TY - JOUR

T1 - Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian–Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)

AU - Mrdak, Milica

AU - Wegerer, Eva

AU - Sudar, Milan

AU - Djerić, Nevenka

AU - Đaković, Martin

AU - Gawlick, Hans-Jürgen

PY - 2023

Y1 - 2023

N2 - During the latest Ladinian to earliest Carnian, the Wetterstein Carbonate Platform evolution led to the formationof the first rimmed platforms in the Western Tethys Realm after the Permian/Triassic mass extinction. The overall demiseof the Wetterstein Carbonate Platform is related to the Lunz event (Reingraben event, Mid-Carnian Pluvial Episode orMid-Carnian Wet Intermezzo – Julian 2). However, several questions remain open when comparing the platform demisein the Eastern Alps, the Southern Alps, and the Western Carpathians (ALCAPA) with its demise in the Dinarides/Albanides/Hellenides, where these siliciclastics are practically unknown, except the Outer Dinarides in Croatia orMontenegro (High Karst). Prior to the drowning of the Wetterstein Carbonate Platform in the ALCAPA region withsiliciclastics, the platform emerged due to a sea-level drop around the Julian 1/2 boundary (Carnica event). The underfilledaccommodation space between the platforms is characterized by restricted deep basinal areas with deposition oforganic-rich siliceous limestones, followed by the deposition of fine-grained siliciclastics (Reingraben claystones).In contrast to the ALCAPA region a long-lasting stratigraphic gap is common in the Carnian in the Dinarides/Albanides/Hellenides. Carbonate deposition resumed during the Late Carnian after the demise and uplift of the Wetterstein CarbonatePlatform. In northern Montenegro, near the village Pliješevina, the final demise of the Wetterstein Carbonate Platformaround the Julian 1/2 boundary can be dated by conodont faunas (Carnica conodont zone) in a newly detected Carnianbasinal sequence. Above the fine-grained resediments of the Wetterstein Carbonate Platform (Zlošnica Formation), lessthen 3 m of grey “filament”- and radiolarian-rich biomicrites were deposited, followed upsection by a ~6 m-thick sequenceof siliceous claystones, black cherts and silicified volcanic ashes (Džegeruša Formation). The carbonate-free intercalatedmetabentonites of Julian 2 to Tuvalian age are composed of (biogenic) quartz, and clay minerals of the mica-group(mainly illite), montmorillonite, the smectite group, and mixed layer clay minerals. A controversially discussed environmentalchange around the Julian 1/2 boundary resulted in the demise of the Wetterstein Carbonate Platform and carbonatedeposition was replaced by deposition of siliciclastics. Carbonate production reflecting the onset of a precursor ofthe Dachstein Carbonate Platform evolution started again during the latest Carnian as dated by conodonts.

AB - During the latest Ladinian to earliest Carnian, the Wetterstein Carbonate Platform evolution led to the formationof the first rimmed platforms in the Western Tethys Realm after the Permian/Triassic mass extinction. The overall demiseof the Wetterstein Carbonate Platform is related to the Lunz event (Reingraben event, Mid-Carnian Pluvial Episode orMid-Carnian Wet Intermezzo – Julian 2). However, several questions remain open when comparing the platform demisein the Eastern Alps, the Southern Alps, and the Western Carpathians (ALCAPA) with its demise in the Dinarides/Albanides/Hellenides, where these siliciclastics are practically unknown, except the Outer Dinarides in Croatia orMontenegro (High Karst). Prior to the drowning of the Wetterstein Carbonate Platform in the ALCAPA region withsiliciclastics, the platform emerged due to a sea-level drop around the Julian 1/2 boundary (Carnica event). The underfilledaccommodation space between the platforms is characterized by restricted deep basinal areas with deposition oforganic-rich siliceous limestones, followed by the deposition of fine-grained siliciclastics (Reingraben claystones).In contrast to the ALCAPA region a long-lasting stratigraphic gap is common in the Carnian in the Dinarides/Albanides/Hellenides. Carbonate deposition resumed during the Late Carnian after the demise and uplift of the Wetterstein CarbonatePlatform. In northern Montenegro, near the village Pliješevina, the final demise of the Wetterstein Carbonate Platformaround the Julian 1/2 boundary can be dated by conodont faunas (Carnica conodont zone) in a newly detected Carnianbasinal sequence. Above the fine-grained resediments of the Wetterstein Carbonate Platform (Zlošnica Formation), lessthen 3 m of grey “filament”- and radiolarian-rich biomicrites were deposited, followed upsection by a ~6 m-thick sequenceof siliceous claystones, black cherts and silicified volcanic ashes (Džegeruša Formation). The carbonate-free intercalatedmetabentonites of Julian 2 to Tuvalian age are composed of (biogenic) quartz, and clay minerals of the mica-group(mainly illite), montmorillonite, the smectite group, and mixed layer clay minerals. A controversially discussed environmentalchange around the Julian 1/2 boundary resulted in the demise of the Wetterstein Carbonate Platform and carbonatedeposition was replaced by deposition of siliciclastics. Carbonate production reflecting the onset of a precursor ofthe Dachstein Carbonate Platform evolution started again during the latest Carnian as dated by conodonts.

KW - Triassic

KW - Carnica event,

KW - clay mineralogy

KW - conodont biostratigraphy

KW - Neo-Tethys

M3 - Article

JO - Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian–Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)

JF - Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian–Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)

ER -