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Chemical Evolution of Nb-Ta Oxides and Cassiterite in Phosphorus-Rich Albite-Spodumene Pegmatites in the Kangxiwa–Dahongliutan Pegmatite Field, Western Kunlun Orogen, China

by Yonggang Feng 1,2,*, Ting Liang 1,2,*, Xiuqing Yang 1,2, Ze Zhang 1,2 and Yiqian Wang 1,2
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
2
Laboratory of Mineralization and Dynamics, Chang’an University, Xi’an 710054, China
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(3), 166; https://doi.org/10.3390/min9030166
Received: 30 January 2019 / Revised: 18 February 2019 / Accepted: 2 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Toward Mineral Systems for HFSE Rare Metals)
The Kangxiwa–Dahongliutan pegmatite field in the Western Kunlun Orogen, China contains numerous granitic pegmatites around a large granitic pluton (the Dahongliutan Granite with an age of ca. 220 to 217 Ma), mainly including barren garnet-, tourmaline-bearing pegmatites, Be-rich beryl-muscovite pegmatites, and Li-, P-rich albite-spodumene pegmatites. The textures, major element contents, and trace element concentrations of columbite-group minerals (CGM) and cassiterite from three albite-spodumene pegmatites in the region were investigated using a combination of optical microscopy, SEM, EPMA and LA-ICP-MS. The CGM can be broadly classified into four types: (1) inclusions in cassiterite; (2) euhedral to subhedral crystals (commonly exhibiting oscillatory and/or sector zoning and coexisting with magmatic cassiterite); (3) anhedral aggregates; (4) tantalite-(Fe)-ferrowodginite (FeSnTa2O8) intergrowths. The compositional variations of CGM and cassiterite are investigated on the mineral scale, in individual pegmatites and within the pegmatite group. The evolution of the pegmatites is also discussed. The variation of Nb/Ta and Zr/Hf ratios of the cassiterite mimics the Nb-Ta and Zr-Hf fractionation trends in many LCT pegmatites, indicating that these two ratios of cassiterite may bear meanings regarding the pegmatite evolution. View Full-Text
Keywords: albite-spodumene pegmatites; columbite-group minerals; cassiterite; Dahongliutan; chemical evolution of Nb-Ta oxides albite-spodumene pegmatites; columbite-group minerals; cassiterite; Dahongliutan; chemical evolution of Nb-Ta oxides
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Feng, Y.; Liang, T.; Yang, X.; Zhang, Z.; Wang, Y. Chemical Evolution of Nb-Ta Oxides and Cassiterite in Phosphorus-Rich Albite-Spodumene Pegmatites in the Kangxiwa–Dahongliutan Pegmatite Field, Western Kunlun Orogen, China. Minerals 2019, 9, 166.

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