Structure and Stratigraphy of the Big Bend area, British Columbia

Brown, Richard L.; Perkins, M J; Tippett, C R

doi:10.4095/102700

Cited by 2 publications

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“…Exposures of the Hamill Group above the Horsethief Creek Group die out northwestward within the Big Bend (Brown et al 1977b) but similar rocks of latest Hadrynian to Lower Cambrian age outcrop some 150 km farther northwest in the Cariboo Mountains where dominantly quartzitic rocks of the Yanks Peak Formation and shales of the Midas Formation are conformably overlain by fossiliferous limestones of the Lower Cambrian Mural Formation . Young et al (1973) proposed a correlation of the Yanks Peak Formation, the basal Gog Group, and the Hamill Group that has been generally accepted.…”

Section: Cariboo Mountainsmentioning

confidence: 98%

“…Folds of this generation are strongly overturned toward the northeast adjacent to the Rocky Mountain Trench and become upright to overturned to the southwest as they diminish in intensity in the central part of the Selkirk Mountains. The superposition of these two phases of deformation with opposed sense of overturning has given rise to the Selkirk Fan structure that dominates the geometry of the northern Selkirks (Tippett 1976;Brown et al 1977b;Brown and Tippett 1978).…”

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confidence: 98%

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

Brown¹,

Tippett²,

Lane³

1978

Can. J. Earth Sci.

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The Hadrynian Horsethief Creek Group that underlies much of the northern Selkirk Mountains is divided into three members. The upperpelitic member is overlain by latest Hadrynian to Lower Cambrian rocks of the Hamill Group and is correlated with the Yankee Belle Formation of the Cariboo Group in the Cariboo Mountains to the northwest. The underlying middle marble member is correlated with the Cunningham Formation, and the lowest exposed lower pelitic member with the Isaac Formation.Westward thickening of the Horsethief Creek Group is paralleled by agradational change in the upper pelitic member from a predominantly clastic sequence to the east to a predominantly calcareous sequence to the west. The overlying Hamill Group also changes in character, becoming more pelitic and interdigitating with basaltic metavolcanics toward the west. These facies changes are compatible with results from adjacent areas that point to deposition on a continental shelf in late Proterozoic to early Paleozoic time.Le gt-oupe de Horsethief Creek de 1'Hadrynien qu'on rencontre sous presque toute la partie nord des monts Selkirk se divise en trois membres. Le membre pelitique superieur est recouvert par les roches du groupe de Hamill, fin de 1'Hadrynien jusqu'au Cambrien inferieur, et est correlatif avec la formation de Yankee Belle du groupe de Cariboo dans les monts Cariboo au nord-ouest. Le membre intermediaire compose de marbre est correlatif avec la formation de Cunningham et le mernbre p6litique infkrieur avec la formation d'lsaac.L'Epaississernent i I'ouest du groupe de Horsethief Creek s'xcompagne d'un chanpernent padationnel dans te memhre pelitique supirieur d'une skquence surtout clastique B I'estjusqu'h une sCquence calcareuse B I'ouest. L e s caract6ristiques du groltpe de Hamill susjacent changent aussi pour devenir plus p6litiques et avec interstratification dans les roches basaltiques mCtavolcaniques a I'ouest. Ces changements de facies sont compatibles avec les observations dans fes rkgions adjacentes qui indiquent le dep6t sur une plate-forme continentale I la fin du RotCrozoique ou au debut du Paleozoique.

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Section: Cariboo Mountainsmentioning

confidence: 98%

mentioning

confidence: 98%

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

Brown¹,

Tippett²,

Lane³

1978

Can. J. Earth Sci.

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“…M. Perkins (personal communication, 1978) suggested that the strata described in detail by Brown et al (1977Brown et al ( , 1978 are thick equivalents of only the upper part of the Horsethief Creek Group of the northern Dogtooths, whereas the succession described by Ghent et al (1977) and Simony et al (1980), which includes a marble unit, is stratigraphically lower. Our field work in the Monashee Mountains, southwest of Mica Dam, and in the Rogers Pass area, now demonstrates this relationship, which is illustrated in Fig.…”

Section: Northern Selkirk Mountainsmentioning

confidence: 96%

“…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. It is thus a key marker.…”

Section: Rogers Pass and Adjacent Selkirk Mountainsmentioning

confidence: 99%

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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Structure and Stratigraphy of the Big Bend area, British Columbia

Cited by 2 publications

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

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

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

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