Terrestrial heat flux was measured in fjords, boreholes, and offshore wells at sites across the convergent margin of southwestern British Columbia from continental shelf landward to Garibaldi Volcanic Belt. Temperatures were corrected for drilling disturbances, formation thermal conductivities modeled using measurements on cuttings downhole geophysical logs. Marine fjords large effects refraction as well aperiodic temperature variations bottom waters. There excellent agreement between marine...

A novel application of the tensor controlled source audio‐magnetotelluric (CSAMT) method was part a multidisciplinary geophysical study an existing mine site at Buchans, Newfoundland. The orthogonal components horizontal electromagnetic fields used for magnetotelluric and CSAMT interpretation earth’s conductivity structure were found to be inappropriate Buchans because strong scattering in electric fields. Instead, length major axes magnetic field polarization ellipses vertical as data. data...

Vibroseis seismic reflection data have been recorded to 18 s two-way traveltime along three transects across the island of Newfoundland. The upper crust has both steep and subhorizontal reflectors consistent with a ramp–flat style deformation, whereas middle lower are largely free regional flats. Reflectors descend through ca. 20 km vertical section in flatten into Moho or perhaps cut it places. is interpreted be no younger than dipping reflectors. Reflection fabrics, indicators dominantly...

The heat flow pattern from the deep sea across Queen Charlotte Terrace to west coast of Islands has been determined through 20 marine measurements and by 11 borehole at one land site. There is a continuous transition very high flow, intermediate values on terrace, low continental flow. are scattered, probably reflecting hydrothermal circulation in crust, but their mean agreement with theoretical value for 7 Ma oceanic crust. site 47 mW m −2 similar average Insular Belt south east. 30 km wide...

Sixteen kilometres of high resolution Vibroseis reflection seismic data have been acquired in the vicinity former Buchans mine. Direct identification cause several reflectors is possible because geology tightly constrained by underground workings and drill holes both which locally exceed 1 km depth. Many mine-scale thrust faults are imaged as but conformable intrusive contacts generally responded poorly. A significant shallow-dipping thrust, Powerline Fault, recognized below orebodies traced...

We report heat flow values for ten holes at five sites in Newfoundland. The average observed is 43 ± 4 mW m −2 . Corrected Pleistocene surface temperature variations, the becomes 50 , with a range from 38–82 Dunnage zone (a vestige of Iapetus Ocean) exhibits lower than normal Paleozoic orogenic belts. highest associated Carboniferous St. Lawrence granite intrusion. Heat production measurements were made three sites. Those are low (< 0.8 μW −3 ), as expected former oceanic rocks, while...

Commencing in 1988 and continuing for 5 years, Lithoprobe acquired a series of high-resolution seismic experiments within near base-metal mining camps Canada, including the Abitibi subprovince Quebec Ontario, world-class Sudbury Ni–Cu district, Buchans mine Newfoundland, Thompson Ni belt Manitoba. This work, undertaken close cooperation with Geological Survey Canada major Canadian companies, stimulated an intensive broadened followup studies common objective assessing potential applications...

We consider parametrically forced Hamiltonian systems with one-and-a-half degrees of freedom and study the stability dynamics when frequency forcing is relatively high or low. show that, provided sufficiently high, Kolmogorov-Arnold-Moser (KAM) theorem may be applied even amplitude far away from perturbation regime. A similar result obtained for low frequency, but in that case we need to not too large; however, are still able amplitudes which outside In addition, find numerically stable very...

Abstract The Deer Lake Basin is an entirely non‐marine basin associated with the Cabot fault zone. Structural and stratigraphic evidence strongly suggest dextral strike‐slip movements along zone during Tournaisian‐Visean time. Two elongated, end‐on structural blocks (probable positive flower structures) contain fold axes second‐order faults oriented obliquely to traces bounding blocks, in a manner implying movements. In one part of basin, thickness long homoclinal section later basin‐fill...

We present results from the first major vibroseis seismic reflection survey at a mine site in North America. It is demonstrated that conventional high‐stack fold techniques can image fault structures associated with volcanogenic massive sulfide bodies, despite fact these are locally steeply dipping and produce records low signal‐to‐noise ratios. The new lines were recorded locations of two earlier experimental explosive surveys failed to many strong reflectors. principal reasons for success...

A general survey of geomagnetic induction phenomena in Newfoundland is undertaken. The northeastward extension the 'Atlantic' conductivity anomaly can be traced into southwestern where it lost intense conduction–induction effects due to channeling shallow water electric currents about projecting corner southeastern Newfoundland. Shallow processes Gulf St. Lawrence are better clarified. Evidence presented for a tentative inland eastern geological evidence points an ancient zone subduction.

A nonlinear oscillator is studied in the presence of external forcing for which amplitude initially depends on time. The focus sizes basins attraction do not lead to unbounded motions, collectively termed ‘safe basin’. Direct comparisons are drawn between regime constant and that where In process, questions from previous literature answered previously unexplained phenomena understood. Furthermore, we witness a new phenomenon, observed system studied.

A comparison of induction arrows calculated from analogue model and field station measurements is reported for fifteen locations in the Newfoundland region Atlantic Canada. The made at four periods 100s, 300s, 900s, 1800s. differences between total response as represented by results part due to conductive ocean alone are presented form difference arrows. These representative anomalous conductivity associated with tectonic features region. major structures identified contributing...