Mishrif Formation (Cenomanian–Turonian), Southern Arabian Gulf: Carbonate Platform Growth Along a Cratonic Basin Margin
Trevor P. Burchette, 1993. "Mishrif Formation (Cenomanian–Turonian), Southern Arabian Gulf: Carbonate Platform Growth Along a Cratonic Basin Margin", Cretaceous Carbonate Platforms, J. A. Toni Simo, Robert W. Scott, Jean-Pierre Masse
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Name: Shilaif basin in the Rub al Khali (Arabian) basin
Author: Trevor P. Burchette
Location: From 52° to 55° east longitude and 24° to 26° north latitude, southern Arabian Gulf
Geologic time interval: Late Albian–early Turonian
Tectonic-sedimentary setting: Passive margin of Arabian craton; drowned foreland cratonward of peripheral bulge
Basin type: Tectonic; cratonic interior basin generated by sag or growth of peripheral bulge to Oman mountains; restricted and density stratified
Paleoclimate: Subarid in the Albian-Cenomanian to humid in the Turonian
Platform type: Ramp or low gradient rimmed shelf (shoal with patch reefs); leeward and windward margins recognizable
Platform geometry: Linear length of platform margin >2000 km encircling an elongated basin about 300 km across. Accretion caused a sedimentary wedge that advanced 75 km into basin. Width of shoal margin is several kilometers; thickness is 100–200m.
Facies and fossils: Basin: cyclic organic-rich pelagic foraminiferal packstone. Protoglo-bigerinids, hedbergellids, oligosteginids, Exogyra, and Placunopsis. Slope: bioturbated bioclastic packstone, grain size fining basinward. Diverse infaunal bivalves. Shoal: bioturbated bioclastic packstone and grainstone. Scattered radiolitid rudists and other bivalves. Biostrome: rudstone and floatstone with caprinid and radiolitid rudists. Chaetetids and bivalves. Back shoal: interbedded lagoonal lime mudstone and bioclastic packstone. Chondrodonta, radiolitid rudists, bivalves. Platform interior: bioturbated lime mudstone with benthic foraminiferal fauna.
Systems tracts and stacking patterns: Two third-order sequences. Sequence 1: vertical accretion followed by lateral accretion. Upper sequence boundary well defined. Lower sequence boundary and transgressive stage poorly known. Parasequences poorly defined on platform, well defined in basin by flooding events. Salt withdrawal and diapirism created intra-platform sequences and local unconformities. Sequence 2: Muddy lowstand and transgressive ramp (Tuwayil Member) followed by highstand shallow water carbonates (Ruwaydha Member). Upper sequence boundary type 2(?), but tectonically enhanced unconformity continued in east.