MINERALOGICAL ANALYSIS OF A WEATHERING MANTLE DERIVED FROM TUFFITE

Authors
FABRIS JD COEY JMD DEJESUS MF SANTANA DP GOULART AT FONTES MF CURI N
Citation
Jd. Fabris et al., MINERALOGICAL ANALYSIS OF A WEATHERING MANTLE DERIVED FROM TUFFITE, Hyperfine interactions, 91(1-4), 1994, pp. 751-757
Citations number
2
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Physics, Nuclear","Physics, Condensed Matter
Journal title
Hyperfine interactions → ACNP
ISSN journal
03043843
Volume
91
Issue
1-4
Year of publication
1994
Pages
751 - 757
Database
ISI
SICI code
0304-3843(1994)91:1-4<751:MAOAWM>2.0.ZU;2-2
Abstract
Mossbauer spectra are presented at 15 and 298 K for magnetically-separ ated extracts of magnetic soils from a tuffite-derived weathering mant le from Minas Gerais, Brazil. The principal iron-bearing mineral is ma ghemite in which the degree of Ti or Mg substitution is found to vary with depth. The Mg-maghemite, with lattice parameter a(0) = 0.838 nm, is a new natural mineral. It is associated with anatase in the magneti c-separates.