 | Dill, H. G., Bosse, H.-R., Henning, K.-H., Fricke, A., Ahrendt, H. (1997) Mineralogical and chemical variations in hypogene and supergene kaolin deposits in a mobile fold belt the Central Andes of northwestern Peru. Mineralium Deposita, 32 (2) 149-163 doi:10.1007/s001260050081 | Journal (article/letter/editorial) | | northwestern Peru Received: 11 August 1995 / Accepted: 8 May 1996 Abstract In western Peru kaolin-alunite... S, Zr vs. Ti, Cr + Nb vs. Ti + Fe, and Ce + Y + La vs. Ba + Sr). S, Ba, and Sr are considerably enriched...1984; Mitchell 1992). The clay deposits in western Peru permit discrimination of hypogene and supergene...publications about ore deposits in the Andes, especially in Peru (Petersen 1970; Cardozo and Cedillo, 1990), research...Reyes Riviera 1980; Wilson 1984). In the ‘‘región de la costa’’, it is the ‘‘Grupo Calipuy’’, which rests |  | | Journal (article/letter/editorial) | | fluorite and topaz deposits. . . . . . . . . . . . . . 30.4. Sedimentary fluorite and topaz deposits . ...ZrO2 (Ba,Sr)(Nb,Ti)2(O,OH)7 BaSO4 2Ca(SO4)·H2O (Ce,La)(CO3)F Be3(Sc,Al)2 Si2O18 Ca(UO2)6O4(OH)6·8(H2O)...BaAl2Si2O8 (Ce,Th)O2 (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 PbCO3 (Ca0.5Na...5Si3AlO12(OH)6 K5Ca8Si18O46(OH)·3(H2O) Ir3Fe (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 CaMnBe2Si5O13(OH)2·2H2O...Gallite Gallobeudantite Garnet (Ce, La)Al3(PO4)2(OH)6, (Ce,La)F3 CaF2 Mg2SiO4 Pb(UO2)4O3(OH)4·4(H2O) | | | Journal (article/letter/editorial) | | fluorite and topaz deposits. . . . . . . . . . . . . . 30.4. Sedimentary fluorite and topaz deposits . ...ZrO2 (Ba,Sr)(Nb,Ti)2(O,OH)7 BaSO4 2Ca(SO4)·H2O (Ce,La)(CO3)F Be3(Sc,Al)2 Si2O18 Ca(UO2)6O4(OH)6·8(H2O)...BaAl2Si2O8 (Ce,Th)O2 (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 PbCO3 (Ca0.5Na...5Si3AlO12(OH)6 K5Ca8Si18O46(OH)·3(H2O) Ir3Fe (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 CaMnBe2Si5O13(OH)2·2H2O...Gallite Gallobeudantite Garnet (Ce, La)Al3(PO4)2(OH)6, (Ce,La)F3 CaF2 Mg2SiO4 Pb(UO2)4O3(OH)4·4(H2O) |
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