Palaeomagnetism of some Indian Rocks

Athavale, R. N.; Radhakrishnumurty, C.; Sahasrabudhe, P. W.

doi:10.1111/j.1365-246x.1963.tb05552.x

Cited by 67 publications

(17 citation statements)

References 9 publications

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“…The latter result shows a declination, corresponding to the harder component but with a lower dip (D=79.5", 1=+8", Table I). This direction coincides with results from a reconnaissance study on rocks from the same Trap (Athavale et al, 1963; 0=70", 1=+3", 8 samples), which were obtained from thermal studies and A.F.-treatment up to 200 Oe peak value only. Our preference for the former result is based on the higher coercivity of this ma~etization component and the better grouped directions.…”

Section: Discussionsupporting

confidence: 89%

“…McElhinny, 1969); 3 = Cuddapah shales and sandstones (Athavale et al,, 1970);4 = Kaimur Sandstones (McElhinny, 1968); 5 = Malani Rhyolites (Athavale et al, 1963); 6 = Upper Bhander Sandstones (Klootwijk, 1973a);7 = Purple Sandstones (McElhinny, 1969b);8 = Salt Pseudomorph Beds (Wensink, 1972). a = Hyderabad dyke (Verma et al, 1968); b = Banded hematite jasper and quartzite (Athavale et al, 1970); c = Chlitoor dyke (Athavale et al, 1970); d = Mundwara complex (Athavale et al, 1963); e = Veldurti Hematite (Verma et al, 1966). 5 The hematite deposits are younger than the base of the Cuddapah System -1400 m.y.…”

Section: Discussiommentioning

confidence: 99%

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Palaeomagnetic data from the precambrian Gwalior traps, Central India

Klootwijk

1974

Tectonophysics

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From alternating-field and thermal demagnetization studies on two dolerite "Traps" in the Gwalior Series (Central India), dated at 1830 f200 m.y., three different palaeomagnetic directions could be distinguished. The characteristic magnetization component, which is considered as the primary magnetization, has a mean direction: D=78', Z=+34.5", a95=5O, k=369, N=4 (Pole: 155.5'E1g0N, dp=3', dm=5.5'). A comparison of the presented data with other Precambrian and Phanerozoic data from the Indian subcontinent might suggest that the Indian subcontinent underwent a continuous anticlockwise rotational movement during the last 1800 m.y.

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Section: Discussionsupporting

confidence: 89%

Section: Discussiommentioning

confidence: 99%

Palaeomagnetic data from the precambrian Gwalior traps, Central India

Klootwijk

1974

Tectonophysics

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“…Paleomagnetic studies on the Upper Cretaceous to Lower Eocene plateau basalts of the Deccan traps (DEuTSCH et al, 1959) as well as on the Jurassic Rajmahal traps (CLEGG et al, 1958) and Sylhet traps (ATHAVALE et al, 1963) have demonstrated that during the Upper Mesozoic India was situated south of the equator.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism of some Gondwana red beds from central India

Wensink

1968

Palaeogeography, Palaeoclimatology, Palaeoecology

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SUMMARYOriented samples were collected for paleomagnetic research from red horizons of the Gondwana sediments at a few localities in central India. The specimens were subjected to both alternating-field and thermal demagnetization and were measured on astatic magnetometers. Usually a stable direction of magnetization was observed only after thermal treatment.The following results were obtained:(1) The Upper Permian Kamthi Beds reveal a mean direction of magnetization given by D = 79.4 °, I = +61.6 ° (pole position 21.05°S 50.4°W; dp= 2.8 ° and dm = 3.7°);(2) The Lower Triassic Mangli Beds have D = 100.1 °, I = +62.8 ° (pole position 7.3°S 55.7°W; dp = 5.7 ° and dm = 7.3°);(3) The Upper Triassic Pachmarhi Beds have D = 117.2 °, I = +48.9 ° (pole position 10.15°N 49.9°W; dp = 4.0 ° and dm= 6.1 °).These results combined with earlier data indicate that the Indian subcontinent has made a sinistral rotation of about 90 ° during Upper Paleozoic through Mesozoic times, without a considerable meridional shift.

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“…513 in Klootwijk, 1974b) from 645 m.y. at the time of the extrusion of the Malani rhyofites (Athavale et al, 1963) to the Lower Cambrian.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

The paleomagnetism of the Speckled Sandstones of Early Permian Age from the Salt Range, Pakistan

Wensink

1975

Tectonophysics

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Paleomagnetic results are presented from the Speckled Sandstones, of probably Early Permian age, from the Salt Range in Pakistan. The analysis includes 86 specimens from nine sites collected at three individual localities. All specimens were subjected to progressive, thermal treatment which revealed the characteristic directions of magnetization, with a mean value,of D = 92.2O, Z = +46.7', ags = 13ON, 137.5OE, with 6, = 5.1° and 6, = 7.3'. The paleomagnetic pole is located at 9.5'. This position agrees well with the paleomagnetic pole positions derived from Indian rocks of about the same age, thus giving no reason to postulate relative movements between the Salt Range and the Indian basement since the Carboniferous. INTRODUCTIONThe ravines at the southern escarpment of the Salt Range in Pakistan exhibit beautiful geological sections. In general, th8 rock sequence starts with an impressive suite of sediments of Cambrian age qnd up to 400 m thick, comprising salts, red silts and sandstones, shales a@ dolomites. A considerable hiatus exists between these sediments and the oveylying detrital and calcareous deposits, which have Late Carboniferous and Permian age. Limestones of Eocene age cover the Upper Paleozoic rocks. Next follow the sediments of the Siwalik formation; these continental deposits of Miocene and Pliocene age are mainly exposed on the Potwar plateau (Fig, 1). PERMO-CARBONIFERQUS DEPOSITSIn the Salt Range the basal layers of the sediments of Permo-Carboniferous age unconformably cover the rocks of the Cambrian. In the stratigraphical description of the rocks in the Salt Range we mainly 72-E73"E

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Palaeomagnetism of some Indian Rocks

Cited by 67 publications

References 9 publications

Palaeomagnetic data from the precambrian Gwalior traps, Central India

Palaeomagnetic data from the precambrian Gwalior traps, Central India

Paleomagnetism of some Gondwana red beds from central India

The paleomagnetism of the Speckled Sandstones of Early Permian Age from the Salt Range, Pakistan

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