| Abstract: | A composite ring-structure caldera of Late Pleistocene age, 26 X 14km in size, has been discovered and mapped near the Andean crest in central Chile (35o 30‘S). Rhyolitic to dacitic zoned ashflow sheets, each representing 150-300 km3 of magma, were erupted 0.8, 0.3 and 0.15 m.y. ago; the youngest of the associated collapses was closely followed by resurgent doming of the caldera floor and the development of a longitudinal graben. Post-caldera eruption of dacite and andesite have persisted into Holocene time and active hot springs are abundant along caldera-marginal and resurgent fault systems, suggesting a significant geothermal energy resource. The ash-flow magmatism has been no less important in this segment of the glaciated S Andes than in the arid central Andes and may well be accounted for by the existence of thicker crust in both regions.- L.H. |
| Genre: | Article |
| ProdID: | 70013362 |
| Citation Author: | Hildreth, W.; Grunder, A. L.; Drake, R. E. |
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| Citation End Page: | 54 |
| 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: | 10 |
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| Citation Search Results Text: | The Loma Seca tuff and the Calabozos caldera: a major ash-flow and caldera complex in the southern Andes of central Chile.; 1984; Article; Journal; Geological Society of America Bulletin; Hildreth, W.; Grunder, A. L.; Drake, R. E. |
| Citation Start Page: | 45 |
| Citation Volume: | 95 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | The Loma Seca tuff and the Calabozos caldera: a major ash-flow and caldera complex in the southern Andes of central Chile.; 1984; Article; Journal; Geological Society of America Bulletin; Hildreth, W.; Grunder, A. L.; Drake, R. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
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