Mineralogical and geochemical evidence for two-stage silicification of serpentinized peridotites from the Szklary Massif (NE Bohemian Massif)

• Autorzy: Cieślik Błażej , Kierczak Jakub , Pietranik Anna

Identyfikatory

DOI

10.2478/mipo-2022-0003

• Języki publikacji: EN

Abstrakty

EN

Previously unknown exposures of silicified serpentinites have been documented within the Szklary Massif, which is a fragment of the tectonically dismembered Central Sudetic Ophiolite (NE Bohemian Massif). On the basis of textural, mineralogical and chemical differences, two types of silicified serpentinites have been distinguished in this study (Type I and Type II). Type I is characterized by well-preserved primary minerals cut by numerous veinlets filled with microscale euhedral quartz crystals. Studied samples of Type I are enriched in silica (from 62 to 69 wt.% SiO2) and depleted in magnesium (from 10 to 19 wt.% MgO) in comparison to serpentinized peridotites from the Szklary Massif. Type II is almost exclusively composed of amorphous or poorly crystalline silica, with microquartz aggregates being the most abundant form. Silicified serpentinites of Type II show extremely high values of silica (from 83 to 90 wt.% SiO2) and low magnesium concentrations (from 4 to 8 wt.% MgO). Both types of silicified serpentinites have elevated content of REE and many other trace elements generally regarded as incompatible. We infer that the earlier silicification event was caused by the percolation of Si-rich hydrothermal fluids derived from igneous rocks, which intruded this area from ca. 380 to 330 Ma. A subsequent silicification event is the result of silica remobilization during intense chemical weathering under tropical conditions, which could have occurred between Late Cretaceous and Miocene.

Słowa kluczowe

EN

silicified serpentinites; silicification; serpentinized peridotites; cathodoluminescence imaging; Szklary massif

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2022
• Tom: Vol. 53, iss. 1
• Strony: 20--35
• Opis fizyczny: Bibliogr. 54 poz., rys., tab., wykr.

Twórcy

autor

Cieślik Błażej

• University of Wrocław, Institute of Geological Sciences, pl. Maksa Borna 9, 50-204 Wrocław, Poland

autor

Kierczak Jakub

• University of Wrocław, Institute of Geological Sciences, pl. Maksa Borna 9, 50-204 Wrocław, Poland

autor

Pietranik Anna

• University of Wrocław, Institute of Geological Sciences, pl. Maksa Borna 9, 50-204 Wrocław, Poland

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