Robert J Fleck
Robert is a Scientist Emeritus with the Geology, Minerals, Energy, and Geophysics Science Center
Education and Certifications
Ph.D., Geology, University of California, Berkeley, 1967
M.S., Geology, Stanford University, 1967
A.B., Geology, University of California, Berkeley, 1962
Affiliations and Memberships*
2002 to present, The Society of Economic Geologists
1968 to present, Geological Society of America
1968 to present, Geological Society of America
1967 to present, Geochemical Society
1967 to present, American Geophysical Union
1970 to unknown, International Assoc. Geochemistry & Cosmochemistry
Science and Products
Rubidium-strontium geochronology and plate-tectonic evolution of the southern part of the Arabian Shield
Geochronology of the Arabian Shield, western Saudi Arabia: K-Ar results
Southern Patagonia—Glacial events between 4 m.y. and 1 m.y. ago
Science and Products
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Filter Total Items: 39
Rubidium-strontium geochronology and plate-tectonic evolution of the southern part of the Arabian Shield
Rubidium-strontium studies of Precambrian volcanic and plutonic rocks of the Arabian Shield document an early development of the Arabian craton between 900 and 680 m.y. (million years) ago. Geologic studies indicate an island-arc environment characterized by andesitic (dioritic) magmas, volcaniclastic sedimentation, rapid deposition, and contemporaneous deformation along north or northwest-trendinAuthorsRobert J. Fleck, W.R. Greenwood, D. G. Hadley, R.E. Anderson, D. L. SchmidtGeochronology of the Arabian Shield, western Saudi Arabia: K-Ar results
An orogenic event, correlated with the Pan-African event in eastern Africa, affected the Arabian Peninsula between 510 and 610 m.y. ago and is well-recorded geochronologically. The event probably included two thermal pulses or maxima, the first occurring between 560 and 610 m.y. ago and the second between 510 and 540 m.y. ago. The earlier pulse, the more severe one, included the majority of the igAuthorsRobert J. Fleck, R. G. Coleman, H. R. Cornwall, W.R. Greenwood, D. G. Hadley, D. L. Schmidt, W. C. Prinz, James C. RatteSouthern Patagonia—Glacial events between 4 m.y. and 1 m.y. ago
No abstract available.AuthorsJohn H. Mercer, Robert J. Fleck, Edward A. Mankinen, Walter Sander
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government