Clay Minerals in Lake Frome Sediments of Australia and Their Paleoclimatic Implications

作     者：郑洪汉 J.M.BOWLER 

作者机构：Department of Biogeography and Geomorphology Australian National University Institute of Geochemistry Academia Sinica 

出 版 物：《Acta Geochimica》 (地球化学学报(英文版))

年 卷 期：1986年第5卷第3期

页      面：241-249页

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

主　　题：Lake Clay Minerals in Lake Frome Sediments of Australia and Their Paleoclimatic Implications 

摘      要：Clay minerals in 32 samples collected from the upper 6 meters of drill core LF 82/1-3 inLake Frome, Australia have been examined using X-ray powder diffraction techniques. Theresults show that the clay mineral species are predominated by illite, kaolinite and a smallamount of montmorillonite. Minor chlorite and verndculite can also be identified in some of thesamples. In terms of clay mineral species, crystallinity and other characteristics, the upper 6-mcore can be divided into 3 sections, the boundaries of which are marked at depths of about 125-150 cm and 415-455 cm with ages of 14 and 19 thousand years B.P., respectively. The middlesection at a burial depth of 150-415 cm may have been deposited under moist conditions whilethe other two under relatively dry conditions. Additionally, some slight climatic fluctuationsseem possible in different stages.