covellite, digenite, atacamite and antlerite, jarosite were frequently reported in the literature [1-4]... The mineralogical study exposed goethite and jarosite as the main iron mineral phases. These minerals...Departament of Environmental Geochemistry. Niterói, RJ, Brazil (*correspondence: geo_ricardocesar@yahoo.com.br)...Mineral Technology (CETEM). Rio de Janeiro, RJ, Brazil The aquatic eco-region Xingu-Tapajós (Brazilian...the Tapajós river basin, especially closer to Itaituba Municipality, where the land-use is strongly marked
_ Bolivia ___________________________________ _ Brazil ____________________________________ _ Chile _...principal volcanoes ______________________ - _ __ Brazil showing location of thermal springs_________________________...intrusive rocks that includes much of southern Brazil. The arid uplands of Chubut and Santa Cruz Territories...from refs. 1061 and 1066. BRAZIL The principal mountain ranges in Brazil are in the eastern and southeastern...Bolivia rocks also underlie most of northeastern Brazil, where they are covered by continental Upper Carboniferous
