Sulfide minerals in the Menez Gwen nonmetallic hydrothermal field (Mid-Atlantic Ridge) |
| |
| Authors: | A Yu Lein Yu A Bogdanov V V Maslennikov Syaoli Li N V Ulyanova S P Maslennikova A A Ulyanov |
| |
| Institution: | 1.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia;2.Institute of Mineralogy, Ural Division,Russian Academy of Sciences,Miass, Chelyabinsk oblast,Russia;3.Moscow State University,Leninskie gory, Moscow,Russia |
| |
| Abstract: | Mineralogy and geochemistry of the sulfide-bearing rocks and ores discovered in the Menez Gwen field are studied. Samples
were taken during the expedition of the Shirshov Institute of Oceanology (cruise 49, R/V Akademik Mstislav Keldysh. The mineral composition of rocks and ores were studied by the traditional methods of optical microscopy, scanning electron
microscopy (CAMSCAN), and microprobe analysis (EPMA SX-50). Contents of trace elements were determined by the laser ablation
inductively coupled plasma-mass spectrometry (LA-ICP-MS). The Zn-Cu ore comprises zonal sulfide chimney intergrowths. Numerous
Se-rich copper ore fragments occur in the volcanomictic layered gritstones and/or barite slabs. The mineral composition, zonality,
and association of trace elements in ore are typical of “black smokers” formed at the basalt base near the Azores Triple Junction
in the MAR. The results obtained make it possible to reconstruct formation history of the Menez Gwen hydrothermal field into
the high-temperature (Cu-Se association in ore clasts), medium-temperature (Zn-Cu-As association in ore), and recent (Ba-SiO2 association) stages. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
