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| Titel |
The Solarya Volcano-Plutonic Complex (NW Turkey): Petrography, Petrogenesis and Tectonic Implications |
| VerfasserIn |
Alp Ünal, Omer Kamaci, Safak Altunkaynak |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093909
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| Publikation (Nr.) |
 EGU/EGU2014-9096.pdf |
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| Zusammenfassung |
| The post collisional magmatic activity produced several volcano-plutonic complexes in NW
Anatolia (Turkey) during the late Oligocene- Middle Miocene. One of the major
volcano-plutonic complexes, the Solarya volcano-plutonic complex is remarkable for its
coeval and cogenetic plutonic (Solarya pluton), hypabysal and volcanic rocks of Early
Miocene (24-21 Ma) age. Solarya pluton is an epizonal pluton which discordantly intruded
into metamorphic and nonmetamorphic basement rocks of Triassic age. It is a N-S
trending magmatic body covering an area of 220 km2,approximatelly 20 km in length
and 10 km in width. Based on the field and petrographic studies, three main rock
groups distinguished in Solarya pluton; K-feldspar megacrystalline granodiorite,
microgranite-granodiorite and haplogranite. Porphyritic and graphic-granophyric textures are
common in these three rock groups. Pluton contains magmatic enclaves and syn-plutonic
dykes of dioritic composition. Hypabyssal rocks are represented by porphyritic
microdiorite and porphyritic quartz-diorite. They form porphyry plugs, sheet inrusions
and dykes around the pluton. Porphyrites have microcrystalline-cryptocrystalline
groundmass displaying micrographic and granophyric textures. Petrographically
similar to the hypabyssal rocks, volcanic rocks are formed from andesitic and dasitic
lavas and pyroclastic rocks. Plutonic, hypabyssal and volcanic rocks of Solarya
volcano-plutonic complex show similar major-trace element and Sr-Nd-Pb isotopic
compositions, indicating common magmatic evolution and multicomponent melt
sources including mantle and crustal components. They are mainly metaluminous,
medium to high-K calc alkaline rocks and display enrichment in LILE and depletion
in Nb, Ta, P and Ti. They have initial 87Sr/86Sr values of 0.70701- 0.70818 and
143Nd/144Nd values of 0.51241-0.51250. These geochemical characteristics and isotopic
signatures are considered to reflect the composition of the magmas derived from a
metasomatized lithospheric mantle beneath NW Anatolia and from the overlying crust.
Compositional variations in Solarya volcano-plutonic complex are interpreted as a result of
AFC.
Convective removal or partial delamination of the base of mantle lithosphere and
asthenospheric upwelling can be considered as possible mechanisms to provide melting of
subcontinental lithospheric mantle metasomatized by earlier subduction, resulting
in post collisional magmatic activity in NW Anatolia and the adjacent regions. |
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