PETROGENESIS OF THE LATE CENOZOIC COLLISION VOLCANISM IN THE CENTRAL PART OF THE LESSER CAUCASUS (Azerbaijan)
N.A. Imamverdiyev1, M.Ya. Gasangulieva2, G.D. Babaeva2, Sh.F. Abdullaeva1, A.A. Veliev3
1Baku State University, Azerbaijan, Academic Zahid Khalilov str. 23, Baku, AZ-1073/1, AZ 1148, Republic of Azerbaijan
2Institute of Geology and Geophysics, Azerbaijan National Academy of Sciences, H. Javid Av. 119, Baku, AZ 1143, Azerbaijan
3Azerbaijan International Mining Company, Hanifa Aleskerov str. 16, Nasimi, Baku, AZ 1022, Azerbaijan
Keywords: Petrogenesis, collision volcanism, Lesser Caucasus
Abstract
The Late Cenozoic volcanic deposits of the Lesser Caucasus have similar trace-element and REE patterns with negative anomalies of Nb, Ta, Hf, and Zr. They are highly enriched in Rb, Ba, Th, and La and depleted in Ti, Yb, and Y with respect to N-MORB, which indicates their formation from the subduction-metasomatized lithospheric mantle. Partial melting of the subcontinental mantle lithosphere and crustal assimilation and fractional crystallization controlled the magma evolution in the collisional magmatic belts.
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