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Volume 32 (1980)
- Issue 12 Pages 721-
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- Issue 4 Pages 181-
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Volume 32, Issue Supplement3
Displaying 1-13 of 13 articles from this issue
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M. W. McElhinny1980 Volume 32 Issue Supplement3 Pages SIIIi
Published: 1980
Released on J-STAGE: August 11, 2011
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1980 Volume 32 Issue Supplement3 Pages SIIIiii
Published: 1980
Released on J-STAGE: August 11, 2011
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B. J. J. EMBLETON, K. L. MCDONNELL1980 Volume 32 Issue Supplement3 Pages SIII1-SIII10
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSLate Permian and Early Triassic sediments of the Narrabeen Group have been sampled in the coastal section of the Sydney Basin between Wybung Head (the top of the Newcastle Coal Measures to the north of Sydney) and Coal Cliff (above the Bulli Seam south of Sydney). An ancient magnetisation (presumed original) has been isolated only from the red claystone component of the entire section. The magnetisation of the green and buff coloured medium/coarse grained sandstones belonging to the Munmorah Conglomerate and the Tuggerah Formation has been reset during the Late Mesozoic period of magnetic overprinting. This event is primarily responsible for frustrating an attempt to describe properly the magnetostratigraphic record for the Palaeozoic/Mesozoic boundary from deposits in the eastern part of the Sydney Basin. The primary magnetisation of the red beds has survived magnetic reprinting but evidence of over-printing is present during thermal cleaning to 600°C. The detailed magnetostratigraphy of the red beds was revealed after thermal treatment at 650°C and 660°C. The high temperature directions yield a palaeomagnetic south pole for the Patonga Claystone at latitude 30.4°S, longitude 146.9°E, α95=7.8° and the difference vectors calculated from the low temperature directions yield an overprint south pole position at latitude 57.3°S, longitude 143.4°E, α95=3.6°.
In the light of recent palaeomagnetic investigations in southeastern Australia and the recognition of ubiquitous Late Mesozoic magnetic overprinting, a reassessment of earlier results based upon samples collected at least in the eastern regions of the Sydney Basin may be required.View full abstractDownload PDF (788K) -
Bruce R. GOLEBY1980 Volume 32 Issue Supplement3 Pages SIII11-SIII21
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe palaeomagnetism of 22 formations from the Cowra Trough and Molong High of South East Australia have been studied. Samples of Ordovician through Middle Devonian age were collected in three major areas, covering a time period crucial to the understanding of the Palaeozoic apparent polar wander path of Australia. Five magnetic components have been identified: 1) A recent field overprint, 2) a secondary component related to the break up of Australia and Antarctica, 3) a predominent Devonian secondary overprint associated with the major orogenic episode, 4) a weak Silurian overprint associated with an earlier orogenic episode, and 5) primary magnetic components ranging in age from the Ordovician to the Devonian. The directions obtained enable construction of a well defined polar wander path for South East Australia and Australia as a whole.View full abstractDownload PDF (1170K) -
A. N. KHRAMOV, V. P. RODIONOV1980 Volume 32 Issue Supplement3 Pages SIII23-SIII37
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSAn analysis of the palaeomagnetic data from the Siberian and Russian plates, Kazakhstan, and the Scythian and Turanian blocks permits us to reconstruct the history of their horizontal movements from the Late Proterozoic through to the Triassic. The Siberian plate originally consisted of four separate blocks: the Anabar craton, the Aldan shield, and the northern and western Baikalian blocks. Situated in southern subequatorial latitudes during the late Proterozoic, these separate units collided at the beginning of the Palaeozoic to form the Siberian plate. During the Palaeozoic the Siberian plate moved northward along a great circle path through the subtropics, across the equator, and eventually past the North Pole. During the early and middle Palaeozoic the Russian plate was located in low southern latitudes. It moved northward during the Palaeozoic, colliding with Siberia, Kazakhstan, and the Scythian and Turanian blocks during the Permian.View full abstractDownload PDF (1503K) -
P. MOREL, E. IRVING1980 Volume 32 Issue Supplement3 Pages SIII39-SIII45
Published: 1980
Released on J-STAGE: March 12, 2010
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Václav BUCHA1980 Volume 32 Issue Supplement3 Pages SIII47-SIII60
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe pattern of palaeomagnetic curves with particular regard to the lower Palaeozoic epochs which was revised by a suitable choice of polarity of data for the individual continents is given. The investigated distribution of the continental blocks for the individual geological epochs agrees with all the palaeontological and geological facts. The comparison of the model of continental drift with the occurrence of orogenic events and some palaeontological conclusions was carried out.View full abstractDownload PDF (1251K) -
Christopher R. SCOTESE, Sigmund SNELSON, William C. ROSS, Linda P. DOD ...1980 Volume 32 Issue Supplement3 Pages SIII61-SIII70
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSA computer animation of continental drift has been produced which illustrates the movements of the continents during the last 545 million years. Beginning in the Late Cambrian, the animation shows the sequence of continental collisions which by the end of the Paleozoic formed the supercontinent, Pangaea. The remainder of the film describes the breakup of Pangaea and the subsequent formation of the world's ocean basins. The animation was made at Shell Development Company, Houston, Texas. It is entitled, Dynamic Continents, and is black and white, silent, and runs approximately 5min.View full abstractDownload PDF (984K) -
Daniel A. VALENCIO1980 Volume 32 Issue Supplement3 Pages SIII71-SIII75
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSPalaeomagnetic data from samples collected in a rock sequence of tuffs and shales (Suri Formation), exposed in northwestern Argentina, indicate that the geomagnetic field had reversed polarity in Llanvirnian time. The samples from the top of the sequence also record, at least, an excursion of the geomagnetic field.
The palaeomagnetic study carried out on samples collected in a rock sequence of shallow marine sediments of Late Precambrian age (La Tinta Formation), exposed in central-eastern Argentina, indicates that the geomagnetic field had alternating periods of normal and reversed polarity in that geological time.
The positions of the palaeomagnetic poles for the Suri and La Tinta Formations are consistent with the interpretation that Gondwana was a unit as far back as Late Precambrian and with the occurrences of Upper Ordovician and Upper Precambrian glacial deposits across Africa and Australia, respectively. They do not, however, exclude models involving the opening and closing of minor seas. Particularly, the position of La Tinta pole is consistent with the interpretation which suggests that the sediments of this formation and those of the Nama Group (Africa) were deposited in a common shallow marine basin.View full abstractDownload PDF (486K) -
Ernst R. DEUTSCH1980 Volume 32 Issue Supplement3 Pages SIII77-SIII98
Published: 1980
Released on J-STAGE: March 12, 2010
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A. N. KHRAMOV, V. P. RODIONOV1980 Volume 32 Issue Supplement3 Pages SIII99-SIII115
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe Palaeozoic reversal sequence is represented by complex rhythms with characteristic times of (5-7)×107, (1-4)×107 and (1-2)×106y. The first order units recognized are Arginian (R) 590-535m. y., Siberian (Rn) 535-485m. y., Baikalian (Nr) 485-430m. y., Sayanian (Rn) 430-360m. y., Donetsk (Rn) 360-300m. y., Kiaman (R) 300-240m. y., and Illawarra (NR) 240-215m. y. Three types of Palaeozoic field transitions have been recognized: 1. “sudden” reversals (single or repeated), 2. reversals with a considerable dispersion of palaeomagnetic directions, 3. reversals with loop-wise rotations of the field. The latter may result from the concurrence of axial and equatorial dipoles. Reversals usually occur with a 4 to 10 times lower field intensity. The time span for the complete transition ranges from 8×103 to 3×105y. Peculiarities of the reversals have been traced over strike distances of 1600km. Angular constituents of paleosecular variation have components with characteristic times of (4-8)×103y. and 3×104y. The latter is characterized by standard deviations of 6 to 10 degrees in stable field epochs and up to 20 degrees in intervals of frequent reversals.
The field of the geocentric axial dipole is a good first approximation of time-averaged field. However, the occasional presence of an irreversible equatorial dipole, controls the shape of geomagnetic reversals of the 3rd type.View full abstractDownload PDF (1864K) -
H. C. SOFFEL, H. G. FÖRSTER1980 Volume 32 Issue Supplement3 Pages SIII117-SIII135
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSPalaeomagnetic investigations have been made on mainly igneous rocks and red sandstones from 167 sites in Central Iran covering the time interval between Quaternary and Late Precambrian. Based on these data an apparent polar wander path has been established for Central Iran which shows marked differences with the apparent polar wander path of Eurasia (IRvING, 1977) but some resemblances with the apparent polar wander paths of the Gondwana landmasses India and Africa (KLooTWuK, 1976; MCELHINNY, 1973; IRVING, 1977). The palaeoremanence directions indicate a counterclockwise rotation of more than 90° of Central Iran with respect to Eurasia since Upper Paleozoic. According to the palaeolatitudes and other, mainly geological evidence, Central Iran was part of the Gondwana landmasses throughout parts of the Paleozoic. It was separated much earlier from Gondwana than India and had also a much earlier (possibly Triassic) collision with Eurasia.View full abstractDownload PDF (1972K) -
Daniel A. VALENCIO1980 Volume 32 Issue Supplement3 Pages SIII137-SIII142
Published: 1980
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSPalaeomagnetic data from samples collected in rock sequences of sediments and igneous rocks of Late Palaeozoic and Triassic age exposed in northwestern Argentina are summarized. On basis of these data a composite magnetic stratigraphy for the Late Carboniferous, Permian and Early and Middle Triassic was prepared.
They record two normal polarity events at the Late Carboniferous and Middle Permian which are correlated with the Debal'tseva Zone and the Quebrada del Pimiento Normal Event, respectively.
They also record short-lived normal polarity events and geomagnetic excursions at the Late Permian-Early Triassic, which are correlated with the Illawarra Zone, and after them a long period of predominant normal polarity. This is correlated with the normal quiet interval reported within the Triassic; there are many geomagnetic excursions within this interval which are being investigated.View full abstractDownload PDF (628K)
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