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Major- And Minor-Element Analysis Of Apollo 14 Volcanic Green Glasses B, And Petrogenic Modeling Of Apollo 14 Green Glasses A And B, Vera Assis Fernandes
Major- And Minor-Element Analysis Of Apollo 14 Volcanic Green Glasses B, And Petrogenic Modeling Of Apollo 14 Green Glasses A And B, Vera Assis Fernandes
Geology Theses and Dissertations
The lunar picritic volcanic glasses have been identified as being quenched samples of primary magmas extruded onto the lunar surface via fire-fountains. The study of the composition of these glasses is of extreme importance for the understanding of the Moon's mantle composition and petrogenetic processes.
Based on their chemical signature (low-Ti and high Mg#) and physical characteristics, the lunar picritic glasses are believed to represent primary magmas. Experimental data suggest that these melts formed at 360-500 km depth (18-25 kbar) in the lunar mantle, and were transported onto the lunar surface through a "channel" network (McKenzie, 1985b) that isolated these …
The Geology Of The Liberty-Orrington-Passagassawakeag/Fredericton Trough Terrane Boundary In The Bucksport-Orland Area, Coastal Maine, Heather A. Short
The Geology Of The Liberty-Orrington-Passagassawakeag/Fredericton Trough Terrane Boundary In The Bucksport-Orland Area, Coastal Maine, Heather A. Short
Geology Theses and Dissertations
The Liberty-Orrington fault separates two tectonic terranes of widely different lithologies and metamorphic grades within the Coastal Lithotectonic Belt of Maine. While the juxtaposition of the sillimanite-bearing Passagassawakeag gneiss and the chlorite grade Bucksport Formation (turbidites) requires a fault between them, field evidence for, and an understanding of, the nature of the fault has hitherto been lacking. Although the Liberty-Orrington fault has previously been interpreted as a thrust, strike-slip, and/or normal fault, the most recent debate has been centered around two models of Acadian amalgamation involving thrusting of the Passagassawakeag terrane from the southeast vs. thrusting from beneath central Maine …