SPHERULES IN SEDIMENTARY ROCKS.
Final rept. 1 May 66-30 Apr 67,
BROWN UNIV PROVIDENCE R I DEPT OF GEOLOGICAL SCIENCES
Pagination or Media Count:
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
- Geology, Geochemistry and Mineralogy