Browsing by Author "Simony, Philip S."
Now showing 1 - 20 of 37
Results Per Page
Sort Options
Item Embargo Amer Lake: an Aphebian fold and thrust complex(1981) Patterson, Judith Gay; Simony, Philip S.Item Open Access Field guide to the geology, metamorphism and tectonics of the Foreland and Omineca belts of SW Alberta and SE British Columbia(2020-10) Pattison, David R.M.; Moynihan, David P.; McFarlane, Christopher R.M.; Simony, Philip S.; Cubley, Joel F.This field guide describes field localities that illuminate the geology, metamorphism and tectonics of the Foreland and Omineca belts of the southern Canadian Cordillera in southwestern Alberta and southeastern British Columbia. The Omineca belt contains the deformational, magmatic and metamorphic record of the Jurassic through Eocene development of this part of the Cordilleran orogen. Calgary, where the field trip starts, is situated just east of the edge of the Cordilleran deformation belt, so the geology of the famous Foreland fold and thrust belt is examined on the way to the Omineca belt. A theme of the field guide is that the structural, magmatic and metamorphic processes that occurred in the Omineca belt were intimately linked to the structural and sedimentary processes occurring at the same time in the Foreland belt. The geological domains covered by the field guide include (from east to west) the Foreland thrust and fold belt, Rocky Mountain Trench, Purcell anticlinorium, Kootenay arc, Quesnel terrane, and two Shuswap-type Cordilleran core complexes, the Valhalla complex and Grand Forks complex. The cities and towns within the geographic area covered by the field guide include (from east to west) Calgary and Banff (both in Alberta) and the following communities in British Columbia: Radium, Cranbrook, Kimberley, Creston, Riondel, Kaslo, Nelson, Salmo, Castlegar, Christina Lake and Grand Forks. The field guide covers all aspects of the geology traversed by the field trip. It comprises ten segments based on a combination of geology and geography. The field trip segments are preceded by an overview of the physiography, present-day geophysics, stratigraphy, magmatism, metamorphism, tectonics, ore deposits and geomorphology of the southern Canadian Cordillera. The field guide comprises 82 Stops, 49 Optional stops and 40 Road logs, and is illustrated with 114 figures comprising maps, diagrams, photographs and photomicrographs. Note: the field guide is large (~228 MB), so it may take some time to download.Item Open Access Geology of Blackwater Ridge, northern Purcell Mountains, eastern British Columbia(2002) Hrudey, Michael G.; Simony, Philip S.Item Embargo Geology of late Proterozoic Miette Group, southern main ranges, Cushing Creek area, B.C.(1984) Carey, J. Anne; Simony, Philip S.Item Open Access Geology of the Allan Creek area, Cariboo Mountains, British Columbia(1988) Currie, Lisel D.; Simony, Philip S.The Allan Creek area is divided into two tectonic domains by the steep north-west/southeast trending, southwest-side-down, post-metamorphic Allan Creek Normal Fault (ACF). Late Proterozoic Horsethief Creek and lower Kaza Group strata on the overturned limb of a phase one nappe, north of the ACF, are juxtaposed against lower and middle Kaza Group strata to the south, which belong to a higher level, upright limb of a phase one nappe. Fabrics on both sides of the fault preserve evidence for two major phases of folding, and north of the ACF there is evidence for a third phase of deformation. The second phase structures control the map pattern. They change in style, regardless of lithology, from isoclinal folds south of the ACF to more open folds north of the ACF. North of the ACF the Camp Creek Fault, which pre-dates the second phase of deformation, separates Horsethief Creek strata from younger, lower Kaza strata. South of the ACF, metamorphic grade increases northeastward from garnet grade to kyanite grade. The metamorphic grade north of the ACF, although still entirely in kyanite zone, is greater than in the south: leucosome is found only north of the ACF and the first appearance of leucosome corresponds with the trace of the ACF. Metamorphic histories differ across the ACF. South of the fault there is evidence for two distinct metamorphic events, whereas strata north of the fault may have experienced one continuous metamorphic event. On both sides of the ACF the peak of metamorphism post-dates the second phase of deformation. Retrogressive minerals are present only south of the ACF. North of the fault peak metamorphic mineral assemblages have been quenched and preserved in textural equilibrium. Pressures and temperatures determined by geobarometry and geothermometry from both sides of the fault (570 and 540 MPa, and 510°c and 540°c south and north of the ACF, respectively) are within error limits of one another, indicating that throw on the ACF may be less than 4 km. Preliminary U-Pb zircon and monazite age determinations of 154+/-6 Ma from a pegmatite that pre-dates phase two deformation, and 125+/-7 Ma from one that post-dates the second phase of deformation, constrain the age of phase two deformation to between 160 and 118 Ma (Late Jurassic to Early Cretaceous). The age of the metamorphic peak is inferred from a 135+/-4 Ma (Early Cretaceous) U-Pb monazite age from a pelite from north of the ACF. Since peak metamorphism post-dated phase two deformation, the age of phase two deformation in the Allan Creek area, north of the ACF, is further constrained to between 165 and 131 Ma. The timing of movement on the ACF post-dates the peak of metamorphism and is therefore later than 140 Ma. It is likely that the ACF formed to accommodate the northward decrease in offset on the Middle -Eocene North Thompson River-Albreda River Normal Fault, and therefore is also of Middle Eocene age.Item Open Access Geology of the Amisk-Welsh Lakes area, Saskatchewan(1990) Wilcox, Kent H.; Simony, Philip S.Item Open Access Geology of the Barkerville-Cariboo River area, central British Columbia(1980) Struik, Lambertus Cornelis; Simony, Philip S.An area lying along a northwest-southeast orogeric trend in the Barkerville-Cariboo River area was mapped at scales of 1:20,000 and 1:50,000. The study was undertaken to determine the internal stratigraphic relationships and to establish possible correlations with the stratigraphy of other areas in the Canadian Cordillera. The hypothesis of a Devona-Mississippian Cariboo Orogeny was tested in the light of stratigraphic and structural data. The Cambro-Hadrynian stratigraphy of Barkerville-Cariboo River is equivalent to that determined by Campbell et al. (1973) for the Cariboo Mountains to the east. This Cambro-Hadrynian shelf sequence and the unconformably overlying Upper Ordovician to Permian rocks are part of the North American Craton. The Ordovician unconformity becomes more pronounced westward, bevelling through Cambrian and into Hadrynian strata. The Ordovician event responsible for this unconformity is here named the Little Diastrophism. Deposition from the Upper Ordovician to the Permian or Triassic is interrupted by a possible Silurian erosional event and several younger hiati. The Ordovician to Permian strata represent primarily, a black shale basin with intermittent shallow-water carbonate developement, a Devonian volcanic and volcaniclastic event and elastic debris flows. An Upper Devonian debris flow, the Guyet conglomerate is deposited into a moderately deep, black shale basin. The conglomerate's composition, internal features and relationship to surrounding rocks do not suggest a local pre-depositional orogeny. The Devona-Mississippian Cariboo Orogeny does not exist as defined by Johnston and Uglow (1926), Sutherland Brown (1957, 1963) and White (1959). The Guyet conglomerate is a "elastic wedge" which may signify distant tectonism. It is suggested that the term Cariboo Diastrophism be applied to such a possible Upper Devonian tectonic event. This Cariboo Diastrophism has no structural manifestation in the Barkerville-Cariboo River area. The Snowshoe Formation is considered to consist of unconformably juxtaposed Kaza Group, Ordovician to Permian strata and rocks younger than the sub-Triassic unconformity. The Antler Formation is in part of Lower Pennsylvanian age and is thrust from the west in at least a portion of the area. The thrusting must be post-Lower Perrnian and is probably post-Upper Triassic. The Antler has suffered the affects of the Columbian Orogeny and was in place prior to the climax of that orogeny. There are four phases of folding, the first three of which are associated with cleavage developement. Only the second phase is pervasive, forming the mesoscopic and macroscopic folds. There are at least four phases of faulting; northeast to southwest thrust; steep reverse and normal; steep, south side down transverse; and northnortheast trending right-lateral strike-slip. The fold and fault phases belong to the Jurassic to Cretaceous Columbian Orogeny. The metamorphism occurred during and just after the major structures. It, too, must then be Columbian. Elliott's (1970) strain measurement technique was computerized and used to analyze the strain of the Guyet conglomerate. A method was devised and partially computerized for determining the strain ellipsoid from strain ellipses measured on three perpendicular planes not parallel to the principal strains.Item Open Access Geology of the Christina Lake area, southeastern British Columbia(1998) Acton, Shannon Lee; Simony, Philip S.Item Open Access Geology of the Delphine Creek area, southeastern British Columbia: implications for the proterozoic and paleozoic development of the cordilleran divergent margin(1987) Root, Kevin Gordon, 1954-; Simony, Philip S.Strati graphic and structural relationships within, and adjacent to, the Delphine Creek area of southeastern British Columbia are consistent with the hypothesis that the Cordilleran divergent margin formed at the western edge of North America following rifting during the Late Proterozoic and continental separation at the approximate start of the Paleozoic (e.g. Stewart, 1972, 1976; Bond and Kominz, 1983). Within the study area, there is evidence for extensional faulting during deposition of the Middle Proterozoic Dutch Creek FormationItem Open Access Geology of the Dogtooth Range, northern Purcell Mountains, British Columbia(1990) Kubli, Thomas E.; Simony, Philip S.Item Open Access Geology of the Mt. Lulu area, southern Cariboo Mountains, British Columbia(1989) Walker, Rick T.; Simony, Philip S.Item Embargo Stratigraphy, structure and metamorphism of Hadrynian strata in the southeastern Cariboo Mountains, B.C.(1984) Pell, Jennifer; Simony, Philip S.Approximately 750 square kilometers of the Southeastern Cariboo Mountains near Thunder River were mapped in detail. The Semipelite-Amphibolite and Middle Marble divisions of the Horsethief Creek Group crop out in that region. They are overlain by the Upper elastic Division of the Horsethief Creek Group which grades upwards into Kaza Group lithologies. The Semipelite-Amphibolite Division is in excess of 500 m thick, with its base not exposed within the study area. The Middle Marble Division varies greatly in thickness, with a maximum thickness of 300 m. Approximately 3800 m of Kaza Group section were measured. The Kaza Group is overlain by slates of the Isaac Formation. Earlier workers correlated the Kaza Group with the basal division of the Horsethief Creek Group and with the Middle Miette Group. In light of the findings in the Thunder River area these correlations cannot all be correct. The Horsethief Creek Group underlies the grits of the Kaza Group. The Kaza Group is still considered correlative with the Middle Miette Group. Shales and carbonates overlie both the Middle Miette and Kaza groups. The strata in the Southeastern Cariboo Mountains were subjected to two major phases of folding during the Jura-Cretaceous Columbian Orogeny. The earliest phase resulted in west facing nappe structures. Fl folds are best developed at deep structural and stratigraphic levels. In the highest stratigraphic units studied there are no Fl folds or Sl schistosity developed. F2 folds are northwest plunging, upright to overturned and characterized by a crenulation cleavage. The F2 folds are conical but can only be recognized as such when mapped for large distances parallel to their trace. Metamorphism in the area ranges from sub-biotite to sillimanite grade. The metamorphic peak is synkinematic with D2. At the sillimanite isograd, sillimanite, kyanite and staurolite all coexist. Pressures and temperatures of 4.7 kb and 530 C were estimated for samples from the sillimanite isograd using garnet-biotite geothermometery and garnet-plagioclase geobarometry. The west-side-down North Thompson River Fault, separates the Cariboo Mountains from the Monashees to the east. Pressures and temperatures of 6.0kb and 655 C were estimated for samples from the sillimanite isograd in the Monashee Mountains. This pressure difference (in excess of 1kb) suggests that there is approximately 4 km of vertical displacement on the North Thompson River Fault.Item Open Access Item Open Access Structural evolution and metamorphism of basement gneisses and hadrynian cover, Bulldog Creek area, British Columbia(1984) McDonough, Michael R.; Simony, Philip S.Item Open Access Structural evolution of the Isaac Lake synclinorium, Cariboo Mountains, British Columbia(1997) Reid, Leslie; Simony, Philip S.Item Open Access Structural geology and stratigraphy of the northern Cariboo Mountains between Isaac Lake and Fraser River, British Columbia(1994) Ferguson, Charles Andrew; Simony, Philip S.Item Metadata only Structural geology of the northern Dogtooth Range, British Columbia(1967) Wind, Gerrit; Simony, Philip S.Item Open Access Structural geology of the Pend d'Oreille area and tectonic evolution of the southern Kootenay Arc(1994) Einarsen, Jon Marion; Simony, Philip S.Structural and stratigraphic boundaries between late Paleozoic and early Mesozoic oceanic assemblages, the early Paleozoic North American outer continental margin, and the late Proterozoic to early Paleozoic North American miogeocline are preserved in the southern Kootenay Arc of southeastern British Columbia, in the Pend d'Oreille River area. This dissertation provides the first detailed interpretation of the structural and tectonic evolution of the southern Kootenay Arc. In the Pend d'Oreille River area the oceanic and outer continental margin assemblages are condensed against the North American miogeocline by the Waneta, Tillicum Creek and Argillite faults. All of these faults are margin-ward verging thrust faults, which are overturned at high structural levels. Mapping conducted during this study suggests that some of the Cambrian metasedimentary rocks in the hangingwall of the Argillite fault, previously mapped as Laib Formation, are laterally continuous, and correlative, to the Index Formation of the Lardeau Group. The recognition of Index Formation rocks within the study area provides the basis for the first regional structural interpretation of the southern Kootenay Arc. In addition, an erosional unconformity at the top of the Index Formation was identified during this study, indicating that a pre-Mississippian deformational event affected the North American outer continental margin in the Pend d' Oreille River area. The Argillite fault is herein interpreted to be a segment of a thrust fault that extends the length of the southern Kootenay Arc. The complete structure is described in this dissertation, and is referred to as the Kootenay Thrust. The Kootenay Thrust is a craton-ward verging thrust fault, overturned at high structural levels, that carried an island arc assemblage, marginal basin assemblages, and the lower Paleozoic outer continental margin assemblage in its hangingwall over lower to middle Paleozoic miogeoclinal stratigraphy in its footwall. This dissertation provides the first whole-rock major, trace, rare earth element, and Rb/Sr analyses of two Cretaceous stocks, and the first whole-rock major and trace element analyses of Paleozoic metabasite rocks in the Pend d' Oreille River area.Item Embargo Structure and metamorphism of precambrian basement and its cover in the Mount Blackman area, British Columbia(1982) Oke, Christopher; Simony, Philip S.Item Embargo Structure and petrology of the malton gneiss complex(1982) Morrison, Michael L.; Simony, Philip S.