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Ultramafic mantle rock
Harzburgite
Igneous rock
Harzburgite from a small intrusion 35 km south of Ambositra, Madagascar
Composition
Mostly olivine and low-calcium (CA) pyroxene
Harzburgite, an ultramafic, igneous rock, is a variety of peridotite consisting mostly of the two minerals olivine and low-calcium (Ca) pyroxene (enstatite); it is named for occurrences in the Harz Mountains of Germany. It commonly contains a few percent chromium-rich spinel as an accessory mineral. Garnet-bearing harzburgite is much less common, found most commonly as xenoliths in kimberlite.
Harzburgite typically forms by the extraction of partial melts from the more pyroxene-rich peridotite called lherzolite. The molten magma extracted from harzburgite may then erupt on the surface as basalt. If partial melting of the harzburgite continues, all of the pyroxene may be extracted from it to form magma, leaving behind the pyroxene-poor peridotite called dunite. Harzburgite may also form by the accumulation of olivine and low-Ca pyroxene in large magma chambers of basalt deep in continental crust (layered intrusions).
Harzburgite, an ultramafic, igneous rock, is a variety of peridotite consisting mostly of the two minerals olivine and low-calcium (Ca) pyroxene (enstatite);...
From 40% to 90% olivine and less than 5% hornblende Harzburgite: less than 5% clinopyroxene Harzburgite makes up the bulk of the peridotite layer of ophiolites...
first proposed by Ted Ringwood (1962) as being 1 part basalt and 4 parts harzburgite, but later was revised to being 1 part tholeiitic basalt and 3 parts...
known from the lower ultramafic part of ophiolite complexes (although harzburgite is more common in this setting), from alpine-type peridotite massifs...
formation in mantle sections is by interaction between lherzolite or harzburgite and percolating silicate melts, which dissolve orthopyroxene from the...
contains quartz and alkali feldspar in characteristic angular intergrowths Harzburgite – Ultramafic mantle rock Hornblendite – Plutonic rock consisting mainly...
thick. Lithologies vary from largely ultramafic peridotite, chromitite, harzburgite, and bronzitite in the lower sections to mafic norite, anorthosite, and...
a chemical discontinuity between ultramafic cumulates and tectonized harzburgites, which has been observed from deep parts of the oceanic crust that have...
ferromagnesian minerals in mafic and ultramafic rocks, such as dunite, harzburgite, or lherzolite. These are rocks low in silica and composed mostly of...
peridotite nodules are pieces of mantle rock modified by partial melting. Harzburgite peridotites represent the crystalline residues after extraction of melts...
kimberlite eruption samples them. Host rocks in a mantle keel include harzburgite and lherzolite, two type of peridotite. The most dominant rock type in...
(2010). "Diogenites as polymict breccias composed of orthopyroxenite and harzburgite". Meteoritics and Planetary Science. 45 (5): 850–872. Bibcode:2010M&PS...
(2010). "Diogenites as polymict breccias composed of orthopyroxenite and harzburgite". Meteoritics and Planetary Science. 45 (5): 850–872. Bibcode:2010M&PS...
inclusions in diamond contain less Cr2O3 whereas peridotite (lherzolite and harzburgite) garnet inclusions have less CaO. Eclogite and peridotite are the two...
and occasionally melilite and sodalite. The rocks contain xenoliths of harzburgite, lherzolite and peridotite. Sulfur occurs within the crater of the scoria...
structures Serpentinite with relict mineral structures suggesting parental harzburgite (described as massive, homogeneous with thin dunite layers) Underlying...
; Farley K. A.; Turner G. (1998). "Multiple fluid pulses in a Samoan harzburgite". Chemical Geology. 147 (1–2): 99–114. Bibcode:1998ChGeo.147...99B. doi:10...
minerals that settled out from a magma chamber. Tectonized peridotite: harzburgite/lherzolite-rich mantle rock. A Geological Society of America Penrose...
Washington Park, west of Anacortes, Washington, and consists of serpentinized harzburgite and dunite with crosscutting veins of pyroxenite. Intrusive rocks of...
schist formed in the Triassic in a volcano-sedimentary basin. Brezovica harzburgite. Wikimedia Commons has media related to Geology of Kosovo. Moores, E...
ophiolite, in the south and center of Northern Cyprus. Lower units include harzburgite interpreted as deformed mantle, overlain by massive gabbro, with dunite...
the overriding Philippine plate. The Mariana fore-arc peridotite has a harzburgite composition, thus it contains mostly olivine and orthopyroxene (enstatite)...
member (Peridotite zone) consisting of alternating dunite, chromitite, harzburgite and bronzite pyroxenite. The upper third is massive, monotonous bronzitite...
and FARID CHEMALE-JÚNIOR. 2003. Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil...
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