Geochemistry, microfacies and diagenetic evidences for original aragonite mineralogy and open diagenetic system of Lower Cretaceous carbonates Fahliyan Formation (Kuh-e Siah area, Zagros Basin, South Iran)

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• 作者：Maryam Jamalian ; Mohammad H. Adabi
• 关键词：Geochemistry ; Microfacies ; Sedimentary environment ; Diagenesis ; Fahliyan formation ; Zagros ; Iran
• 刊名：Carbonates and Evaporites
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：30
• 期：1
• 页码：77-98
• 全文大小：9,072 KB
• 参考文献：1. Adabi MH (1996) Sedimentology and geochemistry of Upper Jurassic (Iran) and Precambrian (Tasmania) carbonates. Unpublished PhD Thesis, University of Tasmania, Australia 407 p
  2. Adabi MH (2004) A re-evaluation of aragonite versus calcite seas. Carbonates Evaporites 19:133-41 CrossRef
  3. Adabi MH (2009) Multistage dolomitization of Upper Jurassic Mozduran Formation, Kopet-Dagh Basin, NE Iran. Carbonates Evaporites 24:16-2 CrossRef
  4. Adabi MH, Asadi Mehmandosti E (2008) Microfacies and geochemistry of the Ilam Formation in the Tang-E Rashid area, Izeh, SW Iran. J Asian Earth Sci 33:267-77 CrossRef
  5. Adabi MH, Rao CP (1991) Petrographic and geochemical evidence for original aragonitic mineralogy of Upper Jurassic carbonates (Mozduran Formation), Sarakhs area Iran. Sediment Geol 72:253-67 CrossRef
  6. Adabi MH, Salehi MA, Ghabeishavi A (2010) Depositional environment, sequence stratigraphy and geochemistry of Lower Cretaceous carbonates (Fahliyan Formation), south-west Iran. J Asian Earth Sci 39:148-60 CrossRef
  7. Al-Aasm IS, Veizer J (1986) Diagenetic stabilization of aragonite and low-Mg calcite, I. Trace element in rudists. J Sediment Petrol 56:138-52 CrossRef
  8. Alavi M (2007) Structures of the Zagros fold-thrust belt in Iran. Am J Sci 307:1064-095 CrossRef
  9. Anderson TF, Arthur MA (1983) Stable isotopes of oxygen and carbon and their application to sedimentologic and paleoenvironmental problems. In: Arthur MA, Anderson TF, Kaplan IR, Veizer J, Land LS (eds) Stable isotopes in sedimentary geology, vol 10. Society of Economic Paleontologists and Mineralogists. Short Course, pp 1-51
  10. Asadi Mehmandosti E, Adabi MH (2013) Application of geochemical data as evidence of water–rock interaction in the Sarvak formation, Izeh Zone, Zagros Iran. Proced Earth Planet Sci 7:31-5 CrossRef
  11. Aubourg C, Smith B, Bakhtari H, Guya N, Eshragi A, Lallemant S, Molinaro M, Braud X, Delaunay S (2004) Post-Miocene shortening pictured by magnetic fabric across the Zagros-Makran syntaxis (Iran). Geol Soc Am 383:17-0
  12. Bachmann M, Hirsch F (2006) Lower Cretaceous carbonate platform of the eastern Levant (Galilee and the Golan Heights): stratigraphy and second-order sea-level change. Cretac Res 27:487-12 CrossRef
  13. Bahroudi A, Koyi HA (2003) Effect of spatial distribution of Hormuz salt on deformation style in the Zagros fold and thrust belt: an analogue modelling approach. J Geol Society Lond 160:719-33. doi:10.1144/0016-764902-135 CrossRef
  14. Barron EJ (1983) A warm equable Cretaceous: the nature of the problem. Earth Sci Rev 19:305-38 CrossRef
  15. Bathurst RGC (1975) Carbonate Sediments and their Diagenesis: developments in sedimentology, 12th edn. Elsevier, Amsterdam, p 658
  16. Bodzioch A (2003) Calcite pseudomorphs after evaporates from the Muschelkalk (Middle Triassic) of the Holy Cross Mountains (Poland). Geologos 7:169-80
  17. Booler J, Tucker ME (2002) Distribution and geometry of facies and early diagenesis: the key to accommodation space variation and sequence stratigraphy: upper Cretaceous Congost carbonate platform, Spanish Pyrenees. Sed Geol 146:225-47 CrossRef
  18. Bordenave ML (2003) Gas prospective areas in the Zagros domain of Iran and in the gulf Iranian waters, American Association of Petroleum Geologists, Annual Meeting, Houston, Texas, 10-2 Mar 2002
  19. Brand U, Veizer J (1980a) Chemical diagenesis of a multicomponent carbonate sys
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geology
  Earth sciences
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-5212

文摘

The Fahliyan Formation is an important reservoir unit of Cretaceous strata in the south of Iran (Zagros Mountains). This formation with the age of Lower Cretaceous overlies unconformably the Hith Formation and is conformably covered by the Gadvan Formation in the studied area. To evaluate the original carbonate mineralogy, paleotemperature, and diagenetic environment in Kuh-e Siah anticline in Boushehr Province, the Fahliyan Formation was investigated by petrographic and geochemical analyses. Petrographic studies led to the recognition of 25 microfacies that were deposited in four facies belts: tidal flat, lagoon, and shoal in inner ramp and shallow open marine in mid-ramp environment. Of these microfacies, twenty-one belong to inner ramp and four are located in the mid ramp. Calcareous algae and benthic foraminifera are abundant in the shallow-marine carbonates of the Fahliyan Formation. Evidences such as absence of calciturbidite deposits and reefal facies, the occurrence of widespread tidal flat deposits, gradual facies changes, and abundant micrites indicate that the Fahliyan Formation was deposited in a homoclinal carbonate ramp environment. Abundant aragonite skeletal and non-skeletal components and presence of dolomites in Fahliyan carbonates indicate original aragonite mineralogy. Radial ooids generated in low-energy environments similar to modern aragonitic forms. Deformed and spalled ooids as well as shattered micritic envelopes indicate aragonite dissolution during meteoric diagenesis. Isopachous and fibrous sparry calcite cements resemble modern aragonite morphologies. Micritization, geopetal fabric, bioturbation, neomorphism, compaction, cementation, dissolution, dolomitization, dedolomitization, and fracturing are diagenetic processes in the Fahliyan Formation, occurring in marine to meteoric and burial diagenetic environments. Cementation, dissolution, and dolomitization are the main diagenetic processes that affected the original texture. Values of major (Ca and Mg) and minor (Sr, Na, Fe and Mn) elements (such as high Sr value) and δ18O and δ13C designate that the Fahliyan carbonates were deposited in a shallow warm-water sub-tropical environment and aragonite was the original carbonate mineralogy. Variations of Sr/Ca and δ18O values versus Mn suggest that diagenetic alteration must have occurred in an open diagenetic system, with high water–rock interaction. Dolomitization, dissolution and cementation are the main diagenetic features observed in the Fahliyan Formation of Kuh-e Siah and confirm high water–rock interaction in open diagenetic system. Dissolution as leaching is the most important diagenetic event in the evolution of porosity, particularly where green algae and other benthic foraminifera are abundant. This may indicate that the original carbonate mineralogy of the mentioned bioclasts might be aragonite, rather than low-Mg calcite. Temperature calculation based on the oxygen isotope value of the least-altered sample, using Anderson and Arthur (Stable isotopes in sedimentary geology, vol 10. Society of Economic Paleontologists and Mineralogists. Short Course, pp 1-51, 1983) equation, indicates paleotemperature to be around 29.1?°C.