First find of biogenic activity in the Palaeoproterozoic of the Singhbhum craton (E India)
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Date
2013-09-15
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Wydawnictwo Naukowe UAM
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Abstract
The Palaeoproterozoic succession of the Singhbhum craton in E. India was hitherto considered as almost entirely siliciclastic
and partly volcanogenic. Here we describe, from the fine-grained, tidally influenced shale facies of the Palaeoproterozoic
Chaibasa Formation (2.1–1.6 Ga), a fine, originally more or less horizontal, wavy to strongly undulating
(later locally deformed) lamination. Investigation of these laminae shows that they must be ascribed to the accumulation
of fine particles on microbial mats that covered a sandy substrate. The structures must therefore be considered as
stromatolites, features that are accepted as proof of the presence of micro-organisms, in this case most probably cyanobacteria.
The interpretation of biogenic activity is supported by microscopic analysis. It is the first description of traces
left by biogenic activity that took place in the Palaeoproterozoic of the Singhbhum craton.
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Keywords
stromatolites, Palaeoproterozoic, Chaibasa Formation, Singhbhum craton, siliciclastic, shelf
Citation
Geologos, 2013, vol. 19, 3, pp. 185-192
ISBN
978-83-232187-4-6