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Title

Structural control and tectonic environment of the Cenozoic giant Kadjaran porphyry Cu-Mo and epithermal system, southern Armenia, Lesser Caucasus

Authors
Harutunyan, Marianna
Hovhannisyan, Arshavir
Melkonyan, Rafael
Tayan, Rodrik
Iskandaryan, Gevorg
Published in Proceedings of the 15th SGA Biennial Meeting. Glasgow, Scotland - 27-30 August 2019 - . 2019, p. 943-946
Abstract In this contribution, we focus on the Oligocene to Miocene structural evolution of the giant Kadjaran porphyry Cu-Mo deposit and its epithermal overprint. This evolution was controlled by long-lived regional faults during the Cenozoic tectonic and magmatic evolution of the Meghri-Ordubad composite pluton located in the southernmost Lesser Caucasus. We discuss the ore-bearing fracture network characteristics related with the deposit-scale ore-controlling structures in the frame of regional strike-slip faults. Stereonets summarizing the orientations of different generations of mineralized veins allow us to constrain the favorable fracture network environment for ore-formation at the giant Kadjaran deposit. During the middle - late Oligocene, NNE-oriented shortening created the major ~N-S- and NE-oriented steeply dipping ore-controlling deposit-scale faults under dextral strike-slip tectonics. The gently to moderately dipping NE-, ~N-S- and ~E-W-oriented fracture networks along the steeply dipping deposit-scale faults were the most important structural control for the emplacement of the main porphyry stockwork mineralization. These deposit-scale ore-controlling faults were reactivated during the early Miocene under WNW-oriented shortening and NNE-oriented extension. The progressive anticlockwise rotation of paleostress orientations from middle - late Oligocene to early Miocene was linked to re-organization of tectonic plates during Arabia-Eurasia collision.
Keywords PorphyryEpithermalStructural controlTectonic controlLesser CaucasusTethyan orogenic belt
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Structures
Research group Mineral Resources and Geofluids
Projects FNS: 200020-138130, 200020-155928 and 200020-168996
FNS: SCOPES IB7620-118901 and IZ73Z0-128324
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HOVAKIMYAN, Samvel et al. Structural control and tectonic environment of the Cenozoic giant Kadjaran porphyry Cu-Mo and epithermal system, southern Armenia, Lesser Caucasus. In: Proceedings of the 15th SGA Biennial Meeting. Glasgow, Scotland. [s.l.] : [s.n.], 2019. p. 943-946. https://archive-ouverte.unige.ch/unige:122756

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Deposited on : 2019-09-06

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