The Lyngen Magmatic Complex; A cross‐section from a major oceanic shear zone, through layered sequences, to high‐level gabbros and pillow lavas

GFF ◽  
1996 ◽  
Vol 118 (sup004) ◽  
pp. 39-40
Author(s):  
A.J. Kvassnes ◽  
H. Furnes
Keyword(s):  
Shear Zone ◽  
Cross Section ◽  
Magmatic Complex ◽  
Pillow Lavas ◽  
High Level

scholarly journals Deep resistivity imaging across the Northern and Central belts of the Southern Uplands

1995 ◽  
Vol 132 (5) ◽  
pp. 531-538 ◽  
Author(s):  
David Beamish
Keyword(s):  
Shear Zone ◽  
Cross Section ◽  
Depth Range ◽  
Magnetotelluric Data ◽  
Resistivity Imaging ◽  
Lower Palaeozoic

AbstractMagnetotelluric data from 16 soundings have provided a northwest-southeast traverse across the Northern and Central belts of the Southern Uplands. The 34 km profile extends from the Ordovician Portpatrick Formation (northwest of the Thornhill Basin) across the Silurian Gala Group onto the Permian Lochmaben Basin in the southeast. The survey traverses, and has particular relevance to, the Ordovician/Silurian boundary (Orlock Bridge Fault), the associated Moniaive Shear Zone, and the Moffat Valley Lineament. The data obtained have been successfully modelled (inverted) to provide a crustal-scale resistivity cross-section. The two Upper Palaeozoic basins are resolved as relatively conducting features. Basin depths are about 200 m (Thornhill) and 1100 m (Lochmaben). Elsewhere, through the upper crustal interval, resistivities over 500 ohm m are associated with the Lower Palaeozoic greywackes. The Silurian formations appear more resistive (and slightly thicker) than their Ordovician counterparts. Depth to basement (base Lower Palaeozoic) is not a well-resolved characteristic but resistivity gradients observed below 5 km suggest a depth of this order. Concealed beneath the Thornhill Basin lie two narrow, vertical, conductive zones. The more substantial feature lies towards the northwest margin of the basin, and is probably associated with the Orlock Bridge Fault. The second zone lies towards the southeast margin of the basin. The conductivity minima, in both cases, are located in the depth range 2 to 3 km; they are separate and distinct from the overlying basin sediments. If the two anomalies, some 5 to 6 km apart, can be considered an expression of the Moniaive Shear Zone, then the major conductive constituents are concentrated at the margins. Two dipping, resistive features in the upper kilometre are imaged in the vicinity of the Moffat Valley Lineament.

Mineralogy and textural relationships of ores from the Whalesback Mine, northeastern Newfoundland

1968 ◽  
Vol 5 (6) ◽  
pp. 1387-1395 ◽  
Author(s):  
K. Kanehira ◽  
D. Bachinski
Keyword(s):  
Shear Zone ◽  
Volcanic Rocks ◽  
Sulfide Deposit ◽  
Ore Formation ◽  
Pillow Lavas ◽  
Bay Area ◽  
Internal Reaction ◽  
Sulfide Ore ◽  
Ore Minerals ◽  
Pressure Shadow

The Whalesback Mine is one of many copper deposits associated with Ordovician volcanic rocks in the Notre Dame Bay area, Newfoundland. The deposit consists of veins, pods, and disseminated sulfides localized within a highly chloritized shear zone cutting basaltic pillow lavas. Porphyritic dikes cut the shear zone, sulfide deposit, and the surrounding pillow lavas; all of the rocks, including the sulfide-rich rocks, have been regionally metamorphosed. Ore minerals, in decreasing order of abundance, include pyrite, chalcopyrite, pyrrhotite, sphalerite, mackinawite, pentlandite, magnetite, cubanite, galena, and ilmenite. Marcasite, covellite, and goethite are supergene minerals. Chlorite and quartz are the predominant gangue minerals. Muscovite, carbonates, sphene, albite, and epidote are minor constituents. Banding and streaking of sulfides in massive ores, crushed pyrite, and the local occurrence of pressure-shadow phenomena in the ore are indicative of shearing stress post-dating original sulfide ore formation. Present sulfide assemblages are compatible with relatively low temperatures and are the result of re-equilibration and internal reaction among the sulfides with decreasing temperature.

Mélange within subduction–accretion complex rocks of Fredriksen Island, South Orkney Islands

1983 ◽  
Vol 120 (6) ◽  
pp. 555-566 ◽  
Author(s):  
B. C. Storey ◽  
A. W. Meneilly
Keyword(s):  
Shear Zone ◽  
Continental Margin ◽  
Pillow Lava ◽  
Orkney Islands ◽  
Pacific Side ◽  
South Orkney Islands ◽  
High Level ◽  
Trench Slope ◽  
The Western Pacific ◽  
Floor Material

Summary. A m´lange on Fredriksen Island, South Orkney Islands, is part of a Mesozoic subduction- accretion complex which formed along the western, Pacific side of Gondwana. It consists of a chaotic arrangement of irregular sized blocks, up to 8 m across, of basic pillow lava, chert, felsite and epiclastic sandstone in a pervasively sheared cataclastic matrix. Inclusions are typically lozenge-shaped and are characteristic of a tectonic m´lange. As the m´lange incorporates both possible ocean floor material that was accreted on to the continental margin and inner slope basin sediments it probably formed beneath the trench-slope basin along a shear zone at a high level in the subduction complex.

scholarly journals LAVA DOME CHANGES DETECTION AT AGUNG MOUNTAIN DURING HIGH LEVEL OF VOLCANIC ACTIVITY USING UAV PHOTOGRAMMETRY

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 173-179 ◽  
Author(s):  
R. Andaru ◽  
J.-Y. Rau
Keyword(s):  
Cross Section ◽  
Volcanic Activity ◽  
Lava Dome ◽  
Point Clouds ◽  
Data Set ◽  
Section Profile ◽  
Changes Detection ◽  
Uav Images ◽  
Cross Section Profile ◽  
High Level

<p><strong>Abstract.</strong> Lava dome changes detection during increasingly high volcanic activity are essential for hazard assessment purposes. However, it is challenging to conduct direct field measurement due to safety reason. Here, we investigate the lava dome changes of Mount Agung in Indonesia during the highest level of volcanic activity. On 22 September 2017, the rumbling and seismic activity in this volcano started increasing to the highest level for a period of time. We afterwards collected image data at lava dome area by using UAV over this time period. To accomplish the goal of change detection, we assembled and developed a fixed-wing UAV platform, i.e. Buffalo FX-79 to acquire images of Mount Agung whose elevation is roughly 3,142&amp;thinsp;m above sea level. We acquired the UAV images on two dates, i.e. Oct 19 and Oct 21 of 2017. Due to an exclusion zone surround the volcano, we could only operate the UAV at 20&amp;thinsp;km distance from the crater. With these data set, we produced three-dimensional point clouds, high-resolution Digital Elevation Model and orthophoto by using Structure from Motion (SfM) and Multi View Stereo (SfM-MVS) technique with Photoscan Pro software. From orthophoto data, we found two fluid areas at the crater's surface in NE direction (4,375.9&amp;thinsp;sq-m) and SE direction (3,749.8&amp;thinsp;sq-m). We also detected a fumarole which emitted steam and gases in the eastern part that continued for several days. In order to reveal the changes in lava dome surface, we used DEM to create cross-section profile. After that, we applied cloud to cloud comparison (C2C) algorithm to calculate the difference of lava dome based on two data set of point clouds and compared it with interferometric result from Sentinel-1A data. The data from the Sentinel-1A satellite (15 Oct &amp;ndash; 27 Oct 2017) were processed to obtain the interferogram image of Mount Agung. This research therefore demonstrates a potential method to detect lava dome changes during high level of volcanic activity with photogrammetric methods by using UAV images. Within only two days the data were successfully acquired. From the DEM data and cross-section profile between two data set, we noticed that no significant surface change was found around the lava dome surface. Moreover, we also found that there was no significant lava dome changes and vertical displacement during these two time periods as the point cloud comparison and distance result. The average of difference distance is 2.27&amp;thinsp;cm with a maximal and minimal displacement of 255&amp;thinsp;cm and 0.37&amp;thinsp;cm respectively. This result was then validated by using InSAR Sentinel that showed small displacement, i.e 6.88&amp;thinsp;cm. It indicated that UAV photogrammetry showed a good performance to detect surface changes in centimeter fraction.</p>

scholarly journals Calculation of harmonic losses and ampacity in low-voltage power cables when used for feeding large LED lighting loads

2014 ◽  
Vol 3 (1) ◽  
pp. 50 ◽  
Author(s):  
N. J. Milardovich ◽  
L. Prevosto ◽  
M. A. Lara
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Low Voltage ◽  
High Harmonic ◽  
Frequency Domain Analysis ◽  
Element Analysis ◽  
Lighting Loads ◽  
Emission Limits ◽  
Phase Conductors ◽  
High Level

A numerical investigation on the harmonic disturbances in low-voltage cables feeding large LED loads is reported. A frequency domain analysis on several commercially-available LEDs was performed to investigate the signature of the harmonic current injected into the power system. Four-core cables and four single-core cable arrangements (three phases and neutral) of small, medium, and large conductor cross sections, with the neutral conductor cross section approximately equal to the half of the phase conductors, were examined. The cables were modelled by using electromagnetic finite-element analysis software. High harmonic power losses (up to 2.5 times the value corresponding to an undistorted current of the same rms value of the first harmonic of the LED current) were found. A generalized ampacity model was employed for re-rating the cables. It was found that the cross section of the neutral conductor plays an important role in the derating of the cable ampacity due to the presence of a high-level of triplen harmonics in the distorted current. The ampacity of the cables should be derated by about 40 %, almost independent of the conductor cross sections. The calculation have shown that an incoming widespread use of LED lamps in lighting could create significant additional harmonic losses in the supplying low-voltage lines, and thus more severely harmonic emission limits should be defined for LED lamps.

scholarly journals 1. The Acting Student’s Choreographic Training. Several Cognitive Objectives

2018 ◽  
Vol 15 (1) ◽  
pp. 110-126
Author(s):  
Petre Șușu ◽  
Carmen Mihaela Crețu ◽  
Aurelian Bălăiță
Keyword(s):  
Higher Education ◽  
Cross Section ◽  
Qualitative Methodology ◽  
Education Institution ◽  
Artistic Expression ◽  
Training Level ◽  
Structured Interviews ◽  
Universal Language ◽  
The One ◽  
High Level

Abstract Dance is an artistic genre that is more and more frequently used in theatre productions. The syncretism of theatre and dance can take many shapes, from inserting dance sequences in dramatic performances, to new artistic genres, such as dance theatre. Due to the fact that they offer manifold innovating possibilities for artistic expression in a greatly audience-oriented universal language, theatrical forms that include dance, and especially the artistic genre of dance theatre are increasingly often put on stage by directors who work in Romania. Thus, training actors in the area of dance at a high level of performance that allows them to approach these types of syncretic artistic genres becomes a priority for the Romanian theatre school. The director, one of the stakeholders in higher education theatre schools, is the one who decides both the form of a performance and an actor’s involvement (or lack thereof) in that certain performance. Limited or stimulated by the actor’s training level, the director is also a beneficiary of the education the acting student receives in drama school. This study aims at identifying the opinions of ten Romanian directors on the matter of the choreographic categories and skills the acting student acquires during his years of training at a higher education institution. We have used qualitative methodology research, based on semi-structured interviews, applied to a cross-section of ten directors from Bucharest, Cluj-Napoca, Constanţa, Craiova, Iaşi, and Tg. Mureş. This article tackles the issue of cognitive didactic objectives and students’ cognitive competencies that have been emphasized during the conversations with the aforementioned directors.

Geochemistry of peridotites, gabbros and trondhjemites of the Ballantrae complex, SW Scotland

1984 ◽  
Vol 75 (2) ◽  
pp. 193-209 ◽  
Author(s):  
E. Jelínek ◽  
J. Souček ◽  
Z. Řanda ◽  
P. Jakeš ◽  
B. J. Bluck ◽  
...  
Keyword(s):  
Trace Element ◽  
Analytical Data ◽  
Fractional Crystallisation ◽  
Ultramafic Rocks ◽  
Southwestern Part ◽  
Northern Margin ◽  
Pillow Lavas ◽  
Plagioclase Peridotite ◽  
High Level ◽  
Ree Patterns

ABSTRACTMajor and trace element, including REE, analytical data are used as bases for interpreting the petrogenesis of the major igneous components of the northern part of the Ballantrae complex which occurs in the southwestern part of the Midland Valley of Scotland. Most of the peridotite, now serpentinised, is similar to ultramafic rocks in other ophiolite complexes. Mean crystallisation conditions, determined on the basis of co-existing orthopy-roxenes and clinopyroxenes for the dominant peridotite and minor pyroxenite were 1060 (±60)°C—20 (±2) kb and 1240 (±89)°C—25 (±25) kb, respectively. These rocks, of mantle provenance, have compositions consistent with being residues after the extraction of 20–30% of tholeiitic material from the mantle. The presence among them of a rock whose REE contents indicate that it is a plagioclase peridotite, point to the tectonic incorporation of the products of a high level magma chamber.The mafic parts of the complex have tholeiitic characteristics and developed between 1300° and 1100°C. They do not represent primary mantle melt but fractionated material. Clinopyroxene was the main fractionating phase and more than 10% fractional crystallisation is indicated with increase from gabbros, through beerbachites (metadolerites) of a sheeted dyke complex and pillow lavas, to microgabbros and pyroxene diorites. Biotite diorites and trondhjemites represent the most fractionated products, the latter having affinities with ophiolitic plagiogranites.The beerbachites of the sheeted dyke complex do not all represent the same stage of fractionation. The pillow lavas have REE patterns similar to rocks found in marginal basins but are markedly different from pillow lavas from the Highland Border Complex in Arran, near the northern margin of the Midland Valley.

scholarly journals Refractive Indices of Biomass Burning Aerosols Obtained from African Biomass Fuels Using RDG Approximation

Atmosphere ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 62 ◽  
Author(s):  
Emmanuel Sarpong ◽  
Damon Smith ◽  
Rudra Pokhrel ◽  
Marc N. Fiddler ◽  
Solomon Bililign
Keyword(s):  
Cross Section ◽  
Biomass Burning ◽  
Climate Modeling ◽  
Field Measurements ◽  
Optical Parameter ◽  
Climate Forcing ◽  
Extinction Cross Section ◽  
The Real ◽  
Particle Mobility ◽  
High Level

Biomass burning (BB) aerosols contribute to climate forcing, but much is still unknown about the extent of this forcing, owing partially to the high level of uncertainty regarding BB aerosol optical properties. A key optical parameter is the refractive index (RI), which influences the absorbing and scattering properties of aerosols. This quantity is not measured directly, but it is obtained by fitting the measured scattering cross section and extinction cross section to a theoretical model using the RI as a fitting parameter. We used the Rayleigh–Debye–Gans (RDG) approximation to retrieve the complex RI of freshly emitted BB aerosol from two fuels (eucalyptus and olive) from Africa in the spectral range of 500–580 nm. Experimental measurements were carried out using cavity ring-down spectroscopy to measure extinction over the range of wavelengths of 500–580 nm and nephelometry to measure scattering at three wavelengths of 450, 550, and 700 nm for size-selected BB aerosol particles. The fuels were combusted in a tube furnace at a temperature of 800 °C, which is representative of the flaming stage of burning. Filter samples were collected and imaged using tunneling electron microscopy to obtain information on the morphology and size of the particles, which was used in the RDG calculations. The mean radii of the monomers were 27.8 and 31.5 nm for the eucalyptus and the olive fuels, respectively. The components of the retrieved complex RI were in the range of 1.31 ≤ n ≤ 1.56 and 0.045 ≤ k ≤ 0.468. The real and complex parts of the RI increase with increasing particle mobility diameter. The real part of the RI is lower, and the imaginary part is higher than what was recommended in literature for black carbon generated by propane or field measurements from fires of mixed wood samples. Fuel dependent results from controlled laboratory experiments can be used in climate modeling efforts and to constrain field measurements from biomass burning.

scholarly journals U-Turn Lanes in Narrow-Width Median Openings: Design Criteria for a Safe and Efficient Project

2016 ◽  
Vol 62 (3) ◽  
pp. 33-46 ◽  
Author(s):  
N. Distefano ◽  
S. Leonardi
Keyword(s):  
Cross Section ◽  
Design Criteria ◽  
The Road ◽  
Road Section ◽  
Narrow Width ◽  
Design Solutions ◽  
The Cross ◽  
Left Turns ◽  
High Level

Abstract U-turn lanes eliminate left turns at intersections and allow the manoeuvre to be made via median crossovers beyond the intersection. However, there are many situations where road infrastructures are characterized by the reduced width of the median. It is clear that, in such situations, we must adopt design criteria that take into account limitations imposed by the width of the cross-section of the road. This is the reason why it is necessary to adopt design solutions which expect a complete reorganization of the road section affected by the insertion of U-turns. In this paper, we intend to propose original guidelines for U-turn lane design, suitable to guarantee both the necessity to offer a high level of functionality of the road sections to be implemented by U-turns, and the principles of safety in order to reduce unsafe conditions during inversion manoeuvres as much as possible.

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