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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Reversal ideas up-ended

Article Abstract:

New research casts doubt on the hypotheses that the virtual geomagnetic poles tend to move along one of two paths during a geomagnetic reversal and that motions the in the Earth's core cause convection in the mantle and plate tectonics. J.-P. Valet and colleagues re-examined the data and concluded that the poles' path during reversals might have been random rather than following a route through either North and South America or eastern Asia and Australia. The suggestion that the mantle influences the core during reversals remains doubtful.

Author: McFadden, Phil
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
Earth, Core (Geology), Geomagnetic reversals

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Tilt and northward offset of Cordilleran batholiths resolved using igneous barometry

Article Abstract:

New methods of hornblende barometry can be used to correct paleomagnetic data for tectonic tilting. These corrections indicate that the Peninsular Ranges batholith (PRB) of southern and Baja California, and the Mount Stuart batholith (MSB) of Washington's Cascade Range have undergone both northward translation and significant tilting. The PRB has travelled approximately 1,000 km northward, the MSB approximately 2,900 km. The MSB also underwent clockwise rotation. The two batholiths probably came from the same magma arc.

Author: Ague, Jay J., Brandon, Mark T.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
Paleomagnetism, Batholiths

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Three's a crowd in California

Article Abstract:

Three powerful earthquakes occurring close to where three faults intersect off the northern California coast gave geologists a chance to examine the plate tectonic forces affecting the region. The earthquakes, which occurred on or shortly after Apr 25, 1992 with the respective magnitudes of 6.9, 6.2 and 6.5, resulted from the interaction of the San Andreas fault, the Cascadia subduction zone and the Mendocino transform fault where the Pacific and Gorda plates move past each other.

Author: Michael, Andrew
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
California, Natural history, Earthquakes, Faults (Geology)

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Subjects list: Research, Plate tectonics
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