| Its lower part displays alternating bands of peridotite, pyroxenite, and dunite, but dunite is dominant throughout most of the unit. |
|
| Dolerite dykes that cut the peridotite show chilled margins and local metasomatic calcic alteration. |
|
| Such rocks are important in defining ages for crustal rocks underlying the peridotite. |
|
| It is clear nevertheless that transforms are sites where deep-seated rocks, such as serpentinized peridotite, are relatively common. |
|
| Enstatite occurs in plutonic basic and ultrabasic rocks such as peridotite and norite, and also in some high-grade metamorphic rocks. |
|
| The mantle is thought to be made up mostly of peridotite, a type of rock composed of iron, magnesium, silicon, and oxygen. |
|
| The formation and preservation of the peridotite mylonite in particular presents problems of interpretation. |
|
| At the base of the crust, belonging to the underlying mantle, are heavy rocks with a high percentage of iron and magnesium, such as peridotite. |
|
| The NISK-1 deposit occurs as a layer of sulphides deposited at the base of a black serpentinized peridotite sill with asbestos veinlets. |
|
| However, natural gas can also form abiotically, as a result of chemical reactions in a kind of volcanic rock called peridotite. |
|
| The best results were from a peridotite body in the centre of the property, southeast of Lake Nemo. |
|
| The nickel sulphide mineralization occurs in a peridotite associated with the contact zone between granitic and mafic volcanic rocks. |
|
| This band, composed of pyroxenite and gabbro, is sandwiched between a peridotite intrusion to the north and a band of pegmatite to the South. |
|
| These two companies are looking for nickel-copper-PGE deposits in peridotite horizons similar to those at the Raglan mine. |
|
| The nickel sulphide mineralization is found in a peridotite associated with this contact zone. |
|
| In Geirangerfjord there are outcrops of peridotite and serpentinite in the predominant gneiss bedrock. |
|
| The Tablelands are composed of an igneous rock called peridotite from the upper mantle. |
|
| Strongly foliated porphyroblastic politic gneiss forms a selvedge up to 100 m thick in sharp contact with peridotite on the northern margin of the Carratraca massif. |
|
| Ultra-slow spreaders, however, also contain a lot of peridotite, which comes from deeper down and is much richer in magnesium and iron. |
|
| The first, a grey serpentinized peridotite with magnetite veinlets, does not contain any sulphide minerals. |
|
|
|
| The sulphide mineralization is clearly concentrated on the NW side of the black serpentinized peridotite intrusion. |
|
| The magma contains components of the sediments and weathered oceanic crust from the Nazca plate as well as the peridotite in the mantle beneath South America. |
|
| Diamonds sometimes contain minute inclusions of the minerals garnet, olivine, and pyroxene, which indicate formation in two major mantle rock-types, peridotite and eclogite. |
|
| The major rock type, peridotite, has a high magnesium and iron content which is toxic to many plants and low in other nutrients required by most plants. |
|
| The rocks underlying the Lac à Paul property are part of a mafic to ultramafic sequence including anorthosite, leuconorite, norite, gabbronorite, olivine gabbro, pyroxenite and local peridotite, dunite and magnetitite. |
|
| Diallage is commonly dark green or bronze-coloured and often occurs as large crystals enclosing the silicate olivine in basic to ultrabasic rocks such as gabbro and peridotite. |
|
| The rock occurs some 20km or more down, although in areas where plate tectonics have forced up some of the mantle, peridotite reaches the surface. |
|
| Some people have looked at the idea of grinding up peridotite and using it to soak up emissions from power stations, but the process turns out to be expensive, partly because of the costs of transporting all the rock. |
|
| The two most important diamond source rocks are peridotite and eclogite, and each rock type contains a characteristic suite of minerals that are key indicators for diamond exploration. |
|
| The sill is a composite, consisting of at least two separate intrusive phases: a grey unmineralized serpentinized peridotite, and a black serpentinized peridotite mineralized in Ni-Cu-Co-Fe sulphides. |
|
| A Deep EM geophysical survey performed at the Alpha showing, indicates a weak anomaly striking east within the peridotite, away from the area explored in prior programs. |
|
| While the Ni, Cu, Pd and Pt are all concentrated in a sulphide zone within the black serpentinized peridotite, the correlation among all these elements is weak. |
|
| A lot of sulphides were observed on the property, mainly as disseminated pyrrhotite and traces of chalcopyrite in peridotite outcrops, pyroxenite blocks and sulphide-enriched argillites. |
|
| The Elmtree Inlier forms a roughly circular pattern near the Madran and Elmtree rivers and includes gabbro, peridotite, and metasedimentary rocks. |
|
| Within the rugged terrain serpentinized peridotite and gabbro are capped with a thin layer of extrusive basalt. |
|
| Mantle peridotite is hydrated into serpentinite, which is much less dense than peridotite and so rises diapirically when it can. |
|
| Xenoliths of dunite, peridotite and spinel lherzolite in basaltic lava flows are one example. |
|
| Rounded, yellow, weathered peridotite xenolith in a nephelinite lava flow at Kaiserstuhl, SW Germany. |
|
| The peridotite unit rocks are the most altered part of Noorabad ophiolite including dunite, harzburgite and lherzolite. |
|
| Some of the fluids, those in equilibrium with mantle peridotite minerals, contained the expected carbon dioxide and methane. |
|
|
|
| The risk increased with serpentinite surface, proximity to serpentinite quarries and distance to the peridotite massif. |
|
| Oceanographic Institution, disputes Bonatti's assumption that peridotite at hot spots must rise quickly. |
|
| As the oceanic crust moves away from the ridge axis, the peridotite in the underlying mantle cools and becomes more rigid. |
|
| The crust and the relatively rigid peridotite below it make up the oceanic lithosphere. |
|
| This peridotite body was uplifted from upper mantle during a collision between Eurasian Plate and North American Plate about 20 million years ago. |
|
| The most distinctive feature is the ultrabasic ophiolite, peridotite and gabbro on Unst and Fetlar, which are remnants of the Iapetus Ocean floor. |
|
| The drilling also indicated that sulphides are regularly present in altered peridotite and pyroxenite gneisses underlying the mineralized laterite. |
|
| Topographic and soil differences from peridotite to serpentinite. |
|
| Both continental and oceanic crust rest on peridotite of the mantle. |
|
| The inner trench slope of these convergent margins exposes the crust of the forearc, including basalt, gabbro, and serpentinized mantle peridotite. |
|
| The MSU is modelled as being a southward plunging, lenticular body that runs parallel to, but above, the coarse grained feldspathic peridotite intrusion. |
|
| Peridotite at depth in the Earth's mantle may be hotter than its solidus temperature at some shallower level. |
|
