Abstract: The Carnian Pluvial Episode (CPE) represents one of the recently more attracting topics... more Abstract: The Carnian Pluvial Episode (CPE) represents one of the recently more attracting topics for researchers studying the Earth system evolution and climate changes. It consists of a perturbation of the Triassic arid to semi-arid climate toward more wet conditions lasted slightly more than one million of years. The global impact of this episode has been documented by now, indeed the geological record holds different related proxies. At least three negative excursions of the δ13 C isotope curve have been detected, connected to perturbations of the global carbon cycle. These affected the mega-monsoonal circulation in the Tethys realm, increasing the rate of precipitation and the siliciclastic runoff to the basins. Changes in carbonate factories of shelf carbonates triggered a crisis of high-relief carbonate platforms, most of them being replaced by ramp depositional systems. Biological turnover also occurred, with extinctions and radiations. Traces of the CPE are decipherable in ...
The Dolmia Principale Formation (Main Dolomite) is one of the most known Upper Triassic unit from... more The Dolmia Principale Formation (Main Dolomite) is one of the most known Upper Triassic unit from the Southern Alps. It is mainly related to the inner part of a wide carbonate platform, extending from the Southern Appennines to the Dinarids chain, to the Australpine and to Hungary too. Margin-to-slope facies are known from the Norian, facing both intraplatform basins and open pelagic areas. However, data about the Upper Carnian start-up stage are limited to the northeastern Friuli province, and less is known on the early depositional system. In order to increase knowledge on first evolutionary stages, the Julian- Tuvalian succession has been investigated by studying several geological sections spread in the eastern Southern Alps, from the eastern Cadore region up to northwestern Slovenia. Multi-disciplinary examinations have been carried on, involving macro- and micro-facies analysis, sequence- stratigraphy, biostratigraphy and geochemistry (whenever possible). Like in many sectors ...
In the Dolomites region, Middle Triassic tectonics was associated with fast subsidence rates and ... more In the Dolomites region, Middle Triassic tectonics was associated with fast subsidence rates and a Late Ladinian magmatic event that induced epicrustal intrusions (Monzoni, Predazzo, Cima Pape) and a significant shoshonitic-basaltic volcanism. Contrasting scenarios (from transpressional/transtensional tectonics to subduction backarc extension) were proposed to explain these tectonics and magmatism (Lustrino et al., 2019 and reference therein). In order to contribute to unravel of this issue, we built subsidence curves and maps for different Triassic periods, based on cross sections and well data. In particular, we analysed the thicknesses of four Triassic carbonate systems (represented by Contrin Fm., Sciliar Fm., Cassian Dolomite and Heiligkreuz Fm.) in 21 areas spread on the central-eastern Southern Alps. Subsidence calculations, covering a time span of about 12 Ma (from Illyrian to Tuvalian), provided us the opportunity to quantify local and regional subsidence rates, and to cons...
Tectonic activity in the Mediterranean area (involving migrations of old orogenic belts, formatio... more Tectonic activity in the Mediterranean area (involving migrations of old orogenic belts, formation of basins and building of orogenic systems) has been determined by the convergence of the confining plates (Nubia, Arabia and Eurasia). Such convergence has been mainly accommodated by the consumption of oceanic and thinned continental domains, triggered by the lateral escapes of orogenic wedges. Here, we argue that the implications of the above basic concepts can allow plausible explanations for the very complex time-space distribution of tectonic processes in the study area, with particular regard to the development of Trench-Arc-Back Arc systems. In the late Oligocene and lower–middle Miocene, the consumption of the eastern Alpine Tethys oceanic domain was caused by the eastward to SE ward migration/bending of the Alpine–Iberian belt, driven by the Nubia–Eurasia convergence. The crustal stretching that developed in the wake of that migrating Arc led to formation of the Balearic basi...
The Yanchang Formation was deposited during the Middle Triassic in a vast lacustrine basin in the... more The Yanchang Formation was deposited during the Middle Triassic in a vast lacustrine basin in the modern Ordos Basin and is a main target for hydrocarbon exploration in Central China. It is divided, based on sedimentary cycles and lithology, into the Chang 10 (the oldest) to Chang 1 (the youngest) members. During the deposition of the Chang 7 Member, the Ordos lake system reached its maximum depth and large volumes of organic-rich sediments were deposited. The evolution of the Ordos Basin sedimentary system during this phase is, however, not completely understood, and uncertainty still exists as for the chronostratigraphy of Chang 7 Member. We acquired palynological markers and palynofacies and a high-resolution δ13Corg record through the entire Chang 7 Member, and a ID-TIMS 206Pb/238U date of 240.95 ± 0.033 Ma from a volcanic ash bed in the middle of this Member. These imply that the maximum deepening phase of the lacustrine system was during the earliest Ladinian. Evidence of marine influence in the Ordos Basin at that time and comparison to the sea-level oscillations observed in Western Tethys suggest that a global eustatic rise and highstand may have played a role in determining lake-level variations
Abstract: The Carnian Pluvial Episode (CPE) represents one of the recently more attracting topics... more Abstract: The Carnian Pluvial Episode (CPE) represents one of the recently more attracting topics for researchers studying the Earth system evolution and climate changes. It consists of a perturbation of the Triassic arid to semi-arid climate toward more wet conditions lasted slightly more than one million of years. The global impact of this episode has been documented by now, indeed the geological record holds different related proxies. At least three negative excursions of the δ13 C isotope curve have been detected, connected to perturbations of the global carbon cycle. These affected the mega-monsoonal circulation in the Tethys realm, increasing the rate of precipitation and the siliciclastic runoff to the basins. Changes in carbonate factories of shelf carbonates triggered a crisis of high-relief carbonate platforms, most of them being replaced by ramp depositional systems. Biological turnover also occurred, with extinctions and radiations. Traces of the CPE are decipherable in ...
The Dolmia Principale Formation (Main Dolomite) is one of the most known Upper Triassic unit from... more The Dolmia Principale Formation (Main Dolomite) is one of the most known Upper Triassic unit from the Southern Alps. It is mainly related to the inner part of a wide carbonate platform, extending from the Southern Appennines to the Dinarids chain, to the Australpine and to Hungary too. Margin-to-slope facies are known from the Norian, facing both intraplatform basins and open pelagic areas. However, data about the Upper Carnian start-up stage are limited to the northeastern Friuli province, and less is known on the early depositional system. In order to increase knowledge on first evolutionary stages, the Julian- Tuvalian succession has been investigated by studying several geological sections spread in the eastern Southern Alps, from the eastern Cadore region up to northwestern Slovenia. Multi-disciplinary examinations have been carried on, involving macro- and micro-facies analysis, sequence- stratigraphy, biostratigraphy and geochemistry (whenever possible). Like in many sectors ...
In the Dolomites region, Middle Triassic tectonics was associated with fast subsidence rates and ... more In the Dolomites region, Middle Triassic tectonics was associated with fast subsidence rates and a Late Ladinian magmatic event that induced epicrustal intrusions (Monzoni, Predazzo, Cima Pape) and a significant shoshonitic-basaltic volcanism. Contrasting scenarios (from transpressional/transtensional tectonics to subduction backarc extension) were proposed to explain these tectonics and magmatism (Lustrino et al., 2019 and reference therein). In order to contribute to unravel of this issue, we built subsidence curves and maps for different Triassic periods, based on cross sections and well data. In particular, we analysed the thicknesses of four Triassic carbonate systems (represented by Contrin Fm., Sciliar Fm., Cassian Dolomite and Heiligkreuz Fm.) in 21 areas spread on the central-eastern Southern Alps. Subsidence calculations, covering a time span of about 12 Ma (from Illyrian to Tuvalian), provided us the opportunity to quantify local and regional subsidence rates, and to cons...
Tectonic activity in the Mediterranean area (involving migrations of old orogenic belts, formatio... more Tectonic activity in the Mediterranean area (involving migrations of old orogenic belts, formation of basins and building of orogenic systems) has been determined by the convergence of the confining plates (Nubia, Arabia and Eurasia). Such convergence has been mainly accommodated by the consumption of oceanic and thinned continental domains, triggered by the lateral escapes of orogenic wedges. Here, we argue that the implications of the above basic concepts can allow plausible explanations for the very complex time-space distribution of tectonic processes in the study area, with particular regard to the development of Trench-Arc-Back Arc systems. In the late Oligocene and lower–middle Miocene, the consumption of the eastern Alpine Tethys oceanic domain was caused by the eastward to SE ward migration/bending of the Alpine–Iberian belt, driven by the Nubia–Eurasia convergence. The crustal stretching that developed in the wake of that migrating Arc led to formation of the Balearic basi...
The Yanchang Formation was deposited during the Middle Triassic in a vast lacustrine basin in the... more The Yanchang Formation was deposited during the Middle Triassic in a vast lacustrine basin in the modern Ordos Basin and is a main target for hydrocarbon exploration in Central China. It is divided, based on sedimentary cycles and lithology, into the Chang 10 (the oldest) to Chang 1 (the youngest) members. During the deposition of the Chang 7 Member, the Ordos lake system reached its maximum depth and large volumes of organic-rich sediments were deposited. The evolution of the Ordos Basin sedimentary system during this phase is, however, not completely understood, and uncertainty still exists as for the chronostratigraphy of Chang 7 Member. We acquired palynological markers and palynofacies and a high-resolution δ13Corg record through the entire Chang 7 Member, and a ID-TIMS 206Pb/238U date of 240.95 ± 0.033 Ma from a volcanic ash bed in the middle of this Member. These imply that the maximum deepening phase of the lacustrine system was during the earliest Ladinian. Evidence of marine influence in the Ordos Basin at that time and comparison to the sea-level oscillations observed in Western Tethys suggest that a global eustatic rise and highstand may have played a role in determining lake-level variations
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