The Age of the Sudbury Nickel Irruptive and the Murray Granite

1975 ◽  
Vol 12 (12) ◽  
pp. 1970-1989 ◽  
Author(s):  
Walter A. Gibbins ◽  
R. H. McNutt
Keyword(s):  
Shock Metamorphism ◽  
Greenschist Facies ◽  
The South ◽  
Rock Samples ◽  
The North ◽  
Facies Metamorphism ◽  
North And South ◽  
Granite Samples ◽  
Greenschist Facies Metamorphism

Whole-rock samples of norite from the North and South Ranges of the Sudbury Irruptive yield a rubidium strontium isochron of 1956 ± 98 Ma age and (87Sr/86Sr)o = 0.7063 (λ87Rb = 1.39 × 10−11 a−1). Five samples of ore bearing 'sub-layer' from the South Range are compatible with this age. Four new determinations of South Range and six published analyses of North Range micropegmatite define an isochron of age = 1680 ± 30 Ma with (87Sr/86Sr)o = 0.708.The norite age is believed to represent the 'Sudbury event', a local event marked by the development of shock metamorphism and intrusion of the nickel irruptive. The 1680 Ma micropegmatite age is believed to be secondary and related to greenschist-facies metamorphism in the center of the Sudbury Basin during the Penokean Orogeny. Evidence supporting a later separate intrusion of granophyre-rich micropegmatite suggests that the time of this intrusion was relatively soon after the norite rather than 1680 Ma ago.Analyses of Murray granite samples indicate a pre-norite age of 2260 Ma. Most of the Murray granite shows evidence of later metamorphic events including the Sudbury event. Late (post-norite and post-Murray granite) granitic dikes (i.e., the Murray offshoots) intrude the norite near the Murray granite. These and other smaller granitic dikes appear to have formed 1700 to 1800 Ma ago. The origin of these dikes remains problematical.

Crossitic amphibole and its possible tectonic significance in the Richmond Area, southeastern Quebec

1976 ◽  
Vol 13 (5) ◽  
pp. 711-714 ◽  
Author(s):  
W. E. Trzcienski Jr.
Keyword(s):  
Subduction Zone ◽  
Geophysical Data ◽  
Greenschist Facies ◽  
The South ◽  
Tectonic Significance ◽  
Facies Metamorphism ◽  
Greenschist Facies Metamorphism

Crossitic amphibole suggesting blueschist-type metamorphism has been found in the Richmond area, southeastern Quebec. Prehnite facies metamorphism to the northeast of Richmond and greenschist facies metamorphism to the south along with the blueschist-type metamorphism and geophysical data suggest that the Richmond area may represent a partially eroded Ordovician subduction zone.

A transition from diagenesis to greenschist facies within a major Variscan fold/thrust complex in SW England

1985 ◽  
Vol 49 (352) ◽  
pp. 365-374 ◽  
Author(s):  
T. J. Primmer
Keyword(s):  
Greenschist Facies ◽  
North Coast ◽  
Illite Crystallinity ◽  
Continuous Section ◽  
The North ◽  
Mineral Assemblages ◽  
Facies Metamorphism ◽  
O Isotope ◽  
Greenschist Facies Metamorphism ◽  
Pelitic Rocks

AbstractThe north coast of Cornwall, from Bude to Newquay, provides a continuous section through a major Variscan fold/thrust complex. Illite crystallinity studies have revealed a transition from diagenesis in the north to greenschist facies metamorphism in the south in the Upper Palaeozoic succession. More detailed studies of mineral assemblages in both metabasites and pelitic rocks support the regional pattern of metamorphism indicated by illite crystallinity, and show that locally in the Tintagel district, the grade of metamorphism may have reached middle to upper greenschist facies. An attempt to correlate the above data with temperatures (108–985°C) derived from O-isotope geothermometers is made. Interpretation of the metamorphic data presented helps to emphasize the tectonic importance of the major structures seen in the fold/thrust complex.

Observed seasonal regimes of North-South Atlantic Ocean interbasin exchange

2019 ◽  
Author(s):  
Hamed D. Ibrahim
Keyword(s):  
North Atlantic ◽  
Climate Models ◽  
South Atlantic ◽  
Meridional Overturning Circulation ◽  
Volume Flux ◽  
The South ◽  
The North ◽  
Basin Scale ◽  
Interbasin Exchange ◽  
North And South

North and South Atlantic lateral volume exchange is a key component of the Atlantic Meridional Overturning Circulation (AMOC) embedded in Earth’s climate. Northward AMOC heat transport within this exchange mitigates the large heat loss to the atmosphere in the northern North Atlantic. Because of inadequate climate data, observational basin-scale studies of net interbasin exchange between the North and South Atlantic have been limited. Here ten independent climate datasets, five satellite-derived and five analyses, are synthesized to show that North and South Atlantic climatological net lateral volume exchange is partitioned into two seasonal regimes. From late-May to late-November, net lateral volume flux is from the North to the South Atlantic; whereas from late-November to late-May, net lateral volume flux is from the South to the North Atlantic. This climatological characterization offers a framework for assessing seasonal variations in these basins and provides a constraint for climate models that simulate AMOC dynamics.

Four new Burmese species of Hemiphyllodactylus Bleeker (Squamata: Gekkonidae) from distantly related parapatric clades from the Shan Plateau and Salween Basin

Zootaxa ◽  
2020 ◽  
Vol 4758 (1) ◽  
pp. 45-82 ◽  
Author(s):  
L. LEE GRISMER ◽  
PERRY L. JR. WOOD ◽  
EVAN S. H. QUAH ◽  
MYINT KYAW THURA ◽  
JAMIE R. OAKS ◽  
...  
Keyword(s):  
New Species ◽  
Cloud Forest ◽  
Mitochondrial Gene ◽  
Color Pattern ◽  
The South ◽  
Taxonomic Analysis ◽  
The North ◽  
North And South ◽  
Northwestern Thailand

An integrative taxonomic analysis based on morphology, color pattern, and the mitochondrial gene ND2 recovered four new species of Hemiphyllodactylus Bleeker that are endemic to the Shan Plateau or Salween Basin in eastern Myanmar. Hemiphyllodactylus ngwelwini sp. nov. from the Shan Plateau is part of the earlier described “eastern Myanmar clade” renamed herein as the north lineage and H. kyaiktiyoensis sp. nov. and H. pinlaungensis sp. nov. of the Shan Plateau and H. zwegabinensis sp. nov. of the Salween Basin compose an entirely new Burmese clade herein referred to as the south lineage. Although the north and south lineages come within 46 km of one another on the Shan Plateau, they are not sister lineages but sequentially separated by two lineages from Yunnan, China and another from northwestern Thailand. Hemiphyllodactylus zwegabinensis sp. nov. is the first species of this genus to be recorded from the Salween Basin and is known only from a wind-blown cloud forest on the top of the insular, karstic mountain Zwegabin in Kayin State. All other Burmese species except for H. typus, are endemic to the various localities throughout the Shan Plateau. These four new species bring the total number of Hemiphyllodactylus in Myanmar to at least 10 which is certainly an extreme underestimate of the diversity of this genus given that we discover new species at every upland locality we survey. 

Decolonising cities of the global South in the classroom and beyond

2020 ◽  
Vol 91 (5) ◽  
pp. 535-552
Author(s):  
Astrid Wood
Keyword(s):  
Global South ◽  
Colonial Literature ◽  
The South ◽  
Post Colonial ◽  
The North ◽  
The World ◽  
North And South

In the post-colonial context, the global South has become the approved nomenclature for the non-European, non-Western parts of the world. The term promises a departure from post-colonial development geographies and from the material and discursive legacies of colonialism by ostensibly blurring the bifurcations between developed and developing, rich and poor, centre and periphery. In concept, the post-colonial literature mitigates the disparity between cities of the North and South by highlighting the achievements of elsewhere. But what happens when we try to teach this approach in the classroom? How do we locate the South without relying on concepts of otherness? And how do we communicate the importance of the South without re-creating the regional hierarchies that have dominated for far too long? This article outlines the academic arguments before turning to the opportunities and constraints associated with delivering an undergraduate module that teaches post-colonial concepts without relying on colonial constructs.

Debating the South in Unified Italy

2020 ◽  
pp. 186-214
Author(s):  
Stefan Nygård
Keyword(s):  
Nation State ◽  
The South ◽  
National Politics ◽  
The North ◽  
Political Debates ◽  
Catching Up ◽  
History Of ◽  
South Axis ◽  
Nation State Formation ◽  
North And South

The history of modern Italy is an illustrative example of the different social and spatial layers of the North–South divide. Since unification in 1861, Italy has struggled to overcome regional imbalances, mainly although not exclusively along a North–South axis. With an emphasis on the period following unification, when North-South was placed at the centre of national politics, this chapter surveys the lingering debates on Italy’s so-called Southern question and the dynamics of nation-state formation in which it is embedded. The contested history of this process includes debates over economic and moral debts caused by the uneven distribution of gains and sacrifices between North and South as a result of unification. Socio-economically, two North–South divides developed in parallel after unification; the more significant one between Italy and transalpine Europe, and the initially minor but eventually growing divergence between the northern and southern regions within Italy. The ideas of development, catching-up and “Europeanization” were recurring themes in the intellectual and political debates discussed in the chapter. The contested issue was whether the North was developing the South, or vice versa.

Infection of the Pacific saury Cololabis saira (Brevoort, 1856) (Teleostei: Beloniformes: Scomberesocidae) by Pennella sp. (Copepoda: Siphonostomatoida: Pennellidae) south of the Subarctic Front

2020 ◽  
Vol 40 (4) ◽  
pp. 384-389
Author(s):  
Satoshi Suyama ◽  
Shigeho Kakehi ◽  
Takashi Yanagimoto ◽  
Seinen Chow
Keyword(s):  
Intermediate Host ◽  
Parasitic Copepod ◽  
Pacific Saury ◽  
The South ◽  
Subarctic Region ◽  
The North ◽  
Cololabis Saira ◽  
Subarctic Front ◽  
The Pacific ◽  
North And South

Abstract The Pacific saury (Cololabis saira) is a fish of commercial importance subject to unpredictable epidemics of infection by Pennella sp., a parasitic copepod. We analyzed the distribution of fish presenting with newly attached Pennella to determine the region and season in which Pennella first infect the fish. Pacific sauries migrate northward in the spring to spend the summer in the subarctic region, successively crossing the Subarctic Boundary (SAB) and the Subarctic Front (SAF). The fish then return to subtropical waters in the fall and overwinter there. Pacific sauries infected with Pennella were observed on both the north and south sides of the SAF from May to December. Newly attached Pennella, however, were observed mainly to the south of the SAF during the northward migration of the fish in May and June, and only to the south of the SAB during the southward migration in November and December. These results indicate that the intermediate host or hosts of Pennella inhabit the region south of the SAF, with infection of Pacific saury occurring during late fall and spring. Such information may assist in identifying the intermediate host(s).

scholarly journals Explaining Cultural Capital through Combining Different Dimensions of Social Capital: A Fussy Analysis Based on Artificial Neural Network Approach (ANNFIS) (A Case Study of Citizens Aged 18 and Above in Tehran)

2016 ◽  
Vol 3 (2) ◽  
pp. 46
Author(s):  
Ghorbanali Ebrahimi ◽  
Hadi Razeghimaleh
Keyword(s):  
Neural Network ◽  
Social Capital ◽  
Artificial Neural Network ◽  
Cultural Capital ◽  
Multivariate Linear Regression Analysis ◽  
The South ◽  
The North ◽  
The Mean ◽  
Artificial Neural ◽  
North And South

<p>The main objective of this study was to find out whether social capital and its dimensions affect the cultural capital of citizens in Tehran, and whether there is any difference in the social capital and cultural capital in the north and south urban neighborhoods. To answer these questions, a fuzzy questionnaire for collecting the data was designed. The research method in this study was based on Artificial Neural Network -Fuzzy Inference System (ANNFIS). Statistical population included individuals aged 18 and above residing in Tehran, and sample size consisted of 2538 people.</p><p>The findings of this study indicated that there is a significant difference in the cultural capital between north and south neighborhoods in Tehran. The mean of cultural capital in the south neighborhoods (2.49 out of 10) was higher than that of north neighborhoods (6.77 out of 10). Furthermore, the degree of neighborhood social capital was different between the north and south neighborhoods of Tehran, and this difference was statistically significant, so that the mean of social capital in the south neighborhoods (6.75 out of 10) was greater than that of north neighborhoods (2.88 out of 10).</p>Multivariate linear regression analysis to explain cultural capital has revealed that social trust (- 0.502) and relation networks (- 0.087) exerted the highest and lowest impact on the dependent variable, respectively. It should be noted that, of the three variables entered into the regression equation, all variables have remained in the equation. It should be noted that the effects of all variables on the dependent variable of cultural capital was negative.

Epitaphic Nation: The Problem of the South and Necropolitics in Early Modern Vietnamese National Literature

PMLA ◽  
2011 ◽  
Vol 126 (3) ◽  
pp. 685-692
Author(s):  
Nguyễn-Võ Thu-Hương
Keyword(s):  
Early Modern ◽  
Literary History ◽  
State Violence ◽  
The South ◽  
The North ◽  
Literary Genealogy ◽  
The Republic ◽  
The Village ◽  
North And South ◽  
The Church

Whoever goes down to Bà Ria and happens by the cemetery in the sand at the village of Phu'ó'c Lě, I beg you to go in that cemetery and look for the grave with a cross painted half black, half white, by the side of the Church of Martyrs–to visit that grave lest it become pitiful. Because it has been two years since anyone visited or cast as much as a glance.—Nguyễn Trong QuanSO opens nguyễn trọng quản's thẩy lazaro phiển (“lazaro phiển” 22). The narrative begins at an obscure gravesite evokes the life of a man as both victim of state violence and perpetrator of private deaths. Lazaro Phiển is a ictional work written in the romanized script and was published in Saigon in 1887 in a novelistic format almost forty years before Hoàng Ngọc Phách's Tố Tâm. Yet the latter, published in Hanoi in 1925, is oten touted in official literary history as the first modern Vietnamese novel. Although Nguyễn Trọng Qu.n's narrative revolves around the recovery of an elided story, the author could not have anticipated the elision of his work from a nationalist literary genealogy that locates the origin of modern Vietnamese literature in the North. he elision was part of a general omission of works from the South in the last decades of the nineteenth century and irst two decades of the twentieth. his genealogy was by no means limited to the Democratic Republic of Vietnam in the North but was also perpetuated in the Republic of Vietnam in the South ater independence and the partitioning of the country into North and South in 1954

Zircon U–Pb geochronology of the Zanhuang metamorphic complex: reappraisal of the Palaeoproterozoic amalgamation of the Trans-North China Orogen

2013 ◽  
Vol 150 (4) ◽  
pp. 756-764 ◽  
Author(s):  
LING-LING XIAO ◽  
GUO-DONG WANG ◽  
HAO WANG ◽  
ZONG-SHENG JIANG ◽  
CHUN-RONG DIWU ◽  
...  
Keyword(s):  
High Resolution ◽  
North China Craton ◽  
North China ◽  
Metamorphic Complex ◽  
Middle Section ◽  
The South ◽  
The North ◽  
Facies Metamorphism ◽  
Isothermal Decompression ◽  
Metamorphic Terranes

AbstractAmphibolites and metapelites exposed in the Zanhuang metamorphic complex situated in the south-middle section of the Trans-North China Orogen (TNCO) underwent upper-amphibolite-facies metamorphism and record clockwise P–T paths including retrograde isothermal decompression. High-resolution zircon U–Pb geochronological analyses indicate that the metamorphic peak occurred during ~ 1840–1860 Ma, which is in accordance with the ubiquitous metamorphic ages of ~ 1850 Ma retrieved by miscellaneous geochronologic methods throughout the metamorphic terranes of the northern TNCO, confirming that the south-middle section of the TNCO was involved in the amalgamation of the Eastern and Western Blocks of the North China Craton during the Palaeoproterozoic.

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