The Middle to Late Triassic of Central Saudi Arabia with emphasis on the Jilh Formation. Part II: sequence stratigraphy, depositional and structural history, correlations and paleogeography

被引:0
|
作者
Le Nindre, Yves-Michel [1 ]
Davies, Roger Brett [2 ]
Issautier, Benoit [3 ]
Krystyn, Leopold [4 ]
Vaslet, Denis [5 ]
Vrielynck, Bruno [6 ]
Memesh, Abdullah [7 ]
机构
[1] Bur Rech Geol & Minieres, 58 Rue Gustave Flaubert, F-45100 Orleans, France
[2] Davies Geoconsulting, Wintergreen House,Queens Rd, Harrogate HG2 0HB, N Yorkshire, England
[3] Bur Rech Geol & Minieres, 3 Ave Claude Guillemin,BP 36009, F-45060 Orleans 2, France
[4] Univ Vienna, Geozentrum, Dept Palaeontol, Althanstr 14,Josef Holaubek Pl 2 UZA 2, A-1090 Vienna, Austria
[5] Bur Rech Geol & Minieres, 275 Route Royale, F-33240 La Lande De Pomerol, France
[6] Univ Pierre & Marie Curie UPMC, Inst Sci Terre Paris, UMR 7193, Paris, France
[7] Saudi Geol Survey, 54141 Ahmed bin Mohammed Al Ashab St, Jeddah 21514, Saudi Arabia
关键词
Saudi Arabia; Triassic; Jilh Formation; Minjur Sandstone; Sequence stratigraphy; Correlations; Paleogeography; CARNIAN MARKER DOLOMITE; KHALTA TYPE LOCALITY; REGIONAL RECOGNITION; IRAQ IMPLICATIONS; MINJUR SANDSTONE; BALUTI FORMATION; KHUFF FORMATION; EVOLUTION; SYSTEM; FACIES;
D O I
10.5802/crgeos.227
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
New biostratigraphic data reported by Le Nindre et al. (2023 - this volume) improve the sequence stratigraphic understanding of the Middle-Late Triassic mixed carbonate-silicilclastic Jilh Formation and overlying siliciclasticMinjur Formation at outcrop in Central Saudi Arabia. The Anisian Tr40, Ladinian Tr50, Julian Tr60, Tuvalian Tr70 and Alaunian Tr80 MFS are all identified and their ages discussed. A major Carnian-Norian hiatus ( Tr80 SB) approximates to but notably cuts across the mapped Jilh-Minjur Formation boundary. A younger LateNorian-Rhaetian transgression ( Tr90 MFS?) is also identified. All of these major transgressive-regressive sequences and hiatuses can be identified with confidence and correlated at the regional scale with time-equivalent carbonates. The ages of subsurface lithostratigraphic units identified elsewhere across the Arabian Plate, notably the "Jilh, Sefidar andMarker Dolomites", "Jilh Evaporite" (sometimes "Carnian Salinity Crisis") and the incertae sedis Baluti Formation, and their equivalence in the Saudi Arabian outcrops, are assessed in the light of these results. The presence of significant siliciclastics at the base of the Carnian stratigraphy ("Julian Clastic Event") is also discussed. Ladinian conodont faunas belonging to the Sephardic Province (Iberia, North Africa) and associated vertebrate faunas confirm transgression from the north. Similar conclusions are drawn for the Carnian and Norian transgressions. The improved geochronologic understanding enabled a reconstruction of the structural phases of the Jilh geohistory in four steps from Anisian to Norian, showing the relationships of retrogradation-progradation processes and tectonic pulses to hiatuses and periods of erosion. A synthetic sequence stratigraphy is proposed.
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页码:99 / 135
页数:37
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