| Title | TGI 4: Investigating structural and tectonic controls on Devonian intrusion related mineralisation on the Connaigre Peninsula, Newfoundland |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Rogers, N; Ruberti, G; Kellett, D A ; van Staal, C R; Hanchar, J |
| Source | TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; by Rogers, N (ed.); Geological Survey of Canada, Open File 7843, 2015 p. 571-572, https://doi.org/10.4095/296496  Open Access |
| Links | Canadian Database of Geochemical Surveys, downloadable
files
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| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
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| Image |  |
| Year | 2015 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in TGI 4 - Intrusion Related
Mineralisation Project: new vectors to buried porphyry-style mineralisation |
| Related | This publication is related to the following
publications |
| File format | pdf |
| Province | Newfoundland and Labrador |
| NTS | 1M |
| Area | Connaigre Peninsula |
| Lat/Long WENS | -56.5000 -55.0000 48.0000 47.5000 |
| Subjects | economic geology; tectonics; structural geology; porphyry deposits; porphyry copper; mineral exploration; mineralization; alteration; indicator elements; tungsten; molybdenum; tin; bismuth; mineral
deposits; structural interpretations; tectonic models; tectonic environments; tectonic elements; intrusive rocks; granitic rocks; tectonostratigraphic zones; structural features; structural analyses; Paleozoic; Devonian |
| Illustrations | location maps; plots; photographs |
| Program | Targeted Geoscience Initiative (TGI-4) Intrusion/Porphyry Ore Systems |
| Released | 2015 06 11; 2023 03 17 |
| Abstract | Targeted Geoscience Initiative 4 (TGI 4) is a 5 year Government of Canada program to help produce the next generation of innovative geoscience knowledge and analytical techniques that will result in
more effective targeting of buried mineral deposits. The Geological Survey of Canada in collaboration with provincial and territorial surveys, industry and academia will conduct thematic, knowledge-driven projects based around ore systems. The
thematic nature of TGI 4 means that individual projects are not defined by geographic region, but instead integrate data and knowledge from multiple sites across Canada, to optimise ore system categorisation.
Intrusion related (e.g., porphyry)
deposits are the most important sources for Cu, Mo, W and Sn, along with Au, Ag, and PGEs. Porphyry deposits are large, low- to medium-grade deposits in which mineralisation is hosted within and immediately surrounding distinctive intrusive phases
within larger intrusive complexes that commonly have a complex and prolonged emplacement history. The metallogenic contents of intrusion related deposits are diverse, reflecting a variety of tectonic settings.
The Connaigre Peninsula was selected
to study the structural and tectonic controls on the formation of granitoid intrusion-related Sn-W-Mo mineralisation as it contains a variety of supracrustal units plus (apparently) barren and mineralised intrusives within a relatively constrained
and accessible area. The main mineralised zones are related to the ca. 376 Ma Old Woman Stock and ca. 377 Ma phase of the Ackley Granite (Rencontre Lake facies of Tuach, 1987).
The detailed bedrock map of O'Brien (1992) has been simplified to
highlight the main lithotectonic packages. Their distributions indicate three distinct tectonic blocks (herein Gander, Deadman's Bight and Wreck Cove blocks) that were amalgamated during the Devonian along major fault zones. The topographically
prominent Hermitage Bay Fault has traditionally been considered to represent the Gander - Avalon boundary in this area. However, the recently obtained Silurian age for the Pass Island Granite indicates against this, as Avalonia (sensu lato) was on
the passive margin at that time. In contrast to the Hermitage Bay Fault, the White Horse - East Bay fault zone, although major break, is obscured by younger sequences and so its exact position is unknown. It is interpreted to be positioned to the
north-west of the Cambrian passive margin style sequences of the Young's Cove Group. In this model the White Horse - East Bay fault zone also separates the Upper Devonian Poole's Cove and Great Bay De L'Eau formations. As these formations: i) occupy
approximately the same stratigraphic position; ii) are both red to buff coloured sandstone to boulder conglomeratic sequences; and iii) both appear to unconformably overlie the likely Lower Devonian Cinq Isles Formation, they are considered as a
single map unit for this study. |
| Summary | (Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience
knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This volume summarises research activities completed under the TGI 4 Intrusion Related Mineralisation Project that
focused on porphyry-style ore systems related to the Cu- and Cu-Mo deposits of South-Central British Columbia and the Sn-W-Mo-In deposits in New Brunswick, Nova Scotia and Newfoundland. |
| GEOSCAN ID | 296496 |
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