Introduction to Special Issue 2 on the NATMAP Shield Margin Project: The Flin Flon Belt, Trans-Hudson Orogen, Manitoba and Saskatchewan

1999 ◽  
Vol 36 (11) ◽  
pp. 1763-1765 ◽  
Author(s):  
S B Lucas ◽  
E C Syme ◽  
K E Ashton
Keyword(s):  
Special Issue ◽  
Four Dimensions ◽  
Metasedimentary Rocks ◽  
Research Areas ◽  
Conductivity Structure ◽  
Tracer Isotope ◽  
Close Cooperation ◽  
Isotope Studies ◽  
Flin Flon ◽  
Southern Flank

The Shield Margin Project of the National Geoscience Mapping Program (NATMAP) resulted in a new understanding of the Paleoproterozoic Flin Flon Belt (Manitoba and Saskatchewan) in four dimensions. A multidisciplinary approach was utilized in the NATMAP project, based on partnerships with government, university, and private sector geoscientists, and close cooperation with the Lithoprobe's Trans-Hudson Orogen Transect. Research areas spanned from bedrock and surficial geoscience, to crustal and mantle geophysics, to high precision U-Pb geochronology and tracer isotope studies. This Special Issue contains nine papers covering a wide variety of topics related to the NATMAP Shield Margin Project, including volcanic-hosted massive sulphide deposits in the Flin Flon and Snow Lake camps; structural geology of the Flin Flon townsite and southern flank of the Kisseynew Domain; geochronology and the U-Pb systematics of monazite in metasedimentary rocks; and the geoelectrical and crustal conductivity structure of the Flin Flon Belt.

Geoelectric response and crustal electrical-conductivity structure of the Flin Flon Belt, Trans-Hudson Orogen, Canada

1999 ◽  
Vol 36 (11) ◽  
pp. 1917-1938 ◽  
Author(s):  
I J Ferguson ◽  
Alan G Jones ◽  
Yu Sheng ◽  
X Wu ◽  
I Shiozaki
Keyword(s):  
Geological Structure ◽  
The Body ◽  
Geomagnetic Induction ◽  
The North ◽  
Gneiss Complex ◽  
Conductivity Structure ◽  
Intrusive Rocks ◽  
Magnetotelluric Method ◽  
Flin Flon ◽  
Southern Flank

A Lithoprobe magnetotelluric survey across the Palaeoproterozoic Trans-Hudson Orogen included 34 sites within the Flin Flon Belt and adjacent geological domains. The magnetotelluric impedance tensors and geomagnetic induction vectors reveal four distinct geoelectric zones along this segment of the Lithoprobe transect. In the east and west, the geoelectric responses are dominated by the contrast between intrusive rocks and more conductive ocean-floor assemblages. A significant characteristic of the responses throughout the Flin Flon Belt is the very strong galvanic distortion of the electric field, which reflects the complexity of the upper crustal geological structure in the greenstone belt, requiring careful application of distortion removal methods. The responses at sites near the north of the Flin Flon Belt are related to the boundary with the southern flank of the Kisseynew gneiss belt. To the south, at sites near Athapapuskow Lake, the responses are dominated by a strong upper-crustal conductor. The magnetotelluric observations show that the Athapapuskow Lake conductivity anomaly extends for at least 40 km along strike (~N36°E), and is roughly two-dimensional in form. Numerical modelling shows that the top of the body dips southeast at 20-50° from a western edge coincident with the Athapapuskow Lake shear zone. The conductor lies in the eastern part of the Namew gneiss complex. The magnetotelluric method cannot resolve the exact spatial distribution of conductive rocks but it is probable that the anomaly is caused by a series of isolated conductors (with resistivity <1 Ω·m) associated with subordinate graphitic and sulphidic supracrustal gneisses.

Geochemistry of the Namurian Lismore Formation, northern mainland Nova Scotia: sedimentation and tectonic activity along the southern flank of the Maritimes Basin

1999 ◽  
Vol 36 (10) ◽  
pp. 1655-1669 ◽  
Author(s):  
Jacquelyn E Stevens ◽  
J Brendan Murphy ◽  
Fred W Chandler
Keyword(s):  
Nova Scotia ◽  
Tectonic Activity ◽  
Isotopic Data ◽  
Rock Fragments ◽  
Metasedimentary Rocks ◽  
Clastic Rocks ◽  
Granitoid Rocks ◽  
Maritimes Basin ◽  
Group B ◽  
Southern Flank

Geochemical and isotopic data from the clastic rocks of the Namurian Lismore Formation in mainland Nova Scotia identify key episodes of tectonic activity during the development of the Maritimes Basin in Atlantic Canada. The Lismore Formation forms part of the Mabou Group and is an upward-coarsening 2500 m thick fluvial sequence deposited in the Merigomish sub-basin along the southern flank of the Maritimes Basin. Based on stratigraphic evidence, the Lismore Formation can be divided into upper and lower members which reflect variations in depositional environment and paleoclimate. The geochemical and isotopic data may also be subdivided into two groupings that primarily reflect varying contributions from accessory phases, clay minerals, or rock fragments. This subdivision occurs 115 m above the base of the upper member. The data from the lower grouping (group A) show an important contribution from underlying Silurian rocks, with a relatively minor contribution from Late Devonian granitoid rocks from the adjacent Cobequid Highlands and possibly metasedimentary rocks from the Meguma Terrane to the south. The data from the upper grouping (group B) reveal a more important contribution from the Cobequid Highlands granitoid rocks. This variation in geochemistry is thought to constrain the age of renewed motion and uplift along the faults along the southern flank of the Maritimes Basin and, more generally, suggests that geochemical and isotopic data of continental clastic rocks may help constrain the age of tectonic events that influence deposition of basin-fill rocks.

Conditions for emerald formation at Davdar, China: fluid inclusion, trace element and stable isotope studies

2012 ◽  
Vol 76 (1) ◽  
pp. 213-226 ◽  
Author(s):  
D. Marshall ◽  
V. Pardieu ◽  
L. Loughrey ◽  
P. Jones ◽  
G. Xue
Keyword(s):  
Stable Isotope ◽  
Fluid Inclusion ◽  
Trace Element ◽  
Metasedimentary Rocks ◽  
Quartz Veins ◽  
Trace Element Chemistry ◽  
Stable Isotope Signatures ◽  
Swat Valley ◽  
Isotope Studies ◽  
Geological Work

AbstractPreliminary geological work on samples from Davdar in China indicate that emerald occurs in quartz veins hosted within upper greenschist grade Permian metasedimentary rocks including quartzite, marble, phyllite and schist. Fluid inclusion studies indicate highly saline fluids ranging from approximately 34 to 41 wt.% NaCl equivalent, with minimal amounts of CO2 estimated at a mole fraction of 0.003. Fluid inclusion, stable isotope and petrographic studies indicate the Davdar emeralds crystallized from highly saline brines in greenschist facies conditions at a temperature of ∼350°C and a pressure of up to 160 MPa. The highly saline fluid inclusions in the emeralds, the trace-element chemistry and stable isotope signatures indicate that the Davdar emeralds have some similarities to the Khaltaro and Swat Valley emerald deposits in Pakistan, but they show the greatest similarity to neighbouring deposits at Panjshir in Afghanistan.

scholarly journals Light, mind and spirit: Paul Willis’s Learning to Labour revisited on and beyond its 40th anniversary

Ethnography ◽  
2018 ◽  
Vol 19 (4) ◽  
pp. 433-445 ◽  
Author(s):  
Mats Trondman ◽  
Anna Lund
Keyword(s):  
Working Class ◽  
Cultural Production ◽  
Social Reproduction ◽  
Significant Contribution ◽  
Ethnographic Study ◽  
Special Issue ◽  
40Th Anniversary ◽  
Cultural Autonomy ◽  
Research Areas ◽  
Educational Sciences

This article is an introduction to a Special Issue dedicated to Paul Willis’s classic Learning to Labour at its 40th anniversary, and beyond. His theoretically informed and theorizing ethnographic study is read, explored, and utilized all around the globe. Its use also stretches across the borders of social, cultural and educational sciences and to manifold research areas and settings. Besides laying out its main content, that is, the answers to the question of how working-class kids let themselves get working-class jobs, this article argues that the most significant contribution of Willis’s study is the way it illuminates, both theoretically and empirically, the meaning of cultural production and cultural autonomy in the midst of ongoing social reproduction of class. This introduction ends by presenting the eight contributions to the actual Special Issue, and with an invitation to Paul Willis himself to take issue with cultural production and cultural autonomy.

scholarly journals The Sacramental Text Reconsidered

2017 ◽  
Vol 66 (3) ◽  
pp. 534-540
Author(s):  
Sarah Beckwith
Keyword(s):  
Literary Studies ◽  
Special Issue ◽  
Four Dimensions ◽  
Historical Trajectory

As an Afterword to the Special Issue on “The Sacramental Text Reconsidered,” this essay consolidates approaches to sacramentality in literary studies in four dimensions, and these dimensions are symptomatic of the wider sub-field and the larger context of literary studies at present. Those four ways are: the sacrament as a historical trajectory; the sacrament as concept, and also the vehicle of conceptual amnesia; the sacrament as language; the sacrament as literature.

Petrogenesis of the Boundary intrusions in the Flin Flon area of Saskatchewan and Manitoba

1977 ◽  
Vol 14 (3) ◽  
pp. 444-455 ◽  
Author(s):  
Eric C. Syme ◽  
Richard W. Forester
Keyword(s):  
Basaltic Magma ◽  
Molar Ratio ◽  
Chemical Characteristics ◽  
Olivine Gabbro ◽  
Metasedimentary Rocks ◽  
Metavolcanic Rocks ◽  
Flin Flon ◽  
Group 2 ◽  
The Town ◽  
Felsic Rocks

The Aphebian Boundary intrusions are a group of lensoid, ultramafic to felsic rocks which occur in a N–NW trending zone 10 km long by 4 km wide centred on the town of Flin Flon. The intrusions were emplaced into Amisk metavolcanic rocks and Missi metasedimentary rocks. Field relationships, petrography, and chemical characteristics of the Boundary intrusions indicate that they are composed of three compositionally distinct, sequentially emplaced groups. From oldest to youngest, these are (1) a mafic augite- and biotite-bearing mela-dioritic group, (2) a felsic group ranging from leucodiorite to granodiorite, and (3) an olivine-bearing (wehrlite to olivine gabbro) group. The mafic group crystallized at relatively high [Formula: see text] and [Formula: see text], such that successive differentiates have increasing MgO/FeO ratios. Molar ratio diagrams clearly indicate that fractionation of augite, minor magnetite, and possibly subordinate olivine can account for the observed chemical variation of approximately 80% of this group, whereas the olivine-bearing group could only have formed by crystal fractionation of subequal amounts of olivine and clinopyroxene, and minor magnetite. The felsic group is chemically similar to the post-Missi granodioritic plutons and cannot represent SiO2-rich residual liquids produced solely by fractionation of augite and olivine from a basaltic magma.

Introduction to special issue of Canadian Journal of Earth Sciences: The Trans-Hudson Orogen Transect of Lithoprobe

2005 ◽  
Vol 42 (4) ◽  
pp. 379-383 ◽  
Author(s):  
Zoltan Hajnal ◽  
Kevin M Ansdell ◽  
Ken E Ashton
Keyword(s):  
Earth Sciences ◽  
Canadian Journal ◽  
Geological Survey ◽  
Special Issue ◽  
Volcanic Arc ◽  
Strong Case ◽  
Flin Flon

Dedication: Dr. John F. Lewry (1939–1999; see Saskatchewan Geological Survey 1999) dedicated his career to investigations of the Saskatchewan–Manitoba segment of the Trans-Hudson Orogen (THO), one of the principal Paleoproterozoic orogens associated with the assembly of Laurentia. Indeed, one can make a strong case that Lithoprobe's Trans-Hudson Orogen Transect (THOT) was designed to test the tectonic models proposed by John Lewry. He delineated the distinct tectonic provinces in the western part of the THO, predicted the presence of an Archean craton trapped within the THO, and recognized and interpreted the significance of the Pelican Thrust between the juvenile Paleoproterozoic volcanic arc complex of the western Flin Flon Domain and the Archean craton, now called the Sask craton. The research published in Lewry and Stauffer (1990), and many of his ideas, provided the framework for the design of the THOT geophysical and geological studies. John Lewry was co-leader of the THOT until he passed away in 1999 after a battle with cancer. This Special Issue of the Canadian Journal of Earth Sciences is dedicated to him.

Introduction: Negotiation in intergroup conflict

2010 ◽  
Vol 13 (6) ◽  
pp. 675-683 ◽  
Author(s):  
Stéphanie Demoulin ◽  
Carsten K.W. de Dreu
Keyword(s):  
Conflict Management ◽  
Intergroup Relations ◽  
Intergroup Conflict ◽  
Special Issue ◽  
Intergroup Relation ◽  
High Quality ◽  
Systematic Analysis ◽  
Research Areas ◽  
Affective Processes ◽  
Current Special Issue

Although conflicts most often occur between groups, research and theory on conflict management and negotiation have largely focused on the interpersonal system and ignored how groups negotiate a solution to their intergroup conflict. Thus we have a thorough understanding of the motivational, cognitive, and affective processes underlying the development of high quality solutions in interpersonal negotiation, but we know little about the extent to which these insights can be comfortably generalized to intergroup settings. Likewise, the large volume of work on intergroup perceptions and intergroup relations has much to say about intergroup negotiation, but these research areas have rarely been connected and produced systematic analysis. The current Special Issue presents research on these topics and aims at promoting cross-talk between negotiation researchers and social psychologists in the intergroup relation domain.

Signal Compression

1997 ◽  
Vol 08 (01) ◽  
pp. 1-12 ◽  
Author(s):  
Nikil Jayant
Keyword(s):  
Perceptual System ◽  
Future Research ◽  
Signal Quality ◽  
Signal Compression ◽  
Special Issue ◽  
Basic Principles ◽  
Research Directions ◽  
Four Dimensions ◽  
Future Research Directions ◽  
Signal Coding

This article is an introduction to a special issue on signal coding and compression. We begin by defining the concepts of digital coding and audiovisual signal compression. We then describe the four dimensions of coding performance: bit rate, signal quality, processing delay and complexity. We illustrate the two basic principles of audiovisual coding, removal of signal redundancy and the matching of the quantizing system to the properties of the human perceptual system, with specific recent examples of coding algorithms. We then summarize standards for, and applications of audiovisual signal compression. A fast-emerging application is the internetworking of audiovisual information, a field that is too recent to be covered in the articles in this collection. We conclude our article by presenting our views about future research directions in the field.

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