Early Palaeozoic Peri-Gondwana Terranes: New Insights from by M. G. Bassett

By M. G. Bassett

Following the past due Neoproterozoic - early Cambrian breakup of the supercontinent Rodinia, Gondwana advanced as one of many significant continental lots in the world, embracing so much of South the USA, Africa, Australasia, Antarctica, a lot of western Europe and elements of Asia. round its margins have been a variety of different terranes that had various tectonic and biogeographical affinities with the most continental block. This booklet contains a sequence of reports and multidisciplinary learn papers that jointly discover the tectonic, palaeogeographical and palaeobiogeographical evolution of the weather that made up the peri-Gondwanan college. The stratigraphical scope of the insurance embraces the past due Precambrian via early Devonian, supplying a accomplished review of structural, stratigraphical and organic evolution via this important period of Earth background. Integration of those a number of procedures through the quantity could be of broad-based curiosity to a variety of geoscientists.The Geological Society of LondonFounded in 1807, the Geological Society of London is the oldest geological society on the planet, and one of many biggest publishers within the Earth sciences.The Society publishes a variety of fine quality peer-reviewed titles for teachers and pros operating within the geosciences, and enjoys an enviable foreign attractiveness for the standard of its work.The many parts during which we post in include:-Petroleum geology-Tectonics, structural geology and geodynamics-Stratigraphy, sedimentology and paleontology-Volcanology, magmatic reports and geochemistry-Remote sensing-History of geology-Regional geology courses

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Extra info for Early Palaeozoic Peri-Gondwana Terranes: New Insights from Tectonics and Biogeography - Special Publication 325

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1994) and Rong & Zhan (1996), this genus originated in South China as early as the Late Ordovician (late Katian). By the Rhuddanian, Eospirifer spread to the Australian segment of Gondwana (Sheehan & Baillie 1981) and to the Chingis –Tarbagatai group of terranes in Kazakhstan. It occurs in the Chu–Ili terrane from the early Rhuddanian in association with Stricklandia lens mullochensis Reed (Modzalevskaya & Popov 1995). The earliest spiriferides in Baltica, Laurentia and Siberia are probably post-Aeronian (Sheehan & Baillie 1981; Rong & Zhan 1996).

Siliciclastic deposits of the Dulankara Formation were formed mainly in peritidal environments and unaffected by Late Ordovician post-collisional deformation. thick and then a unit of more than 60 m of sandstone with bidirectional cross-bedding and several coquina storm beds (Fig. 13b). The coquinas contain disarticulated brachiopods, including Sowerbyella sp. and A. kovalevskii, also characteristic of the Dulankara Regional Stage (Popov et al. 1999). Rapid subsidence recorded through the sequence at the beginning of the Late Ordovician closely followed the termination of subduction in front of the Chu– Ili terrane shortly after the Pygodus anserinus Biozone.

Yapeenian to early Darriwilian age (Nikitin 1972; Cooper & Lindholm 1990). Thin interbeds of pelagic radiolarian cherts in the middle of the formation contain abundant conodonts of the Oepikodus evae Biozone. In general, there is continuous development of siliciclastic lithofacies characteristic of submarine fan and slope environments through the Early and Mid-Ordovician along the entire southwestern margin of the Chu –Ili terrane facing the Zhalair– Naiman Fault Zone (Fig. 3). With the exception of several horizons of tuffs in the Middle Member of the Karatal Formation, there are no island arc type Ordovician volcanic or volcanoclastic rocks recorded, and there is no trace of Ordovician or Silurian island arc-related granitic magmatism.

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