Constraining the relation between large-scale extensional tectonics, fluid flow and carbonate hosted Pb-Zn ore formation - geochronology of the Ja-bali deposit (Yemen)

密西西比河谷型（MVT）铅锌矿床产于晚太古代至中生代的碳酸盐岩台地序列中。对铅锌矿成矿的形成有不同的古流体流动模式。矿石形成、古流体流动和构造制度之间的联系取决于矿石形成的准确年龄。不幸的是，这种矿床类型的地质年代学调查非常困难；最有希望的方法是对球形矿物进行Rb-Sr测年。与绝大多数已知年龄的MVT矿床被认为与挤压构造有关不同，Jabali（也门）MVT型矿床是一个例外，因为它被认为是在一个伸展构造制度下形成的。Jabali矿床的Rb-Sr定年有助于更深入地了解与热液流体流动有关的碳酸盐台地矿床的形成，特别是与伸展构造制度有关的矿床。

Epigenetic Mississippi Valley type (MVT) Pb-Zn deposits occur in carbonate platform successions of Late Achaean to Mesozoic age. Distinct paleo-fluid flow models are available for the formation of Pb-Zn ore mineralization. The connection between ore formation, paleo-fluid flow and tectonic regimes depend on the availability of accurate ages for ore formation. Unfortunately, geochronological investi-gations of this deposit type are exceedingly difficult; the most promising approach is Rb-Sr dating of sphale-rite.The Jabali deposit (Yemen) of MVT type is exceptional because it is assumed to have formed in an extensional tectonic regime, unlike the overwhelming majority of MVT deposits with known age that are believed to be related to compressional regimes. Rb-Sr dating of the Jabali deposit can support a deeper insight into the formation of ore deposits in carbonate platforms related to hydrothermal fluid flow, especially in connection with extensional tectonic regimes.