Lithospheric processes
- Los Alamos National Lab., NM (United States). Earth and Environmental Sciences Div.; and others
This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The main objective was to improve understanding of the origin and evolution of the Earth`s lithosphere by studying selected processes, such as deformation and magmatic intrusion during crustal extension, formation and extraction of mantle melts, fluid transport of heat and mass, and surface processes that respond to deep-seated events. Additional objectives were to promote and develop innovative techniques and to support relevant educational endeavors. Seismic studies suggest that underplating of crust by mantle melts is an important crustal-growth mechanism, that low-angle faults can be seismogenic, and that shear deformation creates mantle anisotropy near plate boundaries. Results of geochemical work determined that magmas from oceanic intraplate islands are derived from a uniform depth in the upper mantle, whereas melts erupted at mid-ocean ridges are mixed from a range of depths. The authors have determined the extent and style of fluid infiltration and trace-element distribution in natural magmatic systems, and, finally, investigated {sup 21}Ne as a tool for dating of surficial materials.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 548614
- Report Number(s):
- LA-UR--97-3083; ON: DE98001207
- Country of Publication:
- United States
- Language:
- English
Similar Records
Lithology and evolution of the crust-mantle boundary region in the southwestern Basin and Range province
Delamination of the continental lithosphere and magmatogenesis: inferences from the Tyrrhenian area
Gradients in silicic magma chambers: Implications for lithospheric magmatism
Journal Article
·
Tue Jan 09 23:00:00 EST 1990
· Journal of Geophysical Research; (United States)
·
OSTI ID:5010211
Delamination of the continental lithosphere and magmatogenesis: inferences from the Tyrrhenian area
Conference
·
Mon Aug 01 00:00:00 EDT 1988
· AAPG Bull.; (United States)
·
OSTI ID:5839628
Gradients in silicic magma chambers: Implications for lithospheric magmatism
Journal Article
·
Mon Nov 09 23:00:00 EST 1981
· J. Geophys. Res.; (United States)
·
OSTI ID:5671995