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Explanatory Notes to the Map of Proterozoic Geology of Western Saudi Arabia

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Explanatory Notes to the Map of Proterozoic Geology of Western Saudi Arabia EXPLANATORY NOTES TO THE MAP OF PROTEROZOIC GEOLOGY OF WESTERN SAUDI ARABIA BY PETER R. JOHNSON TECHNICAL REPORT SGS-TR-2006-4 1427 H 2006 G A Technical Report prepared by the Saudi Geological Survey, Jeddah, Kingdom of Saudi Arabia The work on which this report is based was performed in support of Saudi Geological Survey Subproject 4.1.1.1.6 — Compilation and updating of the Arabian shield digital map. It has been edited and reviewed by staff of the Saudi Geological Survey. Product names used in this report are for descriptive purposes and in no way imply endorsement by SGS. This report is a product of the Saudi Geological Survey; if the information herein is used in any form, either quoted or paraphrased, this report should be properly cited using the full serial number, the author's name(s), and the year of publication. The correct citation for this report is: Johnson, P.R., 2006, Explanatory notes to the map of Proterozoic geology of western Saudi Arabia: Saudi Geological Survey Technical Report SGS-TR-2006-4, 62 p., 22 figs., 2 plates. In common with most reports produced by the Saudi Geological Survey, this report is available for sale to the public in hard copy format or on CD in PDF format. Please contact the SGS Publications Center at the address in Jeddah below for more information. Index map of the Arabian Peninsula For more information about the Saudi Geological Survey visit our website www.sgs.org.sa or write to or visit our headquarters in Jeddah or our office in Riyadh. Saudi Geological Survey Saudi Geological Survey-Riyadh Office Post Office Box 54141, Jeddah 21514 Post Office Box 6955, Riyadh 11452 Tel. (966-2) 619-5000 Tel. (966-1) 476-5000 TABLE OF CONTENTS ABSTRACT (ARABIC/ENGLISH)......................................................................................................................... 1 INTRODUCTION (ARABIC)............................................................................................................................... 2 INTRODUCTION................................................................................................................................................. 3 COMPILATION PROCESS................................................................................................................................... 4 LITHOSTRATIGRAPHY AND GEOCHRONOLOGY ....................................................................................... 5 LITHOSTRATIGRAPHIC REVISION ................................................................................................................. 6 GEOLOGIC OVERVIEW.................................................................................................................................... 10 PALEOPROTEROZOIC...................................................................................................................................... 12 SOUTH LIBAB ORTHOGNEISS, ~1800 Ma ............................................................................................................................................. 12 MUHAYIL SUITE, 1850-1670 Ma............................................................................................................................................................... 13 TONIAN............................................................................................................................................................... 13 MAKKAH SUITE, AGE UNCERTAIN ....................................................................................................................................................... 13 CRYOGENIAN .................................................................................................................................................... 14 LAYERED CRYOGENIAN LITHOSTRATIGRAPHIC UNITS................................................................................................................ 14 Bidah belt volcanic and sedimentary rocks, ~855-815 Ma.............................................................................. 14 Al Lith belt volcanic and sedimentary rocks, ~850-810 Ma............................................................................ 14 Isamah formation, ~840 Ma .......................................................................................................................... 15 Sumayir formation, ~830 Ma ........................................................................................................................ 15 Samran group, 825-745 Ma........................................................................................................................... 15 Shwas belt volcanic and sedimentary rocks, >815 Ma .................................................................................... 16 Tayyah belt volcanic and sedimentary rocks, >815 Ma................................................................................... 16 Muwayh formation, age uncertain ................................................................................................................. 17 At Ta’if group, >815 Ma ............................................................................................................................... 17 Tamran formation, >810 Ma......................................................................................................................... 17 Birak group, >805 Ma ................................................................................................................................... 18 Tays formation and Kabid paragneiss, ~800 Ma ............................................................................................ 18 Mughah complex, age uncertain .................................................................................................................... 19 Hali group, 795-780 Ma ............................................................................................................................... 19 Arj and Mahd groups, ~785-775 Ma ............................................................................................................. 19 Zibarah group, age uncertain......................................................................................................................... 20 Zaam group, 760-710 Ma ............................................................................................................................. 21 Bayda group, age uncertain............................................................................................................................ 21 Ghamr group, ~750 Ma ................................................................................................................................ 22 Siham group, 750-685 Ma ............................................................................................................................ 22 Al Qunnah formation, >745 Ma.................................................................................................................... 22 Khadra belt volcanic and sedimentary rocks, ~745-730 Ma ........................................................................... 22 Al Ays group, <745->700 Ma ........................................................................................................................ 23 Banana and Sufran formations, >740 Ma....................................................................................................... 23 Malahah belt volcanic and sedimentary rocks, >730 Ma ................................................................................ 23 Sarjuj formation, age uncertain...................................................................................................................... 24 Hulayfah group, >720 Ma ............................................................................................................................. 24 Milhah formation, >715 Ma.......................................................................................................................... 24 Ghawjah formation, >710 Ma ....................................................................................................................... 24 Hegaf formation, >710 Ma............................................................................................................................ 24 Silasia formation, >710 Ma............................................................................................................................ 25 Zaytah formation, age uncertain .................................................................................................................... 25 Amlas formation, age uncertain ..................................................................................................................... 25 Hinshan formation, age uncertain ................................................................................................................. 25 Ash Sha’ib group, age uncertain..................................................................................................................... 25 Furayh group, age uncertain .......................................................................................................................... 26 Ar Rika formation, >700 Ma ......................................................................................................................... 26 Abu Dhira’ah and Ar Ridaniyah formations, ~695 Ma................................................................................... 26 i Dhiran, Nafi, and
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