Abstract:
X-ray Fluorescence Spectrometry (XRF) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) were used to obtain the geochemical data of podumene pegmatite, albite pegmatite and potash feldspar pegmatite in the Chuan-ziyuan area. Podumene pegmatite contains high Al
2O
3 (16.23%-16.4%) and K
2O (3.05%-5.22%) with high differentiation index (91.13-94.9). Podumene pegmatite is enriched in Rb and K but depleted in Ba, Sr and Ti with ΣREEs of 2.9×10
-6-3.5×10
-6. Albite pegmatite is characterized by high Na
2O (5.58%-7.41%) and low K
2O (0.98%-2.62%). Compared to podumene pegmatite, the Rb/Sr ratios of albite pegmatite decreased and REEs increased. Potash feldspar pegmatite contains high K
2O (9.13%) and low Na
2O (1.69%), the Zr/Hf and K/Rb ratios increased compared to podumene pegmatite and albite pegmatite. The geochemical characteristics of these rocks indicate that liquid immiscibility, albitization metasomatism and potash feldspathization metasomatism resulted in Li and Rb mineralization in podumene pegmatite, Nb, Ta and Be mineralization in albite pegmatite and potash feldspar pegmatite, respectively. These observations are geochemical indicators for exploration of the rare metal deposits.
Abstract: X-ray Fluorescence Spectrometry (XRF) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) were used to obtain the geochemical data of podumene pegmatite, albite pegmatite and potash feldspar pegmatite in the Chuan-ziyuan area. Podumene pegmatite contains high Al2O3 (16.23%-16.4%) and K2O (3.05%-5.22%) with high differentiation index (91.13-94.9). Podumene pegmatite is enriched in Rb and K but depleted in Ba, Sr and Ti with ΣREEs of 2.9×10-6-3.5×10-6. Albite pegmatite is characterized by high Na2O (5.58%-7.41%) and low K2O (0.98%-2.62%). Compared to podumene pegmatite, the Rb/Sr ratios of albite pegmatite decreased and REEs increased. Potash feldspar pegmatite contains high K2O (9.13%) and low Na2O (1.69%), the Zr/Hf and K/Rb ratios increased compared to podumene pegmatite and albite pegmatite. The geochemical characteristics of these rocks indicate that liquid immiscibility, albitization metasomatism and potash feldspathization metasomatism resulted in Li and Rb mineralization in podumene pegmatite, Nb, Ta and Be mineralization in albite pegmatite and potash feldspar pegmatite, respectively. These observations are geochemical indicators for exploration of the rare metal deposits.
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