Environmentally controlled variations in clay mineral assemblages from lake sediments in the Venezuelan Andes
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1990
- ISIDORE Id: 10670/1.aa5116...
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Baruch Weingarten et al., « Environmentally controlled variations in clay mineral assemblages from lake sediments in the Venezuelan Andes », Sciences Géologiques, bulletins et mémoires (documents), ID : 10670/1.aa5116...
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X-ray diffraction analysis of the 90%) with subordinate kaolinite and traces of chlorite. The clay-mineral assemblages generally reflect altitudinal patterns of temperature and precipitation, although the alkaline water chemistry of the Tierra Caliente lake and local bedrock influences modify the patterns. A long core (6.3 m) retrieved from one lake in the Tierra Templada zone shows the clay minerals before -10,000 years B.P. to be similar to those in tic modem Tierra Helada zone. A climatic change accompanying glacial retreat is inferred.
