Cool Climate Lateritic and Bauxitic Weathering

Coexisting goethite and gibbsite from a high-paleolatitude (55°N) Late Paleocene laterite: Concentration and 13C/12C ratios of occluded CO2 and associated organic matter

“…Lateritic soils typically form in the warm and humid conditions found in the modern low-latitude tropics (Krishnaswamy, 1986; however, see Taylor, et al, 1992). Yet, lateritic profiles of Late Paleocene age found in southern Australia and Tasmania (Taylor et al, 1992), Ireland (Hill et al, 2000), and Iceland (Nilsen, 1978) formed at southern and northern paleolatitudes of 50°to 60° (Scotese and Golonka, 1992).…”

Pre‐Quaternary landscape inheritance in Australia

“…1), and they concluded that a much greater part of the modern landscape than previously recognised may have developed in the early and mid Mesozoic. Furthermore, their results suggested that much of the Australian regolith formed in comparatively cold conditions, in contrast to some traditional interpretations that lateritisation and deep weathering largely occurred in tropical and subtropical climates (see also Taylor et al, 1992). 3 On Kangaroo Island in South Australia, a thick kaolinised weathering profile is developed on Permian sediments beneath the Jurassic Wisanger Basalt (Daily et al, 1974).…”

“…280 Ma), there was extensive development of coal measures (Greta Coal Measures) in the Sydney Basin, including bauxitic weathering profiles (Dickins, 1996). While bauxitic weathering is often associated with tropical climates, Taylor et al (1992) described early Tertiary lateritic and bauxitic weathering profiles from southern Australia, formed under a wet cool to cold climate when the region lay at about 608 S latitude.…”

Supergene and hypogene alteration in the dual-use kaolin-bearing coal deposit Angren, SE Uzbekistan

“…A rather monotonous mineral assemblage of kaolinite with some ultrastable heavy minerals such as rutile and anatase furnish mineralogical support to this idea. Bird and Chivas (1989) and Taylor et al (1992) showed that kaolins and laterites may form also in cooler climates, given a surface stability over a long time scale. This agrees with the accessory minerals found in kaolin I, discussed below.…”