Accession Number : AD0640498

Title :   STUDIES OF EXTRATERRESTRIAL PARTICLES IN SEDIMENTARY ROCKS.

Descriptive Note : Final rept. May 63-Sep 66,

Corporate Author : BROWN UNIV PROVIDENCE R I DEPT OF GEOLOGICAL SCIENCES

Personal Author(s) : Mutch,Thomas A.

Report Date : SEP 1966

Pagination or Media Count : 83

Abstract : A number of sedimentary rocks, chiefly rock salts, have been processed for the recovery of possible extraterrestrial particles. The only recognizable particles in this category are opague magnetic spherules composed chiefly of magnetite. The mode of occurrence of the spherules suggests an extraterrestrial origin, though neither the chemistry or minerology of individual particles is uniquely meteoritic. Influx rates calculated for spherules contained in Silurian and Permian salts are closely similar to those calculated by Crozier (Nine years of Continuous Collection of Black Magnetic Spherules from the Atmosphere: J. Geo phys. Res. 71, 603-611) for the recent geologic age. This suggests a general constancy of meteoritic activity throughout this period of geologic time. (Author)

Descriptors :   (*SEDIMENTARY ROCK, METEORITES), (*METEORITES, CHEMICAL ANALYSIS), ROCK SALT, MAGNETITE, GEOLOGIC AGE DETERMINATION, STRATIGRAPHY, SEDIMENTATION, MATERIAL SEPARATION

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE