Formation of Mn-skarn Ores at Thapsana Mines, Paros Island, Attico-Cycladic Metallogenetic Massif, Greece

Proceedings of The 1st International Electronic Conference on Mineral Science Pub Date : 2018-07-26 DOI:10.3390/IECMS2018-05461

S. Tombros, Michalis Fitros, Xenofon Simos, S. Kokkalas, K. Hatzipanagiotou

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引用次数: 2

Abstract

Mn-skarn ore deposits are relatively infrequent worldwide. A typical example of a Mn-skarn in the Attico-Cycladic Metallogenetic Massif is located at the mining area of Thapsana, Paros Island. The skarn occurs adjacent to the Thapsana, highly sericitized, biotite-garnet-tourmaline-lepidolite leucogranite apophyses of the Paros granitoid and related pegmatites and aplites The Mn-skarns orebodies occur as lenses and NE-trending veins hosted in the Cyclades Blueschist Unit (CBU) marbles and intercalated calcic schists. They comprise two discontinuous paragenetic zones (with widths of ≤ 10 m): A zone that contains vesuvianite, Mn-enriched salite to johannsenite-diopside and spessartine with cores enriched in grossular component (Sps ~75 Grs ~15 ), placed close to the Thapsana leucogranite, and a zone of grossular (Sps ~85 Grs ~5 ), actinolite to Mn-cummingtonite (with Mn ~ 0.6 apfu) and phlogopite more distal from the leucogranite. The Mn-skarns are crosscut by later WNW-to W-trending veins filled with Ca-K-Mg-bearing pyrolusite, manganite, rhodonite and rhodochrosite, carbonates, hydroxylapatite and johnbaumite. The Mn-ores

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希腊Attico-Cycladic成矿地块Paros岛Thapsana矿山锰夕卡岩矿石的形成

锰矽卡岩矿床在世界范围内相对少见。Paros岛Thapsana矿区是attico -基克拉底成矿地块中一个典型的锰夕卡岩。矽卡岩与Paros花岗岩体的Thapsana、高度绢云母化的黑云母-石榴石-碧石-亮云母浅花岗岩体及其相关伟晶岩和斜晶岩相邻。锰矽卡岩矿体呈透镜状和ne向脉状，赋有于基克拉迪斯蓝片岩单元(CBU)大理岩和插层钙片岩中。它们包括两个不连续的共生带(宽度≤10 m):靠近塔普萨纳浅花岗岩芯的含维苏岩、富锰盐岩芯到富锰透辉石岩芯和富镁辉石岩芯的共生带(Sps ~75 Grs ~15)，以及远离浅花岗岩芯的含镁辉石岩芯(Sps ~85 Grs ~5)、放光石岩芯到Mn-cummingtonite岩芯(Mn ~ 0.6 apfu)和云母辉石岩芯。mn矽卡岩是由后来的WNW-to - w走向的脉体横切而成，脉体中充满了含ca - k - mg的软锰矿、锰矿、菱铁矿和菱锰矿、碳酸盐、羟基磷灰石和钙铝矿。的Mn-ores

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Proceedings of The 1st International Electronic Conference on Mineral Science

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