This is based on the following evidences: Field relations between the different lithotypes of metabasites reflect the occurrence of a prograde metamorphism, which is manifested by an increase of metamorphism from the greenschist facies (chlorite and actinolite schists with or without garnet, and metabasalts) to the amphibolite
with or without garnet).
Both holes collared in amphibolite
and intersected 20m wide zones of chlorite-epidote+/-sericite alteration near surface, with anomalous gold values ranging from trace to 0.
Partial melting of amphibolite
eclogite and the origin of Archean trondhjemites and tonalites.
The metamorphic rocks of the Silgara Formation in the Santander Massif (Figure 1) were metamorphosed to upper amphibolites
facies during the Caledonian orogeny, developing a sequence of metamorphic zones (biotite, garnet, staurolite and sillimanite) that defines the regional thermal structure.
1990) the high-grade metamorphic rocks in both the Chuggin Road and Lime Hill units include biotite, bioitite-cordierite, and sillimanite-bearing paragneiss, migmatitic paragneiss, marble, quartzite, amphibolite
, and tonalitic orthogneiss.
The acoustopolarigrams of amphibolite
, as a rule, point to the influence of four factors occurring in different combinations and rate: elastic anisotropy, the LAAA effect, microcracks and heterogeneity.
2002): Geochemistry and geotectonic setting of migmatitic gneisses and amphibolites
in the Okene-Lokoja area of SW Nigeria.
Other possible minor sources of amphibolite
are Early Permian glacial tillites which occur near Lithgow on the western side of the Blue Mountains, in the central Hunter Valley, and in the Shoalhaven region.
Preliminary geological assessment suggests that one important lode is hosted near the margin of an amphibolite
According to Sono Resources Inc, the licenses include both Ghanzi (Kalahari Belt) and Matchless Amphibolite
Metamorphic rocks Amphibolite
Dry 32 Gneiss Dry 26-29 Gneiss Wet 23-26 Slate Dry 25-30 Slate Wet 21 Table 2.
These systematics were examined in a sample of banded amphibolite
gneiss, part of the Ropes Creek Metabasalt, collected near Carrollton, GA.