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- W2076172189 abstract "Forty-two tephra beds that have successfully mantled the landscape during 250,000 yr. at Ahuroa Road, Te Kuiti, New Zealand, have each in turn been weathered to allophane and halloysite. Al-rich allophane (proto-imogolite allophane) dominates in all beds except four which have greater amounts of halloysite. Allophane and halloysite appear to have been stable for the past 250,000 yr., and the nature of the parent tephra has not influenced the type of clay formed. The analytical data show that the sequence can be sub-divided into two sections at bed AH33, three-quarters of the way up the sequence. Beds in the upper section are younger than ∼ 70,000 yr. B.P. and have lower allophane, lower total clay, higher rates of accumulation, and show poor colour contrast. The lower section beds have high allophane, high total clay, lower rates of accumulation and strong colour contrast. The allophane-rich beds are considered to have weathered under conditions of warm temperature and moderate to high rainfall (high Si-leaching situations) during interglacial periods. Three of the four halloysite-rich beds are considered to have weathered under low-rainfall conditions (low Si-leaching situations) occurring during colder or glacial periods. The last halloysite-rich bed is found at the base of the sequence. Here halloysite is considered to have formed as a result of Si enrichment when percolating waters perched in the coarse basal bed." @default.
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- W2076172189 date "1985-12-01" @default.
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- W2076172189 title "Weathering of Upper Quaternary tephras in New Zealand" @default.
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- W2076172189 doi "https://doi.org/10.1016/0009-2541(85)90073-7" @default.
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