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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
Hovakimyan, Samvel
Moritz, Robert
Rezeau, Hervé
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 Porphyry — Epithermal — Structural control — Tectonic control — Lesser Caucasus — Tethyan orogenic belt
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Structures
Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre
Research group Mineral Resources and Geofluids
Projects FNS: 200020-138130, 200020-155928 and 200020-168996
FNS: SCOPES IB7620-118901 and IZ73Z0-128324
Citation
(ISO format) 		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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