scholarly journals Partial melting of phlogopite-bearing synthetic spinel- and garnet lherzolites

2019 ◽  
Keyword(s):  
Partial Melting ◽  
Garnet Lherzolites

Heterogeneity in upper-mantle lherzolites and harzburgites

1980 ◽  
Vol 297 (1431) ◽  
pp. 323-332 ◽  
Keyword(s):  
Solid Solution ◽  
Partial Melting ◽  
Upper Mantle ◽  
Garnet Lherzolite ◽  
Garnet Lherzolites ◽  
Basaltic Liquid

Harzburgite nodules from kimberlites can be subdivided into two groups on the basis of the CaO (0.24 compared with 0.96% by mass) and A1 2 O 3 (0.96 compared with 2.98% by mass) in their orthopyroxenes. Theoretically, the CaO and Al 2 O 3 from the high-Al orthopyroxenes can be quantitatively represented as garnet and clinopyroxene in solid solution, which would appear if the assemblages had been subjected to lower T or higher P . Some garnet lherzolites and orthopyroxene megacrysts from several S African localities exhibit textures indicative of exsolution of garnet and diopside from orthopyrozene during deformation and recrystallization and it is proposed that lherzolites with small amounts of garnet (less than 3 %) and diopside (less than 1 %) may have developed from an igneous harzburgite with high-Al orthopyroxene during subsolidus cooling and recrystallization. The simplest assumption in upper-mantle models, that garnet lherzolite is a relatively homogeneous rock capable of differentiation into a basaltic liquid and a ‘barren’ harzburgite residuum, must be modified to take into account different degrees of partial melting and subsequent recrystallization to metamorphic assemblages.

TIMING OF PARTIAL MELTING OF RATTLESNAKE CREEK AMPHIBOLITE—INITIATION OF THE NEVADAN OROGENY?

2019 ◽  
Author(s):  
Shane R. Dailey ◽  
◽  
Calvin G. Barnes ◽  
Susan E. Leib
Keyword(s):  
Partial Melting

INFLUENCE OF PULSED MAGMATIC ACTIVITY, LATENT HEAT, AND PARTIAL MELTING ON THE STRENGTH OF THE CONTINENTAL CRUST

2020 ◽  
Author(s):  
Aleksi Rantanen ◽  
◽  
David Whipp ◽  
Jussi S. Heinonen ◽  
Lars Kaislaniemi ◽  
...  
Keyword(s):  
Partial Melting ◽  
Continental Crust ◽  
Latent Heat ◽  
Magmatic Activity
Sign in / Sign up

Export Citation Format

Share Document