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Stable Isotope Composition of the Miocene Dinaride Lake System Deduced from Its Endemic Mollusc Fauna

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Stable Isotope Composition of the Miocene Dinaride Lake System Deduced from Its Endemic Mollusc Fauna Hydrobiologia DOI 10.1007/s10750-011-0618-3 SPECIATION IN ANCIENT LAKES Stable isotope composition of the Miocene Dinaride Lake System deduced from its endemic mollusc fauna Mathias Harzhauser • Oleg Mandic • Christine Latal • Andrea Kern Received: 6 July 2010 / Accepted: 6 February 2011 Ó Springer Science+Business Media B.V. 2011 Abstract The aragonite shells of 55 mollusc spec- values are attributed to species preferring freshwater imens from the late Early and early Middle Miocene habitats of springs or small rivulets, thus representing of two palaeolakes of the Dinaride Lake System the freshwater end-member. The overall rather high (DLS) are analysed for their d18O and d13C signa- values in both stable isotopes result from a combi- tures. The data set has a bimodal distribution with a nation of evaporation effects and the influx of already prominent peak between -3 and -4% for both isotopically heavy freshwater from the karstic catch- isotopes and a second much weaker peak at more ment area. Thus, the DLS is interpreted as a closed depleted values of c. -9to-7%. Taxa with ‘heavy’ freshwater system without marine influence but with values are interpreted to represent the inhabitants of enough contribution of freshwater to keep the oxygen the shores or shallow areas of the lake. Depleted values close to -5%. Mean lake surface water 18 temperatures, based on the d Oshell values, excluding the freshwater end-member taxa, range around roughly 19–21°C. Despite the problems in calculating these temperatures, the values are in agreement with mean annual air temperatures deduced from the palaeobotanic record by applying the Coexistence Guest editors: C. Sturmbauer, C. Albrecht, S. Trajanovski & Approach method. The seasonal range was around T. Wilke / Evolution and Biodiversity in Ancient Lakes 10–11°C and is mainly recorded in shells from lake M. Harzhauser (&) Á O. Mandic Á A. Kern settings. Taxa with freshwater end-member signa- Naturhistorisches Museum Wien, tures lack this range due to the more stable temper- Geologisch-Pala¨ontologische Abteilung, ature regime and less fluctuating dissolved inorganic Burgring 7, 1014 Wien, Austria e-mail: [email protected] carbon (DIC) pool. Congeneric species from the same stratigraphic horizon often display discrete but O. Mandic e-mail: [email protected] different isotope signatures. This fact suggests habitat segregation and might be a major factor for sympatric A. Kern e-mail: [email protected] speciation and the endemic radiation within the mollusc fauna of the DLS. C. Latal Institut fu¨r Angewandte Geowissenschaften, Keywords Stable isotopes Á Freshwater molluscs Á Technische Universita¨t Graz, Rechbauerstraße 12, 8010 Graz, Austria Endemism Á Ancient lakes Á Coexistence approach Á e-mail: [email protected] Miocene 123 Hydrobiologia Introduction Geological setting The Dinaride Lake System (DLS) was a huge Miocene The sampled localities are situated in the Sinj and Drnisˇ wetland system extending over an area of c. basins which are two Dinaride intramontane basins 75,000 km2, consisting of several palaeolakes. The (Korbar, 2009), situated in two karst poljes of 380 m deposits of the DLS cover parts of Croatia, Bosnia and mean topographic elevation (Fig. 1). They are tecton- Herzegovina, Montenegro, Serbia, Hungary and ically disjoined by the 1,508 m high, NW–SE striking Slovenia (Krstic´ et al., 2003). It harboured a diverse Mt. Svilaja. The latter is composed by Triassic to and fully endemic mollusc fauna which was described Cretaceous platform carbonates representing the NE largely already in the nineteenth century (Harzhauser margin of both basins (Ivanovic´ et al., 1977; Papesˇ & Mandic, 2008). Despite its size and the importance et al., 1984;Raic´ et al., 1984). Their SE margin of the mollusc fauna, the DLS gained surprisingly little comprises a series of Upper Cretaceous to Middle attention by the scientific community. A poorly Eocene platform carbonates, Middle Eocene Flysch resolved stratigraphy and the unclear relations to other successions and Upper Eocene to Lower Oligocene Miocene and Pliocene faunas might have been main Molasse deposits including conglomerates and paralic reasons for this low interest. Important contributions coal intercalations (Babic´ & Zupanicˇ, 2007). by Mandic et al. (2009), Jime´nez-Moreno et al. (2008, The basins belong to the main Dinaride wrenching 2009) and de Leeuw et al. (2010) improved the zone of the Karlovac–Split suture (Schmid et al., 2008) stratigraphic correlations, clarified the absolute ages and are related to Early to Middle Miocene transpres- of important sections and provided data on sedimen- sional tectonics, resulting from N-ward oblique-slip tary environments and palaeoclimate. One of the motions of the underthrusting Adriatic block (Tari, remaining problems in the DLS is its water chemistry 2002). This event triggered formation of numerous (Krstic´ et al., 2003; Hajek-Tadesse et al., 2009). related and synchronous NW–SE striking, restricted Apparent similarities in taxonomic composition pull apart basins, distributed across the Dinarides and and evolutionary patterns with the much younger the southern Pannonian Basin. Therein, a mosaic Late Miocene Lake Pannon suggest comparable freshwater system developed which is termed the environmental conditions (Harzhauser & Mandic, Dinaride Lake System (Krstic´ et al., 2003; Harzhauser 2008, 2010). In particular, Early and Middle Miocene & Mandic, 2008). The studied samples, originating faunas of the DLS components Lake Sinj and Lake from two closely related palaeolakes of the DLS-SE Drnisˇ bear several taxa which are morphologically margin, are located today between 25 and 43 km N reminiscent of Late Miocene dreissenid and mela- from the Mediterranean harbour town Split in SE nopsid species from Lake Pannon. Stable isotope Croatia (Fig. 1). Whereas Lake Sinj was moderately studies on Lake Pannon molluscs suggested that Lake sized with 140 km2 surface area, Lake Drnisˇ was rather Pannon was a slightly alkaline and brackish lake small with a surface area of only 25 km2. The latter (Harzhauser et al., 2007a, b). Therefore, it was estimate is, however, based on sediment distribution tempting to assume similar water chemistry for the and considering its squeezed tectonic position the Dinaride Lake System. Hypothetically, slight marine original size was certainly larger. The faunal compo- influx from the Adriatic Sea or contributions by sition of the two basins is similar but not completely Permian evaporites (Sˇusˇnjara & Sakacˇ, 1988) could identical (Brusina, 1884). As their synchronicity is have played a role for brackish water conditions. indicated by similar taxa together with corresponding Herein, we focus on the stable isotope signatures lithological features they rather did not belong to the (oxygen, carbon) of representative mollusc species to same lake but were only in temporary connection shed light on the water geochemistry of the DLS. The (Jurisˇic´-Polsˇak, 1999). Furthermore, the tectonic set- selected taxa represent different feeding strategies ting points to post-depositional transpression that and ecological guilds. Based on the environmental shifted the basins into a closer position to one other. requirements of modern relatives, these taxa are also The initial transtensional regime caused massive suggested to have preferred different habitats within gypsum doming from the basement horizon (Mandic the lake. The data will thus document the overall et al., 2009). The gypsum originates from Permian isotope signature of the DLS. shales representing the main Dinaride thrust belt 123 Hydrobiologia Fig. 1 Geographic and geologic overview of the study area. Dark shaded areas represent sediment distributions of the Dinaride Lake System. Compiled after geologic maps of former Yugoslavia 1:100,000 and 1:500,000 and ESRI ArcGIS base maps decollement horizon (Tari, 2002). In both studied Ar/Ar geochronology and magnetostratigraphy (de basins, this gypsum underlies directly the basal lake Leeuw et al., 2010). This study revealed Lake Sinj as sediments (Ivanovic´ et al., 1977;Sˇusˇnjara & Sakacˇ, a long-lived palaeolake persisting about 3 My 1988). between 18 and 15 Ma. The absolute dating allows a very precise estimation of the age of the studied The age of the fauna fauna, collected by Kittl (1895) at 5 localities: Miocˇic´ A (16°13044,30800E43°52035,79300N) and Miocˇic´ B The lacustrine series of the Sinj Basin was currently (16°13014,94800E43°52037,26700N) in the Drnisˇ Basin dated at the Lucˇane section by means of integrated and Lucˇane (16°35025,57200E43°43011,31700N), 123 Hydrobiologia Stuparusˇa (16°37025,93700E43°42018,33600N) and shells, such as Orygoceras (marked by the appendix G Ribaric´ (16°32019,18700E43°4909,14400N) in the Sinj in sample numbers in Table 1). The main scope of Basin (Fig. 1). Only the Lucˇane locality provides a these measurements was to achieve a characteristic long section which is still accessible and described in spectrum of isotope values, represented by the DLS detail in Mandic et al. (2009) and de Leeuw et al. molluscs. Therefore, only few specimens were sclero- (2010). The other localities are already inaccessible chronologically analysed to receive data on seasonal- (e.g. Ribaric´) or restricted to very poor and aban- ity. Oxygen and carbon isotopes were determined by doned outcrops (e.g. Miocˇic´). Therefore, no litholog- reaction of the samples with 100% phosphoric acid at ical logs can be provided for Miocˇic´, Ribaric´ and 70°C in a Finnigan Kiel II automated reaction system, Stuparusˇa. and measured with a Finnigan Delta Plus isotope-ratio The assemblage with Prososthenia schwarzi mass spectrometer at the Institute of Earth Sciences, (Neumayr, 1875) occurs at the Lucˇane section in the University of Graz. Measurements of NBS-19 and an uppermost lignite which is intercalated in a limestone internal laboratory standard yielded a standard devia- series (Jime´nez-Moreno et al., 2008; Mandic et al., tion of 0.1% for both d18O and d13C. Isotope data are 2009). It starts above the ash layer dated with given in % relative to VPDB.
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