Early Proterozoic Rocks of the Great Lakes Region: Sudbury, by G. B. Morey, Ken Card, John S. Klasner, Klaus Schulz,

By G. B. Morey, Ken Card, John S. Klasner, Klaus Schulz, Richard W. Ojakangas(auth.)

About The Product

Published through the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

This guidebook used to be ready for box journey T145, "Early Proterozoic Rocks of the good Lakes Region," as a part of the twenty eighth overseas Geological Congress in Washington, D.C., July 9-19, 1989. Separate segments of the journey have been ready by means of the sector journey leaders and assembled through G.B. Morey of the Minnesota Geological Survey. The Survey, Priscilla C. Grew, Director, supplied editorial and cartographic information and undertook training of the camera-ready replica. participants from the Geological Survey of Canada, the U.S. Geological Survey, the collage of Minnesota, Duluth, and Southern Illinois collage additionally contributed their time towards the practise of this guidebook.

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Additional resources for Early Proterozoic Rocks of the Great Lakes Region: Sudbury, Ontario, Canada to Duluth, Minnesota, U.S.A, July 1-7, 1989

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In the approximate interval Volcanic Rocks. , dominantly felsic volcanic rocks formation, McAllister formation, Beecher formation, and accumulated along the southern margin of the accreted arc Pemene formation [Jenkins, 1973; see Fig. 3-2]. The terrane. This igneous activity may have accompanied Quinnesec formation is inferred to be the oldest; it consists of northward subduction and closure of an ocean basin between pillowed basalt, diabase, gabbro, serpentinite, and the accreted arc complex and a microcontinent (Marshfield plagiorhyolite.

These A-type igneous rocks are part of the Transcontinental Anorogenic Province of North America [Anderson, 1983], which extends from Labrador to California. STOP DESCRIPTIONS - DAY 5 On Day 5 we shall examine rocks south of the Niagara fault zone within the Wisconsin magmatic terrane. We will begin with the Early Proterozoic ophiolitic rocks just south of the Niagara fault zone and continue with the younger calc-alkaline volcanic-arc rocks that overlie the ophiolite. The Wisconsin magmatic terrane is interpreted as a complex island-arc terrane formed along the southern margin General Geology of the Pembine Area of the Superior craton during Early Proterozoic time.

1985] and to the south in the Athelstane Quartz Monzonite Complex. , 1985]. The Dunbar Gneiss is intruded by the Marinette Quartz Diorite, a mafic to intermediate layered intrusion; the Hoskin Lake Granite; the Spikehom Creek Granite; and the Bush Lake Granite, as well as by granitic aplite and pegmatite. The Spikehom Creek Granite is undefomled and was intruded at 1835 ± 6 Ma. Compositionally, the Dunbar Gneiss and the younger intrusive rocks are relatively potassic, calc-alkaline to alkali-calcic, high in light REB, and particularly high in Ta and Nb content.

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