DOI: 10.1007/s00531-012-0770-7
论文题名: Joint clay-heavy-light mineral analysis: A tool to investigate the hydrographic-hydraulic regime of Late Cenozoic deltaic inland fans under changing climatic conditions (Cuvelai-Etosha Basin, Namibia)
作者: Dill H.G. ; Kaufhold S. ; Lindenmaier F. ; Dohrmann R. ; Ludwig R. ; Botz R.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期: 1 起始页码: 265
结束页码: 304
语种: 英语
英文关键词: Cuvelai-Etosha Basin
; Heavy and light minerals
; Hydraulic regime
; Hydrographic regime
; Inland fan deposits
; North Namibia
Scopus关键词: alluvial deposit
; clay mineral
; climate change
; fan delta
; fluvial deposit
; heavy mineral
; hydrography
; lacustrine environment
; percolation
; physicochemical property
; semiarid region
; zeolite
; Namibia
英文摘要: An interdisciplinary study (major and minor elements, C and O isotopes, heavy and light minerals, phyllosilicates, wireline logs) in northern Namibia unraveled the hydrographic and hydraulic evolution of alluvial-fluvial sediments of the Kunene and Cubango megafans (Etosha-Cuvelai Basin). Three principal aquatic regimes were operative within the megafan complex: (1) the hydrographic regime, (2) the proximal hydraulic regime, (3) the distal hydraulic regime. The allogenic mineral assemblages mirror the hydrographic variation or drainage system and the lithological evolution of the fan sediments (alluvial-fluvial fan, lacustrine environment with evaporites, fan delta progradation). Authigenic heavy minerals are markers of the physical-chemical condition (Eh and pH values) of the hydraulic regime within the proximal fan at the basin margin. Authigenic heavy, light and clay minerals equally contribute to the determination of the fluid chemistry and temperature, as well as the source of chemical constituents of the former pore fluids percolating through the distal fan. Carbonatization was the most pronounced event in the distal hydraulic system and controlled by the presence of biogenic as well as atmospheric carbon. The isotope-based determination of the temperatures, albeit strongly fluctuating, do not exceed 40 °C. The overall pH values determined for the hydraulic regime within the distal fan range from slightly acidic to alkaline. The presence of zeolites attests to some short-lasting but strong deviations from the pH range, mainly towards more alkaline conditions. Heavy, light and clay mineral analyses proved to be a useful tool to determine the (paleo)hydrology of alluvial-fluvial fan systems in tropical arid to semiarid climates. © 2012 Springer-Verlag. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84872302572&doi=10.1007%2fs00531-012-0770-7&partnerID=40&md5=3a076862d33a4ad0efd1ccddebecc8b7
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70577
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Bundesanstalt für Geowissenschaften und Rohstoffe, P.O. Box 510163, 30631 Hannover, Germany; Landesamt für Bergbau, Energie und Geologie, Stilleweg 2, 30655 Hannover, Germany; Geological-Paleontological Department, University Kiel, Olshausenstraße 40-60, 24118 Kiel, Germany
Recommended Citation:
Dill H.G.,Kaufhold S.,Lindenmaier F.,et al. Joint clay-heavy-light mineral analysis: A tool to investigate the hydrographic-hydraulic regime of Late Cenozoic deltaic inland fans under changing climatic conditions (Cuvelai-Etosha Basin, Namibia)[J]. International Journal of Earth Sciences,2013-01-01,102(1)