ISBN: 3-540-66205-7
TITLE: A Holocene Sedimentary Record from Lake Silvana, SE Brazil
AUTHOR: Rodrigues-Filho, Saulo; Mller, German
TOC:

1 Abstract 1
2 Introduction 5
2.1 Study area 8
2.1.1 Geology and geomorphology 9
2.1.2 Climate and vegetation 12
2.2 The dammed-valley lakes of Rio Doce 14
2.3 The lacustrine environment in the Rio Doce lakes and related redox processes 19
2.4 Chemical weathering in tropical regions 24
3 Methods 27
3.1 Sampling 27
3.2 Analyses 28
4 Results 33
4.1 Lake Sediments - paleoenvironmental proxies from core SB1 33
4.1.1 Paleoenvironmental zone I (1270-1180 cm) 33
4.1.2 Paleoenvironmental zone II (1180-1160 and 990-970 cm) 35
4.1.3 Paleoenvironmental zone III (1160-990 and 970-360 cm) 40
4.1.4 Paleoenvironmental zone IV (360-0 cm) 42
4.2 Weathering profiles EG1 and EG2 48
4.2.1 Mercury accumulation at the top of profiles 55
4.3 Physical and chemical parameters of the water column of Lake Silvana 57
5 Discussion 63
5.1 Correlation with global-scale climatic events 66
5.2 Siderite-inferred recurrence of climatic events 70
6 Conclusions 73
7 References 75
8 Appendices 87
END
