Effects of Chemical Weathering and Sorting on the Petrogenesis of Siliciclastic Sediments, with Implications for Provenance Studies

摘要: The bulk chemical compositions, mineralogy, and mineral proportions of sands muds the Mallacoota Basin in southeastern Australia reflect composition weathering profiles mantling source rocks, rather than bedrock. Muds contain abundant clay minerals that are virtually absent from rocks but profiles. Sands strongly enriched quartz relative to even headwaters fluvial system, demonstrating feldspar destruction occurs by situ within before detritus enters system. K-feldspar is proportionally more because plagioclase rapidly destroyed either or Subsequent erosion sorting produce quartz, with high K-feldspar:plagioclase ratios rocks. incorporated into also controlled weat...