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Knowledge of the 187 Os/ 188 Os ratio as well as the inventories of rhenium and platinum group elements (PGE) in oceanic crust allows quantification of the proportion of recycled oceanic crust in oceanic basalt sources. Our knowledge is limited by the availability of well-characterized sections of oceanic crust, specifically of the plutonic, lower portion that has …


Peridotite or Dunite is an intrusive igneous rock, peridotite is coarsegrained and dense. It is light to dark green in color. Peridotite contains at least 40 percent olivine and some pyroxene. Unlike the olivine grains, the pyroxene grains in peridotite have a …


Platinum-Group Elements—So Many Excellent Properties. The PGE could play a crucial role in fuel cell technology, ... deposits are found with volcanic and plutonic rocks that form where large volumes of mafic magma move from the Earth's mantle into the crust. Erosion of PGE-enriched rocks and physical concentrations


Younger Precambrian (Proterozoic) rocks accreted along the south edge of the Archean craton in the Medicine Bow Mountains and in the Sierra Madre include two large layered mafic-ultramafic complexes and a variety of intrusive and metamorphic rocks that host both base and precious metals, including platinum.


Wrangellia ultramafic sample microprobe data Data File Format File Size Info; Download ri2020_006_ultramafic-microprobe-data: ASCII tabular files: 26.9 K


Igneous Rock # 1. Granite: Granite and other rocks of the granite family are the most widely distributed of the deeper plutonic igneous rocks forming the major component of the earth's crust. It is a light coloured rock. The dominant mineral of the rock is alkali feldspar which occurs as large crystals.


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Peridotite - Igneous Rocks

Peridotite is a plutonic rock, it is mostly composed of visible mineral grains. Other notable minerals that are often present are chromite, garnet, and plagioclase. It is an ultramafic rock (mafic minerals make up more than 90% of the rocks composition).


A vast composite body of plutonic and volcanic rock in the central part of the Transvaal, Bushveld igneous complex includes platinum reef worked by Rustenburg Platinum Mines Limited and constituting the world's greatest reserve …


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Igneous Rocks - SOEST

11 Photomicrograph of Granite Classification of Igneous Rocks Based on Mineral Composition and Texture Textures-reflect rate of cooling• Phaneritic-mineral crystals are visible e.g. Granite & Gabbro• Pegmatite-exceptionally large crystals e.g. Pegmatite• Aphanitic-crystals not visible e.g. Rhyolites & Basalt• Porphyritic-large crystals surrounded by small crystals-


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INTRUSION-RELATED DEPOSITS

the ultramafic rocks, being most abundant in the tectonites, especially dunitic tectonites. MINERALOGY: Chromite ((Mg, Fe)Cr2 O4) is the only mineral of chrome. Stratiform deposits may have associated PGEs (platinum, palladium, iridium, etc.). ALTERATION: None; however, ultramafic host rocks typically weather reddish-brown.


Just to its north is the famous Stillwater Complex, a thick body of platinum-bearing plutonic rocks. Other notable features in Montana are the glaciated country in the north, from Glacier International Park in the west to the windswept plains in the east, and the great Precambrian Belt complex in the Rockies.


plutonic rocks of the granite family. Since it has good strength and durability, can take a high ... It has many associated minerals including a source of platinum, and iron ore with some nickel and chromium in many localities. It is the principal source of asbestos and


Platinum is rare, with few noteworthy occurrences. Russia is the most important producer of Platinum specimens, producing fine nuggets along a north-south belt along the spine of the Ural Mountains. The districts producing the largest specimens are Nizhniy-Tagil in Sverdlovsk Oblast; and the Is River in Perm Kraj.


October 26, 2018. Representative Image: Igneous intrusion. In geology, a pluton is a body of intrusive igneous rock (called a plutonic rock) that is crystallized from magma slowly cooling below the surface of the Earth. Plutons include batholiths, stocks, dikes, sills, laccoliths, lopoliths, and other igneous formations. In practice, "pluton ...


platinum, palladium, and gold exists at the base of the Duluth Complex, along the northwest edge of the Mesoproterozoic ... plutonic rocks, formed from the cooling of molten rock, or magma, that rose up from the Earth's mantle. Plutonic rocks, such as gabbro and granite, form when magma ponds in chambers


Diorite is intrusive igneous rock cause we can see minerals on naked eyes and also plutonic rock to phonetic texture. Diorite Composition. Diorite composition principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. The chemical composition of diorite is intermediate, between that of ...


Platinum-bearing ultramafic massifs occur as bodies of concentrically zonal inner structures due to the successive replacement of dunite with pyroxenite and gabbro from their cores to margins. A most important peculiarity of such massifs is their dunite cores, to which commercial Pt deposits are related. There are a different opinions about genesis of these massifs and geological, …


In addition to gold bearing sands, deposits of platinum are often found in outcroppings of plutonic rocks like olivine and chromite. The formation of these rocks are a testament to platinum's pedigree, as all were exposed to extremely high temperature and pressure in order to produce this most valuable of metals.


Lab 2 (4 hours): PLUTONIC IGNEOUS ROCKS This lab will introduce you to the variety of plutonic rocks and rock suites. A suite is a group of petrogenetically related rocks. The lab will also acquaint you with the most widely ... reserves of platinum, palladium, chromium and vanadium. Most of the rocks are cumulates


Pyroclastic rocks are the product of explosive volcanism. They are usually felsic (high in silica). Examples of pyroclastic rocks are tuff and ignimbrite. Shallow intrusions, which possess structure similar to volcanic rather than plutonic rocks are also considered to …


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Examples of Plutonic Rocks

Peridotite is an important rock, because it may contain chromite, platinum, and diamonds. Dunite or olivine-rock. Dunite, or olivine-rock, is composed of olivine, with very little of other minerals. Usually light green. It is the principal platinum-bearing rock in the Ural Mts., Russia. Kimberlite or blue ground


In addition to gold bearing sands, deposits of platinum are often found in outcroppings of plutonic rocks like olivine and chromite. The formation of these rocks are a testament to platinum's pedigree, as all were exposed to extremely high temperature and pressure in order to produce this most valuable of metals.


2.2.3 Plutonic Rocks. ... The platinum bearing Merensky Reef (MR) is generally a conformable horizon of the BIC and it is accepted that this band is the first layer after a new magma influx was injected into the settling chamber, raising its temperature and introducing platinum. That is why the MR has a pegmatitic texture, with a much coarser ...


amount of au production probably similar in magnitude to platinum; present production of choco - pacifico is 13,000 toz pt p.a. and by native panning 10,000 to 15,000 toz annually Comments on the reserve resource information


Chromium and Platinum. ... What type of melting takes place when a body of hot mantle rock moves upward and the pressure is reduced to the extent that the melting point drops to the temp of the body? Decompression melting. To explain the great volumes of granite plutonic rocks, most geologists think that partial melting of the _____ must take ...


Plutonic rocks are igneous rocks that solidified from a melt at great depth. Magma rises, bringing minerals and precious metals such as gold, silver, molybdenum, and lead with it, forcing its way into older rocks.It cools slowly (tens of thousands of years or longer), underneath Earth's crust, which allows the individual crystals to grow large by coalescing, like …


Alaskan-type platinum-bearing plutons and potassium-enriched mafic to ultramafic volcanic rocks are temporally and spatially associated within the Late Cretaceous-Paleocene Achaivayam-Valaginskii intraoceanic paleo-arc terrain, allochthonously present in the Koryak Highland and Kamchatka Peninsula (Far East Russia). The compositions of magmas parental to the Alaskan …


Igneous rock – Wikipedia, the free encyclopedia … granites and diorites, whereas ores of chromium and platinum are commonly … Hypabyssal rocks are less common than plutonic or volcanic rocks and often … »More detailed


The rock powders were then mixed with Li 2 B 4 O 7 (1:5), molten and poured into platinum crucibles to obtain glass discs using a Class M4 fluxer. Major and selected trace elements of the glass discs were analyzed using an X-ray fluorescence spectrometer (WD-XRF, Axios, PANalytical) at the Institute of Geochemistry and Petrology at ETH Zurich.


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Syenite - Igneous Rocks

Syenite is an igneous rock that solidified slowly in the crust in a similar manner to granite.A true syenite (sensu stricto) is also compositionally resembling granite.The most notable difference is the absence or very low quantity of quartz while it is an essential component of granite.


Porphyry copper deposits occur within or in roof rocks above felsic plutons. The two major plutonic rock categories based on chemical composition are alkaline, and calc-alkaline (a sub-division ofsubalkaline). The alkaline-subalkaline divisions are based on relative amounts of Kl0 + Na2) and Si02 as shown in Figure I, below, from Philpotts (1990).


The knowledge of geology and geochemistry is significant in the search for Platinum Group of Metals (PGMs)–nickel–chromium mineralization. The favorable host rocks are the product of magma/lava that includes plutonic and volcanic mafic to ultramafic rocks of Archaean–Proterozoic–Mesozoic age.


A vast composite body of plutonic and volcanic rocks in the central part of the Transvaal, the Bushveld igneous complex includes the platinum reef worked by Rustenburg Platinum Mines Limited and constituting the world's greatest reserve of the platinum metals. This article describes the geological and economic aspects of this unusually interesting formation.


There are two types of rocks based on the presence of acid-forming radical, silicon, acidic rocks and basic rocks. Intrusive igneous rocks (Plutonic rocks) If magma cools slowly at great depths, mineral grains formed in the rocks may be very large. Such rocks are called intrusive rocks or plutonic rocks (e.g. Granite).


The pyrite contains the gold. In the gold-bearing region of Northern Sonora, Mexico, the gold-veins are chiefly in or closely associated with granitic and plutonic rocks. The veins of El Grupo concession, about 100 miles southeast of Tucson, Arizona, traverse a fine-grained granite, and hear both gold and silver.


Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. All magma develops underground, in the lower crust or upper mantle, because of the intense heat there.. Igneous rocks can have many different compositions, depending on the magma they cool from.


Interpretation of 40 analyses for platinum, palladium, and rhodium in volcanic and plutonic rocks of the belt indicates a strong geochemical correlation between the two groups of rocks and is in support of their being cogenetic either from directly connected magma chambers and flows or indirectly by selective concentration processes from ...


plutonic rocks have Mesoarchean ages. The old domain includes the 2.9 to 3.0 Ga greenstone belts at Finlayson and Lumby Lakes and the 3.0 Ga Marmion batholith (Davis and Jackson, 1988), and is intruded by younger plutonic rocks represented by the 2.69 Ga White Otter Batholith (D. Davis, personnal communications, 1993).