The sharp offset in the andalusite-in isograd assists mapping the stratigraphic contact within the metamorphic aureole.
All these units and structures are overprinted by regional Neoacadian folds and cleavage, and by the metamorphic aureole of the Halifax Pluton.
The metamorphic aureole
that surrounds the granite moorlands contains much hidden and as-yet-unexploited treasures--none of piratical origin
Especially, our research addresses the emplacement conditions of the pluton in the low--medium grade metamorphic country rock that produced a contact metamorphic aureole around the pluton.
The name Parashi Pluton was proposed by Renz (1959) and redefined by Lookwood (1965) as Parashi Quartzdiorite, who characterized the body as a mesozonal intrusion with a narrow contact metamorphic aureole in the country rock and reported a hornblende K/Ar age of 48 [+ or -] 4 Ma in a quartzdiorite sample from the pluton.
A contact metamorphic aureole is observed around the pluton, in the west margin, the width of the aureole is about 50 m.
Andalusite mineralisation occurs in the Transvaal basin in pelitic strata where these fall within the metamorphic aureole
of the Bushveld Complex that intruded the Transvaal Supergroup sediments about 2,050 million years ago.
Intrusion-like ophiolite bodies outcroped in Renbu, where country layers maintain sub-concordant contact to the ultramafic bodies with contact metamorphic aureole
beneath ophiolite suites and alpine peridotites: tectonic implications with west Newfoundland examples.
Contact metamorphic aureoles that overprint siliceous dolomite-bearing carbonates are divided into two categories: those aureoles that, at the peak of high-grade metamorphism, contained periclase-forsterite-calcite and those that contained dolomite-forsterite-calcite (no periclase) assemblages.
Such settings coincide with the highest metamorphic grade of metamorphic aureoles (near intrusive-carbonate contacts and along nearby fault and fracture zones), where the hydrothermal fluid travels quickly without cooling down because of its reactions with the host rock.
Although brucite is relatively widespread as an accessory mineral in a variety of rock types, Mg-rich carbonate horizons within contact metamorphic aureoles have the best exploration potential.