Rocks gabbro

Figure 1.166. Distribution or initial Sr/ Sr (r, ) for the Cretaceous-Paleogene plutonic rocks. Open squares gabbros open circles granites. Numbers indicate the last two or three digits of r, values. Solid squares and solid circles imply the magnetite-series open squares and open circles the ilmenite-series. (Shibata and Ishihara, 1979).

As displayed in Figure 4, basalt, gabbro, and peridotite has distinctly different spectral signature and shows texture variations between different rock types. 

Remote sensing techniques have been successfully applied for the identification of rocks in Cape Smith fold belt region. Principal Component Analysis is very effective for the separation of gabbro, metabasalt and peridotite. Band Ratio was helpful for the preliminary identification of peridotite. Supervised Classification approach is taken to verify the results obtained by Principal Component Analysis and Band Ratio. It is also useful to remap the unknown regions once the results are verified. 

Table 5.4 Olivine major element compositions (in weight %). Samples occur in different types of rocks (1) = forsterite from a metamorphosed limestone (2) = hortonolite from an olivine gabbro (3) = fayalite from a pantelleritic obsidian (4) = fayalite from an Fe-gabbro (5) = forsterite from a cumulitic peridotite (6) = forsterite from a tectonitic peridotite. Samples (1) to (4) from Deer et al. (1983) sample (5) from Ottonello et al. (1979) sample (6) from Piccardo and Ottonello (1978). ...

Enstatite-bronzite (MgTel Si O, Gabbros Mg-iich ultramafic rocks serpentinites meteorites... 

Augite (Ca,Mg,Fe,Al)2(Si,Al)206 Basalts, andesites, tephrites, limburgites gabbros, dolerites, ultramafic rocks. Sometimes in granites... 

Supergroup. The principal rock-types in the intrusion are syenites, granites and gabbros, and associated pegmatitic bodies hosting rare metal mineralization. Five distinct zones of rare metal mineralization have been identified as potentially economic. The Lake Zone is one of them and is characterized by its enrichment in the more valuable HREE (Eu, Tb, and Dy), relative to light rare earths (LREE, i.e.. La and Ce) (Palmer Broad 2007). 

Olivine crystallizes from magmas that are rich in magnesia and low in silica and which form such rocks as gabbros, norites, peridotites and basalts. The metamorphism of impure dolomites or other sediments in which the magnesia content is high and silica low seems to produce olivine. 

It is a coarse-grained igneous rock related to gabbro, which consists of olivine and pyroxene in varying proportions. Certain pendotites contain spinel, chromite, or mica as accessories. 

Basalts and gabbros are the dominant igneous rocks in oceanic crusts. In rare circumstances, the mafic rocks of the oceanic crust (e.g. at the Mid-Atlantic Ridge) contain various arsenic minerals, including... 

Baghouse Fabric filters used to remove fine-grained particles from flue gas in combustion facilities. Basalt An extrusive mafic igneous rock. An extrusive equivalent of a gabbro. 

Diorite An intermediate intrusive igneous rock that is more mafic than a granodiorite and more felsic than a gabbro. 

Gabbro An intrusive mafic igneous rock. Basalts are extrusive equivalents of gabbros. 

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