The Catamaran Fault, North-Central New Brunswick

1972 ◽  
Vol 9 (10) ◽  
pp. 1278-1286 ◽  
Author(s):  
F. D. Anderson
Keyword(s):  
New Brunswick ◽  
Compressive Stress ◽  
Middle Devonian ◽  
Fracture Analysis ◽  
Strike Slip ◽  
Maritime Provinces ◽  
North Central ◽  
The Core ◽  
Principal Compressive Stress ◽  
Metamorphic Core

The Catamaran Fault cuts pre-Carboniferous rocks of the Miramichi Geanticline in north-central New Brunswick. It has been examined for about 60 miles (100 km) across the intrusive and metamorphic core of the geanticline and into the Siluro-Devonian flank rocks. The fault strikes easterly in the core and northeasterly in the flanks.Where displacement could be determined movement on the fault is mainly right lateral strike-slip. There is no evidence for major dip-slip. Fracture analysis indicates that faulting was in response to a northwest-southeast trending principal compressive stress similar to that deduced for other faults in the Maritime Provinces. Latest movement along the fault was post-Middle Devonian (i.e. post-dates the emplacement of the Acadian granite) and pre-Pennsylvanian.The Catamaran Fault may extend eastward along a fault possibly underlying Miramichi Bay and continuing under the Gulf of St. Lawrence, and westward along a southwesterly trending fault in western New Brunswick. As such the Catamaran Fault may exceed 250 miles (400 km) in length.

The Finite Element Analysis on the Local Compression of the Concrete Filled Steel Tubular Column-Beam Joint

2011 ◽  
Vol 368-373 ◽  
pp. 489-494 ◽  
Author(s):  
Xu Lin Tang ◽  
Jian Cai ◽  
Qing Jun Chen ◽  
An He ◽  
Chun Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compressive Stress ◽  
Element Analysis ◽  
Joint Zone ◽  
The Core ◽  
Principal Compressive Stress ◽  
The Finite Element Analysis ◽  
Side Face ◽  
Core Concrete

In order to study the mechanical behavior of the joint between concrete filled steel tubular column and beam with discontinuous column tube at the joint zone under axial pressure, the finite element analysis software ANSYS is adopted for parametric analysis and the analysis results are compared with experimental ones. The principal compressive stress is mainly transmitted by the inside area of the joint which is subjected to local compression if it is low, but extends to more outside areas of the joint if it is high. The radial compressive stress, which is the confined stress of the ring beam to the core concrete of the joint, keeps the same as that the width of the ring beam equal to the diameter of the core area of the joint. The vertical strain on the edge of the joint, which would lead to horizontal annular cracks in the side face of the ring beam, changes from tension in the whole height to tension only in the top part and compression in the lower part of the joint, which is consistent with the experimental phenomenon.

Fabric Variation in the Lubec–Belleisle Zone of Southern New Brunswick

1973 ◽  
Vol 10 (11) ◽  
pp. 1591-1599 ◽  
Author(s):  
John A. Garnett ◽  
Richard L. Brown
Keyword(s):  
New Brunswick ◽  
Middle Devonian ◽  
Finite Strain ◽  
Horizontal Displacement ◽  
Strike Slip ◽  
Finite Strains ◽  
Structural Fabric ◽  
Major Strike

Variations in structural fabric adjacent to part of the Lubec–Belleisle fault are interpreted in terms of a single protracted heterogeneous strain. Zones of shallow and intermediate pitch of lineation in steep to vertical surfaces occur between a region of steeply pitching lineations and a region of unstrained rock. Finite strain in the zone of steeply pitching lineations is greater than in the intermediate or shallow pitching zones. The variation in magnitude and orientation of the finite strains is probably due to a buttressing effect of adjacent unstrained granitic rocks.The fabric zones formed in Middle Devonian times, and predate brittle movement of the Lubec–Belleisle fault. Since the zones do not display appreciable horizontal displacement, the possibility of major strike-slip movements along this fault must be ruled out.

Paleophycology of Long Lake, Saint John County, New Brunswick, Canada, based on diatom distribution in sediments

1992 ◽  
Vol 70 (2) ◽  
pp. 229-239 ◽  
Author(s):  
David J. Rawlence
Keyword(s):  
New Brunswick ◽  
Younger Dryas ◽  
Maritime Provinces ◽  
Eastern Canada ◽  
Mineral Layer ◽  
Climatic Oscillation ◽  
The Core ◽  
Asterionella Formosa ◽  
Diatom Communities ◽  
Climatic Cooling

The succession of postglacial diatom communities was determined in a 5.98 m core from Long Lake, New Brunswick, Canada. The base of the core was dated at 12 200 ± 150 BP. Five major communities were identified: (zone A) from the base to 520 cm, a pioneer Fragilaria/Cyclotella association; (zone B) from 520 to 380 cm, commencing ca. 10 000 BP, a Melosira ambigua/Synedra ulna/Cyclotella/Asterionella community; (zone C) from 380 to 260 cm, a Fragilaria pinnata/Cyclotella pseudostelligera/Tabellaria flocculosa community; (zone D) from 260 to 80 cm, an Asterionella formosa/Cyclotella pseudostelligera/Fragilaria pinnata/Tabellaria flocculosa v. flocculosa community; followed by (zone E) in the upper 80 cm, an Asterionella formosa/Cyclotella meneghiniana/Fragilaria pinnata/Cyclotella pseudostelligera community corresponding with the period of the modern spruce–hardwood community on land. The period of greatest change in the limnic community (zone D) appears to correspond to the period of greatest change in the terrestrial flora, and the mid Holocene Hypsithermal warm peak. The Younger Dryas climatic cooling (ca. 11 000 – 10 000 BP) is preceded by the development of a Fragilaria pinnata/Fragilaria construens/Cyclotella stelligera community, followed by an Ellerbeckia arenaria v. teres biozone, although the Younger Dryas sediments are actually devoid of diatoms. There is evidence of some climatic oscillation following the Younger Dryas period, and some evidence that the climatic cooling began prior to deposition of the mineral layer widely associated with the Younger Dryas throughout the Maritime Provinces of Canada. Key words: paleophycology, diatoms, Younger Dryas, eastern Canada.

Deformation history in part of the Lubec–Belleisle zone of southern New Brunswick

1970 ◽  
Vol 7 (3) ◽  
pp. 748-767 ◽  
Author(s):  
R. L. Brown ◽  
H. Helmstaedt
Keyword(s):  
New Brunswick ◽  
Middle Devonian ◽  
Maximum Principal Stress ◽  
Upper Devonian ◽  
Second Phase ◽  
Lower Carboniferous ◽  
The North ◽  
Principal Compressive Stress ◽  
Two Phases ◽  
Paleozoic Rocks

Rocks of the Proterozoic Coldbrook Group on the north shore of the Bay of Fundy, New Brunswick, are bounded to the north by a major northeast trending fault (Lubec–Belleisle). North of the fault Paleozoic rocks of the Mascarene Group are overlain unconformably by Upper Devonian and Lower Carboniferous strata.Both the Coldbrook and Mascarene Groups have been deformed by three phases of deformation. Deformation of the two Groups was coeval; penetrative fabrics first developed during the Acadian (Middle Devonian) orogeny.Pre-Acadian Paleozoic movements were limited to local or regional uplift with possible attendant warping and/or gentle tilting.Mylonitic fabrics formed in Coldbrook rocks during the first two phases of the Acadian polyphase deformation. These northeast trending s- surfaces lie normal to the direction of maximum finite shortening. Also from the orientation of synmylonization quartz deformation lamellae of the second phase, it is apparent that the local trajectory of the maximum principal stress was normal to the s-surfaces of the mylonites.No evidence for major northeast–southwest strike slip faulting has been found. Fracture analyses in Upper Devonian and Lower Carboniferous rocks in the northeast trending fault zone, point to a northwest trending principal compressive stress.It is contended that the bulk of the ductile strain (first two phases) occurred In response to northwest principal compressive stress during the Middle Devonian, and these stresses were re-established in post-Devonian times, resulting in the development of high angle oblique to dip slip movements on the northeast trending faults.

Organochlorine Residues in Brook Trout and Yellow Perch From New Brunswick and Nova Scotia (Canada) Lakes

1987 ◽  
Vol 22 (3) ◽  
pp. 352-364
Author(s):  
R. Peterson ◽  
S. Ray
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Brook Trout ◽  
Yellow Perch ◽  
Intensive Agriculture ◽  
Fish Tissues ◽  
North Central ◽  
Ddt Metabolites ◽  
Headwater Lakes

Abstract Brook trout and yellow perch collected while surveying New Brunswick and Nova Scotia headwater lakes were analyzed for DDT metabolites, chlordane, hexacyclohexane isomers, hexachlorobenzene, toxaphene and PCB’s. Concentrations of DDT metabolites were much higher from fish taken from lakes in north-central N.B. (200-700 ng/g wet wt) than from fish taken elsewhere (<10 ng/g). Seventy to 90% of the DDT metabolites was DDE. Chlordane (3-13 ng/g) was analyzed in seven trout, six of them from central N.B. areas with intensive agriculture. Isomers of hexachlorocyclohexane were in highest concentration from north-central N.B. (10-20 ng/g), eastern N.S. (5-15 ng/g) and southern N.B. (5-20 ng/g). In most cases, alpha-hexachlorocyclohexane (lindane) was the isomer in highest concentration. Concentrations of hexachlorobenzene in fish tissues was highly variable with no obvious geographic bias. PCB’s were detected in very few fish, and no toxaphene was detected.

Acadian strike-slip tectonics in the Gaspé region, Quebec Appalachians

1989 ◽  
Vol 26 (9) ◽  
pp. 1764-1777 ◽  
Author(s):  
Michel Malo ◽  
Jacques Béland
Keyword(s):  
Middle Devonian ◽  
High Strain ◽  
Structural Features ◽  
Fault Zones ◽  
Strike Slip ◽  
Structural Units ◽  
Middle Ordovician ◽  
Southern Margin ◽  
Intense Deformation ◽  
Dextral Strike Slip

At the southern margin of the Cambro-Ordovician Humber Zone in the Quebec Appalachians, on Gaspé Peninsula, three structural units of Middle Ordovician to Middle Devonian cover rocks of the Gaspé Belt are in large part bounded by long, straight longitudinal faults. In one of these units, the Aroostook–Percé anticlinorium, several structural features, which can be ascribed to Acadian deformation, are controlled by three subparallel, dextral, strike-slip longitudinal faults: Grande Rivière, Grand Pabos, and Rivière Garin. These faults follow bands of intense deformation, contrasting with the mildly to moderately deformed intervals that separate them.Most of the structural features observed – rotated oblique folds and cleavage, subsidiary Riedel and tension faults, and offsets of markers – can be integrated in a model of strike-slip tectonics that operated in ductile–brittle conditions. A late increment of deformation in the form of conjugate cleavages and minor faults is restricted to the bands of high strain. An anticlockwise transection of the synfolding cleavage in relation to the oblique hinges may be a feature of the rotational deformation.The combined dextral strike slip that can be measured within the three major longitudinal fault zones amounts to 138 km, to which can be added 17 km of ductile movement in the intervals, for a total of 155 km.

Structural and geochronological constraints on the role of partial melting during the formation of the Shuswap metamorphic core complex at the latitude of the Thor-Odin dome, British Columbia

1999 ◽  
Vol 36 (6) ◽  
pp. 917-943 ◽  
Author(s):  
Olivier Vanderhaeghe ◽  
Christian Teyssier ◽  
Richard Wysoczanski
Keyword(s):  
Partial Melting ◽  
Metamorphic Core Complex ◽  
High Grade ◽  
Core Complex ◽  
Genetic Link ◽  
The Core ◽  
Lower Unit ◽  
Geochronological Constraints ◽  
Metamorphic Core ◽  
Middle Unit

At the latitude of the Thor-Odin dome, the Shuswap metamorphic core complex exposes a ~15 km thick structural section composed of an upper unit that preserved Mesozoic metamorphism, structures, and cooling ages, separated from the underlying high-grade rocks by low-angle detachment zones. Below the detachments, the core of the complex consists of an amphibolite-facies middle unit overlying a migmatitic lower unit exposed in the core of the Thor-Odin dome. Combined structural and super high resolution ion microprobe (SHRIMP) U-Pb geochronology studies indicate that the pervasive shallowly dipping foliation and east-west lineation developed in the presence of melt during Paleocene time. SHRIMP analyses of complexly zoned zircon grains suggest that the migmatites of the lower unit crystallized at ~56 Ma, and a syntectonic leucogranite at ~60 Ma. We suggest that leucogranite migrated upward from the migmatites through an array of dikes and sills that permeated the middle unit and ponded to form laccoliths spatially related to the detachment zones. The similarity in ages of inherited zircon cores in the two migmatite and the leucogranite samples suggests a genetic link consistent with the structural analysis. Following the crystallization of migmatites, the terrane cooled rapidly, as indicated by argon thermochronology. We propose that exhumation of the core of the Canadian Cordillera during the formation of the Shuswap metamorphic core complex occurred from ~60 to 56 Ma at a time when the crust was significantly partially molten. These structural and temporal relationships suggest a genetic link between mechanical weakening of the crust by partial melting, late-orogenic collapse, and exhumation of high-grade rocks in the hinterland of a thermally mature orogenic belt.

scholarly journals A revision of Annularia and Asterophyllites species from the lower Westphalian (Middle Pennsylvanian) of the Maritime Provinces of Canada

2017 ◽  
Vol 53 ◽  
pp. 017-062 ◽  
Author(s):  
Carmen Álvarez-Vázquez ◽  
Robert H. Wagner
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Western Europe ◽  
Maritime Provinces ◽  
Geographic Ranges ◽  
European Literature ◽  
Scant Attention ◽  
Identical Composition

As part of a larger project to revise the systematics of lower Westphalian floras of Nova Scotia and New Brunswick, the sphenopsid taxa are presently reviewed. We recognize 15 species, of which one, Annularia stopesiae, is new. Detailed synonymy lists allow a refinement of the stratigraphic and geographic ranges of these species. Scant attention has been paid previously to Canadian species in the European literature. For example, Annularia latifolia was described later from Europe as Annularia jongmansii. The identical composition of Westphalian floras from Canada and western Europe is striking.

scholarly journals First Report of Butternut Canker Caused by Sirococcus clavigignenti-juglandacearum in New Brunswick, Canada

Plant Disease ◽  
1998 ◽  
Vol 82 (11) ◽  
pp. 1282-1282 ◽  
Author(s):  
K. J. Harrison ◽  
J. E. Hurley ◽  
M. E. Ostry
Keyword(s):  
New Brunswick ◽  
Prince Edward Island ◽  
Stem Canker ◽  
Culture Collection ◽  
Maritime Provinces ◽  
Natural Range ◽  
Young Branch ◽  
First Time ◽  
Branch Canker ◽  
Butternut Canker

In June 1997, butternut canker was found for the first time in New Brunswick, Canada, at Stickney, Carleton County. A fungal isolate recovered from a young branch canker on butternut (Juglans cinerea L.), cultured on potato dextrose agar, produced spores and cultural morphology as previously described (1). This strain was retained as FSC-758 in the Fredericton Stock Culture Collection at the Atlantic Forestry Centre. The disease was also detected at four other locations in Carleton County along the Saint John River watershed within 20 km of the State of Maine. One stem canker examined at Peel, Carleton County, suggests the disease has been present at this site in New Brunswick for at least 7 years. The butternut tree is at the northeastern edge of its natural range in New Brunswick and, prior to the pathogen's detection, was believed to be far enough from infected butternut in the northeastern United States, Ontario, and Quebec to escape infection. Because planted specimens of butternut exist outside the tree's natural range in New Brunswick and in the neighboring provinces of Nova Scotia and Prince Edward Island, efforts are underway to determine how far the fungus has spread in the Maritime Provinces. Reference: (1) V. M. G. Nair et al. Mycologia 71:641, 1979.

Establishing past environmental conditions and tracking long-term environmental change in the Canadian Maritime provinces using lake sediments

2013 ◽  
Vol 21 (1) ◽  
pp. 15-27 ◽  
Author(s):  
Jennifer B. Korosi ◽  
Brian K. Ginn ◽  
Brian F. Cumming ◽  
John P. Smol
Keyword(s):  
Nova Scotia ◽  
Surface Water ◽  
Environmental Change ◽  
New Brunswick ◽  
Water Acidification ◽  
Maritime Provinces ◽  
Freshwater Resources ◽  
Anthropogenic Stressors ◽  
Surface Water Acidification

Freshwater lakes in the Canadian Maritime provinces have been detrimentally influenced by multiple, often synergistic, anthropogenically-sourced environmental stressors. These include surface-water acidification (and a subsequent decrease in calcium loading to lakes); increased nutrient inputs; watershed development; invasive species; and climate change. While detailed studies of these stressors are often hindered by a lack of predisturbance monitoring information; in many cases, these missing data can be determined using paleolimnological techniques, along with inferences on the full extent of environmental change (and natural variability), the timing of changes, and linkages to probable causes for change. As freshwater resources are important for fisheries, agriculture, municipal drinking water, and recreational activities, among others, understanding long-term ecological changes in response to anthropogenic stressors is critical. To assess the impacts of the major water-quality issues facing freshwater resources in this ecologically significant region, a large number of paleolimnological studies have recently been conducted in Nova Scotia and southern New Brunswick. These studies showed that several lakes in southwestern Nova Scotia, especially those in Kejimkujik National Park, have undergone surface-water acidification (mean decline of 0.5 pH units) in response to local-source SO2 emissions and the long-range transport of airborne pollutants. There has been no measureable chemical or biological recovery since emission restrictions were enacted. Lakewater calcium (Ca) decline, a recently recognized environmental stressor that is inextricably linked to acidification, has negatively affected the keystone zooplankter Daphnia in at least two lakes in Nova Scotia (and likely more), with critical implications for aquatic food webs. A consistent pattern of increasing planktonic diatoms and scaled chrysophytes was observed in lakes across Nova Scotia and New Brunswick, suggesting that the strength and duration of lake thermal stratification has increased since pre-industrial times in response to warming temperatures (∼1.5 °C since 1870). These include three lakes near Bridgewater, Nova Scotia, that are among the last known habitat for critically endangered Atlantic whitefish (Coregonus huntsmani). Overall, these studies suggest that aquatic ecosystems in the Maritime Provinces are being affected by multiple anthropogenic stressors and paleolimnology can be effective for inferring the ecological implications of these stressors.

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