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Title (Primary) Limnogeological studies of maar lake Ranu Klindungan, East Java, Indonesia
Author Scharf, B.W.; Pirrung, M.; Boehrer, B.; Büchel, G.; Friese, K.; Kusel-Fetzmann, E.; Mages, M.; Treutler, H.-C.; Witkowski, A.;
Journal Amazoniana-Limnologia et Oecologia Regionalis Systemae Fluminis Amazonas
Year 2001
Department SEEFO; FLOEK; ANA; GM;
Volume 16
Issue 3/4
Language englisch;
Abstract

Ranu Klindungan is a lake at the northern lowlands of East Java close to the northern slope of the Tengger Caldera. Outcrops of phreatomagmatic base surge deposits at the inner southern crater slope indicate that the lake is situated in a maar crater. The lake has a surface of 2.1 km(2) and a maximum depth of 126 m. Details to the morphometry are given. Groundwater inflow must be high. The lake is oligomictic and eutrophicated with a shallow epilimnion and a large anoxic hypolimnion. Mn, Fe, and TP have distinct peaks at the upper hypolimnion, probably caused by the groundwater inflow. Profundal sediments of Ranu Klindungan consist of carbonaceous diatom-gyttja and frequent turbidites. Often the fine layered sediments reveal a distinct cyclicity of layers of diatoms, carbonate and finally terrigenous material. Probably the diatom and carbonate layers represent the dry season (June-October), whereas the terrigenous layer is deposited by distal turbidites during the rain season (November-May). We interpret these cycles as varves. Despite tropical weathering, silt-sized minerals in terrigenous layers are mainly fresh feldspars, which points to rapid transport and embedding of these components. Thicker intraclast-turbidites may be associated with strong precipitation events during the rain season. The diatom record confirms this hypothesis: diatom layers are rich in complete valves of planktonic forms, whereas in the terrigenous layers few, mostly broken, valves of littoral species occur. The high proportion of turbidites contributes to the near-horizontal profundal lake bottom.

ID 6763
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=6763
Scharf, B.W., Pirrung, M., Boehrer, B., Büchel, G., Friese, K., Kusel-Fetzmann, E., Mages, M., Treutler, H.-C., Witkowski, A. (2001):
Limnogeological studies of maar lake Ranu Klindungan, East Java, Indonesia
Amazoniana 16 (3/4), 487 - 516