The distribution of ore-deposit types in different sectors of the circum-Mediterranean realm that have been affected by subduction processes since the Cretaceous varies in space and time. Sectors involved in W-directed subduction (Sardinia, Apennines–Maghrebides, Internal Betics, Tyrrhenian, Western-Eastern Carpathians) are dominated by relatively low-sulphidation epithermal (±VMS) deposits. Orogens formed by NE-directed subduction (Dinarides–Hellenides–Pontides–Anatolides–Taurides; DHPAT) were initially dominated by pluton-related porphyry–skarn–high-sulphidation epithermal associations. These distinct metallogenic styles can be related to the systematic tectono-magmatic asymmetry of E-NE- and W-directed subduction systems and are analogous to the relationship observed in circum-Pacific belts. Exceptions to this simple pattern occurred in the DHPAT in the Cenozoic, when deposit associations typical of both E-directed and W-directed systems were formed. Such exceptions are interpreted to reflect superimposition of contrasting subduction trends and inheritance from earlier metallogenic stages (Apuseni) or the interference of subduction processes with subduction-unrelated extension (Hellenides, West Anatolia).
Does subduction polarity control metallogeny? The Mediterranean case
NIMIS, PAOLO;
2015
Abstract
The distribution of ore-deposit types in different sectors of the circum-Mediterranean realm that have been affected by subduction processes since the Cretaceous varies in space and time. Sectors involved in W-directed subduction (Sardinia, Apennines–Maghrebides, Internal Betics, Tyrrhenian, Western-Eastern Carpathians) are dominated by relatively low-sulphidation epithermal (±VMS) deposits. Orogens formed by NE-directed subduction (Dinarides–Hellenides–Pontides–Anatolides–Taurides; DHPAT) were initially dominated by pluton-related porphyry–skarn–high-sulphidation epithermal associations. These distinct metallogenic styles can be related to the systematic tectono-magmatic asymmetry of E-NE- and W-directed subduction systems and are analogous to the relationship observed in circum-Pacific belts. Exceptions to this simple pattern occurred in the DHPAT in the Cenozoic, when deposit associations typical of both E-directed and W-directed systems were formed. Such exceptions are interpreted to reflect superimposition of contrasting subduction trends and inheritance from earlier metallogenic stages (Apuseni) or the interference of subduction processes with subduction-unrelated extension (Hellenides, West Anatolia).
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