Stratigraphy, facies changes, and correlations in the northern Selkirk Mountains, southern Canadian Cordillera

Brown, Richard L.; Tippett, C R; Lane, L S

doi:10.1139/e78-119

Cited by 14 publications

(14 citation statements)

References 11 publications

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“…Thick intervals of pelitic rocks with poorly sorted grit beds in the northern Selkirks (Brown et al 1978) may indicate deposition in somewhat more distal, deeper environments, similar to those of the grit division, which some of them resemble.…”

Section: Depositional Mechanisms and Environmentsmentioning

confidence: 99%

“…Garnet amphibolite masses 300 m thick reported by Simony et al (1980) from the Mica Dam area have coarse homogeneous interior portions and originated most probably as mafic intrusions. Brown et al (1978) reported amphibolite sheets that have discordant, intrusive contacts in the northern Selkirk Mountains.…”

Section: Rogers Pass and Adjacent Selkirk Mountainsmentioning

confidence: 99%

“…20). The semipelite unit was traced to ridges west of the Esplanade Range where it has layers of amphibolite and constitutes the lower part of the lower pelitic member of Brown et al (1978). It was traced by Brown et al (1977) to the northern limit of the Selkirk Mountains and by Ghent et al (1977) to the southern margin of the Malton gneiss in the northern Monashee Mountains.…”

Section: Rogers Pass and Adjacent Selkirk Mountainsmentioning

confidence: 99%

“…interpret the stratigraphy and sedimentology of the The Dogtooth succession has been used already as Hadrynian (Late Precambrian) rocks in the north-a standard succession for correlation and regional ern Dogtooth Mountains (northernmost Purcell mapping by several authors (Simony and Wind Mountains) where structural and metamorphic 1970; Young et al 1973;Brown et al 1978), although it has not yet been described in detail. Correlation of the Hadrynian rocks in the eastern Cordillera of western Canada over long distances remains difficult and uncertain, although their lithologic character and succession are similar in many places (e.g., Gabrielse 1972;Young et al;.…”

Section: Introductionmentioning

confidence: 99%

“…The terminology for the units follows Young et al who, however, implied by it a firmer correlation between the Dogtooth and Cariboo Mountains than we do. Although the successions in the two areas are strikingly similar (Poulton 1970;Young et al;Brown et al 1978), structural and stratigraphic complications between them preclude confident correlation and the possibility exists that more than one recurrent succession of similar lithologies occurs. No similar four-fold subdivision is known in the Horsethief Creek type area (Reesor 1973).…”

Section: Introductionmentioning

confidence: 99%

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Stratigraphy, sedimentology, and regional correlation of the Horsethief Creek Group (Hadrynian, Late Precambrian) in the northern Purcell and Selkirk Mountains, British Columbia

Poulton¹,

Simony²

1980

Can. J. Earth Sci.

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The Hadrynian Horsethief Creek Group in the northernmost Purcell Mountains and adjacent Selkirk Mountains is subdivisible regionally into grit, slate, carbonate, and upper clastic divisions in upward succession. The grit division represents a submarine fan assemblage and the slate division hemipelagic muds probably deposited in intermediate depths. The carbonate division comprises an interval of discontinuous lenses representing "bahamian" carbonate bank and off-bank assemblages, and the upper clastic division is a heterogeneous clastic wedge, which shows some evidence of northerly and westerly increasing depositional depths. Feldspathic quartz pebble conglomerate beds intercalated with the carbonates in both bank and off-bank facies indicate tectonic activation of granitic source areas like those from which similar rocks in the upper part of the Miette Group of the Rocky Mountains were derived.The upper part of the slate division, which can be differentiated in western localities as a distinct semipelite-amphibolite unit, and the upper clastic division each expand in thickness northwestward to dominate the Horsethief Creek outcrops in the Selkirk Mountains. These thickness variations, the increase of amphibolite northward in the semipelite-amphibolite unit, and the loss of grit beds northward in the slate division suggest deposition in a depocentre that received coarse sediment from southerly and easterly directions, and that became the site of mafic igneous activity.Le groupe hadrynien de Horsethief Creek dans la partie extreme nord des monts Purcell et dans les monts Selkirk adjacents peut se subdiviser regionalement en divisions de gres, d'ardoises, de carbonates et une division superieure de clastiques dans une succession vers le haut. La division des gres represente un assemblage de c8ne sousmarin et la division des ardoises des boues hemipelagiques probablement deposees a des profondeurs intermediaires. La division des carbonates comprend un intervalle de lentilles discontinues representant des bancs de carbonates de type "Bahamas" et des assemblages au large des bancs, alors que la division superieure des clastiques comprend un coin clastique heterogene qui donne certaines indications d'un approfondissement des milieux de dep8t vers le nord et I'ouest. Les lits de conglomerats B cailloux de quartz feldspathique intercales avec les carbonates dans les facies de bancs et au large des bancs indiquent une activation tectonique des regions sources granitiques comme c'etait le cas pour les regions sources qui ont alimente les roches semblables de la partie superieure du groupe de Miette dans les Rocheuses.La partie superieure de la division des ardoises, qu'on peut differencier dans les localites situees a l'ouest comme une unite distincte de semipelite-amphibolite, et la division superieure des clastiques augmentent toutes deux en epaisseur vers le nord-ouest pour coiffer les affleurements de Horsethief Creek dans les monts Selkirk. Ces variations d'epaisseur, l'augmentation de I'amphibolite vers le nord dans ...

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Section: Depositional Mechanisms and Environmentsmentioning

confidence: 99%

Section: Rogers Pass and Adjacent Selkirk Mountainsmentioning

confidence: 99%

Section: Rogers Pass and Adjacent Selkirk Mountainsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stratigraphy, sedimentology, and regional correlation of the Horsethief Creek Group (Hadrynian, Late Precambrian) in the northern Purcell and Selkirk Mountains, British Columbia

Poulton¹,

Simony²

1980

Can. J. Earth Sci.

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U–Th–Pb geochronologic constraints on the structural evolution of the Selkirk fan, northern Selkirk Mountains, southern Canadian Cordillera

Gibson

Brown

Carr

2005

Journal of Structural Geology

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Tectonic setting and U‐Pb geochronology of the Early Tertiary Ladybird Leucogranite Suite, Thor‐Odin ‐ Pinnacles Area, Southern Omineca Belt, British Columbia

Carr¹

1992

Tectonics

102

111

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The Thor‐Odin ‐ Pinnacles area is a structural culmination in the Shuswap complex of the southern Omineca Belt of the Canadian Cordillera. It comprises amphibolite‐facies rocks that were deformed during Mesozoic‐Paleocene compression and were exhumed in the footwalls of Eocene normal faults during crustal extension. The Ladybird leucogranite suite coincides with the extended terrane in the southern Omineca Belt. It is generally restricted to a midcrustal level which lies in the hanging walls of deep‐seated thrust faults and the footwalls of extensional faults. Field relationships of the leucogranites and U‐Pb geochronology place timing constraints on compressional and extensional shear zones. The last thrust motion on the Monashee décollement occurred in the latest Paleocene, and the shear zone had stopped by 58 Ma. Crustal‐scale normal faults were active in the early Eocene, indicating that crustal extension closely followed the compressional regime. Geological and geochronological data are consistent with an anatectic crustal origin for the Ladybird granite. The granites apparently postdate the thermal peak of metamorphism (Carr, 1990) and were generated during the final stages of thrusting, perhaps due to decompression melting as the midcrustal rocks were carried up a thrust ramp and unroofed and/or due to the introduction of hydrous fluids into the system. In situ magma and hot intrusions probably played an important role in the nucleation of extensional shear zones. The extensional regime then facilitated the intrusion of vast late‐synkinematic to posttectonic plutons. U‐Pb systematics reveal that zircons in high‐temperature shear zones may have suffered high‐temperature Pb loss, perhaps due to deformation‐ or fluid‐enhanced diffusion, and that monazite systematics from samples from high‐grade terranes are complex. Magmatic monazite populations contain crystals of different ages that do not coincide with zircon ages and apparently represent neither a crystallization age nor a cooling age.

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Stratigraphy, facies changes, and correlations in the northern Selkirk Mountains, southern Canadian Cordillera

Cited by 14 publications

References 11 publications

Stratigraphy, sedimentology, and regional correlation of the Horsethief Creek Group (Hadrynian, Late Precambrian) in the northern Purcell and Selkirk Mountains, British Columbia

Stratigraphy, sedimentology, and regional correlation of the Horsethief Creek Group (Hadrynian, Late Precambrian) in the northern Purcell and Selkirk Mountains, British Columbia

U–Th–Pb geochronologic constraints on the structural evolution of the Selkirk fan, northern Selkirk Mountains, southern Canadian Cordillera

Tectonic setting and U‐Pb geochronology of the Early Tertiary Ladybird Leucogranite Suite, Thor‐Odin ‐ Pinnacles Area, Southern Omineca Belt, British Columbia

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