Publication Date:
2021-06-07
Description:
The southern Apennine belt is formed by nappes that have
undergone large (i. e. hundreds of kms) horizontal displacements. In
such tectonic scenario, orogenic rotations of nappes are clearly
expected, and paleomagnetism may represent a key tool to constrain
displacements and understand the pre-orogenic paleogeography.
Recent paleomagnetic data have shown that the Apenninic carbonate
platform, on top of the nappe pile, has rotated ~80° counterclockwise
(CCW) after Langhian times. A similar rotation may be
inferred for the Lagonegro basinal unit. Numerous data from the
Plio-Pleistocene sediments unconformably overlying these two units
reveal a 0°-40° (20° on average) CCW rotation since early Pliocene.
Data from the exposed Apulian swell, and from other parts of the
Adriatic plate, suggest that the buried Apulian platform has not
undergone a significant rotation. Therefore the overall paleomagnetic/
geological data suggest that during mid-late Miocene the Apenninic
platform and Lagonegro unit were detached from basement,
underwent internal imbrication associated with a 60° CCW rotation.
During early-mid Pliocene, this wedge was carried over the Apulian
carbonates (which were in turn internally stacked in late Plioceneearly
Pleistocene times), and underwent a final 20° CCW rotation.
The paleomagnetic data also prove that the southeastward drift of
Calabrian block (and synchronous spreading of the southern
Tyrrhenian Sea) induced oroclinal deformation of the southern
Apennines and Sicily, which underwent similar-magnitude (but
opposite in sign) orogenic rotations. Relying on such rotational pattern,
we propose a paleogeographic reconstruction for late Langhian
(and older) times characterized by the presence of a NNE-oriented
narrow carbonate platform corridor separating the Ionian and Liguro-
Piedmont oceans.
Description:
Published
Description:
39-46
Description:
3.4. Geomagnetismo
Description:
JCR Journal
Description:
reserved
Keywords:
Paleomagnetism
;
orogenic rotations southern Apennines
;
southern Tyrrhenian Sea
;
paleogeography
;
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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