Granite: A Planetary Point of View

摘要: The telluric planets and the asteroid belt display same internal structure with a metallic inner core silicate outer shell. Experimental data petrological evidence in systems show that granite can be produced through all types of magmatic processes. On Moon, 4.4-3.9 Ga clasts displaying dry mineral assemblages correspond to discrete intrusive events. Large K/Ca enrichment low REE abundances relative KREEP are consistent liquid immiscibility, process observed melt inclusions within olivine Lunar basalts. On Mars, black-and-white rhythmic layers on Tharsis rise along flanks Valles Marineris peripheral scarps Montes giant volcanoes suggest eruption possibly felsic pyroclastites. Samples analysed Mars Pathfinder landing site yield basic intermediate (45 62 wt.% SiO2) compositions. Though no granites were found so far Martian SNC meteorites, component close terrestrial continental (granitic) crust is inferred from trace element isotope systematics. Like northern hemisphere, Venus has suffered extensive volcanic resurfacing, whereas folded faulted areas resemble continents. hypothesis granitic again “tantalizing”. Finally, extra-terrestrial also as enclaves iron meteorites ordinary chondrites. Granite, major Earth's crust, generated geodynamic settings. density favours accretion. Thus, occurrence or absence associated silicic volcanism other not trivial question. Granite generally thought “wet” processes. shows conditions may apply well. In Venus, large planet high rates magma production, it speculated significant volumes develop.