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2 Bulletin of the Polish Academy of Sciences. Earth Sciences

2 Krajewski K.

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Diagenetic Recrystallization of Apatite in Phosphate Nodules of the Brentskardhaugen Bed (Jurassic) in Spitsbergen

Krajewski K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2001

Vol. 49, nr 1

71-87

Phosphate nodules in the condensed Brentskardhaugen Bed (Toarcian-Bathonian) of Spitsbergen show microstructures suggesting stages of diagenetic and burial recrystallization of sedimentary apatite. Remnants of the primary globular apatitic fabric witness rapid development of mineral phosphate phase in nearsurface environment of the condensed sediment facies. This primary fabric was a subject of diagenetic recrystallization to provide two distinct secondary fabrics composed of: (i) radial-fibrous apatite, and (ii) blocky apatite. The development of these fabrics was a result of shallow and deep burial processes, respectively.

Early diagenetic collapse and injection microstructures in phosphate nodules of the Brentskardhaugen Bed (Jurassic) in Spitsbergen

Krajewski K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2000

Vol. 48, nr 2

209-229

Fossiliferous phosphate nodules in the condensed Brentskardhaugen Bed (Toarcian-Bathonian) in Spitsbergen show common collapse and injection microstructures associated with stages of phosphatization of biogenic carbonate skeletal remains. These structures provide supporting evidence for the nature of early phosphate replacement of biogenic carbonate in clastic condensed environment of the Jurassic Spitsbergen shelf. The replacement process consisted in phosphate cementation of the original skeletal surfaces and internal skeleton pore spaces. Stages of early diagenetic dissolution of biogenic carbonate and reworking events in the depositional environment led, however, to complex and variable infillings of skeletal moulds. Interplay of recurrent events of phosphate emplacement into sediment, carbonate dissolution, and mechanical reworking of fossiliferous phosphate nodules accounts for a broad spectrum of phosphatic replacement microstructures in the original biogenic carbonate.