Timing of pegmatite emplacement and skarn formation in the Malyovitsa Unit, NW Rila: evidence from zonal grossular crystals

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.2022.83.3.121

R. Vassileva, Svetoslav Petrussenko, V. Grozdev, I. Peytcheva, Yu. V. Plotkina, A. von Quadt

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Abstract

Contact Ca-skarns are formed in the marbles of the Malyovitsa Lithotectonic Unit as a result of emplacement of crosscutting pegmatite injections in the area of the Dzhendemski Ezera, NW Rila Mt. Large (up to 4 cm), well-shaped garnet crystals dominate the mineral association with additional vesuvianite, diopside, scapolite and zoisite. Garnets were selected for mineralogical, geochemical and U-Pb geochronological study. Their crystals show clear zonal pattern due to variation in the octahedral position (Fe3+/Al3+), although the overall composition defines grossular predominance (72–95 mol.% grossular; 4–24% andradite). Trace-element signatures reveal constant isomorphic incorporation of P, V, Zn, Ga, Ge and Y, REE, HFSE, U. Results from the in-situ U-Pb dating of the studied skarn materials suggest the timing of pegmatite intrusion onto the metamorphic rocks and marble-hosted skarn formation at 58.37±0.70 Ma.

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西北里维拉Malyovitsa单元伟晶岩侵位和矽卡岩形成的时间:来自带状大晶体的证据

接触钙矽卡岩形成于Malyovitsa岩石构造单元的大理岩中，这是NW Rila山Dzhendemski Ezera地区横切伟晶岩注入的结果。大(高达4厘米)，形状良好的石榴石晶体占主导地位，与额外的维苏岩，透辉石，角长石和黝帘石相结合。选择石榴石进行矿物学、地球化学和U-Pb年代学研究。由于八面体位置的变化(Fe3+/Al3+)，它们的晶体显示出明显的带状模式，尽管总体组成确定了星形优势(72-95 mol.%星形;4 - 24%钙铁榴石)。微量元素特征显示P、V、Zn、Ga、Ge、Y、REE、HFSE、u等元素的持续同构结合。对所研究的矽卡岩材料进行原位U-Pb定年，结果表明辉晶岩侵入变质岩和大理岩为主的矽卡岩形成的时间为58.37±0.70 Ma。

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

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