ultrabasic


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ultrabasic

[¦əl·trə′bā·sik]
(petrology)
Of igneous rock, having a low silica content, as opposed to the higher silica contents of acidic, basic, and intermediate rocks.
References in periodicals archive ?
As follows from the above data, the SG-3 section is represented by a very wide range of rocks from ultrabasic to acidic composition of different degree of processing, metamorphism, structural and textural features.
Ironstone genesis is usually associated with weathering of Fe-rich basic (Schwertmann 1993; Beauvais 2009) or ultrabasic (Trescases et al.
Physical and Mechanical Properties of Serpentinized Ultrabasic Rocks in NW Turkey.
Geology Rank Weight Total weight Charnockite Group 6 4 24 Gneiss 6 4 24 Ultrabasic rocks 6 3 18 (a) Geology Weight.
This mineral occurs in calc-silicate marbles with no ultrabasic rocks occurring either as enclaves or as discrete bodies in the vicinity.
Eocene flysch facies in the study area, set in the South East of Iran, the zone name Zabul - Baluch, Sistan Suture zone and or zone Nehbandan - Kash is Rock units in the study area includes a colorful melange , flysch of Cretaceous, Paleocene and Eocene flysch of the ultrabasic parts, materials, volcanic and clastic rocks are Neogene [1].
Rivera-Gomez, "New computer program TecD for tectonomagmatic discrimination from discriminant function diagrams for basic and ultrabasic magmas and its application to ancient rocks," Journal of Iberian Geology, vol.
Geologists classify igneous rocks as acid, intermediate, basic or ultrabasic on the basis of their (decreasing) content of silica (Si[O.sub.2]), the fundamental building block of igneous rocks.
The area is a part of the northeastern Ethiopian highlands, dominantly covered by basic and ultrabasic rocks (basalt, hornblende, serpentinite, and peridotite), and pyroclastic rocks both consolidated and unconsolidated [18].