alkaline rock

It is usually found growing on limestone or other alkaline rocks.

Therefore, it is classified geochemically as alkaline rock.

Older sandstones consider to include also rhyolite and younger include alkaline rocks.

The alkaline clinopyroxene and amphibole are characteristics of typical alkaline rocks.

The alkaline rocks.

Both polytypes occur in hydrothermal vents in alkaline rocks.

Because of the presence of feldspathoids, nepheline syenite is classified to be a typical alkaline rock.

Alkaline rocks:

Proposed origin: Metamorphic synorogenic alkaline rocks.

Cretaceous volcanism did also left small units of sodic alkaline rocks in Misiones Department in southern Paraguay.

It also occurs in Na-rich pegmatites in alkaline rocks, and as an alteration product in some nepheline syenite intrusions.

In nature, carbonate rocks, potentially carbonatite, kimberlites, carbonate-bearing melilitic rocks and other rare alkaline rocks may satisfy these criteria.

A range of alkaline rock types not commonly found in the Western Cordillera are regionally widespread in the Northern Cordilleran Volcanic Province.

Richards' work helped to improve the Bessemer process for making steel, in the case when the ore is rich in phosphorus, and an alkaline rock (dolomite, limestone or magnesite) is used.

Looking at Azobe Wood Industry executives said the leading theory among Metro-North engineers was that the problem dated from 1983, when Lone Star switched quarries and began using more alkaline rock.

Geochemical evolution of the felsic alkaline rocks of Tanguá, Rio Bonito, and Itaúna intrusive bodies, State of Rio de Janeiro, Brazil.

A similar phenomenon is observed in felsic alkaline rocks, such as nepheline syenite, alkaline syenite, phonolite, and trachyte, because of weathering vulnerability of nepheline and alkaline feldspar.

Textures and structures presents in alkaline rocks: gneissose appearance, foliation, preferred orientation of biotite crystals, faults, boudinage, plagioclase with bent twin lamella; feldspar with peristherite, plagioclase with undulose extinction.

It is observed commonly in: felsic alkaline rocks, such as nepheline syenite, phonolite and trachyte; pyroclastic rocks, as pyroclastic flow deposit, fine air-fall deposits and vent-filling pyroclastic deposits; sedimentary rocks, as sandstone and mudstone.

The rocks, which included unusual alkaline rocks, were not merely mapped, but studied in detail using petrographic and chemical methods, and firm conclusions were drawn about their petrogenesis, all of which was unusual for a GSC Memoir at that time.