|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Seismological Laboratory
Caltech
Pasadena, CA 91125, USA
E-mail:
dla{at}gps.caltech.edu
When continental crust gets too thick, the dense eclogitic bottom detaches, causing uplift, asthenospheric upwelling, and pressure-release melting. Delamination introduces warm blocks of lower crust with a low melting point into the mantle; these eventually heat up, ascend, decompress, and melt. The mantle below 100 km depth is mainly below the melting point of dry peridotite, but its temperature will be above the melting point of recycled fertile (basaltic or eclogitic) components, obviating the need for excess temperature to form "hotspots" or "melting anomalies". When plates pull apart or delaminate, the mantle upwells; entrained crustal fragments of various ages are fertile and create melting anomalies along developing mid-ocean ridges, fracture zones, and old suture zones. Eclogites associated with delamination are warmer and less dense than subducted oceanic crust and more susceptible to melting and entrainment.
KEYWORDS: LIPs, delamination, plumes, hotspots, lithosphere, eclogite
This article has been cited by other articles:
|
|
 |
|
  O. H. Gogus and R. N. Pysklywec Mantle lithosphere delamination driving plateau uplift and synconvergent extension in eastern Anatolia Geology, September 1, 2008; 36(9): 723 - 726. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 V. E. Camp and B. B. Hanan A plume-triggered delamination origin for the Columbia River Basalt Group Geosphere, June 1, 2008; 4(3): 480 - 495. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. B. Hamilton Earth's first two billion years--The era of internally mobile crust Geological Society of America Memoirs, January 1, 2007; 200(0): 233 - 296. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 G. R. Foulger The "plate" model for the genesis of melting anomalies Geological Society of America Special Papers, January 1, 2007; 430(0): 1 - 28. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. L. Anderson The eclogite engine: Chemical geodynamics as a Galileo thermometer Geological Society of America Special Papers, January 1, 2007; 430(0): 47 - 64. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. H. Natland {Delta}Nb and the role of magma mixing at the East Pacific Rise and Iceland Geological Society of America Special Papers, January 1, 2007; 430(0): 413 - 449. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. D. Smith A plate model for Jurassic to Recent intraplate volcanism in the Pacific Ocean basin Geological Society of America Special Papers, January 1, 2007; 430(0): 471 - 495. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. R. Hooper, V. E. Camp, S. P. Reidel, and M. E. Ross The origin of the Columbia River flood basalt province: Plume versus nonplume models Geological Society of America Special Papers, January 1, 2007; 430(0): 635 - 668. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. V. Ivanov Evaluation of different models for the origin of the Siberian Traps Geological Society of America Special Papers, January 1, 2007; 430(0): 669 - 691. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T. FURMAN, K. M. KALETA, J. G. BRYCE, and B. B. HANAN Tertiary Mafic Lavas of Turkana, Kenya: Constraints on East African Plume Structure and the Occurrence of High-{micro} Volcanism in Africa J. Petrology, June 1, 2006; 47(6): 1221 - 1244. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
