Pyritization of microfossils: crinoid remains from the Middle Jurassic of Ogrodzieniec (Kraków-Częstochowa Upland, Poland)

• Autorzy: Szczepanik P. , Sawłowicz Z.
• Konferencja: 5th Micropalaeontological Workshop MIKRO-2005 (8-10.06.2005, Szymbark, Poland)
• Języki publikacji: EN

Abstrakty

EN

Pyritized crinoid skeletal elements have been found in the so-called "ore-bearing clays" of the Middle Jurassic exposed in Ogrodzieniec (Kraków-Częstochowa Upland, Poland). Their assem- blage consists of columnals, cirrals and brachials; calyx plates have not been found. Ossicles occur both as unpyritized and pyritized. Three main types of pyritization have been distinguished in investigated material: (a) original calcitic skeleton is not replaced by pyrite but its void spaces are infilled with pyrite; (b) calcitic skeleton is replaced by pyrite, with or without void infilling; (c) pyritization overwhelms the primary morphology of the ossicle. The first two types predominate in the studied material. The types of pyritization have been explained by several subsequent stages of this process. The main stage of crinoid pyritization happened probably in the sediment during early diagenesis and was limited to microenvironments of fossils. Different morphological forms of pyrite registered in the same ossicles (euhedra, framboids and massive pyrite, can be explained by different position and time of the fossil pyritization, the type and location of organic matter, porosity, several stages of pyritization, "openness" of skeleton, different assemblages of bacteria, and probably many other factors.

Słowa kluczowe

EN

pyrite; pyritization; crinoids; ore-bearing clays; Middle Jurassic; Bathonian; Poland

• Wydawca: Instytut Nauk Geologicznych PAN
• Czasopismo: Studia Geologica Polonica
• Rocznik: 2005
• Tom: Vol. 124
• Strony: 37--52
• Opis fizyczny: Bibliogr. 48 poz., rys.

Twórcy

autor

Szczepanik P.

• Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków

autor

Sawłowicz Z.

• Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków

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