Distribution of Fusulinaceans in the Western Canadian Cordillera

1971 ◽  
Vol 8 (2) ◽  
pp. 259-278 ◽  
Author(s):  
J. W. H. Monger ◽  
C. A. Ross
Keyword(s):  
Volcanic Rocks ◽  
Canadian Cordillera ◽  
Crustal Movements ◽  
Clastic Rocks ◽  
Western Cordillera ◽  
Local Environments ◽  
Upper Paleozoic ◽  
Biogeographic Provinces ◽  
The Family ◽  
Part Time

Fusulinacean faunas in Upper Paleozoic lithological sequences containing volcanic rocks in the western Canadian Cordillera form two assemblages based on geographic association of genera. One assemblage, in Permian strata, is dominated by genera of the family Schwagerinidae and occupies belts in the eastern and western parts of the western Cordillera. This assemblage is associated with brachiopods, bryozoans, horn corals, and crinoids and is in limestones interbedded with clastic rocks and volcanic rocks of variable composition. The other Permian assemblage is dominated by genera of the family Verbeekinidae and occupies a central belt where it occurs with crinoid detritus and algae in thick, regionally extensive limestones associated with cherts, basalt, and ultramafic rocks. The less-well documented Pennsylvanian fusulinaceans appear to occupy similar belts. Because fossils of both assemblages are at least in part time equivalent, their distribution may well be due to differing local environments. In addition, or alternatively, this diversity may be brought about by major crustal movements juxtaposing originally isolated biogeographic provinces.

The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera

1990 ◽  
Vol 27 (3) ◽  
pp. 344-356 ◽  
Author(s):  
J. M. Smith ◽  
P. Erdmer
Keyword(s):  
Country Rock ◽  
Regional Metamorphism ◽  
Volcanic Rocks ◽  
Canadian Cordillera ◽  
South Fork ◽  
Upper Proterozoic ◽  
Tectonic History ◽  
South Central ◽  
Upper Paleozoic ◽  
Peak Metamorphism

The mid-Cretaceous Anvil batholith, in south-central Yukon near Faro, intrudes Upper Proterozoic to upper Paleozoic strata of the Cordilleran outer miogeocline. From previous work, it was unclear whether biotite, andalusite–staurolite, and garnet isograds near the pluton resulted from pre-Devonian regional metamorphism and subsequent arching in a structural culmination or from mid-Cretaceous instrusion. The present study has documented biotite, andalusite, staurolite, garnet, and sillimanite isograds concentric to the pluton. Prophyroblast–matrix relationships indicate that peak metamorphism occurred during intrusion, which took place under approximately 3 kbar (300 MPa) pressure and heated country rock to temperatures of 600°–620 °C. The metamorphism is thus compatible with a deep, mid-Cretaceous event. Regional uplift of 10 km is implied by the metamorphic minerals. From cogenetic relationships between some phases of the Anvil batholith and the nearby South Fork volcanic rocks, regional uplift appears to have been completed in a few million years in the mid-Cretaceous. The uncharacteristic aureole suggests that mid-Cretaceous events in this region are atypical of the Cordillera and may reflect a unique tectonic history or position in the orogen.

Geological and geochemical evidence for variable magmatism and tectonics in the southern Canadian Cordillera: Paleozoic to Jurassic suites, Greenwood, southern British Columbia

2001 ◽  
Vol 38 (1) ◽  
pp. 75-90 ◽  
Author(s):  
J Dostal ◽  
B N Church ◽  
T Hoy
Keyword(s):  
British Columbia ◽  
Middle Triassic ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Deep Ocean ◽  
Island Arc ◽  
Canadian Cordillera ◽  
South Central ◽  
Upper Paleozoic ◽  
Paleozoic Rocks

The Paleozoic and early Mesozoic rocks of the Greenwood mining camp in southern British Columbia are a part of the Quesnel terrane in the eastern part of the Intermontane Belt of the Canadian Cordillera. Upper Paleozoic rocks include the Knob Hill Group composed of oceanic tholeiitic basalts (with (La/Yb)n [Formula: see text] 0.4–1.2), associated with deep ocean sedimentary rocks and serpentinites; the Attwood Group that comprises island-arc tholeiites (with (La/Yb)n [Formula: see text] 1–4 and positive εNd values), clastic sedimentary rocks and limestones; and a unit of oceanic gabbros with (La/Yb)n < 0.5. These lithologically defined units occur as tectonically emplaced slivers of oceanic crust probably produced during the closure of the Slide Mountain basin during the Permian. They are unconformably overlain by Middle Triassic calc-alkaline volcanic and sedimentary rocks of the Brooklyn Group. The Brooklyn Group volcanic rocks have characteristics of mature island-arc rocks, including (La/Yb)n [Formula: see text] 2.5–4.5 and positive εNd values. The Paleozoic rocks are crosscut by a 200 million years old granodioritic intrusion containing zircon with an Early Proterozoic inheritance age (~2.4 Ga). By inference, southern Quesnellia may have been well offshore from the ancestral North American margin in the Mississippian, in close proximity to the margin by the Middle Triassic, and contiguous with it by the Early Jurassic. It is suggested that the complex tectonic history of extension and contraction of the southern Canadian Cordillera during the post Middle Jurassic can be extended in south-central British Columbia as far back as the upper Paleozoic.

scholarly journals PHYSICAL-MECHANICAL PROPERTIES OF METAVOLCANIC ROCKS OF THE MOUNTAIN CRIMEA

2018 ◽  
Vol 13 (4-5) ◽  
pp. 36-51
Author(s):  
J. V. Frolova ◽  
V. V. Ladygin ◽  
E. M. Spiridonov ◽  
G. N. Ovsyannikov
Keyword(s):  
Mechanical Properties ◽  
Magnetic Susceptibility ◽  
Volcanic Rocks ◽  
Low Grade ◽  
Secondary Mineral ◽  
Grade Metamorphism ◽  
Clastic Rocks ◽  
Metavolcanic Rocks ◽  
Physical Density ◽  
Characteristic Values

The article considers the petrogenetic features of the volcanogenic rocks of the Middle Jurassic age of the Mountain Crimea and analyzes their influence on physical (density, porosity, water absorption, and magnetic susceptibility) and physical-mechanical properties (strength, modulus of elasticity, and Poisson's ratio). Among volcanogenic strata there are subvolcanic, effusive and volcanogenic-clastic rocks. All volcanic rocks were altered under the influence of the regional low-grade metamorphism of the zeolite and prehnite-pumpellyite facies, which resulted in a greenstone appearance. Among the secondary mineral the most common are albite, chlorite, quartz, adularia, sericite, calcite, pumpellyite, prenite, zeolites, epidote, sphene, and clay minerals. It is shown that low-grade metamorphism is characterized by heterogenious transformations: there are both slightly modified, practically fresh differences, and fully altered rocks. Tuffs are usually altered to a greater extent than effusive and subvolcanic rocks. In general, effusive and volcanogenic-clastic rocks differ markedly in their physicalmechanical properties, which is due to the peculiarities of their formation: the former are substantially more dense and stronger, less porous and compressible. However, these differences are leveled as a result of intensive changes in mineral composition and porosity in the process of low-grade metamorphism. The most characteristic values of metavolcanite properties were revealed. It is shown that among all studied parameters, the magnetic susceptibility most clearly correlates with the degree of rocks alteration.

Leslie Crombie. 10 June 1923 — 3 August 1999

2001 ◽  
Vol 47 ◽  
pp. 125-140 ◽  
Author(s):  
Gerald Pattenden
Keyword(s):  
World War Ii ◽  
Grammar School ◽  
Legal Practice ◽  
World War ◽  
Isle Of Wight ◽  
School Certificate ◽  
The Family ◽  
Part Time ◽  
The City ◽  
Three Sisters

Leslie Crombie was born in York on 10 June 1923, the second eldest, and only boy, of Walter Crombie and Gladys (née Clarkson). On his father's side his great-grandfather had kept a tobacconist shop in York and his grandfather, George, had founded a prosperous legal practice in the City of York. On his mother's side, Leslie's great–grandfather originated from London and settled in York after helping to build the York Railway Station. Leslie's father qualified as a solicitor and practised law in his grandfather George's office. However, he disliked the profession and, after his marriage and the death of his father, Walter passed over the practice to his brother Norman and took the lease of a hotel in the Isle of Wight. Unfortunately, the hotel did not prosper and was given up after a few years, and the family, which included Leslie's three sisters, Ivy, June and Molly, moved to Portsmouth. Although Leslie's father had a small allowance from his brother Norman and the legal practice in York, and he had various small intermittent incomes from teaching, the family was desperately poor during the 1930s. Leslie received little encouragement from his parents, but he passed the 11+ examination and entered Portsmouth Northern Grammar School in 1934, where he was awarded a very respectable School Certificate when he was 16 years old. However, it was now 1939 and World War II was about to start, and his school was evacuated to Winchester. With poor living conditions and little facilities for study, the young Leslie was determined to take a job and study part-time. He was appointed in 1940 as an assistant in the analytical laboratory of Timothy Whites and Taylor at their head office in Portsmouth under the supervision of Ron Gillham, who greatly influenced his further career; he was paid 13 shillings and 6 pence (in decimal terms, 67½pence) per week. In the evenings, Leslie studied at Portsmouth Municipal College for a London University Intermediate BSc. Alas, after a heavy bombing raid in January 1941, Timothy Whites and Taylor's laboratories were removed from the map, along with a great deal of the centre of Portsmouth—but fortunately not the MunicipalCollege.

A new family of Laniatores (Arachnida:Opiliones) from the Afrotropics

2011 ◽  
Vol 25 (2) ◽  
pp. 143 ◽  
Author(s):  
Prashant P. Sharma ◽  
Carlos E. Prieto ◽  
Gonzalo Giribet
Keyword(s):  
Canary Islands ◽  
Morphological Evidence ◽  
Monotypic Genus ◽  
Sister Relationship ◽  
New Family ◽  
Phylogenetic Studies ◽  
Biogeographic Provinces ◽  
The Family ◽  
Molecular Phylogenetic

Among Opiliones, Afrotropical lineages constitute some of the least studied groups in comparison with those endemic to other biogeographic provinces. Based upon morphological evidence, we erect Pyramidopidae, fam. nov. to distinguish a group of Laniatores from the family Phalangodidae. We review evidence from recent molecular phylogenetic studies that corroborate the independence of Pyramidopidae, fam. nov. from previously described families and support its sister relationship to another largely Afrotropical group, the family Assamiidae. The monotypic genus Maiorerus Rambla, 1993 is transferred to Pyramidopidae, fam. nov. The new family comprises 12 genera geographically restricted to Africa and the adjacent Canary Islands. Interfamilial relationships of the derived Laniatores are discussed in the context of gross and genitalic morphology.

Labour reform will unlock Japan's growth potential

2016 ◽  
Keyword(s):  
Economic Policy ◽  
Family Income ◽  
Growth Potential ◽  
Consumption Tax ◽  
Content Type ◽  
Female Workers ◽  
The Family ◽  
Part Time ◽  
Policy Proposals ◽  
Job Prospects

Subject The Abe government's economic policy. Significance Prime Minister Shinzo Abe has unveiled several extensive economic policy proposals, including a new set of 'three arrows' that was quickly dubbed 'Abenomics 2.0'. Media paid little attention to the new policy proposals, focusing instead on Abe's decision to postpone the consumption tax increase scheduled for next April until October 2019. Impacts Parliament is likely to raise the minimum wage 3% during its next session, with similar rises in the future. Reducing the gap between regular and non-regular workers would transform the labour market, benefiting young, elderly and female workers. Improved job prospects for women would boost fertility by increasing family income and raising women's bargaining power within the family. Extending government welfare schemes to part-time and non-regular workers would add flexibility to labour markets and improve productivity.

Geodynamic evolution of the Canadian Cordillera — progress and problems

1979 ◽  
Vol 16 (3) ◽  
pp. 770-791 ◽  
Author(s):  
J. W. H. Monger ◽  
R. A. Price
Keyword(s):  
Continental Margin ◽  
Middle Jurassic ◽  
Rocky Mountain ◽  
Ocean Basin ◽  
Strike Slip ◽  
Granitic Rocks ◽  
Canadian Cordillera ◽  
Thrust Faulting ◽  
Western Cordillera ◽  
Geophysical Surveys

The present geodynamic pattern of the Canadian Cordillera, the main features of which were probably established in Miocene time, involves a combination of right-hand strike-slip movements on transform faults along the continental margin, and, in the south and extreme north, convergence in subduction zones in which oceanic lithosphere moves beneath the continent, with consequent magmatism along the continental margin. In the southern Canadian Cordillera, geophysical surveys have outlined the subducting slab and the asthenospheric bulge that occurs beneath and behind the magmatic arc. They also show that there is now no root of thickened Precambrian continental crust beneath the tectonically shortened supracrustal strata in the southern parts of the Omineca Crystalline Belt and Rocky Mountain Belt.The Rocky Mountain, Omineca Crystalline, Intermontane, Coast Plutonic, and Insular Belts, the structural and physiographic provinces that dominate the present configuration of the Canadian Cordillera, were established with the initial uplift and the intrusion of granitic rocks in the Omineca Crystalline Belt in Middle and Late Jurassic time and in the Coast Plutonic Complex in Early Cretaceous time, and they dominated patterns of uplift, erosion and deposition through Cretaceous and Paleogene time. Their development may be due to compression with thrust faulting in the eastern Cordillera, and to magmatism that accompanied subduction and to accretion of an exotic terrane, Wrangellia, in the western Cordillera. Major right-lateral strike-slip faulting, which occurred well east of but sub-parallel with the continental margin during Late Cretaceous and Paleogene time, accompanied major tectonic shortening due to thrusting and folding in the Rocky Mountain Belt as well as the main subduction-related (?) magmatism in the Coast Plutonic Complex.The configuration of the western Cordillera prior to late Middle Jurassic time is enigmatic. Late Paleozoic and early Mesozoic volcanogenic strata form a complex collage of volcanic arcs and subduction complexes that was assembled mainly in the Mesozoic. The change in locus of deposition between Upper Triassic and Lower to Middle Jurassic volcanogenic assemblages, and the thrust faulting in the northern Cordillera may record emplacement of another exotic terrane, the Stikine block, in latest Triassic to Middle Jurassic time.The earliest stage in the evolution of the Cordilleran fold belt involved the protracted (1500 to 380 Ma) development of a northeasterly tapering sedimentary wedge that discordantly overlaps Precambrian structures of the cratonic basement. This miogeoclinal wedge may be a continental margin terrace wedge that was prograded into an ocean basin, but it has features that may be more indicative of progradation into a marginal basin in which there was intermittent volcanic activity, than into a stable expanding ocean basin of the Atlantic type.

The Employment Pattern of Professional Couples and Their Distribution of Involvement in the Family

1978 ◽  
Vol 3 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Kathy Weingarten
Keyword(s):  
Family Involvement ◽  
Age Groups ◽  
Full Time ◽  
Employment History ◽  
Family Work ◽  
Employment Patterns ◽  
The Family ◽  
Employment Pattern ◽  
Part Time ◽  
Modes Of Interaction

Thirty-two two-profession couples in three different age groups with children were interviewed together to determine if there was a relationship between their employment pattern and their distribution of family involvement in the home. The couples followed one of two employment patterns: a similar employment history (SEH) in which both people had worked full-time and continuously and a dissimilar employment history (DEH) in which the husband had worked full-time and continuously but the wife had worked part-time. Their involvement in the home was measured by an 80-item interview that covered two modes of interaction in four task areas. Significant differences were found in the ways SEH and DEH couples allocated tasks. Of particular interest was the breakdown of an equitable distribution of tasks in the area of childcare for SEH couples. It was suggested that couples “negotiate” a division of labor that allows women to compensate for the time they spend away from the children and men to choose the family work that is less threatening to their masculine selves.

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