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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Genesis of gold mineralixation ar zalm mine central saudi arabia نشأة تمعدن الذهب ع زالم الألغام السعودية جزيره العرب المركزية |
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Subject |
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Genesis of gold mineralixation ar zalm mine central saudi arabia |
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Document Language |
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Arabic |
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Abstract |
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Gold mineralization in the Zalm area extends for about 1 kmi:with variable thickness and is confined to a NE-trending fracture zone, which is considered as a second-order fault and extensional fissures, associated with NW-trending strike-slip Najd fauh system. The mineralization is present in the forrn of stockwork of quartz veins (few centimeters thick) and veinlets (few millimeters thick), and is hosted by monzogabbro (MO), monzonite (M), quartz monzonite (QM), and alkali pyroxene granite (0). The waH rock alterations include sercitization,
chlor~tization, carbonitization, silicification and sulfidation. Usually the quartz veins are surrounded by a bleached zone separating it from the wall rock. Oenerally, the veins are poorly mineralized and ore minerals are represented mainly by pyrite and arsenopyrite, minor galena, sphalerite, chalcopyrite and traces of sulfosa1ts. Oold is present as electrum or as gold tellurides associated with pyrite and arsenopyrite. Fluid inclusion studies led to the recognition of three types: H20-C02- NaCl (Type 1); H20±C0rNaCl (Type 2); and H20-NaCI (Type 3). The ma]'6rity of Thtot of type 1 inclusions fall between 260 - 340°C and the saliruty ranges between 2 and 4.8 wt% NaCl equivl. Type 2 inclusions are characterized by their lower volume proportions of vapour, lower
Thtot (170 to 255 OC) and salinity of 2.5 to 5 wt% NaCI equiv. The aqueous H20-NaCI inclusions have Thtot within the range of 70-120°C
and they are of lower salinity (1 to 5 wt% NaCl equiv). Generally, the moderate to low temperatures and low salinities of the fluid inclusions favour a meteoric origin of the mineralizing fluids. Fluid inclusion studies as weH as petrographic criteria and the trace elements (Cu, Pb,
Zn, and As) contents of the host rocks (MG, M, QM, and 0) indicate that they could be the source of the metaHic elements which were leached and remobilized by the percolating meteoric water. |
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Conference Name |
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Sixth Conference of Geochemistry at the University of Alexandria |
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Duration |
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From : 01/08/1425 AH - To : 02/08/1424 AH
From : 15/09/2004 AD - To : 16/09/2004 AD |
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Publishing Year |
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1424 AH
2004 AD |
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Number Of Pages |
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6 |
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Article Type |
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Article |
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Conference Place |
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Cairo - Arab Republic of Egypt |
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Organizing Body |
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Sixth Conference of Geochemistry at the University of Alexandria |
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Added Date |
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Monday, October 24, 2011 |
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Researchers
| هشام عبده حربي | harbi, hesham abduh | Investigator | Doctorate | |
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