L'Oligo-Miocene ligure; un exemple de transgression

Lorenz, C.

doi:10.2113/gssgfbull.s7-xxi.4.375

Cited by 8 publications

(10 citation statements)

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“…According to most authors, transgression progressed from N-NE to S-SW (Lorenz 1984;Lorenz 1979), and it reached the southwesternmost sector of the basin only in the Chattian (Fravega et al 1994;Vannucci et al 1997). This is why the Molare Formation is dated as Early Oligocene in eastern sectors, whereas it is dated as Late Oligocene in western sectors.…”

Section: The Tertiary Piedmont Basinmentioning

confidence: 99%

Provenance of Oligocene synorogenic sediments of the Ligurian Alps (NW Italy): inferences on belt age and cooling history

Barbieri

Carrapa

Giulio

et al. 2003

International Journal of Earth Sciences

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Mineral chemistry,40 Ar/ 39 Ar geochronology on white micas and Apatite Fission Track Thermochronology (AFTT), are applied here to study the provenance of the synorogenic Molare Formation (lowermost unit of the Tertiary Piedmont Basin clastic sequence). The Molare Formation was deposited during transgression onto the Ligurian Alps nappe stack in the Early Oligocene. Depositional facies show that clastic distribution remained transversal, with local sources located just landward from the coastline. Phengite mineral chemistry together with 40 Ar/ 39 Ar data clearly shows two distinctive source areas, each one mirroring the composition of the basement directly beneath the clastic sequence. Amphibole mineral chemistry allows second order provenance distinctions within each sector, reflecting heterogeneous metamorphic evolution of the bedrock complexes. Integrated 40 Ar/ 39 Ar dating and AFTT suggest that, following a fast cooling/exhumation episode of the Ligurian Alps during the Oligocene, very little net uplift has since occurred. This is due to a period of general subsidence from the Oligocene-Late Miocene followed by comparable uplift from Late Miocene-Pliocene to the present. In general our data provide an image of the Ligurian Alps during the Oligocene, which is very similar to the present-day one.

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Section: The Tertiary Piedmont Basinmentioning

confidence: 99%

Provenance of Oligocene synorogenic sediments of the Ligurian Alps (NW Italy): inferences on belt age and cooling history

Barbieri

Carrapa

Giulio

et al. 2003

International Journal of Earth Sciences

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“…During the Late Eocene-Early Oligocene, a prograding marine transgression, probably coming from the north-NE (Lorenz 1979;Lorenz 1984;Gelati & Gnaccolini 1988), followed by a progressive deepening of the basin floor, took place in the TPB. As a result, alluvial and nearshore sediments were deposited (i.e.…”

Section: Sedimentological and Structural Evolutionmentioning

confidence: 99%

“…As a result, alluvial and nearshore sediments were deposited (i.e. the Molare Formation) (Lorenz 1979;Lorenz 1984;Gelati et al 1993;Gelati & Gnaccolini 1996;Gelati & Gnaccolini 1998). Sediments of the Molare Formation show a clear source in the southern sector (present day Ligurian Alps and Voltri Group) (Gelati & Gnaccolini 1982).…”

Section: Sedimentological and Structural Evolutionmentioning

confidence: 99%

Subsidence, stress regime and rotation(s) of a tectonically active sedimentary basin within the western Alpine Orogen: the Tertiary Piedmont Basin (Alpine domain, NW Italy)

Carrapa

Bertotti

Krijgsman

2003

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The Oligocene to Miocene Tertiary Piedmont Basin (TPB) is located in the NW part of Italy at the junction between the Apennine and the Alpine thrust belts. The position of the TPB on top of the Alpine/Apennine Orogen poses fundamental questions as to the tectonics of the basin subsidence. Having undergone little deformation, the TPB sediments provide an insight into the stress regime and rotations in the kinematically very complex area surrounding the basin itself. In this study we integrate subsidence and structural analysis with measurements of magnetic susceptibility anisotropy (AMS) and natural remanent magnetization (NRM) in order to better constrain the tectonic kinematics of the basin evolution. A major important period of subsidence occurred in the Middle Miocene involving the whole basin. During this period the TPB experienced NE-SW-directed compression and limited shortening. Some NW-SE-directed compressional features have been identified and they were probably active during post Tortonian times. Structures associated with north-south tension are quite common, but the amount of strain that they accommodate is minor. In addition this research provides new preliminary data suggesting counterclockwise rotation in the TPB by c. 20° which has taken place during Middle Miocene time.

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“…In the southern part of this basin, i.e. 50 km around Cassinelle, the subsidence started in the early Oligocene and caused a transgression, which progressed from N-NE to S-SW (Lorenz 1979), reaching the south westernmost sector of the basin only in the Chattian (Vannucci et al 1997). The first result of such a transgression was the deposition of the coarse-grained, continental to shallow-water marine deposits of the Molare Formation, which accordingly is dated as early Oligocene in the eastern sectors, and as late Oligocene in the western sectors (Barbieri et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…In general Lorenz (1969: 434) described in the Cassinelle area a vertical succession of facies from continental to brackish to shallow marine, and the ferns outcrop may expose either continental or brackish layers. Lorenz (1979) reconstructed the environment for the late Oligocene as an emerged area to the south of the Cassinelle locality, and a marine basin to the north. Along the ancient coastline a few small continental basins were formed (e.g.…”

Section: Introductionmentioning

confidence: 99%

Foliage accumulations of Osmunda lignitum (osmundaceae) in the Oligocene of northern Italy and western Germany

Kvaček¹,

Martinetto²

2016

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Accumulations of Osmunda (Plenasium) lignitum (Giebel) Stur fern foliage have been recently recovered in the Oligocene deposits of northern Italy at Cassinelle and western Germany at Niederpleis-1 (Sankt Augustin; Winterscheid 2006). They morphologically match other European records distributed from the Eocene to the Oligocene (– early Miocene). Material from both sites represents sterile pinnae compressions with preserved leaf anatomy. The data obtained on leaf cuticles correspond to most of the previous findings from Germany (Geiseltal, Seifhennersdorf, Haselbach) but cast doubts on some others based on dispersed cuticles (e.g. Zülpich). Comparison with living species of Osmunda (Plenasium) from east and south-east Asia revealed only minor differences in the epidermal structure and stress the close relationship with Osmunda banksiifolia (C. Presl) Kuhn distributed along valley streams from China, Japan to Indonesia, New Guinea and Philippines.

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L'Oligo-Miocene ligure; un exemple de transgression

Cited by 8 publications

References 0 publications

Provenance of Oligocene synorogenic sediments of the Ligurian Alps (NW Italy): inferences on belt age and cooling history

Provenance of Oligocene synorogenic sediments of the Ligurian Alps (NW Italy): inferences on belt age and cooling history

Subsidence, stress regime and rotation(s) of a tectonically active sedimentary basin within the western Alpine Orogen: the Tertiary Piedmont Basin (Alpine domain, NW Italy)

Foliage accumulations of Osmunda lignitum (osmundaceae) in the Oligocene of northern Italy and western Germany

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