Phanerozoic Phosphorite Depositional Systems: A Dynamic by Jörg Trappe

By Jörg Trappe

The e-book provides a brand new and finished version for the advance of phosphate sediments. beginning with geochemistry and together with new equipment in sedimentology (sequence stratigraphy), it leads to an interdisciplinary method of a source approach protecting all fields of phosphate geology. For researchers, academics and scholars alike the publication bargains a whole assessment of the entire box together with case reports of significant deposits.

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1991). Particularly, erosional features, mostly hardground suites, attracted special attention of many researchers (JARVIS 1980a,b, 1992, SOUTHGATE 1986a,b, FOLLMI 1990, CARSON & CROWLEY 1993). These fabrics play a specific role for sequence stratigraphic analyses (SOUTHGATE & SHERGOLD 1991, GLENN et al. 1994, MALLINSON et al. 1994). Intervals of clastic sedimentation starvation, which are also recorded by discontinuity surfaces and corrosional fabrics, represent times of undiluted high organic deposition and can initiate phosphogenic processes.

1990). These investigations indicate that the organic matter is of a marine source and reflects intensive microbial degradation and oxidation. The latter explains the negative correlation of Corg and phosphate mineral contents. The more stable humic compounds support the results from the organic matter composition (NATHAN 1990). Biomarkers reveal mostly an algal source of the organic matter (BEIN & AMIT 1982, SANDSTROM 1986). The organic geochemistry of phosphate particles is still in its infancy and further investigations may help to develop a useful tool to determine various types of organic phosphorus sources, and to follow the degradation and oxidation processes during phosphogenesis.

U +20 +40 +60 I I J I I I I I i l 20 534S I SO4 I (% CDT) (raM) 30 Fig. 3. The relationship of t~34S and ~13C profiles to the SO42- and CO32- contents of a idealized modern soft sediment column. The schematic diagram assumes constant pH conditions and linear increasing inorganic carbon with depth (from JARVIS et al. 1994 based on MeARTHUR et al. 1986). uth Africanmaiii~(~iai&~I C3 ~B -5 v c) eo ~0 -10< ~ increasingrateof sulphatereduction -15 i i i +5 -5 +10 +15 A34S (%oCDT) +5- decreasmgE .......

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