Standard modal grain analysis in sandstones
The GAZZI-DICKINSON method
A grain-size independent evaluation of the provenance
of sandstones and geodynamic implications
Materials: petrographic microscope, thin sections stained for carbonates and feldspars
Wilfried H. Winkler (Geological Institute ETH Zurich, Switzerland)
Biogenics and bioclasts
Standard modal grain analysis in sandstones
GAZZI-DICKINSON
Grain types
Monocrystalline Quartz Qm
Polycrystalline Quartz Qp
QT
Tectonic Quartz
QT
Tectonic Quartz
Tectonite quartz-mica TQM
Tectonite quartz-mica TQM
Polycrystalline Mica Mp
K-feldspar K and Plagioclase P
K-feldspar K
Plagioclase P
Chert (sedimentary)
Chert (sedimentary)
Chert (sedimentary)
Chert (sedimentary)
Chert (sedimentary)
Chert (sedimentary)
Volcanic-hypabyssal Lithoclast Lvh
Volcanic-hypabyssal Lithoclast Lvh
Volcanic-hypabyssal Lithoclast Lvh
Volcanic-hypabyssal Lithoclast Lvh
Volcanic-hypabyssal Lithoclast Lvh
Sedimentary lithoclast Ls
Sedimentary lithoclast Ls
Sedimentary
lithoclast Ls
Sedimentary lithoclast Ls
Intrabasinal clasts
Three stepped approach in sandstone provenance evaluation in typical Alpine Flysch
Factors controlling the composition of sandstones:
o source rocks
o grain size
o distance of transport
o climate in source terrane and routing
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