منابع مشابه
GEOLOGICAL NOTES Quaternary Glacial-Interglacial Climate Cycles in Hawaii
The upper kilometer of the Hawaiian Scientific Drilling Program core consists of lavas that were emplaced subaerially, burying paleosols. These paleosols were preserved with minimal alteration and are used to construct a ∼330-kyr Quaternary climate record. Within the temporal resolution of this record, there appears to be a ∼100-kyr climate oscillation between cool-dry and warm-wet conditions, ...
متن کاملGeological Notes Diffusion of Water in Silicate Melts
The transport of water in silicate melts is examined from a theoretical point of view, taking into account the presence of both H20 and OH species. It was assumed that only H20 molecules may diffuse and that a constitutive relationship between the number density nH 0 of H20 molecules and the total water content (n:E) exists such that nH,o = g(n:E) . This is related to dissociation or to chemica...
متن کاملGEOLOGICAL NOTES Regional Paleoprecipitation Records from the Late Eocene and Oligocene of North America
The marine dO record indicates precipitous cooling or significant expansion of Antarctic ice volume across the Eocene-Oligocene epoch boundary at 33.7 Ma. This climatic step is also found in estimates of decreased paleoprecipitation from paleosols in Oregon, Montana, and Nebraska but is only a part of a long-term decline across the Eocene-Oligocene transition rather than a sudden shift. This su...
متن کاملGeological Sciences
Teach the Earth: The Science Education Resource Center (SERC) Portal for Geoscience Faculty (Carleton College). This portal is the gateway to thousands of pages of activities, workshops, course descriptions and more http://serc.carleton.edu/teachearth/index.html [1] See the SERC site Bringing Research on Learning to the Geosciences for a searchable database of articles on effective learning and...
متن کاملGeological Sciences
Teach the Earth: The Science Education Resource Center (SERC) Portal for Geoscience Faculty (Carleton College). This portal is the gateway to thousands of pages of activities, workshops, course descriptions and more http://serc.carleton.edu/teachearth/index.html [1] See the SERC site Bringing Research on Learning to the Geosciences for a searchable database of articles on effective learning and...
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ژورنال
عنوان ژورنال: Nature
سال: 1905
ISSN: 0028-0836,1476-4687
DOI: 10.1038/072284a0