Late Mesozoic and Cenozoic palaeomagnetism of Australia?I. A redetermined apparent polar wander path
نویسندگان
چکیده
منابع مشابه
Late cretaceous true polar wander: not so fast.
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...
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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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Mid-Mesozoic kalligrammatid lacewings (Neuroptera) entered the fossil record 165 million years ago (Ma) and disappeared 45 Ma later. Extant papilionoid butterflies (Lepidoptera) probably originated 80-70 Ma, long after kalligrammatids became extinct. Although poor preservation of kalligrammatid fossils previously prevented their detailed morphological and ecological characterization, we examine...
متن کاملTrue Polar Wander driven by late-stage volcanism and the distribution of paleopolar deposits on Mars
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...
متن کاملPaleomagnetism of the lower two unconformity-bounded sequences of the Waterberg Group, South Africa: Towards a better-defined apparent polar wander path for the Paleoproterozoic Kaapvaal Craton
Paleomagnetic data from more than 250 samples of the lower part of the Waterberg Group (Nylstroom Subgroup) are reported in order to reevaluate the apparent polar wander path (APWP) of the Kaapvaal craton during the Paleoproterozoic Era. Our study broadly confirms the established APWP, but reveals some previously unidentified complexities in the time interval ~2.05 Ga to ~1.87 Ga. A primary rem...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1985
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1985.tb06494.x