Facies and geochemical correlations in the Upper Hauptdolomit (Norian) of the eastern Lechtaler Alps

An unusually thick (over 1000 m) inter- to infratidal, calcareous, facies development in the Upper Hauptdolomit (Norian) of the eastern Lechtaler Alps, northern Tyrol, was investigated. The special litho- and bio-facies are described in two sections (A and B) and are compared with some geochemical parameters.With reference to Fischer's (1965) original concept, these special facies are shown to correspond, in many details, to the restricted environments of the Trucial Coast, Persian Gulf. Based on previously published ideas (Fischer, 1965; Zankl, 1967, 1971), the special facies development of the Upper Hauptdolomit (Hd) of the eastern Lechtaler Alps can be schematically correlated with the Norian Dachsteinkalk facies: the investigated sections appear to represent the transitional facies between wide supratidal flats (typical Hd) and the less restricted facies of the shallow-marine Dachsteinkalk platform.The paper shows a statistical comparison of the interrelationships of Ca/Mg, Mn, Fe, Zn and insoluble residue, based on correlation coefficients. This data is related to facies.