Porifera-microbialites of the Lower Liassic (Northern Calcareous ...

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98 significance of microbial involvement and, if possible, to confirm taxonomic classification by sponge specific biomarkers (e.g. derivates of demospongic acids). The ion chromatograms (supplement 5) do not show any sponge specific substances and only a minor amount of bacterially sourced compounds. The total hydrocarbon fraction displays the usual pattern of modal n-alkane distribution ranging from C14-C38. Branched alkenes, that could be of microbial source (due to sulfate reducing bacteria, Peckmann et al. 1999), are present in low concentration. Hopanoids, as being more characteristic residue of bacteria metabolism (Rohmer et al. 1984), were not detected. On the other hand, a significant concentration of iso/anteiso-alkanoic acids is found in the Adnet limestone. Such terminally branched fatty acids are known as important constituents of bacterial lipids, thus their occurrence is in agreement with the assumption of microbially mediated carbonate formation (in decaying sponge organic matter).
Triassic-Jurassic Boundary Event 99 9. Triassic-Jurassic Boundary Event In the last decade, research on the Triassic-Jurassic mass extinction was strongly enforced, currently by the IGCP-Project 458 - Triassic-Jurassic Boundary Events. The T-J event was characterized rather by several local changes than by one big turn-over, hence, global effects have been discussed controversially (Hallam 1989, 2002; Marzoli et al. 1999; McElwain et al. 1999; Tanner et al. 2001; Hesselbo et al. 2002; Olsen et al. 2002; Ward et al. 2001; a.o.). Eustatic sea level changes caused high extinction rates especially in the shelf areas and particular low- stands were responsible for a lot of shallow marine sequences displaying a hiatus in sedimentation just where the event should have been documented. A relation between the Triassic-Jurassic boundary event and carbon isotope excursions in δ 13 Ccarb and δ 13 Corg has also been mentioned from several localities (Germany: McRoberts et al. 1997; Turnsek et al. 1999; Hungary: Pálfy et al. 2001; Canada: Ward et al. 2001; England: Hesselbo et al. 2002). Disregarding those of apparently diagenetic origin (Morante and Hallam 1996; Ward et al. 2001), a hiatus in the fossil record often prevents exact stratigraphical correlations, thus, a lot of work still has to be done correlating the few present data from all over the world in order to gain insight into the driving forces of the event (Guex et al. 2002; Pálfy et al. 2001). At Steinplatte/Plattenkogel locality a new ammonite found of Psiloceras sp. from the spiculite base let allocate the stromatactis limestones to the Lower Hettangian. This also corresponds with the geochemical data, supposing that the isotopic pathway in sediments at Plattenkogel hill displays the beginning of the same amplitude that is shown in Adnet quarries. Nevertheless it remains unknown so far whether the δ 13 C-excursions at Adnet and Steinplatte show only one amplitude of probably a series of little fluctuations or just the end of a bigger carbon anomaly. Anyway, it should be considered that in contrast to some deep-water settings the isotopic records from shallow marine sediments of the Tethyian region could have been overprinted by several local paleoenvironmental changes. At Steinplatte/Plattenkogel hill, for example, an effect of meteoric diagenesis seems to decrease upward from the capping facies (Stanton and Flügel 1989) to the cements of the stromatactis cavities (Mazzullo et al. 1990). The following succession is characterized by constantly increasing water depths so that an emergence later than the origin of the spiculite layer is unlikely. Probably the sediments of the Lower Liassic sequence were influenced later by percolating waters that were trapped first in Upper Triassic time and then reactivated during Liassic burial.
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Porifera-microbialites of the Lower
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Abstract In the aftermath of the Tr
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Zusammenfassung Nach dem Aussterbee
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Content 1. Introduction ...........
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Introduction 9 1. Introduction In U
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Geological Setting 11 2. Geological
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Geological Setting 13 Fig. 2. Locat
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Methods 15 3. Methods In the Rot-Gr
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Localities (Facies and Sponge Analy
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Page 47 and 48: Localities (Facies and Sponge Analy
Page 49 and 50: Localities (Facies and Sponge Analy
Page 51: Localities (Facies and Sponge Analy
Page 54 and 55: 54 and ferromanganese crusts. The b
Page 56 and 57: 56 5.1.1. The Sponge Fauna of the S
Page 58 and 59: 58 Skeleton: Lyssacinosid type with
Page 60 and 61: 60 Fig. 29a. Skeleton types and ass
Page 62 and 63: 62 new data from recent species to
Page 64 and 65: 64 sheltered by the adjacent sand d
Page 66 and 67: 66 In addition to the episodic sedi
Page 68 and 69: 68 found in the most condensed sect
Page 70 and 71: 70 5.2.1. The Sponge Fauna of the S
Page 72 and 73: 72 5.2.2. Diagenesis Sponge-dominat
Page 75 and 76: Fossil Record of Sponges 75 6. Foss
Page 77 and 78: Fossil Record of Sponges 77 Fig. 35
Page 83 and 84: Comparison with other Spiculites 83
Page 85: Comparison with other Spiculites 85
Page 88 and 89: 88 Hallam 1996; Hallam and Goodfell
Page 90 and 91: 90 From the Lower Liassic Kendlbach
Page 92 and 93: 92 At Steinplatte/Plattenkogel loca
Page 94 and 95: 94 8.2. Major and Trace Elements We
Page 96 and 97: 96 sediments. Due to this “contam
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Page 102 and 103: 102 � The Lower Liassic sediments
Page 104 and 105: 104 Böhm F (1992) Mikrofazies und
Page 106 and 107: 106 Garrison RE, Fischer AG (1969)
Page 108 and 109: 108 Krause FF, Scotese CR, Nieto C,
Page 110 and 111: 110 Olsen PE, Kent DV, Sues H-D, Ko
Page 112 and 113: 112 Schulze FE (1904) Hexactinellid
Page 114 and 115: 114 Wendt J (1969) Stratigraphie un
Page 116 and 117: Plate 1 Glasenbachklamm - Lower Lia
Page 118 and 119: Plate 2 Mühlstein-South - Hornstei
Page 120 and 121: Plate 3 Sonntagkendlgraben - Flecke
Page 122 and 123: Plate 4 Hochgern - Liassic sediment
Page 124 and 125: Plate 5 Scheibelberg - Type locatio
Page 126 and 127: Plate 6 Luegwinkel - Liassic sedime
Page 128 and 129: Plate 7 Moosbergalm - Slope and bas
Page 130 and 131: Plate 8 Tannhauser Berg - Liassic s
Page 132 and 133: Plate 9 Adnet / Rot-Grau-Schnöll Q
Page 134 and 135: Plate 10 Adnet / Rot-Grau-Schnöll
Page 144 and 145: Plate 15 Adnet / Lienbacher Quarry
Page 146 and 147: Plate 16 Adnet / Eisenmann Quarry -
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Plate 17 Steinplatte / Plattenkogel
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Plate 21 Diapir of Murguia / Spain
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Plate 22 Arctic Vesterisbanken Seam
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Supplement 1.1 (datas to Fig. 42) -
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Supplement 1.2 (datas to Fig. 43 +
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Supplement 2. (datas to Fig. 47) -
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Supplement 3.2 (datas to Fig. 46) -
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Supplement 4. - Energy Dispersive X
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Supplement 6. - Register of Localit
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Steinplatte/Fischer’s Coral Garde
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Publications Parts of this study ar
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Curriculum Vitae Geboren in Bremerh
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