Skip to content. | Skip to navigation

Personal tools

 

 

 

 
     

 

 

 

 

 

 

 

 

 

 

 

 

You are here: Home / PDFs on demand / Bibliographical References of PDFs on demand / Weathering alteration and related REE concentration in the Catalao I carbonatite complex, central Brazil

S. De Oliveira and R. Imbernon (1998)

Weathering alteration and related REE concentration in the Catalao I carbonatite complex, central Brazil

Journal of South American Earth Sciences, 11(4):379-388.

REE geochemistry and mineralogy was investigated in a lateritic profile derived from the weathering alteration of the Catalao I complex. From bottom to top of the weathering profile the fresh rock (FR) changes gradually into an altered rock, an isalteritic saprolite (IS) and an alloteritic saprolite (AS). The FR is a phoscorite cut by abundant carbonatitic veins. In the IS apatite is the most abundant mineral, occurring together with goethite, quartz, and small amounts of a secondary Al-phosphate belonging to the plumbogummite-group minerals. AS is formed of goethite, plumbogummite-group minerals, and quartz. Within the FR, carbonatitic veins are richer in REE (REE2O3=0.32\%) than phoscorite (REE2O3=0.13\%). Both parent rocks are characterized by LREE enrichment, but LREE/HREE ratio is higher for carbonatite. REE concentration tends to intensify with weathering, being REE2O3= 0.6-0.8\% for IS and 1.3-1.9\% for AS. REE fractionation in the vertical direction is very weak, being the general pattern of REE distribution essentially inherited from the fresh rock. In addition to the REE-laterites, an extremely REE rich silicified facies within the IS (REE2O3 = 2.48-4.83\%) was also investigated. (C) 1998 Elsevier Science Ltd. All rights reserved.

profile, mobility, bauxite, rocks, soils, geochemistry, fractionation, rare-earth elements, trace-elements, redistribution
WOS:000078135400005
Year

1875 1876 1877 1878 1879
1880 1881 1882 1883 1884
1885 1886 1887 1888 1889
1890 1891 1892 1893 1894
1895 1896 1897 1898 1899

1900 1901 1902 1903 1904
1905 1906 1907 1908 1909
1910 1911 1912 1913 1914
1915 1916 1917 1918 1919
1920 1921 1922 1923 1924

1925 1926 1927 1928 1929
1930 1931 1932 1933 1934
1935 1936 1937 1938 1939
1940 1941 1942 1943 1944
1945 1946 1947 1948 1949

1950 1951 1952 1953 1954
1955 1956 1957 1958 1959
1960 1961 1962 1963 1964
1965 1966 1967 1968 1969
1970 1971 1972 1973 1974

1975 1976 1977 1978 1979
1980 1981 1982 1983 1984
1985 1986 1987 1988 1989
1990 1991 1992 1993 1994
1995 1996 1997 1998 1999

2000 2001 2002 2003 2004
2005 2006 2007 2008 2009
2010 2011 2012 2013 2014
2015 2016 2017 2018 2019
2020 2021 2022 2023 2024

 
e-ressources

 

PDFs on demand
 

 

 

RBINS private PDFs