Overview of Results from the Greenstone ... - Geology Ontario

▪
▪
providing an improved understanding of the late sedimentary assemblages indicating that detritus for
the Porcupine assemblage sedimentary rocks in the Timmins area was of local derivation with
detrital zircon input peaking at approximately 2700 to 2690 Ma, coincident with the onset of D1.
Detritus for the Timiskaming assemblage sedimentary rocks were derived from both local Abitibiage,
and external pre-Abitibi sources indicating a more widespread provenance. The detrital zircon
input peaked at 2690 to 2670 Ma, coincident with D2 and D3 folding and faulting.
revising the stratigraphic nomenclature to make a more straightforward correlation with Quebecbased
Abitibi stratigraphy by establishing a lower Kidd–Munro assemblage, a lower Tisdale
assemblage and a lower Blake River assemblage.
We have improved understanding of the stratigraphy, facies associations and metallogeny at
township scales within VMS and Ni-Cu-PGE bearing assemblages in a number of specific areas including
In the Kamiskotia area by
▪ correlating the stratigraphy and the contained VMS mineralization to the upper Blake River
assemblage;
▪ tracing mineralized stratigraphy from the Kam-Kotia to the Jameland deposits;
▪ recognizing for the first time the alteration signatures of the various Kamiskotia deposits;
▪ relating a number of the Kamiskotia VMS deposits to synvolcanic faults (e.g., Genex Mine).
In the Ben Nevis area by
▪ developing stratigraphic and geochemical correlations with the uppermost part of the Blake River
assemblage and comparisons with the Noranda and LaRonde camps;
▪ documenting overprinting relations between VMS and porphyry style mineralization associated with
the Clifford stock.
In the Munro and Currie townships areas by
▪ documenting the regional setting of VMS mineralization in the Kidd–Munro assemblage at the Potter
and Potterdoal mines and constructing a stratigraphic sequence in the central part of the assemblage
in Munro Township;
▪ documenting lithologies, geochemical patterns and structural overprinting of the upper Tisdale and
lower Blake River assemblages stratigraphy in Currie Township.
In the Shaw Dome area by
▪ documenting the regional setting of Ni-Cu-PGE mineralization in the Tisdale assemblage;
▪ indicating the presence in the Shaw Dome of important criteria for generation of magmatic sulphide
deposits including fertile komatiitic magma (metal source), proximity to sulphide iron formation
(sulphur source), abundant olivine cumulate (heat source and dynamic system), and footwall
embayments (physical traps);
▪ showing that Ni-Cu-PGE deposit-types occur in clusters implying a significant potential for
discovery of additional deposits in the Tisdale assemblage (e.g., the Bartlett and Halliday domes).
91