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1. |
Continental rifting: Progress and outlook |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 29,
1981,
Page 585-586
Brian H. Baker,
Paul Morgan,
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摘要:
Increased research activity on continental rifts has led to a flood of new data in the last 15 years, but there is little consensus about the basic mechanisms and causes of rifting. The well‐known association of taphrogenic features—doming, faulting, and volcanism—is widely regarded as the result of asthenosphere convection and lithosphere thinning. This concept is supported by observations of long‐wavelength negative Bouguer anomalies, and of subnormalPnvelocities in the upper mantle, resulting from convective mass and heat transfer into the base of the lithosphere. Doming, and in some instances faulting, is the result of isostatic adjustment to the resulting expansion. The crust of rifts is abnormally thin (70–80% of normal) and contains high‐density rocks assumed to be primarily intrusive basic igneous rocks. The collapse of rift lloors may be the consequence of stress‐induced lateral extension in the upper crust, possibly assisted by a mass excess of mafic intrusions in the rifted crust. Anomalous electrical conductivity (low) and heat flow (high) are the result of heating and magmatic and hydrothe
ISSN:0002-8606
DOI:10.1029/EO062i029p00585-01
年代:1981
数据来源: WILEY
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2. |
Low‐gravity materials processing |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 29,
1981,
Page 587-587
Peter M. Bell,
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摘要:
The concept of growing crystals and of doing biological studies in the low‐gravity space environment assumes that the absence of most, or all, of the influences of the earth's gravitational field on chemical and biological reactions is an important factor—at least important enough to justify costly testing.One normally thinks of the effects of the gravitational field as being like the effects of any othef field, electric or magnetic, on a thermodynamic process. In the simplest terms, there is work done as parts of a system travel through a gravitational field; a more exact statement would be that the free energy of a system, and hence the state of equilibrium, depends on the position within a gravitational field. The thermodynamic effects of the earth's gravitational field (the equation for the changes in free energy caused by differences in position within the field) are subtle but could be important in chemical and biological proces
ISSN:0002-8606
DOI:10.1029/EO062i029p00587-01
年代:1981
数据来源: WILEY
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3. |
Highlights: Spring Council Meeting |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 29,
1981,
Page 588-588
Anonymous,
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摘要:
Council members present at the May 24, 1981, meeting were Keiiti Aki, Steven Burges (for Jim Wallis), Peter S. Eagleson, E. R. Engdahl, Charles E. Helsley, James R. Heirtzler, Carl Kisslinger, Leslie H. Meredith, Chris N. K. Mooers, Norman F. Ness, Marcia M. Neugebauer, James J. O'Brien, Richard Rapp, Carl Sagan, James C. Savage, Joseph V. Smith, Fred Spilhaus, Donald L. Turcotte, James A. Van Allen, J. Tuzo Wilson, and Jay Winston (for Elmar R. Reiter until his arrival at 6:50 P.M.). David Strangway, representing the Canadian Geophysical Union, and Peter Steinhauser, representing the European Geophysical Society, were special observers at the meeting. Council meetings are open, and a number of section secretaries, committee chairmen, journal editors, and other members attended. The following major actions were adopted by the Council:The experiment of publishing oceanography and lower‐atmosphere papers in JGR Green issues alternate to those containing upper‐atmosphere papers will be continued through 1982. From preliminary indications the experiment seems to be working, but a full year of data, including a renewal cycle, is needed to assess the success of the experiment. Final decision will be made prior to the 1983 dues noti
ISSN:0002-8606
DOI:10.1029/EO062i029p00588-01
年代:1981
数据来源: WILEY
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4. |
Travel grants for IAGA and IAMAP assemblies awarded |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 29,
1981,
Page 590-590
Anonymous,
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摘要:
AGU recently received from the National Science Foundation block travel grants for U.S. scientists to attend the Third Scientific Assembly of the International Association of Meterorology and Atmospheric Physics (IAMAP) to be held in Hamburg, Germany, August 17–28, 1981, and the Fourth Scientific Assembly of the International Association of Geomagnetism and Aeronomy (IAGA) to be held august 3–15, 1981 in Edinburgh, Scotland. The IAMAP proposal was cosponsored by American Meterorological Soci
ISSN:0002-8606
DOI:10.1029/EO062i029p00590
年代:1981
数据来源: WILEY
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5. |
1981 Spring Meeting Report |
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Eos, Transactions American Geophysical Union,
Volume 62,
Issue 29,
1981,
Page 591-591
Anonymous,
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摘要:
Approximately 2150 participants registered for the 1981 Spring Meeting. More than 1500 papers were presented.The spaciousness of the Baltimore Convention Center provided ample opportunity for attendees to exchange ideas and interact with their colleagues. Here are some candid shots.
ISSN:0002-8606
DOI:10.1029/EO062i029p00591
年代:1981
数据来源: WILEY
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