sahand volcanic-sub-volcanic dome, along with several other magmatic domes in northwest iran and the southern part of tabriz fault show adakitic geochemical characteristics. sahand dome has mainly dacitic composition. the sio2 content and mg number of sahand dome range from 64 to 73 wt% and 27 to 57 respectively. sahand dome can be classified as high silica adakitic (hsa) type. the rocks studie...

The Iberian Pyrite Belt (IPB) covers a vast part of the SW of Spain and Portugal. This region is rich in sulfide deposits which have been exploited intensively. As a consequence, there is a large number of sources of acid mine drainages, characterized by very extreme pH conditions and high pollution load. Waters affected by acid mine drainage (AMD) can contain high concentrations of rare earth ...

In order to reveal the formation mechanism of different garnets and its implications for fluid evolution in Laoshankou Fe-Cu-Au deposit northern margin East Junggar (NW China), three types garnet have been investigated detail this study. (1) Type 1 grossular, formed at Ca-silicate stage (stage I, pre-mineralization stage), was replaced by 2 magnetite, displays a compositional range Grs44–53Adr4...

Carbonatite complexes and associated fenite zones are famous for their high-grade rare metal ores. The carbonatite–fenite generally contain high concentrations of light earth elements (LREE), thorium (Th), uranium (U). While most carbonatites closely related to continental rift zones, some can be observed in post-collisional tectonic environments. Özvatan nepheline syenite–carbonatite complex i...

This study focuses on the metabasite rocks of Nemba Complex Mayombe belt, an African segment Araçuaï-West Congo Orogen (A-WCO) extending from southwest Gabon to northwest Angola. These outcrops are in southwestern along Loukounga river. The complex is Neoproterozoic age and represents lower part west congolian Supergroup. objective this constrain geodynamic context petrology geochemistry metaba...