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1 Bulletin of the Polish Academy of Sciences. Earth Sciences

1 2000

1 Krajewski K.

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

100%

Krajewski K.

2000

tom 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.