Sedimentology of the lower Hofuf Formation, Eastern Province of Saudi Arabia, and the chances for gold prospection

Sobhi Nasir, Abdul Razak Al-Sayigh, Abdulrahman Safarjalani

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Fine-grained to pebbly coarse-grained fluvial sandstones of the Late Miocene to Pliocene Hofuf Formation crop out in the Eastern Province of Saudi Arabia. The sandstones comprise three distinct facies: clast-supported gravel and conglomerate, coarse-grained sandstone and fine-grained sandstone. The gravels and conglomerates are rich in pebbles of various igneous and metamorphic rocks derived from the gold-bearing Arabian Shield as well as limestone, dolomite and marl derived from the Phanerozoic. The sandstone shows a uniform framework composition dominated by monocrystalline quartz and feldspar with less abundant polycrystalline quartz, calcite, and micas and igneous, metamorphic and sedimentary rock fragments. A geochemical signature of gold (placer) deposits was detected in the lower unit of the Hofuf Formation in the Hofuf and Harad areas. The very fine-grained fraction (0 <125 μm) of the Hofuf area contains the highest amounts of gold (0.16-1.87 ppm), the gold dispersion anomaly in the Haradh area is of a high extent (24.22-4.83 ppm). The primary gold source is probably related to weathering of paleo-placers, and/or to weathering and transport of gold-bearing igneous rocks from the Arabian Shield.

Original languageEnglish
Pages (from-to)325-342
Number of pages18
JournalNeues Jahrbuch fur Geologie und Palaontologie - Abhandlungen
Volume243
Issue number3
DOIs
Publication statusPublished - Mar 2007

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sedimentology
gold
sandstone
igneous rock
metamorphic rock
conglomerate
shield
gravel
weathering
quartz
placer deposit
marl
pebble
Phanerozoic
clast
province
feldspar
dolomite
sedimentary rock
Pliocene

Keywords

  • Arabian shield
  • Cenozoic
  • Fluvial transport
  • Gold deposits

ASJC Scopus subject areas

  • Palaeontology

Cite this

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title = "Sedimentology of the lower Hofuf Formation, Eastern Province of Saudi Arabia, and the chances for gold prospection",
abstract = "Fine-grained to pebbly coarse-grained fluvial sandstones of the Late Miocene to Pliocene Hofuf Formation crop out in the Eastern Province of Saudi Arabia. The sandstones comprise three distinct facies: clast-supported gravel and conglomerate, coarse-grained sandstone and fine-grained sandstone. The gravels and conglomerates are rich in pebbles of various igneous and metamorphic rocks derived from the gold-bearing Arabian Shield as well as limestone, dolomite and marl derived from the Phanerozoic. The sandstone shows a uniform framework composition dominated by monocrystalline quartz and feldspar with less abundant polycrystalline quartz, calcite, and micas and igneous, metamorphic and sedimentary rock fragments. A geochemical signature of gold (placer) deposits was detected in the lower unit of the Hofuf Formation in the Hofuf and Harad areas. The very fine-grained fraction (0 <125 μm) of the Hofuf area contains the highest amounts of gold (0.16-1.87 ppm), the gold dispersion anomaly in the Haradh area is of a high extent (24.22-4.83 ppm). The primary gold source is probably related to weathering of paleo-placers, and/or to weathering and transport of gold-bearing igneous rocks from the Arabian Shield.",
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author = "Sobhi Nasir and Al-Sayigh, {Abdul Razak} and Abdulrahman Safarjalani",
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AU - Al-Sayigh, Abdul Razak

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N2 - Fine-grained to pebbly coarse-grained fluvial sandstones of the Late Miocene to Pliocene Hofuf Formation crop out in the Eastern Province of Saudi Arabia. The sandstones comprise three distinct facies: clast-supported gravel and conglomerate, coarse-grained sandstone and fine-grained sandstone. The gravels and conglomerates are rich in pebbles of various igneous and metamorphic rocks derived from the gold-bearing Arabian Shield as well as limestone, dolomite and marl derived from the Phanerozoic. The sandstone shows a uniform framework composition dominated by monocrystalline quartz and feldspar with less abundant polycrystalline quartz, calcite, and micas and igneous, metamorphic and sedimentary rock fragments. A geochemical signature of gold (placer) deposits was detected in the lower unit of the Hofuf Formation in the Hofuf and Harad areas. The very fine-grained fraction (0 <125 μm) of the Hofuf area contains the highest amounts of gold (0.16-1.87 ppm), the gold dispersion anomaly in the Haradh area is of a high extent (24.22-4.83 ppm). The primary gold source is probably related to weathering of paleo-placers, and/or to weathering and transport of gold-bearing igneous rocks from the Arabian Shield.

AB - Fine-grained to pebbly coarse-grained fluvial sandstones of the Late Miocene to Pliocene Hofuf Formation crop out in the Eastern Province of Saudi Arabia. The sandstones comprise three distinct facies: clast-supported gravel and conglomerate, coarse-grained sandstone and fine-grained sandstone. The gravels and conglomerates are rich in pebbles of various igneous and metamorphic rocks derived from the gold-bearing Arabian Shield as well as limestone, dolomite and marl derived from the Phanerozoic. The sandstone shows a uniform framework composition dominated by monocrystalline quartz and feldspar with less abundant polycrystalline quartz, calcite, and micas and igneous, metamorphic and sedimentary rock fragments. A geochemical signature of gold (placer) deposits was detected in the lower unit of the Hofuf Formation in the Hofuf and Harad areas. The very fine-grained fraction (0 <125 μm) of the Hofuf area contains the highest amounts of gold (0.16-1.87 ppm), the gold dispersion anomaly in the Haradh area is of a high extent (24.22-4.83 ppm). The primary gold source is probably related to weathering of paleo-placers, and/or to weathering and transport of gold-bearing igneous rocks from the Arabian Shield.

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