The Li-bearing pegmatites of the Pampean Pegmatite Province (PPP) occur in a rare-element pegmatite belt developed mainly Lower Paleozoic age on southwestern margin Gondwana. show Li, Rb, Nb ≤ Ta, Be, P, B, Bi enrichment, and belong to Li-Cs-Ta (LCT) petrogenetic family, Rare-Element-Li (REL-Li) subclass; most them are complex type spodumene subtype, some albite-spodumene type, few petalite sub...

Abstract The GREENPEG project, which is funded by the European Commission Horizon 2020 ‘Climate action, environment, resource efficiency and raw materials’ programme, aims to develop multimethod exploration toolsets for identification of European, buried, small-scale (0.01–5 million m 3 ) pegmatite ore deposits Nb–Y–F (NYF) Li–Cs–Ta (LCT) chemical types. project being coordinated Natural Histor...

Chemical weathering indices are commonly used for characterizing weathering profiles by incorporating bulk major element oxide chemishy inlo a single metric for each sample. Generally, on homogeneous parent rocks, weathering indices change systematically with depth. However, the weathering of heterogeneous metamorphic rocks confounds the relationship between weathering index and depth. In this ...

fro11 1 pegmatite in Cardiff township, Haliburton County, Ontario. Found as dark reddish brown to brownish black anhedral masses. Hardneis B$, specific gravity 8,08. Metamict; isotropic with n near 1.630. when the mineral is heated at 925" i the n increases to about 1.640 and the specific gravity to 8.20. At high temperatures the mineral decomposes before it recrystallizes and r-ray difiraction...

Ten road cut samples collected from five lithological sections of Lokoja sandstone formation in the Middle Niger basin were investigated using integrated granulometric, petrographic and geochemical analyses. Results of grain size analysis; standard deviation and skewness which ranges from 0.08 to -0.05 and 0.59 to -0.07 respectively suggest very well sorted to moderately well sorted sediments. ...

Clay-rich sediments from the Kajjansi, Kitiko, Kitetika, and Ntawo valleys in central Uganda were analyzed for mineralogical and chemical composition, including the rare earth element (REE) contents. The valleys are filled with Quaternary to Recent alluvial and lacustrine sands, silt, and gravels, which formed from the bed rock metasediments of the Buganda-Toro System and from granitoid rocks t...

The Lalezar granitoids crop out within volcanic successions of the Urumieh-Dokhtar Magmatic Assemblage (UDMA). These granitoids have a range from gabbro-diorites to granites in composition. The mineral compositions of the most felsic rocks are characterized by the abundances of Na-plagioclase, quartz, alkali feldspar, biotite and hornblende. In the gabbro-diorite rocks, plagioclase (Ca-rich), h...