Freshwater stromatolites with the cone-in-cone structure from the Neogene lacustrine sediments of Vietnam |
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Authors: | A. R. Geptner Phan Dong Pha V. V. Petrova Nguen Xuan Huyen Le Thi Nginh Nguyen Minh Quang |
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Affiliation: | 1. Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia 2. Intitute of Geological Sciences (VAST), 84 Chùa Láng Str., Láng Thu’?’ng, ??ng ?a, Hà N?i, Vietnam
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Abstract: | Morphological features of the columnar-stratiform stromatolites, which resemble the cone-in-cone structure, from Neogene lacustrine sediments of northern Vietnam are analyzed. Their structural-textural peculiarities and interrelations with the host terrigenous sediments of a stromatolitic buildup are discussed. It is shown that stages of the growth of columns are recorded in the succession of vertically oriented carbonate plates, which form stromatolites, and in the serrate surface protrusions of the plates at their contacts with host sediments. It is established that replacement of the columnar stromatolites by the stratiform varieties in the section can be related to variations in the intensity of terrigenous material influx to the sedimentation basin. Stratiform stromatolites were formed during relatively slow accumulation of sedimentary material. Appearance of the columnar varieties is attributed to intensification of sedimentation. |
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