The Finland Tectono-Magmatic Discontinuity— A Growth Fault Marking the Western Margin of the Portage Lake Volcanic Basin of the Midcontinent Rift System

1995 ◽  
pp. 35-40
Author(s):  
James D. Miller ◽  
Val W. Chandler ◽  
John C. Green ◽  
Kathleen Witthuhn
Keyword(s):  
Rift System ◽  
Midcontinent Rift ◽  
Growth Fault ◽  
Western Margin ◽  
Midcontinent Rift System

Seismic history of Minnesota and its geological significance

1981 ◽  
Vol 71 (1) ◽  
pp. 199-210 ◽  
Author(s):  
Harold M. Mooney ◽  
G. B. Morey
Keyword(s):  
Maximum Intensity ◽  
Rift System ◽  
Tectonic Zone ◽  
Midcontinent Rift ◽  
Western Margin ◽  
The North ◽  
Midcontinent Rift System ◽  
History Of ◽  
Tectonic Features ◽  
Felt Area

abstract Twelve earthquakes have been documented in Minnesota in the last 120 yr. The first nine were felt, whereas the last three (all in 1979) were detected instrumentally by a six-element seismic array which has recently been put into operation. Estimated magnitudes range from 0.1 (instrumental only) to 4.8, with four of magnitude 4.3 or greater. The highest intensity values were VI to VII. Depths where obtainable are estimated at 5 to 20 km. The best documented event occurred on 9 July 1975 near Morris, Minnesota, with a magnitude of 4.6, a maximum intensity of VI, and a felt area of 82,000 km2 covering parts of four states. The event was recorded to epicentral distances of at least 38°. The epicenters show a clear relationship to tectonic features of the state. Four epicenters lie along the newly defined Great Lakes Tectonic Zone, an east-northeast-trending belt extending across several states and into Canada. The zone separates 3,000 to 3,600 m.y. rocks of a gneissic terrane to the south from 2,700 m.y. rocks of a greenstone-granite terrane to the north. Four other events lie on known major northwest-trending faults in the greenstone-granite terrane. Two and possibly three events are associated with the western margin of the Midcontinent Rift System.

THE NORTHEAST IOWA INTRUSIVE COMPLEX: A MAJOR UNWRITTEN CHAPTER IN THE STORY OF THE MIDCONTINENT RIFT SYSTEM?

2016 ◽  
Author(s):  
Benjamin J. Drenth ◽  
◽  
Raymond R. Anderson ◽  
Klaus J. Schulz ◽  
Joshua M. Feinberg ◽  
...  
Keyword(s):  
Rift System ◽  
Intrusive Complex ◽  
Midcontinent Rift ◽  
Midcontinent Rift System

BUILDING A DIGITAL DATABASE FOR THE MIDCONTINENT RIFT SYSTEM

2016 ◽  
Author(s):  
Connie L. Dicken ◽  
◽  
Suzanne W. Nicholson
Keyword(s):  
Rift System ◽  
Midcontinent Rift ◽  
Digital Database ◽  
Midcontinent Rift System

MINERAL DEPOSITS OF THE MIDCONTINENT RIFT SYSTEM - A NEW TIME/SPACE CLASSIFICATION

2018 ◽  
Author(s):  
Laurel G. Woodruff ◽  
◽  
Suzanne W. Nicholson ◽  
Connie L. Dicken ◽  
Klaus J. Schulz
Keyword(s):  
Mineral Deposits ◽  
Rift System ◽  
Midcontinent Rift ◽  
System A ◽  
Time Space ◽  
Midcontinent Rift System ◽  
New Time

scholarly journals The Midcontinent Rift System

1985 ◽  
Vol 13 (1) ◽  
pp. 345-383 ◽  
Author(s):  
W R Van Schmus ◽  
W J Hinze
Keyword(s):  
Rift System ◽  
Midcontinent Rift ◽  
Midcontinent Rift System
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