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Tilting history of the San Manuel-Kalamazoo porphyry system, southeastern Arizona

Economic Geology

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Abstract

The Laramide San Manuel-Kalamazoo porphyry system of Arizona has been pivotal in concepts of both extensional tectonics and alteration-mineralization zoning. This paper reexamines the tilting history in light of new work in the region and reinterprets the geometry of the deposit. The porphyry mineralization occurs in and near an intrusion of Laramide San Manuel porphyry in Precambrian Oracle Granite. The area has an extremely complicated history of Tertiary crustal extension and fanglomerate deposition, but the blocks containing the two main fragments of the original orebody were involved in only the later parts of this history and are less tilted than other nearby blocks. Originally horizontal features of mid-Tertiary age are tilted about 30??, those of Laramide age about 35??, and those of pre-Laramide age about 45?? to the northeast. Paleomagnetism of the porphyry intrusion itself suggests tilting of about 33??. The data thus suggest that postemplacement tilt of the Laramide porphyry system was 30?? to 35?? and that virtually all of it was mid-Tertiary in age. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tilting history of the San Manuel-Kalamazoo porphyry system, southeastern Arizona
Series title:
Economic Geology
Volume
90
Issue:
1
Year Published:
1995
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Economic Geology
First page:
67
Last page:
80