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MANTLE PERIDOTITE XENOLITHS IN ALKALI BASALTS FROM THE EAST THRACE REGION (NW TURKEY)

In: Geologica Carpathica, vol. 56, no. 4
Fahri Esenli - S. Can Genc

Details:

Year, pages: 2005, 359 - 368
About article:
This paper represents the first report on the peridotitic mantle xenoliths including spinel harzburgites and spinel lherzolites found in the Late Miocene-Pliocene basaltic rocks (Thracean alkaline basalts — TAB) of the Thrace region, northwestern Turkey. The lavas formed and extruded during the north-south extension of western Anatolia, are olivine basalts and basanites displaying within-plate affinity. The estimated modal mineralogy of the peridotite xenoliths is olivine (58–84 %) + orthopyroxene (12–35 %) + clinopyroxene (0–12 %) + spinel (1–5 %). They are characterized mainly by protogranular and also transitional protogranular to porphyroclastic and fine-grained equigranular textures. Melt pockets are recognized in only one sample. Deformation features in olivine and pyroxenes are zoning, twinning, including inclusions, kink banding, triple junction and undulatory extinction. Bulk-rock analyses indicate that the xenoliths are depleted in basaltic components (e.g. CaO — 0.39–1.50 wt. %, Al2O3 — 0.80–1.78 wt. %). Light rare-earth element (LREE) enrichment is significant (e.g. Lan 2–6), which suggests a cryptic metasomatic history.
How to cite:
ISO 690:
Esenli, F., Can Genc, S. 2005. MANTLE PERIDOTITE XENOLITHS IN ALKALI BASALTS FROM THE EAST THRACE REGION (NW TURKEY). In Geologica Carpathica, vol. 56, no.4, pp. 359-368. 1335-0552.

APA:
Esenli, F., Can Genc, S. (2005). MANTLE PERIDOTITE XENOLITHS IN ALKALI BASALTS FROM THE EAST THRACE REGION (NW TURKEY). Geologica Carpathica, 56(4), 359-368. 1335-0552.