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.
and Williams, H., 1975, [sup.40]Ar/[sup.39]Ar ages from the Bay of Islands metamorphic aureole: Their bearing on the timing of Ordovician ophiolite: Canadian Journal of Earth Sciences, v.
and Smyth, R., 1973, Metamorphic aureoles beneath ophiolite suites and Alpine peridotites: tectonic implications with west Newfoundland examples: American Journal of Science, v.
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
. The ophiolite zone diverges westward into branches, separated by country flysch.
The Musquodoboit Batholith (MB) intrudes metasedimentary rocks of the Meguma Group, and a narrow contact metamorphic aureole
containing cordierite porphyroblasts in finer grained biotite and andalusite hornfels is developed within a few hundred metres of the contact (MacDonald and Clarke 1985; Ham 1993; Horne et al.
Gottschalk, "Mineral-fluid equilibria in the system CaO-MgO-Si[O.sub.2]-[H.sub.2]O-C[O.sub.2]-NaCl and the record of reactive fluid flow in contact metamorphic aureoles
," Contributions to Mineralogy and Petrology, vol.
beneath ophiolite suites and alpine peridotites: tectonic implications with west Newfoundland examples.
Most of the economic brucite deposits appear to be hosted by marbles affected by high-temperature, low-pressure metamorphism (mainly in pluton-associated, contact metamorphic aureoles