摘要:

Optimum sites for low‐temperature (<150 °C) geothermal resource development in the technically stable eastern United States will probably be associated with crustal igneous rocks containing relatively high concentrations of radiogenic heat‐producing elements concealed beneath insulating blankets of sediments. Granitic rocks crop out over a large area of the central and southern Appalachian Piedmont and Blue Ridge and presumably extend eastward beneath the sedimentary cover of the Atlantic Coastal Plain. Choice of a site in the Atlantic Coastal Plain with a high geothermal resource potential depends on favorable (1) concentration of radiogenic elements in granitic rocks beneath a sedimentary insulator, (2) thermal conductivity of the sedimentary insulator, (3) thickness of the sedimentary insulator, and (4) reservoir conditions in the sedimentary rocks overlying the radioactive heat source. Values of heat generation for granitic rocks in the Piedmont are known to be at least as high as 17 HGU (1 heat generation unit=10‐13cal/cm3sec. Using the linear relationship between heat flow and heat generation observed for the southeastern United States, a heat generation of 14 HGU in granitic rocks beneath sediments with an average thermal conductivity of 4.2x10−3cal/sec‐cm‐ °C and a thickness of 2 km would yield a temperature of nearly 100°C at the base of the sedimentary section and a gradient of about 40°C/km in the sediments. We have logged approximately 250 wells in the Atlantic Coastal Plain, with temperature gradients in the range 15–45°C/km. Preliminary results suggest that the higher gradients are associated with negative Bouguer gravity anomalies and therefore probably with conceale

ISSN:0002-8606    

DOI:10.1029/EO061i001p00001

年代:1980

数据来源: WILEY

摘要:

What the AGU charges authors for publishing their work in its journals is and should be, to a certain extent, self regulating. It would be economically suicidal to charge less than necessary to meet the deficit beyond the income from subscribers, and it would also be self‐defeating to charge more than necessary and therefore discourage potential contributors. Costs are already sufficiently discouraging.The arguments given by Harrison in the November 6EOS, 60(45), for the differential in cost between copyrighted and public domain articles, however, concern the equitable sharing of those costs, and I take issue with the validity of the reasoning therei

ISSN:0002-8606    

DOI:10.1029/EO061i001p00002-01

年代:1980

数据来源: WILEY

摘要:

The National Science Foundation and the National Endowment for the Humanities have announced two programs to support projects that investigate ethics and values in science and technology.The first category of awards, Interdisciplinary Incentive Awards, are intended to permit scholars and practitioners to pursue specific, problem‐oriented activities, in association with specialists in fields other than one's own. The yearly stipend is $20,000. Up to 20 such awards will be mad

ISSN:0002-8606    

DOI:10.1029/EO061i001p00004-01

年代:1980

数据来源: WILEY