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ROCKS ASSOCIATED WITH NORTHSOUTH FAULTS
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abundant actinolite albite amphibolite ancient gold mines andesite anhedral Arabian Shield biotite calcite chlorite clasts color index commonly consists contains crystals deformation diabasic dikes dip steeply eolian eolian sand epidote Flanigan gabbro gabbroic gamma Geological grades granitic granodiorite gneiss gravel graywacke greenschist facies greenstone Group rocks Halaban clastic unit Halaban Group Halaban rocks Hali Group Hali rocks Hali schist hornblende quartz diorite hydrothermal alteration Ishmas east fault Ishmas Kabir Ishmas west Jabal Ishmas quadrangle Kingdom of Saudi layered locally lower Halaban mafic magnetic lineation magnetic pattern magnetite marble massive medium grained metamorphism Mineral Resources Nabitah fault zone Najd parallel pediment phenocrysts plagioclase plate pluton porphyritic Precambrian quartz monzonite Quartz vein rangle recrystallized Saudi Arabia schistosity segment sericite serpentinite Shark Umm Shat shear silicic sparse sq km stilpnomelane strike sulfides surficial deposits talc-actinolite schist thick trenches tuff volcanic rocks volcanic unit Wadi Bishah west fault widespread