| Title | Bedrock geology, northwest part of Nuluujaak Mountain, Baffin Island, Nunavut, part of NTS 37-G/5 |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Jackson, G D |
| Source | Geological Survey of Canada, Canadian Geoscience Map 408, 2021, 1 sheet, https://doi.org/10.4095/314670  Open Access |
| Image |  |
| Year | 2021 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Maps | 1 map |
| Map Info. | geological, regional geology, 1:25,000 |
| Projection | Universal Transverse Mercator Projection, UTM zone 17 (NAD83) |
| Media | on-line; digital |
| Related | NRCan
photo(s) in this publication |
| Related | This publication is related to the following
publications |
| File format | readme
|
| File format | pdf; rtf; gdb (ESRI® ArcGIS(TM) v.10.x); shp (ESRI® ArcGIS(TM) v.10.x); xml; mxd (ESRI® ArcGIS(TM) v.10.x); xlsx (Microsoft® Excel® 2010) |
| Province | Nunavut |
| NTS | 37G/05NW; 37G/05SW |
| Area | Nuluujaak Mountain; Baffin Island |
| Lat/Long WENS | -80.0000 -79.5000 71.5000 71.3297 |
| Subjects | regional geology; stratigraphy; structural geology; paleontology; economic geology; mineralogy; Archean; bedrock geology; structural features; faults; folds; fold geometry; jointing; bedding planes;
lithology; sedimentary rocks; dolostones; limestones; cherts; sandstones; conglomerates; breccias; iron formations; greywackes; igneous rocks; intrusive rocks; diabases; syenites; granodiorites; monzo-granites; granites; monzodiorites; tonalites;
metagabbros; peridotites; pyroxenites; monzonites; volcanic rocks; komatiites; basalts; tuffs; breccias, volcanic; volcanic conglomerates; migmatites; metamorphic rocks; gneisses; amphibolites; serpentinites; schists; paragneisses; metavolcanic
rocks; metabasalts; metasedimentary rocks; metapelites; metagreywackes; quartzites; intrusions; dykes; sills; batholiths; volcanic-sedimentary belts; textures; layering; foliation; lineations; sedimentary structures; facies; mineral deposits; iron;
magnetite; hematite; tectonic history; glacial features; glacial striations; Neoproterozoic; Brodeur Group; Franklin Dykes; Mary River Group; Mary River No. 4 Deposit; Central Borden Fault Zone; geological contacts; outcrops; Phanerozoic; Cenozoic;
Quaternary; Paleozoic; Ordovician; Cambrian; Precambrian; Proterozoic |
| Illustrations | location maps; index maps; photographs |
| Program | GEM2: Geo-mapping for Energy and Minerals Baffin Bedrock Mapping |
| Released | 2021 12 09 |
| Abstract | The map area lies about 40 km northwest of Baffinland's iron mine. Dykes of unit mAnA3 within unit mAnA2 suggest that unit mAnA2 predates unit mAnA3. Unit nAMqf, basal Mary River Group unit, includes
regolith material from units mAnA2 and mAnA3. Unit mAnAm may include some dykes of unit nAMb. The Mary River Group was deposited in a volcanic-arc environment, yielding zircon U-Pb ages mostly in the range of 2.88 to 2.72 Ga. Iron-formation (unit
nAMi) is approximately 276 m thick locally, with oxide facies (unit nAMio) being most abundant. The quartzite triangle west of 'Iron lake' (unofficial name) may be a small horst. The main east-west-trending synclinal fold, including the area around
'Iron lake' and the no. 4 ore deposit, is upright, nearly isoclinal, and plunges mostly easterly at both ends with small scale anticlines and synclines in the middle. Magnetite constitutes about 75% of high-grade iron deposits in the north limb,
whereas hematite predominates in south-limb deposits. K-Ar and Rb-Sr ages indicate middle Paleoproterozoic overprinting. Central Borden Fault Zone was active at ca. 1.27 Ga and during or after Ordovician time.
Note: please be aware that the
information contained in CGM 408 is based on legacy data from the 1960-1990s and that it has been superseded by regional-scale information contained in CGM 403. |
| Summary | (Plain Language Summary, not published)
The area lies about 40 km NW of Baffinland's iron mine. The basal Mary River Group (MRG) includes regolith material from basement lithologies. MRG was
deposited in a volcanic arc environment, yielding mostly 2.72-2.88 Ga zircon U-Pb ages. Iron formation is ca. 276 m thick locally, NAMio-oxide facies, being most abundant. The quartzite triangle west of Iron Lake may be a small horst. The main E-W
fold is upright, nearly isoclinal and plunges mostly easterly at both ends with much folding in the middle. Magnetite comprises ca. 75% of high-grade iron deposits in the north limb, whereas hematite predominates in south-limb deposits. Noted
previously, K-Ar and Rb-Sr ages indicate middle Paleoproterozoic overprinting. Central Borden Fault Zone was active at ca.1.27 Ga and during- or post-Ordovician time. |
| GEOSCAN ID | 314670 |
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