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Title: Structure and dynamics of the Tyrrhenian basin

The Tyrrhenian Sea is a recently subsided oceanic basin. Young tholeiitic volcanoes are found in the central part of this sea as well as sea mount fragments of continental blocks formed by Alpine folding complexes. Mesozoic ophiolites are found on Baronie and DeMarchi sea mounts and Site 651 (Leg 107). Soviet investigations show that Baronie serpentinites are covered by thick carbonate rocks of Late Jurassic age, and these deposits are comparable with ophicalcites of the Ligurian Alps. The ophiolites are traced across the basin indicating the connection to north Corsican and Calabrian structures. The fracture zone of 41{degree}N is possibly the fault which controls microplate displacement. Rifting occurred quickly and migrated toward the Eolian arc. There is no direct evidence of regular spreading (linear magnetic anomalies) in the Tyrrhenian Sea now, and opening rate calculations are difficult. Detailed heat-flow data, similar to data of typical spreading centers, allow them to estimate the gradient of the thinning lithosphere outside to axis volcanoes (Vavilov and Marsili). The calculated rifting rate on this basis is about 1-2 cm/year relative to each stretching center. The Tyrrhenian Sea has developed as a back-arc basin within the collision zone of thick continental plates.
Authors:
; ;  [1]
  1. (Institute of Oceanology, Moscow (USSR))
Publication Date:
OSTI Identifier:
5537288
Report Number(s):
CONF-8809346--
Journal ID: ISSN 0149-1423; CODEN: AABUD
Resource Type:
Conference
Resource Relation:
Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA); Journal Volume: 72:8; Conference: Mediterranean Basins conference and exhibition, Nice (France), 25-28 Sep 1988
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; USSR; GEOLOGIC SURVEYS; GEOLOGIC FAULTS; JURASSIC PERIOD; RIFT ZONES; SEDIMENTARY BASINS; TECTONICS; VOLCANOES; ASIA; EASTERN EUROPE; EUROPE; GEOLOGIC AGES; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; MESOZOIC ERA; SURVEYS 020200* -- Petroleum-- Reserves, Geology, & Exploration