Abstract
Many authors believe in the possibility of diamond transport for hundreds of kilometers by fluvial sedimentary processes. This work attempts to show by the integration of alluvial placer observations, experimental data analysis and case study that diamonds cannot be transported for long distances by tractive processes. The presence of diamond in a large geographical area (hundreds of square kilometers) implies in the necessity of the presence of multiple well distributed sources, including primary (kimberlite and lamproite) or secondary (sedimentary rocks) sources. The coarse facies related to the glaciogenic sediments are the most important sources among the secondary host rocks. The case studies exemplified in this paper show clearly that the wide dispersion of diamonds is mainly explained by the presence of secondary sources with regional distribution.
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