Geology and Resources of Basalt Quarry Site Kishb-6 (Jabal Al Labah), Southern Harrat Kishb, Kingdom of Saudi Arabia

SGS-OF-2002-5 Khalid Abdul-Hafez
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ABSTRACT
Quarry site Kishb-6 is composed of a single basaltic scoria cone with two craters called Jabal al Labah and is surrounded by its own basalt lava flows.  One crater opens to the northwest, and the other opens to the southeast.  The cone measuring 900 m north-south and 800 m east-west was mapped at 1:5,000 scale.  The cone is composed of a coarse airfall deposit of highly vesicular black scoria, suitable for industrial purposes as lightweight aggregate.  A number of laboratory tests were carried out on the vesicular basaltic samples obtained from the ground surface.  Twelve samples were tested for density by measuring 100 clasts for each sample.  The density range for the samples is from 0.5 to 1.4, but the mean density from the samples ranges from 0.5 to 1.2.  It was determined that the weight of 1 m3 of vesicular basaltic scoria is approximately 640 kg/m3.  Grain-size analyses were carried out on 12 samples of vesicular basaltic scoria.  The samples have mean grain sizes from 32 to 2 mm with most in the range of 32 to 4 mm.  Thirteen samples were subjected to 15-day tests for pozzolanic activity.  All of the samples were positive for pozzolanic activity.  Chemical analyses were made for 14 basalt samples with a silica range from minimum 48.84 to maximum 51.00 percent.  The estimated outcropping resources of the vesicular basaltic scoria materials, as outlined in the map, is about 8.3 million tons.

 

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Abdul-Hafez, Kh., 2004, Geology and resources of basalt quarry site Kishb-6 (Jabal al Labah), Southern Harrat Kishb, Kingdom of Saudi Arabia: Saudi Geological Survey Open-File Report SGS-OF-2002-5, 15 p., 7 figs., 5 tables, 1 app., 1 plate.