ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422066

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

A preliminary account is given of the geology of the Queen Alexandra Range flanking the west side of the Beardmore Glacier in the southern part of the Ross Dependency. The basement rocks in the northern part of the range are strongly folded, late Precambrian greywackes and phyllites intruded by post–tectonic plutons of microcline–biotite granite. Cambrian limestones and conglomerates containing Archaeocyathinae crop out as a basement inlier at the Buckley nunatak at the head of the Beardmore Glacier. The basement rocks were peneplaned in the Early Paleozoic and covered by at least 7,000 ft of continental sediments of the Beacon Group of Gondwana age. Basal quartz arenites of Carboniferous and/or Devonian age are overlain by early Permian tillite, fluvioglacial sandstone, and dark shales, followed by Lower Permian coal measures with theGlossopterisflora. An Upper Permian –Triassic alternating sandstone–siltstone sequence overlies, capped by basaltic lavas. The Beacon sediments are extensively intruded by dolerite sills. Columns are presented showing provisional correlation of the Beacon Goup of East Antarctica with Gondwana rocks of Eastern Australia, Central India, South Africa, Falkland Islands, Brazil, and Argentina. Stratigraphic, floral, and faunal similarities between Antarctica and other southern continents show that Antarctica can truly be considered a part of “Gondwana–land.”; Paleoclimatic evidence is used to test the paleogeographic reconstructions of supporters of the Continental Drift Theory. The report is accompanied by a geological map on a scale of about 10 miles to an inch.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422067

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422068

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

In the Wright Valley and Taylor Glacier region of southern Victoria Land more than 5,000 feet of mid-Paleozoic to mid-Mesozoic sedimentary rocks of the Beacon Group overlie nonconformably a Precambrian to Lower Paleozoic basement. The rocks of the Beacon Group are mainly subgreywacke, arkose, and orthoquartzite. The oldest include dark subgreywacke breccia and conglomerate (Boreas Subgreywacke Member), and pink to grey arkose (Odin Arkose). An almost pure quartz sandstone (Beacon Heights Orthoquartzite) overlies the Odin Arkose and is the thickest and most widespread formation in this region. There follow in several localities a thin formation of red and green siltstone (Aztec Siltstone), and a younger formation of quartz sandstone, carbonaceous sandstone, siltstone, and shale (Weller Sandstone). Sedimentary features in these formations include massive bedding, cross bedding, cross lamination, alternating coloured beds, and desiccation polygons. Tracks, castings, and burrows of invertebrates are rare. Correlation with fossil localities adjacent to the area suggests that the Beacon Group in this region was deposited during the Devonian, Carboniferous, and possibly the Permian Periods. The rocks were laid down in fluvial, lacustrine, paludal, and aeolian environments.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422069

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

A paleomagnetic study has been made of thirteen oriented samples of Jurassic dolerite from sills intruding sedimentary rocks of the Beacon Group near the Beard-more Glacier (84°S, 165°E). Laboratory tests indicate a stable direction of magnetisation with a declination of 244°and an inclination of ∼75°(steeply upwards), from which the paleomagnetic pole relative to Antarctica for the Jurassic is calculated on the geocentric dipole model to have been at 59°S, 139°W: this is in agreement with results from dolerites of similar age from two other areas in Antarctica. Such demonstrations of uniformity are powerful evidence for the correctness of the geocentric dipole model for the ancient Earth's field, and for the reliability of paleomagnetic results.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422070

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

The known dates and extents of the breakout of the winter fast ice near the United States and New Zealand bases are listed.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422071

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

Current measurements and serial temperature and salinity observations made in McMurdo Sound during the 1960–61 summer are presented. Most of the current measurements were at two sites close to Cape Armitage, the southern extremity of Ross Island;; these show a residual current of about half a knot flowing towards the Ross Ice Shelf from McMurdo Sound, the fastest currents being close to the sea bottom. Harmonic constants were calculated for the tidal current components.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422072

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

The topography of Antarctica is dominated by systems of block-faulted mountain ranges and marginal troughs radiating from near the South Pole, and by two systems of volcanoes. Some centres of both the alkaline McMurdo Volcanics and the andesitic Scotia Arc Volcanics are still active.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422073

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

The first magnetic observations in the Ross Dependency were made by Sir James Clark Ross in 1840. Since then various expeditions have carried out magnetic measurements, but until the beginning of the International Geophysical Year (IGY) the results were scanty. During and since the IGY much magnetic information has been accumulated for this area, on land, in the airs and at sea. An analysis of this information is presented, from which it is clear that satisfactory estimates of the secular variation can be obtained only by continuing the magnetic observatories established during the IGY. The change in total magnetic force since the days of Ross is shown by comparing his chart with one published by Adams and Christoffel for 1958–60.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422074

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

In the course of a 1961–62 summer cruise on U.S.S.Burton Island, a landing was made on Australian Antarctic Territory at Cape Denison in Commonwealth Bay, the site of the 1911–14 Australasian Antarctic Expedition's base. A series of magnetic observations was made from which the approximate position of the south magnetic pole was determined to be about 671/2°S latitude and 140°E longitude.

ISSN:0028-8306    

DOI:10.1080/00288306.1963.10422075

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor