Terrestrial rock

From Lherz, type locatity

(Pyrénées mountains, Fance)

Terestrial analog to the 11 martian lherzolite meteorites



There is only 11 lherzolitic martian meteorites (include 8 found in Antarctic) for a circa 60 known at this time...

Lherzolite is a type of ultramafic igneous rock. It is a coarse grained rock consisting of 40 to 90% olivine along with significant orthopyroxene and lesser calcic chromium rich clinopyroxene. Minor minerals include chromium and aluminium spinels and garnets. Plagioclase can occur in lherzolites and other peridotites that crystallize at relatively shallow depths (20 - 30 km). At greater depth plagioclase is unstable and is replaced by spinel. At approximately 90 km depth, pyrope garnet becomes the stable aluminous phase. Garnet lherzolite is a major constituent of the Earth's upper mantle (extending to ~300 km depth). Lherzolite is known from the lower ultramafic part of ophiolite complexes (although harzburgite is more common in this setting), from alpine-type peridotite massifs, from fracture zones adjacent to mid-oceanic ridges, and as xenoliths in kimberlite pipes and alkali basalts. Partial melting of spinel lherzolite is one of the primary sources of basaltic magma.

The name is derived from the Lherz Massif, an alpine peridotite complex (also known as orogenic lherzolite complex), (the type locality) at Etang de Lers, near Massat in the French Pyrenees; Lherz is the archaic spelling of this location.

The Lherz massif also contains harzburgite and dunite (chassignites analog), as well as layers of spinel pyroxenite, garnet pyroxenite, and hornblendite. The layers represent partial melts extracted from the host peridotite during decompression in the mantle long before emplacement into the crust.

The Lherz massif is unique because it has been emplaced into Paleozoic carbonates (limestones and dolostones), which form mixed breccias of limestone-lherzolite around the margins of the massif.




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