Microtexture investigation of amblygonite-montebrasite series with lacroixite: Characteristics and formation process in pegmatites

Yohei Shirose, Seiichiro Uehara

研究成果: Contribution to journalArticle査読

抄録

Amblygonite-montebrasite series and lacroixite from Nagatare Li-Cs-Ta (LCT) pegmatite, Fukuoka Prefecture, Japan, were investigated by powder X-ray diffraction (XRD), electron microprobe analyses, and transmission electron microscope (TEM)/scanning transmission electron microscope (STEM) analyses. Scattered patchy or lamellar lacroixite was contained in montebrasite and amblygonite in all observed specimens. TEM/STEM observations revealed that the patchy and lamellar texture comprised lacroixite and low-fluorine montebrasite having same crystal orientations as that of host montebrasite and the boundaries corresponded to well-developed {110} planes. The observed microtexture was newly discovered, and it is an important evidence of the exsolution process. In XRD experiments conducted at high temperature, the unit-cell parameters of amblygonite were closer to that of monoclinic structures such as lacroixite with increasing temperature. Results suggested that scattered patches or lamellae of lacroixite were exsolution textures from a high-temperature phase. Montebrasite and amblygonite specimens from other localities involved varying textures corresponding to their occurrence. The amblygonite-montebrasite series from petalite-bearing pegmatite included low to high lacroixite contents and that from lower-temperature pegmatite with spodumene either did not possess or involved low lacroixite contents. Gem-quality montebrasite from drusy vugs formed at low temperature did not include any exsolution texture or lacroixite. The variety of texture of the amblygonite-montebrasite series indicated in this study generated new possibilities as the indicator of pegmatite-forming process.

本文言語英語
ページ(範囲)75-84
ページ数10
ジャーナルAmerican Mineralogist
103
1
DOI
出版ステータス出版済み - 1 26 2018

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球化学および岩石学

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