نتایج جستجو برای: ophiolitic

تعداد نتایج: 353  

2004
Bin Zhu William S. F. Kidd David B. Rowley Brian S. Currie

Turbiditic sandstones from the mid–Late Cretaceous Tianba Flysch sequence are well exposed near Tianba in the north Nieru Valley, southern Tibet, and contain significant amounts of chrome-rich spinels. Microprobe results show that the spinels have a well-developed Fe-Ti trend and have Cr/( ) 0.4–0.65, Mg/( ) 0.3–0.9, and TiO2 2 Cr Al Mg Fe 11%. The occurrence of melt inclusions, and well above ...

عابدی, علیرضا,

Huntite mineral with formula CaMg3(C03}4 is a natural carbonatic material with rhombohedral system that its composition is between dolomite (CaMg(C03h) and magnesite. For the first time Huntite was found in American Nevada province, then in other places i,e. Poland, Hungary, France, Australia, Iran and Greece. According to thermOdynamic, Huntite forms in condition of low pressure and tcm...

Journal: :Mining, metallurgy & exploration 2022

Abstract This study focused on joint interpretation of the aeromagnetic and radiometric data to allocate describe structural elements mineralization zones such as uranium, gold, sulfide in Gebel Umm Tineidba its surroundings, Eastern Desert, Egypt. The region is covered by exposures Precambrian rocks gneisses, migmatites, ophiolitic mélange, metavolcanics, younger granites, Quaternary sedimenta...

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