منابع مشابه
The ‘cool-tropics paradox’ in palaeoclimatology
Over one thousand lunar transient events have been reported since the 1600s when telescopes were fi rst developed. Astronomer William Herschel during 1783–1787 reported several apparent lunar volcanic emissions: ‘I perceived in the dark part of the Moon a luminous spot. It had the appearance of a red star.’ Four years later Herschel wrote, ‘I perceive three volcanoes ... The third shows signs o...
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State-of-the-art measurements of the direction and intensity of Earth's ancient magnetic field have made important contributions to our understanding of the geology and palaeogeography of Precambrian Earth. The PALEOMAGIA and PINT(QPI) databases provide thorough public collections of important palaeomagnetic data of this kind. They comprise more than 4,100 observations in total and have been es...
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During the last decade Quaternary pollen analysis has developed towards improved pollen-taxonomical precision, automated pollen identification and more rigorous definition of pollen assemblage zones. There have been significant efforts to model the spatial representation of pollen records in lake sediments which is important for more precise interpretation of the pollen records in terms of past...
متن کاملPalaeomagnetism of the Bay an Gol Formation , western Mongolia
Oriented samples of the Lov.'er Cambrian Sayan Go! Formation from Salaany Go!, Mongolia, were collected at roughly 5 m stratigraphic intervals for palaeomagnetic analysis. Progressive alternatingfield and thermal demagnetization isolated two magnetic components: a present-field overprint, typically removed by 10 mT fields and -200 °C heating: and a high-coercivity, high-unblocking-temperature (...
متن کاملPalaeomagnetism of the Ordovician dolerites of the Crozon Peninsula (France)
In order to obtain a Lower Palaeozoic pole for the Armorican Massif and to test the origin of the Ibero-Armorican arc, the Ordovician dolerites of the Crozon peninsula have been palaeomagnetically studied. The samples show a multicomponent magnetization which has been revealed by AF and thermal demagnetization and thoroughly investigated with rock magnetic experiments, polished section examinat...
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ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1962
ISSN: 0022-1392
DOI: 10.5636/jgg.13.127