Petrological and Geochemical Comparison of Rodingites from Kimi -Evia island with outcrops from adjacent regions

Bulletin of the Geological Society of Greece Pub Date : 2019-11-08 DOI:10.12681/bgsg.19603

C. Karkalis, A. Magganas, P. Koutsovitis

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Abstract

The present study is focused on the geochemical and petrological comparison between rodingites from the Kimi region in Central Evia (Greece) with those from East and West Othris, as well as with rodingites from Skyros island. Based upon their whole rock geochemical and petrographical data it is suggested that rocks from Skyros island and Kimi-Evia display similar features. Kimi-Evia and Skyros rodingites are characterized by their highly comparable REE patterns with significant LREE enrichments. This is most likely attributed to the effects of carbonic rich fluids, enhancing the transfer of REE via CO3-2 ligands. The West Othris rodingites display similar MREE and HREE patterns with the least fractionated rodingites from Kimi-Evia and Skyros, whereas the LREE are significantly depleted. The East Othris rodingites differ from all other rodingite occurrences, since they exhibit much lower ΣREE contents. Rodingitization in all studied areas was associated with serpentinization processes and was evolved in several metasomatic stages, in which vesuvianite was formed during the last episodes at relatively low temperatures.

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基米-埃维亚岛罗丁岩与邻近地区露头岩的岩石学地球化学比较

本研究的重点是希腊中部埃维亚基米地区与东、西奥特里斯地区以及斯基罗斯岛的岩石地球化学和岩石学比较。根据全岩地球化学和岩石学资料，认为Skyros岛和Kimi-Evia岛的岩石具有相似的特征。Kimi-Evia和Skyros的稀土元素模式具有高度可比性，且轻稀土元素富集显著。这很可能是由于富碳流体的作用，增强了稀土元素通过co -2配体的转移。West Othris岩石与Kimi-Evia和Skyros岩石表现出相似的MREE和HREE模式，而LREE明显减少。东奥斯里斯岩与所有其他岩位不同，因为它们的ΣREE含量要低得多。所有研究地区的岩化作用都与蛇纹岩作用有关，并经历了几个交代阶段，其中维苏岩形成于最后几期，形成温度相对较低。

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Bulletin of the Geological Society of Greece

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