Thaumasite in calcic skarns from the Zvezdel-Pcheloyad Pb-Zn deposit, Eastern Rhodopes, Bulgaria

IF 0.2 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society Pub Date : 2022-12-01 DOI:10.52215/rev.bgs.2022.83.3.51

Y. Tzvetanova, I. Piroeva

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Abstract

Thaumasite was found in zoned calcic skarns hosted by the monzonitic rocks of the Zvezdel pluton, Eastern Rhodopes. Associated minerals are wollastonite, clinopyroxene, grossular-andradite garnets, Ti-rich garnets, plagioclase, calcite, quartz, epidote, prehnite, and chlorite. Titanite, apatite and magnetite are present as accessories. The mineral has been characterized using optical microscopy, PXRD, SEM/EDS, EPMA, and FTIR. Thaumasite forms sheaf-like and fan-shaped aggregates, which consist of acicular crystals elongated along the c axis. The IR spectrum of thaumasite is in accordance with the chemical composition and contains absorption bands in the range 3500–3291 cm–1 (O–H stretching vibrations); 1683, 1650 cm–1 (bending vibrations of H2O); 1389 cm–1 (stretching vibrations of CO32–); 1100, 1069 cm–1 (asymmetric stretching vibrations of SO42–); 882 cm–1 (symmetric bending vibration of CO32–); 768, 742, 680 cm–1 (Si–O stretching vibrations of Si(OH)6 octahedra); 670 cm–1 (bending vibrations of SO42–).

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保加利亚东罗多彼Zvezdel-Pcheloyad铅锌矿床钙质矽卡岩中的陶马石

Thaumasite是在由Zvezdel深成岩体的二长岩（Eastern Rhodopes）托管的分区钙矽卡岩中发现的。伴生矿物有硅灰石、单斜辉石、毛状钙长石石榴石、富钛石榴石、斜长石、方解石、石英、绿帘石、预热器和绿泥石。钛铁矿、磷灰石和磁铁矿作为附件存在。使用光学显微镜、PXRD、SEM/EDS、EPMA和FTIR对该矿物进行了表征。Thaumasite形成鞘状和扇形聚集体，由沿c轴伸长的针状晶体组成。thaumasite的红外光谱与化学成分一致，包含3500–3291 cm–1范围内的吸收带（O–H拉伸振动）；16831650 cm–1（H2O的弯曲振动）；1389 cm–1（CO32-的拉伸振动）；11001069 cm–1（SO42-的不对称拉伸振动）；882 cm–1（CO32-的对称弯曲振动）；768、742、680 cm–1（Si（OH）6八面体的Si–O拉伸振动）；670 cm–1（SO42-的弯曲振动）。

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Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society GEOSCIENCES, MULTIDISCIPLINARY-

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