Origin and concentration mechanism of Titanium bearing heavy minerals deposits and rare earth elements in the Caspian Sea littoral sands
The studied area is located in the Alborz interland (as a result of the collision between Eurasian plate and Iranian micro-plate) with approximately 3000 km2 extension. The watersheds which originate from heights of Alborz mountains are mainly composed of gabbro, monzogabbro,monzonite, ultramafic and mafic massive. The destruction of these lithological units is the most important sources for heavy minerals. These watersheds are discharged to the Caspian Sea through the Gilan littoral plain. The studied area show placer-type and littoral sand type deposits which contain heavy minerals such as ilmenite,titanomagnetite and magnetite with relative abundance of Zr (2900 ppm) and V (200-3000ppm).Transported deposits are leached by eustatic regime of the sea. This process increases the concentration of Heavy minerals. In some parts of area, the thickness of the titanium bearing heavy minerals units are about 25 cm. Average thicknesses of units with 60 to 80 ％ heavy minerals is about 1 meter. ilmenite minerals have 8-10 ％ TiO2.
Alborz Hinterland orogeny Caspian sea exsolution lamella placer deposit
R.Monsef M.Pirouz M.H Emami
Estahban Islamic Azad University-Fars-Iran Geological Survey of Iran-Research Institute of Earth Sciences
国际会议
第八届国际矿床地质会议(Proceedings of the Eighth Biennial SGA Meeting)
北京
英文
202-203
2005-08-18（万方平台首次上网日期，不代表论文的发表时间）