Sentences with phrase «rich pyroxene»

The scientists infer that late in the magma - ocean crystallization, iron - rich pyroxene and ilmenite, which formed late and at the crust - mantle boundary, might have begun to sink, and early - formed magnesium - rich olivine might have begun to rise.

Not exact matches

Humayun's team analyzed rock pieces rich in pyroxene and feldspar — minerals that would have been among the first to settle out of a cooling magma chamber.

Laboratory experiments show that under the conditions prevailing at these vents, ultramafic silicates — rocks rich in iron or magnesium, such as olivine and pyroxene — can react to produce hydrogen in a process commonly referred to as serpentinization.

The north - south variation in minerals indicates that the deep crust exposed in the southern Rheasilvia region is dominated by pyroxene - rich, diogenitic material while the equatorial region seems to retain the most ancient eucrite - rich mineralogy.

The signatures of pyroxene, an iron - and magnesium - rich mineral, in these meteorites have been found to match those of rocks observed on Vesta's surface.