harzburgite


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Related to harzburgite: Lherzolite, dunite, eclogite

harzburgite

[′härts‚bər‚gīt]
(petrology)
A peridotite consisting principally of olivine and orthopyroxene.
References in periodicals archive ?
Petrographically the harzburgite from the mylonitic peridotite are darker in colour and less altered than associated dunite.
Physiographically, weathering of the gabbro bedrock produces gentler slopes and broader summit ridges than weathering of the harzburgite, resulting in relatively greater physical area at high elevations and facilitating soil development, creating a more hospitable and diverse edaphic environment for most plant species.
1990, Harzburgites and refractory melts in the Lewis Hills massif, Bay of Islands ophiolite complex: The base-metals and preciousmetals story: The Canadian Mineralogist, v.
Inside the serpentinites still traces of Pridotites of Harzburgite and sometimes Lherzolite combination is observed in the form of floating pieces.
The JTGM is essentially composed of harzburgite and dunite, but lherzolite has also been reported from the lowermost part of the massif (Mahmood et al.
Latter, Aguilar (1977) also found isolated basalts (60% modal olivine) near Pueblo Nuevo town, which Galli (1979) interpreted as harzburgite.
5 Lake of the Metapyroxenite, Tr+Chl+Tlc Hills harzburgite 6 Padille Pond Lherzolite, harzburgite Relic O1+Cpx; Srp+Car+Tr+Chl 7 Lloyds River Dunite Ol+Tr 8 Dennis Pond Serpentinite, Ol+Srp+TIc+Car+Cr+Chl; metagabbro Hbl+Ep+Zo+Chl# 9 Three Ponds Serpentinite, Srp+Tlc+Chl+Car; metagabbro Hbl+Ep+Zo+Qtz# 10 North Fischells Serpentinite, Srp+Chl+Tr+TIc; Brook metagabbro Pl+Hbl+Qtz# 11 Long Range Harzburgite, Ol+Opx+Tlc+Tr Complex lherzolite, pyroxenite, gabbro # (a) Location Exposed contact Source relationships 1 Puddle Pond Cut by granite of This study; Dunning and presumed Silurian age Herd (1980) 2 John's Brook Cut by granite of This study; Dunning and Lake gabbro presumed Silurian age Chorlton (1985) 3 Whaleback Surrounded by ca.
2001), ultra-depleted harzburgite layer above more fertile lherzolite (Griffin et al.
Diamonds are known to occur in three peridotite subtypes: dunite (90% olivine), harzburgite (40-90% olivine, the rest orthopyroxene and garnet), and lherzolite (at least 40% olivine, with orthopyroxene and clinopyroxene in a wide range of proportions, and minor garnet).
The harzburgite consist of enstatite 25-30 Percent , olivine 5 - 10 Percent , serpentine 55-60 Percent and spinel 3-5 Percent .
The nickel ores of the Lord Brassey mine, and the iridiumosmium ores of Bald Hill, occur within the Heazlewood Ultramafic Complex, a body of largely serpentinized gabbro, pyroxenite, harzburgite, peridotite, dunite and related rocks of Cambrian age (Williams, 1958; Peck, 1990; Peck and Keays, 1990).