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- W2469886971 abstract "In the Sri Lankan Highlands erosion and chemical weathering represent the low end-member of global mountain denudation rates. In this tropical humid setting, highly weathered deep saprolite profiles have developed from high-grade metamorphic charnockite bedrock during spheroidal weathering of the bedrock. The spheroidal weathering produces rounded corestones and spalled rindlets at the rocksaprolite interface. We used detailed textural, mineralogical and chemical analyses to reconstruct the sequence of weathering reactions and their causes. The first mineral attacked by weathering was found to be pyroxene initiated by in situ Fe oxidation. Volumetric calculations suggest that this oxidation leads to the formation of micro-fractures allowing for fluid transport and the dissolution of biotite and plagioclase. The strong ensuing plagioclase weathering leads to formation of high secondary porosity over a small distance and eventually to the final disaggregation of bedrock to saprolite. The first secondary phases are oxides or amorphous precipitates from which secondary minerals (mainly" @default.
- W2469886971 created "2016-07-22" @default.
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- W2469886971 date "2015-01-01" @default.
- W2469886971 modified "2023-09-27" @default.
- W2469886971 title "Causes for low saprolite formation and weathering rates on mountain slopes in a tropical climate" @default.
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