Harzburgite

Classification：Igneous Rock

Harzburgite, an ultrabasic, igneous rock, is a variety of peridotites consisting of two major minerals, olivine and Ca - (Wan Huishi); it is named the site of the German halzi mountain range. It usually contains a few percent chromium spinel as auxiliary mineral. Quartzite with garnet is rare. It is commonly found in Kimberley rock.

Usually, partial melting is extracted from the pyroxene peridotite, called two pyroolivite, to form gabbro. Molten magma extracted from hematite may erupt in the form of basalt. If hematite continues to partially melt, all pyroxenite may be extracted from it to form magma, leaving the pyroxene poor peridotite, known as pure peridotite. Olivine and low Ca pyroxene in the continental crust basalt deep magma chamber (layered intrusive rocks) accumulation may also form olivine.

Happen：
The lithosphere is the most common type of peridotite in ophiolite, and is the debris of oceanic crust and underlying oceanic crust when it collides with continental crust. Examples of rich Harzburgite include the Harzburgite Ophiolites in Cyprus's Semail ophiolite in the coast of Oman's coastline ophiolite and the island bay ophiolite Newfoundland.

That mine is also available in some hartsburg is mainly composed of peridotite composition of Alpine peridotite massif. The alpine or orogenic low temperature represents the Asian mantle lithosphere (the upper mantle beneath the continental crust) exposed during the collision of continental plate tectonics. The example of the orogenic peridotite is the massif and Harzburgite including the Lherz block in France (Pyrenees), the Lanzuo block in northern Italy and the Horoman block in Japan.

The xenoliths found in the granolite Xenolite are found in some Kimberley rocks, which are found in the Archaean and Proterozoic age of the paleocontinental craton only. These cratonic mantle lithosphere is very thick (up to 200 kilometers or more) and very cool. Garnet harzburgites basalt component depleted less than most ophiolite harzburgites. Garnet harzburgite xenoliths from Kimberley rock in South Africa are especially characteristic.

Accumulative plagioclase is found in some large stratified igneous intrusions. On the earth's surface, basaltic magma usually crystallized minerals: olivine, plagioclase, and pyroxene (Gao Huishi's Ca); low Ca pyroxene can only coexist with olivine at low pressure in both MgO and SiO 2 (carbonate) magma. When the pressure is more than 5 thousand BA (0.5 GPa or 5000 times), olivine and low Ca pyroxene (opyrospite or copper mine) may crystallize with ordinary basalt magma to form olivine. These conditions are common mafic intrusions in some stratification, most of which are Proterozoic age, and the intrusion of Xuan Wuyan's huge bedrock forms the lower continental crust. A typical example of the accumulation of hematite in the Proterozoic stratified accumulation is the Stewart Igneous Complex in Montana, USA. It is also found in the Bush Wilde igneous complex, which is a large stratified intrusion in South Africa.