naa a22 4500 510736122 CHVBK 20180411083010.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1134/S107570151309002X doi (NATIONALLICENCE)springer-10.1134/S107570151309002X Structural analysis for metavolcanics and their metapyroclastics at gold deposit of the Mahd Ad Dahab area, Arabian Shield, Saudi Arabia [Elektronische Daten] [Osama Kassem, Abdel Al Bassam, Faisal Zaidi] The present study focuses on the gold mining in Mahd Ad Dahab region of Saudi Arabia. The study aims to assess the spatial relationship between tectonic contacts in Mahd Ad Dahab area and to provide a meaningful hypothesis relating gold metallogeny to the evolution of the Arabian Shield. Distribution and localization of gold occurrences in the study area was envisaged based on the different styles of microstructures and the major deformation phases affecting the area. The detailed petrographical and mineralogical investigations indicate that the metavolcanic rocks at the Mahd Ad Dahab gold mine area can be classified into metabasalt, metaandesite, and the felsic varieties (metadacite, metarhyodacite and metarhyolite) associating their metapyroclastics (conglomerate and tuffs). Furthermore, quartz forms allotriomorphic crystals which exhibit wavy extinction, deformational lamina and foliation due to subsequent deformations. Furthermore, we conclude that finite strain in the deformed rocks is of the same order of magnitude for all units of metavolcano-sedimentary rocks. Furthermore, contacts formed during intrusion of plutons with some faults in the Mahd Ad Dahab area under brittle to semi-ductile deformation conditions. In this case, finite strain accumulated during superimposed deformation on the already assembled nappe structure. It indicates that the contacts formed during the accumulation of finite strain. Pleiades Publishing, Ltd., 2013 Kassem Osama SGSRC, Department of Geology, Science faculty, King Saud University, P.O. Box 2455, 11451, Riyadh, Kingdom of Saudi Arabia aut Al Bassam Abdel SGSRC, Department of Geology, Science faculty, King Saud University, P.O. Box 2455, 11451, Riyadh, Kingdom of Saudi Arabia aut Zaidi Faisal SGSRC, Department of Geology, Science faculty, King Saud University, P.O. Box 2455, 11451, Riyadh, Kingdom of Saudi Arabia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/6(2013-11-01), 482-493 1075-7015 55:6<482 2013 55 11477 https://doi.org/10.1134/S107570151309002X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S107570151309002X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kassem Osama SGSRC, Department of Geology, Science faculty, King Saud University, P.O. Box 2455, 11451, Riyadh, Kingdom of Saudi Arabia aut NATIONALLICENCE 700 1- Al Bassam Abdel SGSRC, Department of Geology, Science faculty, King Saud University, P.O. Box 2455, 11451, Riyadh, Kingdom of Saudi Arabia aut NATIONALLICENCE 700 1- Zaidi Faisal SGSRC, Department of Geology, Science faculty, King Saud University, P.O. Box 2455, 11451, Riyadh, Kingdom of Saudi Arabia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/6(2013-11-01), 482-493 1075-7015 55:6<482 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer