Abstract

Mississippi Valley–type (MVT) Zn-Pb deposits are widely believed to form in compressional tectonic environments, related to gravity-driven fluid flow. They are commonly spatially related to hydrocarbon reservoirs in orogenic foreland settings, but the genetic and temporal links between hydrothermal sulfide mineralization, basin evolution, and hydrocarbon generation remain tentative in most cases. We used direct Rb-Sr chronometry of sphalerite to constrain the age of the Jabali (central Yemen) MVT deposit, which is located in the well-studied oil-producing Sab´atayn Basin. A Rb-Sr age of 144.0 ± 4.3 Ma for sulfide mineralization obtained from a quantitative geochronological two-component paleomixing model coincides with a well-constrained episode of active rifting, oil generation, and expulsion in the Sab´atayn Basin during the Late Jurassic–Early Cretaceous.

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