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Clay minerals in the late Quaternary sediment of Tulare Lake,California: Implications for climate change, weathering, and erosion processes

引用

International Journal of Sediment Research 2019年第5期34卷 432-443页

作者： Junhua Guo Christine Pyles William Krugh Rob Negrini Department of Geological Sciences California State UniversityBakersfield

The clay mineralogy of Tulare Lake sediment was examined to investigate hydroclimatic and environmental changes in the southern sierra nevada mountains(SNM) since the most recent glacial *** of clay mineral assemblages elucidates significant changes in weathering, erosion, and hydroclimatic condition in the catchment. During the last glacial period(24.4–15.1 cal ka BP), low illite content implies less physical erosion of the granitic batholith rocks and a cold and arid environment in the southern SNM. Abrupt increases of illite content at 21.8–20.8 and 17.6 cal ka BP resulted from the glacier advances to the ablation zone and illite-rich glacier flour was transported down to the lake. The gradual increase of smectite induced by progressive depletion of illite-rich glacier flour from 17.6 cal ka BP toward the end of this period indicates climate was beginning to get warm and wet. From 11.9 to5.3 cal ka BP, two warm and wet periods(10.7–9.4 and 8.2–5.2 cal ka BP) were characterized by high smectite/illite content ratios and low illite crystallinity values, suggesting intensive rainfall precipitation and more physical erosion in the highland and lowland catchment as well as more smectite formation in the terrace soils. Since the last glacial period, physical erosion, in comparison to the chemical weathering,was the dominant process responding to the hydroclimatic change in the Tulare Lake *** to weak chemical weathering was signified by the mostly low illite chemical weathering index of the core sediments. Such results suggest that vegetation cover in the southern SNM was low and limited.

关键词： Clay mineralogy sierra nevada mountains Glaciers Weathering Tulare Lake

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