Sedimentary and diagenetic environments of Middle Ordovician iron-rich limestones (Pobroszyn Formation) in the northern Holy Cross Mountains, Poland

• Autorzy: Trela W.
• Języki publikacji: EN

Abstrakty

EN

The Middle Ordovician (Dapingian) of the northern Holy Cross Mountains (central Poland) is represented by condensed limestones that make up the Pobroszyn Formation. They reveal a complex stratification reflecting alternating depositional conditions. The basal limestones were deposited in open-marine conditions during the early Middle Ordovician sea level rise (navis Zone) correlated with the Baltoscandian Gärdlosa drowning. Periods of non-deposition associated with this transgression favoured precipitation of authigenic Fe minerals close to the sediment-water interface. The upper part of this succession appears to representa succeeding depositional phase associated with a second transgressive event, which probably involved reworking of the underlying lithified substrate. High energy events were interrupted by periods of non-deposition favouring development of benthic microbial communities contributing to Fe authigenesis. The Pobroszyn Formation reveals features suggesting an early diagenetic alteration of the parent carbonate sediment in a shallow ma rine setting (e.g., beach shoreface) or even was influenced by meteoric diagenesis, which probably took place during a sea level fall preceding the second transgressive event.

Słowa kluczowe

EN

Ordovician; limestones; ironstones; reworking; diagenesis

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2008
• Tom: Vol. 52, No 3
• Strony: 199--199
• Opis fizyczny: –212, bibliogr. 45 po0z., rys., wykr.

Twórcy

autor

Trela W.

• Polish Geological Institute, Holy Cross Mts. Branch, Zgoda 21, PL-25-953 Kielce, Poland,

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