Accession Number : AD0655794

Title :   SPHERULES IN SEDIMENTARY ROCKS.

Descriptive Note : Final rept. 1 May 66-30 Apr 67,

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

Personal Author(s) : Mutch,Thomas A.

Report Date : MAY 1967

Pagination or Media Count : 44

Abstract : Rock salts and cherts have been processed for recovery of magnetic spherules. An assumption of constant spherule influx throughout geologic time is compatible with actual spherule abundances both in rapidly deposited salts of Silurian, Permian and Triassic age and slowly deposited cherts of Jurassic age. Repeated small-area chemical analyses of spherule polished surfaces with an electron microprobe reveal no obvious segregation of phases. Two groups of spherules can clearly be distinguished. The first is made up chiefly of Fe with small amounts of Mn and Cr. The second group contains variable amounts of Fe, Si, K, Al, Ca, and Ti. (Author)

Descriptors :   (*SEDIMENTARY ROCK, CHEMICAL ANALYSIS), (*PETROLOGY, *STRATIGRAPHY), SALTS, DEPOSITS, ROCK, DISTRIBUTION, LIMESTONE, SEDIMENTATION, MAGNETIC FIELDS

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE