Paleomagnetic events in the brunhes and Matuyama epochs identified from magnetic profiles reduced to the pole

Emilia, David A.; Heinrichs, Donald F.

doi:10.1007/bf00286745

Cited by 17 publications

(9 citation statements)

References 26 publications

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“…Its interpolated numerical age of about 2.14 m.y. suggests a correlation to the "X" event (McDougall, 1977), which was previously identified in marine magnetic anomaly data (Heirtzler et al, 1968;Emilia and Heinrichs, 1972). Both the Kaena and Mammoth events are present in the Gauss Epoch, indicating that the paleomagnetic record is also continuous and complete in this part of the hole.…”

Section: Site 579supporting

confidence: 67%

The Magnetostratigraphy of Northwest Pacific Sediments, Deep Sea Drilling Project Leg 86

Bleil¹

1985

Initial Reports of the Deep Sea Drilling Project

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Results of paleomagnetic analyses of pelagic sediment sequences recovered in the Northwest Pacific during Deep Sea Drilling Project Leg 86 are presented. On the basis of these data, almost complete late Cenozoic magnetostratigraphies are established for each drill site.At Site 577, on the Shatsky Rise, a stratigraphic duplication of Late Cretaceous to middle Eocene sequences was achieved using the hydraulic piston coring technique. For the first time, a detailed paleomagnetic study of this period using largely undisturbed and complete sedimentary columns from the Pacific region was possible. Available biostratigraphy and stable isotope stratigraphy data allowed a positive correlation of the downhole magnetic reversal patterns with a calibrated geomagnetic polarity time scale. In general, the results obtained are in remarkable agreement with other recently published magnetostratigraphies from various parts of the world. Therefore, they represent a high quality framework for an early Tertiary magnetobiochronology including the Cretaceous/Tertiary boundary interval.

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Section: Site 579supporting

confidence: 67%

The Magnetostratigraphy of Northwest Pacific Sediments, Deep Sea Drilling Project Leg 86

Bleil¹

1985

Initial Reports of the Deep Sea Drilling Project

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“…Similarly, as the formation's marine microfauna and microflora are of warm temperate aspect, it is unlikely that the lower polarity reversal represents the transition between the Gauss (normal) and Matuyama epochs, which occurred towards the base of the basal Pleistocene Praetiglian cold stage (Zagwijn, 1975, fig. The normal polarity events are provisionally correlated with the short-lived Reunion and 'X' events, dated at about 2.02±0.02 million years and 2.17 + 0.01 million years respectively (Emilia & Heinrichs 1972). The normal polarity events are provisionally correlated with the short-lived Reunion and 'X' events, dated at about 2.02±0.02 million years and 2.17 + 0.01 million years respectively (Emilia & Heinrichs 1972).…”

Section: Palaeomagnetism Of the Westkapelle Ground Formationmentioning

confidence: 94%

Lower pleistocene dinoflagellate cyst, foraminiferal and pollen assemblages in four boreholes in the Southern North Sea

Cameron

Bonny²,

Gregory

et al. 1984

Geol. Mag.

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Neogene and Lower Pleistocene stratigraphy in the Southern North Sea has been investigated in four I.G.S. boreholes between East Anglia and the Netherlands. The foraminifera of the Red Crag Formation in Borehole 81/51 are closely similar to Upper Pliocene assemblages in Holland. The overlying succession is clearly punctuated by unconformities in seismic profiles, separating four early Pleistocene formations in the boreholes, and indicating intervals of significant stratigraphic hiatus offshore. The Westkapelle Ground and Smith's Knoll Formations correlate with Thurnian and Antian Stage deposits in East Anglia. Pollen spectra in the Winterton Shoal and Yarmouth Roads Formations are similar to Baventian and Bramertonian assemblages in Britain. The autochthonous marine and allochthonous terrestrial microfauna and flora provide conflicting evidence of early Pleistocene palaeoclimate. The dinoflagellate cysts and foraminifera indicate that each formation was deposited in a warm temperate neritic environment. The pollen record, containing evidence of fluctuation between boreal and mixed coniferous-deciduous regional forest cover, suggests alternation between cool and warm temperate palaeoclimate.

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“…In support of this contention we note that the Reunion event is of very short duration (McDougall & Watkins 1973) and is not observed either in deep-sea sediment cores or from magnetic anomaly profiles. The analyses of Emilia & Hendricks (1972) show that there is evidence for such short events when special techniques are applied to magnetic anomaly profiIes. Also it is possible that excursions of the geomagnetic field such as have been observed by Doell & Cox (1972) and Barbetti & McElhinny (1972) occurred more frequently.…”

Section: (A) Geomagnetic Variationsmentioning

confidence: 97%

A Synthesis of Australian Cenozoic Palaeomagnetic Results

McElhinny

Embleton

Wellman

1974

Geophysical Journal International

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Large numbers of K-Ar determinations have now been made on the Cenozoic volcanic rocks of eastern Australia. These age determinations make it possible to synthesize the palaeomagnetic results from 357 lava flows studied to date by dividing them into six age groups ranging from 60 My to Recent. We use the criterion that palaeomagnetic poles with VGP co-latitudes > 40" are intermediate between normal and reversed, as has been demonstrated in Iceland. Overall 11-15 per cent of flows are classified as intermediate in this way, whereas only 3 per cent of flows with ages < 5 My and 20-30 per cent in the time range 35-25 My are inter-mediate. The observations from the younger group are consistent with that to be expected from the known polarity time-scale for the last 5 My. Those from the older group suggest the frequency of reversals was much greater than had previously been supposed during the mid-Tertiary. The apparent polar wander path derived from these results shows a distinct zig-zag with a westerly excursion around 30My and a knee around 18 My.

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Paleomagnetic events in the brunhes and Matuyama epochs identified from magnetic profiles reduced to the pole

Cited by 17 publications

References 26 publications

The Magnetostratigraphy of Northwest Pacific Sediments, Deep Sea Drilling Project Leg 86

The Magnetostratigraphy of Northwest Pacific Sediments, Deep Sea Drilling Project Leg 86

Lower pleistocene dinoflagellate cyst, foraminiferal and pollen assemblages in four boreholes in the Southern North Sea

A Synthesis of Australian Cenozoic Palaeomagnetic Results

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