Late Mesozoic and Cenozoic palaeomagnetism of Australia?II. Implications for geomagnetism and true polar wander
نویسندگان
چکیده
منابع مشابه
True polar wander and supercontinents
I present a general model for true polar wander (TPW), in the context of supercontinents and simple modes of mantle convection. Old, mantle-stationary supercontinents shield their underlying mesosphere from the cooling effects of subduction, and an axis of mantle upwelling is established that is complementary to the downwelling girdle of subduction zones encircling the old supercontinent. The u...
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Using recalculated paleopoles from seamount anomaly modeling (SAM), Sager and Koppers (1) proposed an episode of rapid Late Cretaceous true polar wander (TPW). A critical review of the data used, however, suggests that Sager and Koppers have underestimated the effects that errors and data selection have on inferences of TPW and that they may not have adequately taken into account alternative ex...
متن کاملTheoretical constraints on true polar wander
[1] For the present geologic epoch, true polar wander (TPW) is relatively small, but simple theoretical considerations suggest that it could have been larger in other epochs. In this work, we use scaling arguments to assess the qualitative behavior of TPW and a simple Maxwell model to analytically describe how changes in mass anomalies translate into TPW. Unlike previous work, we derive simple ...
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a Earth and Planetary Science, 307 McCone Hall #4767, University of California, Berkeley, CA 94720, United States b Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington DC, United States c Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street Cambridge, MA, United States d Department of Physics, University of Toronto, 60 St. George Stree...
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A number of magnetic anomalies are present along the northern edge of the lunar South Pole-Aitken (SPA) basin. A variety of hypotheses for their formation have been proposed, but an in-depth study of their properties has not been performed. Here we use two different methods to invert for their source body characteristics: one that completely searches a small parameter space of less than ten uni...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1985
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1985.tb06495.x