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• catalog abstract "The south half of the Ishpeming greenstone belt is domi- nated by a thick succession of subaqueously erupted volcanic rocks. A regional structural interpretation of the belt provides a framework for placing this succession in a stratigraphic order. The south half of the Ishpeming greenstone belt preserves the remnants of overlapping subaqueous volcanic complexes within an arc system. The Kitchi Formation, as redefined herein, comprises the lower half of the volcanic succession and is subdivided into three informal units. The basal basalt flow unit is composed of pillowed, tholeiitic, basalt flows and minor banded iron-formation and dacitic tuff. It is overlain by the second and third units, which are tuff and lahar (volcanic debris flow) units that inter- finger with one another. These units range in composition from calc-alkalic basalt to dacite. The Kitchi Formation represents an evolving tholeiitic, mafic shield to calc-alkalic, mafic to felsic subaqueous volcano. The Mona Formation, which is redefined herein, is in structural contact with the Kitchi Formation, but is likely younger. It is subdivided into three informal units. The base consists of a basalt flow unit, which is composed of pillowed, tholeiitic to magnesium-rich basalt flows and minor amounts of banded iron-formation and tuff. The basalt is overlain by a calc-alkalic dacite to rhyolite lapilli-tuff unit and a laterally continuous upper tuff unit of calc-alkalic basalt to andesite. The Mona Formation represents an evolving tholeiitic, mafic shield to mafic-felsic calc-alkalic, mafic to felsic subaqueous volcano. The Deer Lake Peridotite, an ultramafic sill complex that intrudes the Kitchi Formation, is speculatively interpreted as a subvolcanic ultramafic komatiite base of the Mona Formation.".
• catalog alternative "Ishpeming greenstone belt, Michigan.".
• catalog alternative "Volcanic rocks, south half Ispheming greenstone belt, Michigan.".
• catalog contributor b4608550.
• catalog contributor b4608551.
• catalog coverage "Kitchi Formation.".
• catalog coverage "Mona Formation.".
• catalog created "1993.".
• catalog date "1993".
• catalog date "1993.".
• catalog dateCopyrighted "1993.".
• catalog description "Includes bibliographical references (p. 13).".
• catalog description "The south half of the Ishpeming greenstone belt is domi- nated by a thick succession of subaqueously erupted volcanic rocks. A regional structural interpretation of the belt provides a framework for placing this succession in a stratigraphic order. The south half of the Ishpeming greenstone belt preserves the remnants of overlapping subaqueous volcanic complexes within an arc system. The Kitchi Formation, as redefined herein, comprises the lower half of the volcanic succession and is subdivided into three informal units. The basal basalt flow unit is composed of pillowed, tholeiitic, basalt flows and minor banded iron-formation and dacitic tuff. It is overlain by the second and third units, which are tuff and lahar (volcanic debris flow) units that inter- finger with one another. These units range in composition from calc-alkalic basalt to dacite. The Kitchi Formation represents an evolving tholeiitic, mafic shield to calc-alkalic, mafic to felsic subaqueous volcano. The Mona Formation, which is redefined herein, is in structural contact with the Kitchi Formation, but is likely younger. It is subdivided into three informal units. The base consists of a basalt flow unit, which is composed of pillowed, tholeiitic to magnesium-rich basalt flows and minor amounts of banded iron-formation and tuff. The basalt is overlain by a calc-alkalic dacite to rhyolite lapilli-tuff unit and a laterally continuous upper tuff unit of calc-alkalic basalt to andesite. The Mona Formation represents an evolving tholeiitic, mafic shield to mafic-felsic calc-alkalic, mafic to felsic subaqueous volcano. The Deer Lake Peridotite, an ultramafic sill complex that intrudes the Kitchi Formation, is speculatively interpreted as a subvolcanic ultramafic komatiite base of the Mona Formation.".
• catalog extent "iii, 13 p. :".
• catalog isPartOf "Contributions to Precambrian geology of Lake Superior region ; ch. P".
• catalog isPartOf "U.S. Geological Survey bulletin ; 1904-P".
• catalog issued "1993".
• catalog issued "1993.".
• catalog language "eng".
• catalog publisher "Washington, DC : U.S. G.P.O. ; Denver, CO : For sale by USGS Map Distribution,".
• catalog spatial "Kitchi Formation.".
• catalog spatial "Michigan.".
• catalog spatial "Mona Formation.".
• catalog subject "557.3 s 552/.2/09774 20".
• catalog subject "Geology Michigan.".
• catalog subject "Geology, Stratigraphic Archaean.".
• catalog subject "QE75 .B9 no. 1904-P QE461".
• catalog subject "Volcanic ash, tuff, etc. Michigan.".
• catalog title "Geology of volcanic rocks in the south half of the Ishpeming greenstone belt, Michigan / by Theodore J. Bornhorst and Rodney C. Johnson.".
• catalog title "Ishpeming greenstone belt, Michigan.".
• catalog title "Volcanic rocks, south half Ispheming greenstone belt, Michigan.".
• catalog type "text".