Cyclic and event stratification by G. Einsele, A. Seilacher

By G. Einsele, A. Seilacher

The matter of bedding, a easy function of such a lot sedimenta ry rocks, is as previous because the technology of geology itself. We use bedding in structural geology, local correlation and for estimating the time desirous about the strati'9Taphic checklist. however we nonetheless are faraway from totally less than status the methods concerned. this can be quite real for carbonate rocks, the place basic phenomena are often tricky to split from the secondary diagenetic over print. After new curiosity within the topic had arisen from the overseas Deep Sea Drilling venture and from pa leoecological reviews in our personal examine crew (Sonder forschungsbereich fifty three "Pal6kologie"), a Rundgesprach (work store) was once held in Tlibingen on April twenty fifth - twenty seventh 1980. the current quantity, which resulted from this symposium, con tains numerous contributions, together with a few via col leagues that have been not able to wait the assembly itself. Papers whose authors didn't put up an elaborated manu script, are represented by means of abstracts within the shape awarded for the assembly. Our personal curiosity within the challenge envolved from reviews of "Fossil-Bonanzas," similar to the Solnhofen lithographic lime stones or the bituminous Posidonia shales, during which the bizarre variety and protection of fossils indicated extre me environmental stipulations. in the course of those experiences (see sununary experiences in Zbl. Geol. Palaont. II, 1976 and N. Jb. Geol. Palaont., 157, 1978) we learned that even in those situations one unmarried environmental version is mostly insuffi cient to provide an explanation for the conflicting evidences.

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The deposits have extensive footwall alteration and most show clear evidence of having formed on the seafloor. The largest deposits are thought to be concentrated on two or three stratigraphic levels within each terrane (Herrington 1999; Herrington et al. 2000). Lachlan Fold Belt, SE Australia The Lachlan Fold Belt contains a >10km thick Cambrian to Carboniferous stratigraphy that records a complex history of basin development, waves of diachronous deformation, magmatism, accretion and continental growth at the eastern margin of Gondwana (Cas 1983; Gray et al.

Several of the deposits are associated with andesitic and dacitic volcanic centres at these spreading ridges. Water depths at the sites of the VMS deposits range from 16502500 m, and active research is in progress to sample the volcanic host rocks, the sulphide bodies and the hydrothermal fluids that are forming them. Tectonic setting From these summary descriptions of VMS districts and the consensus view at the Hobart workshop, we conclude that all major VMS districts relate to major crustal extension resulting in graben subsidence, marine transgression, development of local or widespread deep marine environments, and injection of mantle-derived mafic magma into the crust (Fig.

Economic Geology Monographs, 10, 123-142. E. D. 1999b. Rare earth and high field strength element geochemistry of the Kidd Creek rhyolites, Abitibi greenstone belt, Canada: Evidence for Archaean felsic volcanism and volcanogenic massive sulphide formation in an Iceland-style rift environment. T. & BLEEKER, W. (eds) The Giant Kidd Creek Volcanogenic Massive Sulfide Deposit, Western Abitibi Subprovince, Canada. Economic Geology Monographs, 10, 471-498. A. P. 1999. Massive copperzinc sulphide deposits in the Urals.

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