By John C. Crowell
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Extra info for Pre-Mesozoic Ice Ages: Their Bearing on Understanding the Climate System (GSA Memoirs 192)
The resulting “banded iron formations” are viewed as resulting from an increase in hydrothermal activity along spreading centers at a time of vigorous plate tectonic activity, including continental fragmentation. Tectonics of glacial sites and preservation potential of the glacial record Plate tectonic concepts and patterns are helpful in visualizing both glacier settings and places where glacial debris and facies accumulate (Fig. 26). Rift shoulders are ideal sites for glaciers shedding till intermixed with nonglacial debris that moves downslope to and beyond rift flanks into deep depositional sites on a basin floor (Schermerhorn, 1974; Young, 1976b, 1991; Eyles, 1993, 1996; Deynoux et al.
Glaciers thrived in southern South America during late Paleozoic time (Fig. 31). , 1996), in the Sierra de la Ventana of southeastern Argentina (Coates, 1969; Amos and López-Gamundi, 1981), in the Falkland Islands (Frakes and Crowell, 1967; Greenway, 1972; Marshall, 1994) and in Bolivia (Helwig, 1972; Fernandez Garrasino, 1981). During times of maximum glaciation, sediment arrived in eastern South America from sources in thenattached southern Africa. An early glaciation of late Namurian–early Westphalian age (ca.
Sea level rose, encroaching upon continents and reducing their freeboard, and climate warmed. , 1997; Evans, 1998). These major changes in the pace of tectonic activity have in turn affected sea level and climate. Tectonic arrangements may also influence the capacity of ocean basins to hold water (Rona 1973; Veevers and Powell, 1987; Powell and Veevers, 1987; Harrison, 1990). For example, orogenic processes may squeeze continents laterally so that they stand high, bringing about a lowering of sea level.
Pre-Mesozoic Ice Ages: Their Bearing on Understanding the Climate System (GSA Memoirs 192) by John C. Crowell