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carbonatite.pptx
- 1. SANA’A UNIVERSITY FACULTY OFPETROLEUM & NATURAL RESOURCES CARBONATITE PREPARED BY: ENG. MAGED SALEH AL- GHODHAIFI ENG. YOSUF HUSSAIN AWADH
- 2. Carbonatite is anigneous rock consisting chiefly of carbonate minerals (more than 50%) crystallized from a carbonate magma. generally associated with kimberlites and alkalic rocks. What istheCarbonatite? 01.
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- 4. Carbonatite is anigneous rock consisting chiefly of carbonate minerals crystallized from a carbonate magma. Carbonatites are often heterogeneous in outcrop, and any magmatic rock containing more than 50 modal % of igneous carbonate arguably qualifies as carbonatite, though most contain more. What istheCarbonatite? 01.
- 5. Non-essential minerals- theseminerals are common, sometimes major components, but are not always present: Mineralogy ofCarbonatite 02. Calcite CaCO3 Dolomite CaMg(CO3)2 Ankerite Ca(Fe2+,Mg)(CO3)2 Siderite FeCO3 Gregoryite )Na2,K2,Ca)CO3 along with lesser silicates, phosphate minerals, and oxides.
- 6. Carbonatite has afine to coarse-grained texture. calcitic sovite (coarse textured) and alvikite (finer textured) texture ofCarbonatite 03.
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- 8. Origin ofCarbonatite 04. 2 1 3 immiscible separation of parental carbonatedsilicate magmas at crustal or mantle pressures. crystal fractionation of parental carbonated silicate magmas such as olivine melilitites or kamafugites. There are currently three main hypotheses explaining the origin of carbonatite melts: low-degree partial melting of carbonated mantle peridotite below 70 km depth.
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- 10. Classification ofCarbonatite 05. In mineralogical termsthe following types of carbonatite can be distinguished:
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- 12. forms ofCarbonatite 06. Most of thecarbonatites are shallow intrusive bodies of calcite-rich igneous rocks in form of volcanic necks, dykes, and cone-sheets. These generally occur in association with larger intrusions of alkali- rich silicate igneous rocks. The extrusive carbonatites are particularly rare, only 49 are known, and they appear to be restricted to a few continental rift zones, such as the Rhine valley and the East African rift system
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- 15. Economicimportance ofCarbonatite 06. Carbonatites may containeconomic or anomalous concentrations of rare-earth elements, phosphorus, niobium– tantalum, uranium, thorium, copper, iron, titanium, vanad ium, barium, fluorine, zirconium, and other rare or incompatible elements.
- 16. Occurrence ofCarbonatite 07. Overall, 527 carbonatite localitiesare known on Earth, and they are found on all continents and also on oceanic islands.
- 17. 08. • Abyan Governorate- Lawdar District • Dykes of carbonate rocks, cutting gneisses in the Lowder-Mudiah area to the south of Wadi Azzan. • Locality type: Group of Dikes • Age: 840 Ma Carbonatite InYemen
- 18. ً شكرا لك م T H AN K Y O U S O M U C H M A G E D S A L E H H A D I
- 19. Classification ofCarbonatite 04. In mineralogical termsthe following types of carbonatite can be distinguished: dolomite-carbonatite more than 90% of the carbonate is dolomite. ferroan-carbonatite the main carbonate mineral is ferroan dolomite, ankerite or siderite. These can be distinguished from other carbonates by stain tests. natrocarbonatite composed essentially of sodium, potassium and calcium carbonate minerals. 1 2 3 4