摘要:

What happens to bare rock and icy surfaces when they lie exposed to the interplanetary space environment for millions of years? This fundamental question has important implications for the interpretation of remotely sensed data, whether obtained by telescope or spacecraft. It is also, of course, very difficult to answer, but planetary geologists and field and particle physicists are working together to do so.

ISSN:0002-8606    

DOI:10.1029/96EO00094

年代:1996

数据来源: WILEY

摘要:

Modern Glacial Environments: Processes, Dynamics and Sedimentsfocuses on the processes involved in forming the glacial landscape. Approximately 30% of the Earth's land surface was covered by ice during the Pleistocene. The landscape formed by the great ice sheets still intrigues the scientific world. Today present‐day ice sheets are used to investigate the processes that created the glacial landscape and the landscape, in turn, is used to deduce the behavior of former ice sheets. This view is a simplification but essentially true; glaciologists and glacial geologists are studying the same process‐morphological system to achieve different goals.Modern Glacial Environments: Processes, Dynamics and Sediments, edited by John Menzies, aims to bridge the gap created by this division, a feat never before attempted in a single vol

ISSN:0002-8606    

DOI:10.1029/96EO00096

年代:1996

数据来源: WILEY

摘要:

I tend to agree with Michael Darzi that the budgetary attacks being brought to bear by Congress are the greater problem for science, but it was the growing rift with the environmental community that most surprised me during my year on Capitol Hill. As a card‐carrying member of several environmental groups, I was disturbed that a movement that had, as Darzi rightly points out, spurred many crucial areas of scientific research, was adopting a know‐nothing approach even when common interests exist.As to the solution, I could not agree more with Darzi that better communication is only one step toward greater activism, particularly at the grassroots le

ISSN:0002-8606    

DOI:10.1029/EO077i015p00143-02

年代:1996

数据来源: WILEY

摘要:

An international group of geologists met in Edinburgh, Scotland, in September 1995 to discuss recent progress in understanding the interrelationships between rock deformation and fluid flow. Channeled flow of magmas or volatile fluids in crustal fractures is a familiar concept, but the emphasis of research into deformation‐enhanced fluid flow is moving toward an analysis of rock transport properties during ductile, rather than brittle, deformation. This subject is applicable to the complete spectrum of fluid‐bearing environments in the Earth including the movement of volatiles (for example, H2O and CO2) during crustal metamorphism, and the extraction of basaltic melt from the mantle. Under the aegis of the Metamorphic, Tectonic and Volcanic Studies Groups of the Geological Society of London, and the Mineralogical Society, a 3‐day meeting was convened to bring together scientists working on all aspects of this diverse problem. The meeting concentrated on several major themes: segregation, ascent, and emplacement of granitic magmas; the extraction of basalt from partially molten mantle; and devolatilization of metamorphic

ISSN:0002-8606    

DOI:10.1029/96EO00098

年代:1996

数据来源: WILEY