Pleistocene lacustrine stromatolites, composed of calcium carbonate, fluorite, and dolomite, from Lake Natron, Tanzania: depositional and diagenetic processes and their paleoenvironmental significance
Identifieur interne : 001447 ( Main/Exploration ); précédent : 001446; suivant : 001448Pleistocene lacustrine stromatolites, composed of calcium carbonate, fluorite, and dolomite, from Lake Natron, Tanzania: depositional and diagenetic processes and their paleoenvironmental significance
Auteurs : Michel Icole [France] ; Jean-Pierre Masse [France] ; Guy Perinet [France] ; Maurice Taieb [France]Source :
- Sedimentary Geology [ 0037-0738 ] ; 1990.
Abstract
On the western edge of Lake Natron, Tanzania, the lower Pleistocene lacustrine series contains some stromatolitic layers which are mainly composed of fluorite rather than calcium carbonate, as is the case with most stromatolites. Moreover in the uppermost part of some layers, fluorite is replaced by dolomite, but preserving the petrographic texture. The uppermost part of the section (around 50 m above the present lake level) is capped by calcareous stromatolitic benches which were known to delimit the ancient shorelines. These stromatolites are unaltered. The composition of the stromatolitic bodies seems to be controlled by the lake chemistry, which is in turn related to the lake volume. Chemical variations of the lake water might reflect the lake level changes resulting from climatic oscillations and be recorded in the mineral composition of the stromatolites, and therefore provides a paleoenvironmental record of lake water composition as the lake was changing from a large freshwater lake to a playa-lake similar to the present Lake Natron. Our results illustrate depositional and diagenetic processes that may occur in alkaline environments such as possible pseudomorphism of the calcium carbonates, origin of the fluorite-ore and dolomitization.
Url:
DOI: 10.1016/0037-0738(90)90105-3
Affiliations:
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type="abstract" xml:lang="en">On the western edge of Lake Natron, Tanzania, the lower Pleistocene lacustrine series contains some stromatolitic layers which are mainly composed of fluorite rather than calcium carbonate, as is the case with most stromatolites. Moreover in the uppermost part of some layers, fluorite is replaced by dolomite, but preserving the petrographic texture. The uppermost part of the section (around 50 m above the present lake level) is capped by calcareous stromatolitic benches which were known to delimit the ancient shorelines. These stromatolites are unaltered. The composition of the stromatolitic bodies seems to be controlled by the lake chemistry, which is in turn related to the lake volume. Chemical variations of the lake water might reflect the lake level changes resulting from climatic oscillations and be recorded in the mineral composition of the stromatolites, and therefore provides a paleoenvironmental record of lake water composition as the lake was changing from a large freshwater lake to a playa-lake similar to the present Lake Natron. Our results illustrate depositional and diagenetic processes that may occur in alkaline environments such as possible pseudomorphism of the calcium carbonates, origin of the fluorite-ore and dolomitization.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Provence-Alpes-Côte d'Azur</li></region><settlement><li>Marseille</li></settlement><orgName><li>Université de Provence</li></orgName></list><tree><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Icole, Michel" sort="Icole, Michel" uniqKey="Icole M" first="Michel" last="Icole">Michel Icole</name></region><name sortKey="Masse, Jean Pierre" sort="Masse, Jean Pierre" uniqKey="Masse J" first="Jean-Pierre" last="Masse">Jean-Pierre Masse</name><name sortKey="Perinet, Guy" sort="Perinet, Guy" uniqKey="Perinet G" first="Guy" last="Perinet">Guy Perinet</name><name sortKey="Taieb, Maurice" sort="Taieb, Maurice" uniqKey="Taieb M" first="Maurice" last="Taieb">Maurice Taieb</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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