| Abstract: | Volcanologic, petrologic, and paleomagnetic studies of widespread Jurassic ash-flow sheets in the Huachuca-southern Dragoon Mountains area have led to identification of four large source calderas and associated comagnetic intracaldera intrusions. Stratigraphic, facies, and contact features of the caldera-related tuffs also provide constraints on the locations, lateral displacements, and very existence for some major northwest-trending faults and inferred regional thrusts in southeastern Arizona. Silicic alkalic compositions of the Jurassic caldera-related, ash-flow tuffs; bimodal associated mafic magmatism; and interstratified coarse sedimentary deposits provide evidence for synvolcanic extension and rifting within the Cordilleran magmatic arc. Gold-copper mineralization is associated with subvolcanic intrusions at several of the Jurassic calderas. -from Authors |
| Genre: | Article |
| ProdID: | 70016729 |
| Citation Author: | Lipman, P. W.; Hagstrum, J. T. |
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| Citation End Page: | 39 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geological Society of America Bulletin |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Jurassic ash-flow sheets, calderas, and related intrusions of the Cordilleran volcanic arc in southeastern Arizona: implications for regional tectonics and ore deposits; 1992; Article; Journal; Geological Society of America Bulletin; Lipman, P. W.; Hagstrum, J. T. |
| Citation Start Page: | 32 |
| Citation Volume: | 104 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Jurassic ash-flow sheets, calderas, and related intrusions of the Cordilleran volcanic arc in southeastern Arizona: implications for regional tectonics and ore deposits; 1992; Article; Journal; Geological Society of America Bulletin; Lipman, P. W.; Hagstrum, J. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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