Petrographically, these rocks, known as black granites in commercial market, are fine to medium-grained having ophitic to sub-ophitic texture with plagioclase and clinopyroxene
as the major mineral phases, while opaques, quartz, biotite, amphibole, olivine, apatite, chlorite, orthopyroxene and epidote occur as minor to accessory phases.
The phenocrysts include orthopyroxene, clinopyroxene
, plagioclase, and Timagnetite.
Qz: quartz; Ap: Apatite; Cpx: clinopyroxene
; Pl: plagioclase; Or: orthoclase; Mag: magnetite; Ilm: ilmetite.
The main minerals of metagabbro samples are clinopyroxene
The presence of clinopyroxene
, hastingsite, with or without paragsite, characterizes the intermediate zone, while only clinopyroxene
with minor arfvedsonite were noted in the periphery.
Experimental partitioning of high field strength and rare earth elements between clinopyroxene
and garnet in andesitic to tonalitic systems.
The main constituents are recrystallized, equigranular (roughly equal in in size) feldspar, clinopyroxene
, alkali-amphibole, mica, magnetite, zircon and ilmenite, but with a pervasive "overgrown" nature.
In accordance with these observations, a variable proportion of interstitial minerals, including clinopyroxene
, [H.sub.2]O-bearing phases (amphibole, phlogopite) and other accessory minerals (e.g.
(2012) Orientation-related electrical con ductivity of hydrous olivine, clinopyroxene
and plagioclase and implications for the structure of the lower continental crust and uppermost mantle.
The minerals of these rocks consists of olivine, clinopyroxene
, orthopyroxene and chrome- spinel that have mesh and granular texture that altered to serpentine minerals and iron-oxid (Fig.