconnaissance study carried out in conjunction with regional geologic mapping.
Geology and Geochemistry of Early Proterozoic Rocks in the Dunbar Area, Northeastern Wisconsin
Field relations, lithology, isotope ages, and tectonic implications of volcanic and granitoid rocks.
