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Article
Author(s)
Vladimir I. Gugushvili
Full-Text PDF XML 681 Views
DOI:10.17265/2162-5298/2019.06.004
Affiliation(s)
Department of Metallogeny, Al. Janelidze Institute of Geology. Iv. Javakhishvili Tbilisi State University, Jikia 16 Tbilisi 0186, Georgia
ABSTRACT
The geodynamic development of Eurasian active margin is related to
subduction, collision and closure of Tethys Ocean. It is divided on
pre-collision and post-collision stages. The pre-collision development
controlled by subduction, whereas post-collision related by orogenesis,
granodiorite magmatism gold base and trace metals (Sb,W, Mo and Hg)
metallogeny. The mentioned trace metals association is the geochemical
indicator of first stage of post-collision development. The second stage
revealed in andesite basalt, shoshonite, olivine basalt and tholeiite volcanic
activity. Pre-collision stage is controlled by steady state subduction related
with metamorphism and calc-alkaline volcanic activity in subaqual and island
conditions of island arc setting. It is lately with steepening of subducting
slab and incursion of mantle diapir transferred in interarc-backarc and minor
ocean setting with shoshonite-trachyandesite and alkali olivine basalt and
tholeiite volcanism and later with ophiolite volcanism, dunite-peridotite
magmatism and Cu-pyrite mineralization of minor ocean setting. The
pre-collision stage is developed temporally and spacially along dipping of
subducted slab in the island arc setting transferring in the backarc-interarc
and minor ocean settings. The similar transferring occurs laterally to dipping
of slab and ascending succession. The alternation of settings shown the cycling
along dipping spatial and temporal alternation of island arc, backarc and minor
ocean settings. Laterally to dipping alternation is only spatial, whereas in
ascending succession cycling is only temporal, localized spacially. The pre-collision
development occurs in subaqual condition, whereas related to orogenesis
post-collision development is mainly subaerial.
KEYWORDS
Phanerozoic geodynamics, Tethys Ocean, Eurasian active margin, metallogeny.
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