رصيف جيري
الرصيف الجيري Carbonate platform ، هوهجريب بحري يتكون أساسا من كربونات الكالسيوم ، ويرتفع عن المنطقة المحيطة به.
ترسب الكربونات
التصنيف
مصانع المناطق الاستوائي
مصانع المياه الباردة
Mud-mound factory
هندسة الرصيف الجيري
الشعاب
البحيرةالداخلية
المنحدر
الرصيف الجيري في السجل الجيولوجي
معرض الصور
"Shallowing upward" cycle in the middle Lias of the high Atlas (Morocco). Algal dolomitized laminations on top.
"Shallowing upward" cycles in the lagoonal Lias of the Musandam Peninsula. (N-Oman).
"Shallowing upward" liassic cycles arranged in decametric sequences, Musandam Peninsula, (N-Oman).
"Shallowing upward" cycle in the Middle Jurassic (Saghtan form.) of the jbel Laghdar Range (Oman).
Dessication figures on top of a regressive sequence; Middle liassic, High Atlas, Morocco.
Ammonites and belemnites washed over a supratidal surface (calcretes and "teepees"); Middle Liassic of the High Atlas, Morocco.
Hurrican breccia cemented (early diagenesis) at the surface of a bed, top of a regressive, metric, sequence. Middle Lias, High Atlas.
Vadose ferrugenous pisolites (soil) and coastal (tempestite) sediment with birdseyes in an outer platform environment. Aerial diagenesis. Middle liassic, High Atlas, Morocco.
Meniscus and point contact cement in a marine grainstone with displaced foraminifera (by tide and hurricans) on the supratidal flat of the middle liassic platform of Morocco. Top of emersive cycle. Middle Atlas.
Reworked calcretes concretions from the supratidal environment in a marine (dolomitised) sediment displaced by hurricans on the inner platform flat. Top of emersive sequence. High Atlas, Morocco.
Stalactitic cement in sediment from the supratidal zone, vadose environment, top of "shallowing upward" sequence. Middle Liassic, High Atlas. Thin section. L = 0.3 mm.
Giant dinosaur tracks (sauropod) on top of a regressive sequence, Middle Liassic, High Atlas, Morocco.
Parallel dinosaurs tracks on top of a regressive sequence, Middle Liassic, High Atlas, Morocco.
Vadose stalactitic cement filling an horizontal cavity in a marine coastal sediment, outer platform. Birdseyes in the allodapic (tidal or tempestite) grainstone point to an aerial diagenesis. High Atlas, Morocco.
Autocyclic filling (metric to hectometric) sequences in the Middle Liassic lagoon, South (Todhra) of the High Atlas, Morocco.
"Teepee" structure, due to increasing sediment volume by dolomitisation on the inner platform supratidal flat. Top of emersive cycle. Middle Lias, High Atlas.
Quaternary to recent equivalent of a "shallowing upward sequence", cores in a Tunisian "chott", intertidal laminations in yellow.
Recent "teepee" structures in a Tunisian salt lagoon, "chott".
Recent equivalents of "shallowing upward sequences", cores in a Tunisian salt lagoon, "chott".
Top of a regressive sequence with algal laminations (yellow) and crystallised gypsum, salt lagoon "chott", Tunisia.
Eolian bioclastic (calcareous algae and porcellaneous foraminifera) sand dune on Tunisian shore.
انظر أيضا
- Ocean bank (topography)
- Bahama Banks
الهوامش
- ^ عبد الجليل هويدي، محمد أحمد هيكل (2004). أساسيات الجيولوجيا التاريخية. مخطة الدار العربية للخط.
المصادر
- Carannante G., Esteban M., Milliman J. D., Simone L., 1988, Carbonate lithofacies as paleolatitude indicators: problems and limitations. Sedimentary Geology, v. 60, pp. 333-346.
- Davaud E. & Septfontaine M. (1995): Post-mortem onshore transportation of epiphityc foraminifera: recent example from the Tunisian coast line.- Jour. Sediment. Research, 65/1A, 136-142.
- Schlager W., 2005, Carbonate sedimentology and sequence stratigraphy. SEPM, Tulsa, Oklahoma, 200 pp. ISBN 1-56576-116-2
- Wilson J. L., 1975, Carbonate Facies in Geologic History, Springer-Verlag, 471 pp. ISBN 3-540-07236-5
- Bosellini A., 1984, Progradation geometries of carbonate platforms: examples from the Triassic of the Dolomites, northern Italy. “Sedimentology”, v.31:1-24
- "Bahamas Introduction" (Accessed 3/8/06)
- About.com: Geologic Map of Florida (Accessed 3/8/06)
- Pinet P. R., 1996, Invitation to Oceanography. St. Paul: West Publishing Company, ISBN 0-314-06339-0
- Septfontaine M. 1985, Depositional environments and associated foraminifera (lituolids)in the middle liassic carbonate platform of Morocco.- Rev. de Micropal. 28/4 265-289. See also www.palgeo.ch/publications.