The crustal section of the Muslim Bagh ophiolite consists of bands of dunite wehrlite
pyroxenite at the base overlain by the layered and foliated gabbro.
The second type recognized in the mafic-ultramafic bodies is dominated by variably metamorphosed ultramafic rocks (lherzolite, harzburgite, wehrlite, dunite, and pyroxenite; Fig.
Occurrences of major mafic-ultramafic bodies in the northern Dashwoods Subzone # (a) Location Lithology Mineralogy (b) 1 Puddle Pond Troctolite, ol-gabbro, Varying amounts of gabbro, hbl gabbro, Ol+Pl+Cpx+Hbl+Opx+/-Bt# ol-norite 2 John's Brook Gabbro, hbl-gabbro Cpx+Pl+Hbl# Lake gabbro 3 Whaleback Lherzolite, dunite, Relic Ol+Cpx+opx; Pond websterite, wehrlite, Tr+Chl+Srp+Car; Hbl+Pl# metagabbro 4 W of Silver Dunite, wehrlite, Relic O1+Cpx+Opx+Cr; Pond harzburgite, Tr+Chl+Srp+Car; Am+Chl pyroxenite, gabbro.
The Union Bay prospect hosts a zoned ultramatic/mafic complex that ranges from dunite in the core on the southeastern side of the complex, to wehrlite
and magnetite-bearing olivine clinopyroxenite, to hornblendite and gabbro in the margins.
The crust of the Muslim Bagh ophiolite is only exposed in STGM and consists of cumulate dunite, wehrlite
and pyroxenite at the base, overlain by the layered and foliated gabbro.
Rock types sampled in the Duck Lake Pluton include gabbro, orthopyroxene gabbro, gabbronorite, olivine gabbronorite, anorthosite, dunite, and wehrlite
(Grammatikopoulos 1992; White 1996).
It comprises of cyclic successions of layered dunite, wehrlite
, pyroxenite and both layered and foliated gabbro.
Clinopyroxene -- melt thermobarometry shows that Cr-diopside -- type 2 glass pairs in harzburgite formed at 1.4 to 1.1 GPa and 1250 [degrees]C whereas Cr-diopside -- type 2 glass pairs in wehrlite
formed at 0.9 to 0.7 GPa and 1120 -- 1200 [degrees]C.
The ultramafic rocks consist predominantly of harzburgite, followed by wehrlite
These units are tectonically overlain by Upper Cretaceous ophiolitic rocks (harzburgites, dunites, wehrlites
, pyroxenites, gabbros, and serpentinites).