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Episodic Mesozoic to Tertiary ore-forming events in successive geodynamic settings in an accretionary orogenic belt: the case of the Tethys orogenic belt

English title Episodic Mesozoic to Tertiary ore-forming events in successive geodynamic settings in an accretionary orogenic belt: the case of the Tethys orogenic belt
Applicant Moritz Robert
Number 155928
Funding scheme Project funding
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Other disciplines of Earth Sciences
Start/End 01.11.2014 - 31.10.2016
Approved amount 149'646.00
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All Disciplines (5)

Discipline
Other disciplines of Earth Sciences
Mineralogy
Geochronology
Geochemistry
Geology

Keywords (7)

Lesser Caucasus; Eastern Pontides; Ore deposits; Magmatic rocks; Geodynamics; Tectono-magmatic setting; Menderes Massif

Lay Summary (French)

Lead
La ceinture orogénique de la Téthys est une zone exceptionnelle pour étudier les relations entre différents environnements géodynamiques, la formation épisodique de gisements métallifères de la croûte terrestre, circulations de fluides et magmatisme. La chaîne de la Téthys est le résultat de la convergence progressive, puis de la collision des plaques eurasienne, africaine et arabe.
Lay summary

Contenu et objectifs du travail de recherche

Dans un premier sous-projet, l’étude du pluton de Meghri-Ordubad du Petit-Caucase septentrional permet de comprendre l’exceptionnelle évolution métallogénique et enrichissement métallique d’un petit segment de la marge eurasienne durant le Tertiaire, depuis la construction d’un arc magmatique dans un contexte de subduction à une extension post-orogénique, en passant par la collision entre les plaques eurasienne et arabe. Un second sous-projet examine l’évolution crétacée et tertiaire des Pontides orientales et du Petit-Caucase septentrional pour tenter d’élucider les associations spatiales paradoxales de gisements liés à des processus sous-marins et des processus subaériens. Un troisième sous-projet cherche à comprendre le lien existant entre gisements métallifères, extension de la croûte terrestre, circulations de fluides hydrothermaux et magmatisme durant le démantèlement tardif d’une chaîne orogénique dans la région égéenne et l’Anatolie occidentale, une des zones d’extension tectonique des plus actives de notre planète.

Contexte scientifique et sociétal du projet

Ce projet permettra aux compagnies minières et d’exploration minérale et aux services gouvernementaux d’améliorer leurs connaissances au sujet des ressources minérales du sous-sol, notamment des métaux critiques nécessaires à notre société, tels que Sb, Re, Mo, Te, Au et Cu.
Direct link to Lay Summary Last update: 22.10.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Incremental Growth of Mid- to Upper-Crustal Magma Bodies During Arabia–Eurasia Convergence and Collision: A Petrological Study of the Calc-Alkaline to Shoshonitic Meghri–Ordubad Pluton (Southern Armenia and Nakhitchevan, Lesser Caucasus)
Rezeau Hervé, Leuthold Julien, Tayan Rodrik, Hovakimyan Samvel, Ulianov Alexey, Kouzmanov Kalin, Moritz Robert (2018), Incremental Growth of Mid- to Upper-Crustal Magma Bodies During Arabia–Eurasia Convergence and Collision: A Petrological Study of the Calc-Alkaline to Shoshonitic Meghri–Ordubad Pluton (Southern Armenia and Nakhitchevan, Lesser Caucasus), in Journal of Petrology, 59(5), 931-966.
30 Myr of Cenozoic magmatism along the Tethyan margin during Arabia–Eurasia accretionary orogenesis (Meghri–Ordubad pluton, southernmost Lesser Caucasus)
Rezeau Hervé, Moritz Robert, Leuthold Julien, Hovakimyan Samvel, Tayan Rodrik, Chiaradia Massimo (2017), 30 Myr of Cenozoic magmatism along the Tethyan margin during Arabia–Eurasia accretionary orogenesis (Meghri–Ordubad pluton, southernmost Lesser Caucasus), in Lithos, 288-289, 108-124.
Post-collisional magmatism and ore-forming systems in the Menderes Massif : new constraints from the Miocene porphyry Mo-Cu Pınarbaşı system, Gediz-Kütahya, Western Turkey.
Delibas O. Moritz R. Chiaradia M. Selby D. Ulianov & Revan M.K. (2017), Post-collisional magmatism and ore-forming systems in the Menderes Massif : new constraints from the Miocene porphyry Mo-Cu Pınarbaşı system, Gediz-Kütahya, Western Turkey., in Mineralium Deposita., 52, 1157-1178.
Cretaceous subduction-related magmatism and associated porphyry-type Cu-Mo mineralizations in the Eastern Pontides, Turkey: New constraints from geochronology and geochemistry. Lithos,
Delibas O. Moritz R. Ulianov Chiaradia M. Saraç C. Revan K. & Göç D. (2016), Cretaceous subduction-related magmatism and associated porphyry-type Cu-Mo mineralizations in the Eastern Pontides, Turkey: New constraints from geochronology and geochemistry. Lithos,, in Lithos, 248-251, 119-137.
Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan.
Moritz R. Rezeau H. Ovtcharova M. Tayan R. Melkonyan R. Hovakimyan S. Ramazanov V. Sel (2016), Long-lived, stationary magmatism and pulsed porphyry systems during Tethyan subduction to post-collision evolution in the southernmost Lesser Caucasus, Armenia and Nakhitchevan., in Gondwana Research, 37, 465-503.
Metallogeny of the Lesser Caucasus: From arc construction to post-collision evolution.
Moritz R. Melkonyan R. Selby D. Popkhadze N. Gugushvili V. Tayan R. & Ramazanov V. (2016), Metallogeny of the Lesser Caucasus: From arc construction to post-collision evolution., in Special Publication of the Society of Economic Geology, 19, 157-192.
Temporal and genetic link between incremental pluton assembly and pulsed porphyry Cu-Mo formation in accretionary orogens
Rezeau H. Moritz R. Wotzlaw J.-F. Tayan R. Melkonyan R. Ulianov A. Selby D. d’Abzaz F (2016), Temporal and genetic link between incremental pluton assembly and pulsed porphyry Cu-Mo formation in accretionary orogens, in Geology, 44, 627-630.

Collaboration

Group / person Country
Types of collaboration
Durham University, Great Britain Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
National Academy of Sciences of the Republic of Armenia, Yerevan Armenia (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
MTA Ankara, Turkey Turkey (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Baku State University, Azerbaijan Aserbaijan (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Geological Survey of Iran Iran (Asia)
- in-depth/constructive exchanges on approaches, methods or results
ETH-Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
University of Athens, Greece Greece (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
St Kliment Ohridski Sofia University Bulgaria (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Al. Djalenidze Insitute of Geology, Tbilisi Georgia (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Awards

Title Year
Prize for the best student talk at the Society of Economic Geology 2016 Conference on the Tethyan Tectonics and Metallogeny, Cesme, Turkey, September 25-28, 2016. This is a special and prestigious award given during a conference attended by both academia delegates and members from the exploration and mining community. This is a meeting with a real interface between research activities and practical application for the needs of society. 2016

Associated projects

Number Title Start Funding scheme
101853 Diversity of gold deposits in the Tethyan belt of southeastern Europe: markers of discrete tectonic and/or magmatic events 01.10.2003 Project funding
168996 Metallogeny of the Lesser Caucasus: From arc construction to post-collision evolution 01.11.2016 Project funding
188714 The Tethys metallogenic belt: A natural laboratory for understanding ore-forming processes from arc construction to post-collision evolution in orogenic belts 01.11.2019 Project funding
138130 Episodic Mesozoic to Tertiary ore-forming events along the Lesser Caucasus and adjoining tectonic provinces 01.11.2011 Project funding
59041 Ore deposits within their geodynamic environment: The case of the Panagyurishte district, Srednogorie belt, and the eastern Rhodopes (Bulgaria and Greece) 01.09.2000 Project funding
121510 Contrasting Cretaceous-Tertiary gold and copper ore formation along the Tethyan arc (Serbia-Bulgaria-Greece-Georgia-Armenia) 01.11.2008 Project funding
128324 Metallogeny of the Lesser Caucasus (Georgia, Armenia and Azerbaijan) 01.12.2009 SCOPES
133781 Near-infrared equipment for high-precision microthermometry measurements using the infrared microscopy technique 01.12.2010 R'EQUIP
113510 Diversity of gold deposits in the Tethyan belt of southeastern Europe: markers of discrete tectonic and/or magmatic events 01.10.2006 Project funding

Abstract

The Tethys orogenic belt is an exceptional environment to investigate the relationship among different geodynamic settings, metal-enrichment in the Earth’s crust, fluid migration and magmatism. This project is focused on the Aegean, Turkish and Lesser Caucasian segments of the Tethys belt, which is the product of convergence and final collision of the Eurasian, Arabian and African plates. The Tethys orogenic belt combines an evolution ranging from Jurassic-Cretaceous subduction environments, followed by different collisional to post-orogenic, extensional tectono-magmatic events. Ore formation was episodic, accompanying particular tectonic and/or magmatic events. This project examines the interplay of various geodynamic settings and ore-formation processes in three different regions characteristic of the evolution of the Tethys orogenic belt: (1) the Jurassic to Tertiary Eurasian margin including the Lesser Caucasus and the Eastern Pontides; (2) the Tertiary Meghri-Ordubad pluton of the southernmost Lesser Caucasus; and (3) post-orogenic settings in the Aegean region. This research project is a continuation of several Swiss National Science Foundation projects studying the diverse geodynamic environments of ore deposits along the Tethyan belt.In the first subproject, the combined Lesser Caucasus and Eastern Pontides setting offers the possibility to reconstruct the metallogenic evolution of a segment of the Eurasian margin, during progressive built up of a magmatic arc, and its subsequent sagging, before Tertiary collisional and post-orogenic extensional processes took over along the Tethys belt. The main deposits in this setting are porphyry, and epithermal systems, and controversial deposits interpreted as transitional between volcanogenic massive sulphide-epithermal-porphyry systems. This study will be complementary to the one carried out in the southeast European Balkan belt, although there are subtle differences in their respective geodynamic evolutions.For the second subproject, the exceptional setting of the Meghri-Ordubad pluton in the southernmost Lesser Caucasus allows us to investigate several aspects of metal enrichment in a limited crustal segment in an evolving geodynamic setting. The Meghri-Ordubad pluton is only comparable to the collisional to post-collisional settings in the Himalaya. This composite pluton is characterized by pulsed magmatic and ore-forming events during the Eocene, the Oligocene and the Miocene, including major porphyry-Cu-Mo porphyries, and subsidiary epithermal deposits. We will investigate a sequence of magmatic and metallogenic events during Eocene Neotethys subduction, followed by Oligo-Miocene collision to post-collision events related to the collision between Arabia and Eurasia, the age of which is still highly debated. This study will also allow us to constrain the source of metals and sulphur in Mo-enriched porphyry environments, which are commonly interpreted in terms of two different settings: either alkaline, mafic magmas in rifts or magmatic differentiation in the upper crust. The third subproject examines the Aegean sector of the Tethys belt, which is notorious for its major post-orogenic, extensional tectonic evolution concomitant with southward slab retreat since the Late Eocene. Post-orogenic extension was accompanied by exhumation of metamorphic core complexes along detachment faults, supradetachment sedimentation, hydrothermal fluid circulation, volcanism and epithermal ore formation. Absolute age relationships of Neogene post-orogenic tectonic, ore-forming and magmatic events will be obtained for the Menderes Massif, Turkey, and fluids and hydrothermal processes will be examined in different post-orogenic ore-forming events. Thermogeochronology will be applied to constrain uplift and exhumation.This project is significant from an economic and societal point of view, and should ultimately benefit our human society. Our results and interpretations will be of great value to exploration and mining companies, and governmental agencies to improve exploration programs for finding new mineral resources and improve strategies for extending reserves in presently producing mines, including such critical commodities as antimony, rhenium, molybdenum, tellurium, gold and copper.
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