Mantle Processes and Sources of Neogene Slab Window Magmas from Southern Patagonia, Argentina |
| |
| Authors: | GORRING MATTHEW L; KAY SUZANNE M |
| |
| Institution: | DEPARTMENT OF GEOLOGICAL SCIENCES, CORNELL UNIVERSITY, ITHACA, NY 14853, USA |
| |
| Abstract: | Neogene plateau lavas in Patagonia, southern Argentina, eastof the volcanic gap between the Southern and Austral VolcanicZones at 46·5° and 49·5°S are linked withasthenospheric slab window processes associated with the collisionof a Chile Ridge segment with the Chile Trench at 12 Ma. Thestrong ocean-island basalt (OIB)-like geochemical signatures(La/Ta <20; Ba/La <20; 87Sr/86Sr = 0·7035–0·7046;143Nd/144Nd = 0·51290–0·51261; 206Pb/204Pb= 18·3–18·8; 207Pb/204Pb = 15·57–15·65;208Pb/204Pb = 38·4–38·7) of these Patagonianslab window lavas contrast with the mid-ocean ridge basalt (MORB)-like,depleted mantle signatures of slab window lavas elsewhere inthe Cordillera (e.g. Antarctic Peninsula; Baja California).The Patagonian lavas can be divided into a voluminous |
| |
| Keywords: | |
| 本文献已被 Oxford 等数据库收录！ |
|
