Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan
By: by Suzanne W. Nicholson.
Series: Contributions to the geology and mineral resources of the midcontinent rift system; U.S. Geological Survey bulletin -- 1970-B
Publisher: U.S. G.P.O.
Published: 1992
Place of publication: [Washington
Language: eng
Number of pages: 57
Subjects: Geology, Stratigraphic -- Proterozoic.; Geology -- Michigan -- Keweenaw Peninsula.; Volcanic ash, tuff, etc. -- Michigan -- Keweenaw Peninsula.; Rhyolite -- Michigan -- Keweenaw Peninsula.; Petrology -- Michigan -- Keweenaw Peninsula.; Geochemistry -- Michigan -- Keweenaw Peninsula.; Volcanism -- Michigan -- Keweenaw Peninsula.; Mineralogy -- Michigan -- Keweenaw Peninsula.; Portage Lake Volcanics (Mich.)
Description: This description of some rhyolites related to the Midcontinent rift summarizes previous work and presents new data within a newly revised tectonic framework for the rift.
Notes: Includes bibliographical references (p. 35-39).