Document Details
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Document Type |
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Article In Conference |
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Document Title |
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gold bearing listvenite in jabal alghadarah area central arabian shield kingdom od saudi arabia جبل الغدارة المركزي الذهب واضعة في منطقةالدرع العربي المملكة السعودية جزيره العرب |
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Subject |
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gold bearing listvenite in jabal alghadarah area central arabian shield kingdom od saudi arabia |
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Document Language |
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Arabic |
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Abstract |
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Jabal Al Ghadarah area is located on the eastern side of the N-S trending Nabitah Suture zone, which is characterized by the occurrence of abundant ophiolitic rocks. The ophiolitic melange fonn a N-S trending belt and consists of il11bricated slabs frol11 the ophiolitic rocks and the forearc volcanosedil11entary sequence. At Jabal Al Ghadarah, the ultral11afic rocks and associated listvenites are l11ainly exposed (~ 300 m) along a N-S trending thrust fault dipping to the east, in contact with the late Hulayfah sedil11ents. The ultramafic rocks are characterized by the presence of numerous fragl11ents of variable sizes from l11etagabbros, l11etabasalts, schists, al11phibolites and marbles. According to their chel11icaJ and mineraJogical compositions, the listvenites are differentiated into l11agnesite-, dolomite- and calcite- dominated types. The different types consist essentially of varying proportions of magnesite, dolomite, calcite and quartz with minor chromite, magnetite and nickelefrous pyrite and Ni-arsenides. The Ni-sulphides and nickel arsenides are present in noticeable amounts in magnesite and dolomite dominated types. COl11pared to the serpentinized ultral11afic rocks, the listvenites are generally characterized by the addition of CO2, K20, CaO, Cu, Zn, As, and Au and leaching of MgO and NiO. Au and As contents show positive correlation and are higher in the magnesite and dolol11ite dOl11inated types where gold values up to 0.29 g/t and As values up to 1763 ppm were recorded. The widespread carbonatization and silicification observed in the listvenite and their absence in the late Hulayfah volcanosedimentary rocks, which occupy the footwall of the thrust, suggest that the listvenitization processes of the serpentinized ultramafic rocks took place during obduction and prior to thrusting onto late Hulayfah sediments. The results encourages a detailed exploration program for the ultral11afic rocks, associated with the different suture zones in Arabian Shield, as a potentiaJ target for the occurrence of gold bearing Jistvenite. |
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Conference Name |
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the eighth arab conference on mineral resources |
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Duration |
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From : 17/08/1424 AH - To : 20/08/1424 AH
From : 13/10/2003 AD - To : 16/10/2003 AD |
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Publishing Year |
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1424 AH
2003 AD |
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Number Of Pages |
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3 |
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Article Type |
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Article |
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Conference Place |
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snaa |
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Organizing Body |
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Arab Organization for Industrial Development and Mining |
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Added Date |
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Monday, October 24, 2011 |
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Researchers
| هشام محمد حربي | harbi, hesham muhammed | Researcher | Doctorate | |
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