The Küre VMS (volcanogenic massive sulfide) deposit associated with the paleo-Tethys ophiolite, Turkey: allochthonous sulfide ore blocks in terrigenous sedimentary rocks
1999 年 105 巻 5 号 p. IX-X
詳細
1999 年 105 巻 5 号 p. IX-X
In the Pontides belt of northern Turkey, a number of ophiolites, which represent the paleo-Tethys oceanic crust-mantle of the Permian to Jurassic and active continental margin sequences of the Permian to early Jurassic are juxtaposed along the Tethyan suture (Sengor et al., 1980). Around the Kure mine dismembered ophiolite lacking sheeted dike complex is chaotically jumbled among terrigenous sedimentary rocks. In the Kure open pit, blocks of massive and stockwork sulfide ore associated with hyaloclastite ranging from a few tens of centimeters to few hundred meters in diameter are inlaid in scaly argillite with a prominent tectonic contact; so-called melange. The oceanic crust of paleo-Tethys overlain by a Cyprus type deposit is thought to be mingled with trench-fill terrigenous sediments and accreted to the continent. Although VMS deposits in sedimentary settings such as a back arc basin or marginal sea have been defined as Besshi type deposits (e. g., Slack, 1993), what would be the product if allochthonous VMS deposits, such as in this case, were introduced to a deeper level within the subduction zone and consequently undergone high P/T metamorphism ?
