XIII.—Liguria Nappe: Northern Apennines

1963 ◽  
Vol 65 (13) ◽  
pp. 315-333 ◽  
Author(s):  
E. B. Bailey ◽  
W. J. McCallien
Keyword(s):  
Middle Miocene ◽  
Northern Apennines ◽  
Geological Survey ◽  
Structural Units

SynopsisWe undertake a re-interpretation of eighteen sheets of the 1: 100,000 Geological Survey map of Italy. Developing the tectonic discoveries of G. Steinmann and S. Lencewicz we group the pre-Middle Miocene rocks of the district in four structural units beginning with the lowest as follows: (1) The rocks seen through the Carrara Window; (2) Spezia Nappe; (3) Liguria Nappe; (4) Genoa Nappe. Our account mainly concerns the Liguria Nappe. In it we find too much layering to admit of G. I. Migliorini's invocation of successive piecemeal landslips. We also cannot agree with certain important features of R. Staub's synthesis of Mediterranean tectonics.

Late evolution of the inner Northern Apennines from the structure of the Monti del Chianti-Monte Cetona Ridge (Tuscany, Italy)

2021 ◽  
Author(s):  
Andrea Brogi
Keyword(s):  
Middle Miocene ◽  
Sedimentary Basins ◽  
Northern Apennines ◽  
Normal Faults ◽  
Tyrrhenian Sea ◽  
Scientific Debate ◽  
Marine Deposits ◽  
Accommodation Space ◽  
Tectonic Events ◽  
Late Evolution

<p>The Neogene and Quaternary tectonic evolution of the inner Northern Apennines (i.e southern Tuscany and northern Tyrrhenian Sea), as well as its crustal features (i.e. low crustal thickness, Neogene-Quaternary magmatism, widespread geothermal anomalies, lateral segmentation of the stacked tectonic units, extensive deep sedimentary basins), are framed in different geodynamic scenarios: compressional, extensional or both, pulsing. Consequently, the basin and range structure that characterises the northern Tyrrhenian Sea and southern Tuscany is considered as a consequence of (i) out-of-sequence thrusts and related thrust-top-basins, (ii) polyphased normal faulting that formed horst and graben structures or (iii) a combination of both. This paper provides a new dataset from a sector of the eastern inner Northern Apennines (i.e. Monti del Chianti - Monte Cetona ridge) contributing to this scientific debate. New fieldwork and structural analysis carried out in selected areas along the ridge allowed to define the chronology of the main tectonic events on the basis of their influence on the marine and continental sedimentation. The dataset supports for early Miocene - (?) Serravallian in-sequence and out-of-sequence thrusting. Thrusting produced complex staking patterns of Tuscan and Ligurian Units. Extensional detachments developed since later middle Miocene and controlled the Neogene sedimentation in bowl-shaped structural depressions, later dissected by normal faults enhancing the accommodation space for Pliocene marine deposits in broad NNW-trending basins (Siena-Radicofani and Valdichiana Basins). In this perspective, no data supports for active, continuous or pulsing, compressional tectonics after late Serravalian. As a result, in the whole inland inner Northern Apennines the extensional tectonics was continuously active at least since middle Miocene and controlled the basins development, magmatism and structure of the crust and lithosphere.</p>

scholarly journals New paleomagnetic results for Tertiary magmatic rocks of Fruska Gora, Serbia

2012 ◽  
pp. 99-108 ◽  
Author(s):  
Vesna Cvetkov ◽  
Vesna Lesic ◽  
Nada Vaskovic
Keyword(s):  
Large Scale ◽  
Middle Miocene ◽  
Pannonian Basin ◽  
Clockwise Rotation ◽  
Structural Units ◽  
Magmatic Rocks ◽  
Neogene Sediments ◽  
The Subject ◽  
Short Time ◽  
Paleomagnetic Direction

Fruska Gora Mountain is a large scale antiform located at the southeast part of the Pannonian Basin between the Danube and Sava Rivers. It is built of Paleozoic and Mesozoic rocks with Neogene sediments on all sides and at the flanks. The Paleozoic and Mesozoic rocks are largely metamorphosed (age of the metamorphism is early Cretaceous) and they are intruded by Eocene/Oligocene latites and rhyodacites and Badenian basaltic trachyandesite. On Fruska Gora two major structural units are observed, the northern and southern structural units which are divided by the Srem dislocation striking NNW-SSE. The Tertiary magmatic rocks located on both sides of this dislocation were the subject of paleomagnetic analysis. Tectonically meaningful paleomagnetic directions are obtained from latites and rhyodacites, while basaltic trachyandesite has a secondary remanent magnetization. The obtained overall-mean paleomagnetic direction, after applying the correction for the general tilt of the Lower Miocene sediments, suggests a clockwise rotation (D = 210?, I = -45?, k = 21, ?95 = 14?) of 30? with respect to the present North of blocks on both sides of the Srem dislocation. The fact that close to the end of Miocene-Early Pliocene Fruska Gora rotated in a counterclockwise direction for 40? with respect to the present North means that all of Fruska Gora rotated in a clockwise direction for 70? with the respect to the present North in a short time after the intrusion of Eocene/Oligocene magmatic rocks and before Middle Miocene.

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