Clay and shaly claystones in the Upper Triassic Siliceous sponge-microbe reef mounds and oolitic bank complex in NW Sichuan, China
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Abstract
The Upper Triassic Carnian siliceous sponge-microbe reef mounds and oolitic bank complex is located in the northwestern part of Sichuan province, China. The Carnian hexactinellid-thrombolite reef mound tract and its underlying oolitic bank were developed in a deeper marine gulf. The oolitic bank overlain by a bioclastic bank, corresponding to the Lower Carnian served as the foundation for growth of the reef mounds. The reef mounds, inter-mound strata and caprocks correspond to the Upper Carnian. There are some occurrences of clay and claystones in the reef mound–bank complex. The reef mounds contain a certain ratio of clay content. The clay content in reef mounds is originated from the turbid and muddy water in the Carnian gulf. It is conjectured that alive siliceous sponges preferred to grow in marine water with more silica content to be supplied to their skeletons, and that thrombolite preferentially dwelt in marine water containing a certain content of clayey mud with more organic matter, for cyanobacteria were heterotrophs in Mesozoic. The inter-mound and caprock facies consist mostly of claystones. There exist clay-filling neptunian dikes, karstic clay, and fault clay. Most of the clay is originated from claystone coating of the reef mounds, and fault clay is caused by earthquake.
Keywords
Carnian siliceous sponge-microbe reef mounds Oolitic bank Neptunian dikes Karstic clay Fault clay Sichuan ChinaReferences
- Aitken JD (1967) Classification and environmental significance of cryptalgal limestones and dolomites, with illustrations from the Cambrian and Ordoviciian of southwestern Alberta. J Sed Petrol 37:1163–1178Google Scholar
- Boardman MR, Cindy C (1991) Origin and accumulation of lime mud in ooid tidal channels, Bahamas. J Sed Petrol 61(5):661–680Google Scholar
- Brunton FR, Dixon OA (1994) Siliceous sponge-microbe biotic associations and their recurrence through the phanerozoic as reef mound constructors. Palaios 2:370–387CrossRefGoogle Scholar
- Carozzi AV (1962) Cerebroid oolites. Trans Illinois State Acad Sci 55(3–4):238–249Google Scholar
- Cozzi A (2000) Synsedimentary tensional features in Upper Triassic shallow-water platform carbonates of the Carnian Prealps (northern Italy) and their importance as palaeostress indicators. Basin Res Oxford (Blackwell) 12:133–146CrossRefGoogle Scholar
- Dill RF (1991) Subtidal stromatolites, ooids and crusted mud beds at the Great Bahama bank margin. In: Osborne RH (ed) From shoreline to abyss: contributions in marine geology in honor of Francis Parker Shepard. Society for Sedimentary Geology Special Publication, USA, pp 147–171Google Scholar
- Dill RF, Steinen RP (1988) Deposition of carbonate mud beds within high-energy subtidal sand dunes, Bahamas. Geological Society of America Abstracts with Program, vol 20, pp 78–79Google Scholar
- Dill RF, Shinn EA, Jones AT, Kelly K, Steinen RP (1986) Giant subtidal stromatolites forming in normal salinity waters. Nature 324:55–58CrossRefGoogle Scholar
- Fischer AG (1964) The Lofer cyclothems of the Alpine Triassic. In: Merriam DF (ed) Symposium on cyclic sedimentation. Kansas Geol Surv Bull 169:107–149Google Scholar
- Flügel E (2004) Microfacies of carbonate rocks―analysis, interpretation and application. Springer, BerlinGoogle Scholar
- Friedel CH (1995) Partikelgenese und Diagenese des Schaumkalks von Rüdersdorf (Trias, Unterer Muschelkalk). Berliner Geowiss Abh, Berlin A 168:191–217Google Scholar
- Gomez JJ, Fernandez-Lopez S (1994) Condensation processes in shallow platforms. Sed Geol 92:147–159CrossRefGoogle Scholar
- Graf DL, Lamar JE (1960) Petrology of Fredonia oolite in Southern Illinois. Bull Am Assoc Petrol Geol 34:2318–2336Google Scholar
- Halley RB, Harris PM, Hine AC (1983) Bank margin environment. In: Scholle PA (ed) Carbonate depositional environment. American Association of Petroleum Geologists Memoir, vol 33, pp 464–506Google Scholar
- Harris PM (1979) Facies anatomy and diagenesis of a Bahamian ooid shoal: Sedimenta VII. Comparative Sedimentology Laboratory, University of Miami, MiamiGoogle Scholar
- Krautter M, Conway KW, Barrie JV (2006) Recent hexactinosidan sponge reefs (silicate mounds) off British Columbia, Canada: frame-buildings processes. J Paleont 80(1):38–48CrossRefGoogle Scholar
- Lehner BL (1991) Neptunian dykes along a drowned carbonate platform margin: an indication for recurrent extensional tectonic activity? Terra Nova 3:593–602CrossRefGoogle Scholar
- Lehrmann DJ, Wei JY, Enos P (1998) Controls on facies architecture of a large Triassic carbonate platform: the Great Bank of Guizhou, Nanpanjiang Basin, South China. J Sed Res 68(2):311–326Google Scholar
- Leinfelder RR (2001) Jurassic reef ecosystems. In: Stanley GD Jr (ed) The history and sedimentology of ancient reef systems. Kluwer Acadimic/Plenum Publishers, New York, pp 251–309CrossRefGoogle Scholar
- Li ZJ, Chen LY, Zhang W, Jia J, You JW, Cao QY (2009) Research and application of drilling fluid system for fault gouge section of the hole WFSD-1 of Wenchuan earthquake fault scientific drilling project. Explor Eng 36(12):13–15, 19Google Scholar
- Major RP, Bebout DG, Harris PM (1996) Recent evolution of a Bahamian ooid shoal: effects of Hurricane Andrew. GSA Bull 108(2):168–180CrossRefGoogle Scholar
- Martire L (1996) Stratigraphy, facies and synsedimentary tectonics in the Jurassic Rosso AmmoniticoVeronese (Altopiano di Asiago, NE Italy), Facies, vol 35, pp 209–236Google Scholar
- Popp BN, Wilkinson BH (1983) Holocene lacustrine ooids from Pyramid Lake, Nevada. In: Peryt TM (ed) Coated grains. Springer, Berlin, pp 142–153Google Scholar
- Shinn EA, Steinen RP, Dill RF, Richard PM (1993) Lime-mud layers in high-energy tidal channels: a record of hurricane deposition. Geology 21:603–606CrossRefGoogle Scholar
- Vennin E (2007) Coelobiontic communities in Neptunian fissures of synsedimentary tectonic origin in Permian reef, southern Urals, Russia. In: Alvaro JJ (ed) Palaeozoic reefs and bioaccumulations climatic and evolutional controls. Geological Society, London, pp 211–227. (Special Publications)Google Scholar
- Wendt J, Wu XC, Reinhardt J (1989) Deep water hexactinellid sponge mounds from the Upper Triassic of NW Sichuan (China). Palaeogeo Palaeoclimat Palaeoecol 76:17–29CrossRefGoogle Scholar
- Wu XC (1984) Paleoecological characteristics of Late Triassic sponge patch reefs in northwestern Sichuan, China. J Chengdu Colleg Geol 43–54Google Scholar
- Wu XC (1989) Carnian (Upper Triassic) sponge mounds of the northwestern Sichuan basin, China: stratigraphy, facies and paleoecology. Facies 21:171–188CrossRefGoogle Scholar
- Wu XC (2009) Sedimentary facies analysis of the Late Triassic Carnian siliceous sponge reef-oolitic bank complex in northwestern Sichuan province. J Palaeogeogr 11:125–142Google Scholar
- Wu XC, Li PH (2011) Study proceedings of the National Geopark of Organic Reefs in An County, Sichuan. In: Symposium of 26th annual meeting of tourism geoscience and geopark society of China geological survey (in press)Google Scholar
- Wu XC, Liu SG (2008) Sedimentary facies of Maantang Formation. In: Liu SG, Wu XC, Zhao XF, Yang RJ, Peng JS (eds) Program report on the Upper Triassic organic reefs and their oil–gas geological conditions in western part of Sichuan basin, Southern Exploration and Development Division Company of SINOPEC, pp 75–119Google Scholar
- Wu XC, Reinhardt J (1987) Characteristics of the Late Triassic Carnian carbonate buildups in NW Sichuan. Symposium of 1st congr of oil and gas reservoir of organ reef, China. Explor Exploit Nat Gas 38:43–53Google Scholar
- Wu XC, Zhang LJ (1982) Late Triassic (Carnian) sponge patch reefs in northwestern Sichuan basin. Scientia Geol Sinica 4:379–385Google Scholar
- Wu XC, Zhang LJ (1983) Lithological features of the Late Triassic sponge patch reef complex in northwestern Sichuan, China. Miner Rock 3(4):59–67Google Scholar
- Wu XC, Zhang LJ, Zhu YM (1977) Discovery of Upper Triassic organic reefs in front of Longmen mountains in NW Sichuan. Sci Techn Inform Petrol Geol 30:62–82Google Scholar
- Wu XC, Zhang LJ, Zhu YM (1979) Discovery of Upper Triassic organic reefs in front of Longmenshan mountains of NW Sichuan, China. J Petrol Inst Minist Geol Miner Res 23:82–96Google Scholar
- Wu XC, Bei F, Zhang LJ (1985) Evaluation of petroleum potential of Upper Triassic sponge patch reefs in northwestern Sichuan. Exp Petrol Geol 7(2):98–106Google Scholar
- Yang RJ, Liu SG, Wu XC (2010) Distribution and formation mechanism of lime mudstone in Upper Triassic in northwestern Sichuan, China. Carbonates Evaporites 25:275–281CrossRefGoogle Scholar