40Ar/39Ar dating of the Mealy dykes of Labrador: paleomagnetic implications

1989 ◽  
Vol 26 (8) ◽  
pp. 1567-1573 ◽  
Author(s):  
P. H. Reynolds
Keyword(s):  
Grenville Province ◽  
Polar Wander ◽  
The Third ◽  
The North ◽  
Grenville Orogeny ◽  
Younger Age ◽  
Radiogenic Argon ◽  
Gas Loss ◽  
The One ◽  
Spectrum Data

40Ar/39Ar age spectrum data are presented for amphibole and biotite from four dykes representing the diabase swarm in the Mealy Mountains Terrane, Grenville Province, Labrador. An amphibole plateau age of ca. 1215 Ma is recorded by two of the dykes. A third amphibole records a younger age (ca. 1150 Ma) through an apparent veil of excess radiogenic argon. It is suggested that the ca. 1215 Ma age may closely approximate the time of dyke intrusion; the third amphibole, from a dyke relatively close to the terrane boundary, may have been significantly overprinted by heat associated with the Grenville Orogeny. Two of the four biotite age spectra are discordant; apparent ages range from ~980 to 1060 Ma. It is suggested that Grenvillian reheating caused gas loss from all four biotites, the loss having been complete in two, including the one closest to the terrane boundary.Mealy dyke B paleopoles plot on and about the Grenville Track close to the calibrated 980 Ma point. This observation is consistent with observed magnetic "unblocking" temperatures, taken in conjunction with the extent of Grenvillian reheating as estimated from the biotite data. It is suggested that the Mealy A magnetization is much older and cannot be used to define the eastern (descending) arm of the Grenville apparent polar wander track. A plausible structural correction (to compensate for Grenvillian thrusting) could bring the A paleopoles close to the ca. 1200–1250 Ma point on the North American polar wander track; the latter is considered to be the most likely age.

COLEOPTERA OF THE NORTH SHORE OF THE GULF OF THE ST. LAWRENCE

1930 ◽  
Vol 62 (11) ◽  
pp. 239-246
Author(s):  
W. J. Brown
Keyword(s):  
The Other ◽  
The Third ◽  
North Shore ◽  
The North ◽  
Basal Margin ◽  
The One

Length 2.3-2.4 mm. ; width 1.1 mm. Elongate, suboval, moderately convex, fulvo-pubescent. Piceous with distinct aeneous lustre; each elytron with two yellow spots; the one as long as wide, including hunerus and basal margin and extending inwardly to the third interval; the other elongate oval and slightly oblique, extending from apical third to a point near apex.

scholarly journals The presence of supposedly primitive human tools along the upper reaches of the Kizil Irmak in Anatolia

1965 ◽  
Vol 16 (1) ◽  
pp. 78-87
Author(s):  
D. P. Erdbrink ◽  
H. R. Van Heekeren
Keyword(s):  
New York ◽  
Red River ◽  
The Third ◽  
The North ◽  
Anthropological Research ◽  
Ancient Times ◽  
The One ◽  
Terrace Level ◽  
Different Levels

Abstract. The first indications of the existence of fluviatile terraces in E. Anatolia were reported recently by Izbirak (1962) and Ketin (1962). The present authors have made a rapid and superficial exploration of a terrace system containing a maximum of five to seven different levels along the upper reaches of the great Kizil Irmak or Red River between Sivas and Kayseri in E. Anatolia. This region partly overlaps, but lies mostly to the North of the region described by Izbirak. It appears that the terrace levels are fairly constant along the mentioned stretch of the river. They disappear suddenly farther downstream. With Izbirak the present authors are of opinion that the formation of these terraces is probably due to tectonic activities in the first place and only secondarily to climatic influences. One terrace level, the third (counting from the lowest level) consistently contained a very limited number of what the authors suppose to be primitive artefacts, among which there are some pebble-tools. These are described in the paper; they may indicate the presence of hominids in Turkey during the earliest part of the Pleistocene. In one case a fossil molar of a Hipparion was found in this third level in situ, partly covered by the same petrified red loam which also enveloped some of the supposed artefacts. No exact dating of the terraces is as yet possible, but it may be inferred that the oldest and highest ones are Tertiary, the one containing the artefacts perhaps lowermost Pleistocene, and the lowest ones young Pleistocene or even Holocene. Some time ago Izbirak (1962) published a geomorphological study of part of the region along the upper reaches of the Kizil Irmak in Turkey. Without being aware of the results of this study, the present authors made some observations in almost the same area. Although of a different nature these coincide very well with Izbirak's conclusions. Thanks to a grant-in-aid assigned to one of us by the Wenner-Gren Foundation for Anthropological Research at New York, the voyage, and the collecting of material in Turkey, was made possible. We would like to thank the authorities of this Foundation for the rendering of this financial aid; the authorities of the Netherlands Embassy at Ankara, and Professor A. A. Cense at Istanbul, should receive our thanks and gratitude for the aid and advice given us during our stay The region visited by us was part of the upper valley of the Kizil Irmak, the Halys river of ancient times, lying between the cities of Sivas and Kayseri. Our observations began immediately downstream from Sivas at both sides of the river over a continuous stretch of approximately 20 kilometres. Lower downstream a number of traverses at right angles to the river valley's axis was made.

scholarly journals Locally Supported Orthogonal Wavelet Bases on the Sphere via Stereographic Projection

2009 ◽  
Vol 2009 ◽  
pp. 1-13 ◽  
Author(s):  
Daniela Roşca ◽  
Jean-Pierre Antoine
Keyword(s):  
Stereographic Projection ◽  
Tangent Plane ◽  
Continuous Wavelet ◽  
Orthogonal Wavelet ◽  
Wavelet Bases ◽  
Singularity Detection ◽  
The Third ◽  
The North ◽  
Local Support ◽  
The One

The stereographic projection determines a bijection between the two-sphere, minus the North Pole, and the tangent plane at the South Pole. This correspondence induces a unitary map between the correspondingL2spaces. This map in turn leads to equivalence between the continuous wavelet transform formalisms on the plane and on the sphere. More precisely, any plane wavelet may be lifted, by inverse stereographic projection, to a wavelet on the sphere. In this work we apply this procedure to orthogonal compactly supported wavelet bases in the plane, and we get continuous, locally supported orthogonal wavelet bases on the sphere. As applications, we give three examples. In the first two examples, we perform a singularity detection, including one where other existing constructions of spherical wavelet bases fail. In the third example, we show the importance of the local support, by comparing our construction with the one based on kernels of spherical harmonics.

Paleomagnetism of the Lac St-Jean anorthosite and related rocks, Grenville Province, Quebec

1983 ◽  
Vol 20 (2) ◽  
pp. 246-258 ◽  
Author(s):  
K. L. Buchan ◽  
W. F. Fahrig ◽  
G. N. Freda ◽  
R. A. Frith
Keyword(s):  
North American ◽  
Regional Metamorphism ◽  
The Other ◽  
Central Portion ◽  
Grenville Province ◽  
Polar Wander ◽  
Thermal Demagnetization ◽  
The North ◽  
Apparent Polar Wander Path ◽  
Normal Polarity

Alternating field and thermal demagnetization study of the Lac St-Jean anorthosite and related rock units in the central portion of the exposed Grenville Province reveals two components of magnetization, one of reversed and the other of normal polarity. Both components are thought to have been acquired during the last regional metamorphism, which was sufficiently intense in this area (mostly amphibolite grade) to reset any earlier magnetization. Corresponding paleopoles at 193°W, 8°S (dm = 7.3°, dp = 4.6°) and 213°W, 19°S (dm = 10.5°, dp = 8.5°) lie along the 950–900 Ma segment of the recently calibrated Grenville track of the North American apparent polar wander path, a track that has thus far been defined largely by results from rock units of the western Grenville.

Correlation of middle and upper Proterozoic strata of the northern rim of the North Atlantic craton

1979 ◽  
Vol 70 (13-14) ◽  
pp. 323-336 ◽  
Author(s):  
Grant M. Young
Keyword(s):  
North Atlantic ◽  
North American Cordillera ◽  
The Third ◽  
The North ◽  
Upper Proterozoic ◽  
Grenville Orogeny ◽  
Igneous Activity ◽  
The North Atlantic ◽  
North Atlantic Craton ◽  
Block Faulting

SynopsisOn the western and eastern sides of the North Atlantic craton, rocks between about 1·7 b.y. and 1·2 b.y. old are represented by thick basinal assemblages. Thin platformal successions cover the intervening region. The clastic component of these rocks was largely derived from the southeast where the Elsonian orogen might have been an important source terrane. Widespread mafic igneous activity (about 1·2 b.y. ago) in the central platformal region preceded orogenic movements in the basinal areas (Racklan-Carolinidian-Grenville orogeny). The Grenville orogen may have contributed significant amounts of clastic debris for a second cycle of sedimentary accumulation(∼ 1·2 b.y.–∼ 0·8 b.y.). The upper part of this cycle typically contains red beds and evaporites and, in the North American Cordillera, shows evidence of contemporaneous block faulting and extensional tectonism. These movements culminated in the East Kootenay and Hayhook orogenies and ushered in a third period of deposition about 850 m.y. ago. The third sequence includes glaciogenic rocks in the Cordilleran and East Greenland geosynclines. The basic geotectonic elements (platforms and geosynclines) of the North Atlantic craton were established as much as 1·7 b.y. ago, but continental fragmentation on the borders of the craton may not have taken place until early Phanerozoic times.

Paleomagnetism of pre-Grenvillian mafic intrusions from the Grenville Province, southeast Labrador

1989 ◽  
Vol 26 (12) ◽  
pp. 2541-2555 ◽  
Author(s):  
G. Murthy ◽  
C. F. Gower ◽  
M. Tubrett ◽  
R. Pätzold
Keyword(s):  
Layered Intrusions ◽  
Characteristic Direction ◽  
Heating Pulse ◽  
Grenville Province ◽  
Polar Wander ◽  
Mafic Intrusions ◽  
The North ◽  
Apparent Polar Wander Path ◽  
Layered Mafic Intrusion ◽  
Middle Proterozoic

Paleomagnetic results are reported for Middle Proterozoic layered intrusions and dykes from within the Grenville Province of coastal southeastern Labrador. Rock units studied include the Little Grady Island layered norite intrusion, crosscutting mafic dykes from Little Grady Island, the dated Michael Gabbro from Double Island, and other miscellaneous mafic intrusions. On the basis of mineralogy and composition, it is concluded that the Little Grady Island layered mafic intrusion, the crosscutting dykes from Little Grady Island, and the miscellaneous mafic intrusions belong to the same period of magmatism (ca. 1650 Ma), in contrast with the Michael Gabbro, which belongs to a later event (ca. 1426 Ma).All rock units (except two dykes from the Hawke River Terrane) yield similar directions of magnetization. The remanence is extremely stable and has a characteristic direction of declination (D) = 321.7 °and inclination (I) = −49.3 °(N = 20, k = 24.1, α95 = 6.8°), with corresponding paleopole at 0.1°N, 155.1°E. This paleopole is interpreted as being representative of Grenvillian remagnetization. Based on an earlier age-calibrated Grenville track of the North American apparent polar wander path, this magnetization is correlated with a 900 Ma event, probably a (heating) pulse superposed on the general Grenvillian cooling. In contrast with this regional behaviour, two dykes from the Hawke River Terrane (Earl Island) yield a characteristic remanence of D = 285.7 °and I = 6.6°, with corresponding pole at 12°N, 158°W, interpreted as acquired during pre-Grenvillian, probably Elsonian, resetting.

Alkohol im Tank – Bio-Kraftstoffe und die Grenzen moderner Mobilität

2004 ◽  
Vol 34 (136) ◽  
pp. 455-468
Author(s):  
Hartwig Berger
Keyword(s):  
Third World ◽  
Fossil Fuel ◽  
Energy Resources ◽  
The Third ◽  
Political Conflicts ◽  
The Future ◽  
Long Time ◽  
Food Market ◽  
The One ◽  
The Third World

The article discusses the future of mobility in the light of energy resources. Fossil fuel will not be available for a long time - not to mention its growing environmental and political conflicts. In analysing the potential of biofuel it is argued that the high demands of modern mobility can hardly be fulfilled in the future. Furthermore, the change into using biofuel will probably lead to increasing conflicts between the fuel market and the food market, as well as to conflicts with regional agricultural networks in the third world. Petrol imperialism might be replaced by bio imperialism. Therefore, mobility on a solar base pursues a double strategy of raising efficiency on the one hand and strongly reducing mobility itself on the other.

Al-Rasm al-ʿUthmānī: Towards Correct Pronunciation and the Preclusion of Ambiguity

2011 ◽  
Vol 13 (2) ◽  
pp. 201-171
Author(s):  
Nāṣir Al-Dīn Abū Khaḍīr
Keyword(s):  
Specific Pattern ◽  
Writing Style ◽  
The Third ◽  
The Past ◽  
Different Ages ◽  
Correct Pronunciation ◽  
The One ◽  
The Mind

The ʿUthmānic way of writing (al-rasm al-ʿUthmānī) is a science that specialises in the writing of Qur'anic words in accordance with a specific ‘pattern’. It follows the writing style of the Companions at the time of the third caliph, ʿUthmān b. ʿAffān, and was attributed to ʿUthmān on the basis that he was the one who ordered the collection and copying of the Qur'an into the actual muṣḥaf. This article aims to expound on the two fundamental functions of al-rasm al-ʿUthmānī: that of paying regard to the ‘correct’ pronunciation of the words in the muṣḥaf, and the pursuit of the preclusion of ambiguity which may arise in the mind of the reader and his auditor. There is a further practical aim for this study: to show the connection between modern orthography and the ʿUthmānic rasm in order that we, nowadays, are thereby able to overcome the problems faced by calligraphers and writers of the past in their different ages and cultures.

MBAH HENDRO KUSUMO BIN SYECH AHMAD MUTAMAKKIN: JEJAK SYIAR ISLAM DI WILAYAH PATI

EMPIRISMA ◽  
2008 ◽  
Vol 27 (2) ◽  
Author(s):  
Fathimatuz Zahra Dan Abdul Azis
Keyword(s):  
Central Region ◽  
Marital Relationship ◽  
Southern Region ◽  
North Coast ◽  
The North ◽  
Trace Back ◽  
Northern Regions ◽  
The One

Pati is a region on the north coast, according to the hypothesis of the researcher, the region is divided into three categories. The northern regions are more religious, the central is more plural, while the southern region is in the middle. In the central region there are many relics of tombs believed to be the those of the Muslim proselytizers in the area of Pati. The one that attracts the researcher is a tomb in the Gambiran area, where there are five local Muslim saints buried, one of them belons to mbah Hendro Kusumo, the son of Syech Ahmad Mutamakkin. This article attempts to trace back the spreading of Islam in Pati based on the existence of thetomb of Mbah Hendro Kusumo. It wants to answer question of whethere the existence of his tomb is due to his studying there or marital relationship, and how it relates to the spreading of Islam.Keywords: Mbah Hendro Kusumo, Traces of Islamic Dakwah, Islam

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