Chemical composition and cell parameters were ascertained on new data from Ti-Nb-Ta complex oxides from the miarolitic pegmatites of the Baveno pink granite (Southern Alps, NW Italy). The crystals are tiny, single or aggregated in smal sprays, prismatic or tabular, from yellow-orange to brownish in colour. Typical associates minerals include fluorite, zinnwaldite, gadolinite-group minerals and Sc-minerals. Cavity paragenesis in typical of NYF pegmatites, and shows two stages of crystallization developing in magmatic-pneumatolitic and hydrothermal conditions. X-ray data show that som oxides belong to the aeschynite mineral group; others are polycrase and fersmite. Aeschnyte and polycrase are chemically heterogeneous and structurally disordered because of their metamict state. This disorder does not always seem to be related to radionuclide contents. Two main trends are indicates, considering the behaviour of Y. The high Y contents fit with very low Ca an LREE contents in the A site; the HREE contents follow the t TREND. In the B site, Ti is the dominant cation, followed by some Nb and very little Ta. Small quantities of Y fit with increasing Ca, U, Th and REE contents. In the B site, Nb cations often exceed those of Ti. Th contents are often greater than those of T. Besides the already known aeschnyte-(Y) and vigezzite, new varieties, 'titano-vigizzite' and 'niobo-aeschnyte-(Y)', are identified here in he Baveno miarolitic cavities. Samples 14 (analysis a) and 2502 (analysis b) have Ca as the main occupant of the A site, followed by Y, Th and REE; in the B site, Ti prevails over Nb. These compositions cannot be considered as pure vigezzite, but as a new variery called 'titano-vigezzite'. In the same way, analysis a of sample 3 may be considered a new variety of aeschnyte-(Y), with Nb prevailing over Ti in the B site, and here called 'niobo-aeschynite on polycrase (sample 3194) allows some inferences on the crystallization sequence.
Nb-Ta oxide minerals from miarolitic pegmatites of the Baveno pink granite, NW Italy
Aurisicchio C;
2001
Abstract
Chemical composition and cell parameters were ascertained on new data from Ti-Nb-Ta complex oxides from the miarolitic pegmatites of the Baveno pink granite (Southern Alps, NW Italy). The crystals are tiny, single or aggregated in smal sprays, prismatic or tabular, from yellow-orange to brownish in colour. Typical associates minerals include fluorite, zinnwaldite, gadolinite-group minerals and Sc-minerals. Cavity paragenesis in typical of NYF pegmatites, and shows two stages of crystallization developing in magmatic-pneumatolitic and hydrothermal conditions. X-ray data show that som oxides belong to the aeschynite mineral group; others are polycrase and fersmite. Aeschnyte and polycrase are chemically heterogeneous and structurally disordered because of their metamict state. This disorder does not always seem to be related to radionuclide contents. Two main trends are indicates, considering the behaviour of Y. The high Y contents fit with very low Ca an LREE contents in the A site; the HREE contents follow the t TREND. In the B site, Ti is the dominant cation, followed by some Nb and very little Ta. Small quantities of Y fit with increasing Ca, U, Th and REE contents. In the B site, Nb cations often exceed those of Ti. Th contents are often greater than those of T. Besides the already known aeschnyte-(Y) and vigezzite, new varieties, 'titano-vigizzite' and 'niobo-aeschnyte-(Y)', are identified here in he Baveno miarolitic cavities. Samples 14 (analysis a) and 2502 (analysis b) have Ca as the main occupant of the A site, followed by Y, Th and REE; in the B site, Ti prevails over Nb. These compositions cannot be considered as pure vigezzite, but as a new variery called 'titano-vigezzite'. In the same way, analysis a of sample 3 may be considered a new variety of aeschnyte-(Y), with Nb prevailing over Ti in the B site, and here called 'niobo-aeschynite on polycrase (sample 3194) allows some inferences on the crystallization sequence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
