Compaction, fracturing and cementation, the main diagenetic events: An example from upper sandstone of Lalun Formation, Binalud Zone, Iran

Document Type : مقالات پژوهشی

Author

• Mehdi Reza Poursoltani

Islamic Azad University, Mashhad

10.22067/sed.facies.v9i1.47044

Abstract

Introduction
The siliciclastic Lalun Strata (Early Cambrian), in the Binalud zone, with thickness of 70 metres in the Chenar area, rests with an fault contact on the Early Cambrian sedimentary rocks (Soltaniyeh dolomite). This strata overlain with erosional surface by Eocene conglomerates. The upper part of this strata contains sandstone that compare with upper sandstone unit of other parts (Porsoltani et al., 2014; Poursoltani and Ghotbi Ravandi, 2015). This formation is red to reddish-brown in color, and mostly purple. The one stratigraphic section was logged graphically, and 67 fresh sandstone samples were systematically collected, and 50 thin sections were made. Petrographic modal analyses were done using a Nikon Eclipse E400 Pol microscope, with 500 point counts on 20 samples. Four polished thin sections were studied to determine the composition of mineral components. The Scanning Electron Microscope (SEM) used was a LEO 1450 VP at an acceleration voltage of 30.00 kv.

Discussion
Based on field and laboratory studies, two facies association including sandstone and shale have been identified. The sandstones are fine- to medium-grained and grain-supported, with some coarse-grained and well-rounded components. Based on angularity, sorting, and matrix content, most sandstones are mature and submature. Detrital grains are quartz, predominantly monocrystalline quartz with subordinate polycrystalline quartz, K-feldspar and plagioclase, lithic grains, and accessory minerals and micas. Lithic grains are mainly metamorphic (quartzite) and sedimentary (sandstone and chert), with a few volcanic grains. Heavy minerals include opaques, zircon and tourmaline, scattered or present as a thin laminae. The sandstones have a compositional range from quartzarenite to subarkose and sublitharenite (Folk, 1980).

Results
The Lalun sandstones experienced diagenetic events that included compaction, fracturing and cementation. The predominant cement is silica, but some samples contain considerable proportions of carbonate, iron oxides and clays cements, with minor authigenic minerals. The silica is typically non-luminescent, and mainly occurs as syntaxial overgrowths on detrital quartz grains; reddish rims of very fine-grained material that probably include clay and iron oxides mark the contacts between authigenic and detrital quartz. Silica also forms pore-filling cement in primary pores, and large volumes of cement lie along primary and secondary fractures (McBride, 1989; Friis et al., 2010). The cements occupy inter- and intragranular spaces, form veins and fill fractures, and vary from microcrystalline to coarsely crystalline in the case of calcite. Iron oxide cement is present throughout the Lalun Formation as an alteration product and cement. Clay minerals present less than other type of cements, but illite and kaolinite are the main clay minerals cement in Lalun sandstones (Ketzer et al., 2005). Dissolution is prominent in the sandstones. Detrital K-feldspar, quartz, volcanic rock fragments, and carbonate cement all show evidence of partial to complete dissolution. In feldspars, the proportion of voids is variable, with dissolution prominent along cleavages and fractures. The sandstones show variable degrees of mechanical and chemical compaction, which is particularly prominent where early cements are lacking (Mansurbeg et al., 2008). Grain contacts include elongate and concavo-convex, point contacts in rare cases, and sutured contacts that indicate intergranular pressure solution and deformation at a more advanced stage. Quartz and feldspar grains have been intensively fractured but the fractures have been largely healed through silica cementation, allowing the grains to maintain their integrity (Milliken, 1989; Dickinson and Milliken, 1995). This was evident using SEM and CL techniques, which show that the majority of grains contain fractures. Based on petrological and geochemical studies, it is interpreted that diagenetic history of the Lalun sandstones can be related to early, deep burial and late stages (Abdel Wahab, 1998; Salem et al., 2005).

Conclusion
Based on petrogragpic studies of upper sandstone units of the Lalun Formation, in Binalud Zone, compaction, fracturing and cementation (mainly silica) are the most important diagentic events of these sandstones. The cements occupy inter- and intragranular spaces, form veins and fill fractures, and vary from microcrystalline to coarsely crystalline. The sandstones show variable degrees of mechanical and chemical compaction, which is particularly prominent where early cements are lacking. Quartz and feldspar grains have been intensively fractured but the fractures have been largely healed through silica cementation, allowing the grains to maintain their integrity. According to diagenetic events, diagenetic history for the Lalun sandstones, in study area, is related to early, deep burial and late stages.

Keywords: Diagenesis; Lalun Formation; Early Cambrian; Binalud.

Reference
Abdel Wahab, A., 1998. Diagenetic history of Cambrian quartzarenites, Ras Dib-Zeit Bay area, Gulf of Suez, eastern desert, Egypt. Sedimentary Geology, 121: 121-140.
Dickinson, W.W., & Milliken, K.L., 1995. The diagenetic role of brittle deformation in compaction and pressure solution, Etjo sandstone, Nomibia. The Journal of Geology, 103: 339-347.
Folk, R.L., 1980. Petrology of Sedimentary Rock. Hemphill Publishing Co., Texas, 182 p.
Friis, H., Sylvestersen, R.L., Nebel, L.N., Poulsen, M.L.K., & Svendsen, J.B., 2010. Hydrothermally influenced cementation of sandstone-An example from deeply buried Cambrian sandstones from Bornholm, Denmark. Sedimentary Geology, 227: 11-19.
Ketzer, J.M., De Ross, L.F., & Norberto, D., 2005. Kaolinitic meniscus bridges as an indicator of early diagenesis in Nubian sandstone, Sinai, Egypt-discussion. Sedimentology, 52: 3213-217.
Mansurbega, H., Morada, S., Salemc, A., Marfild, R., El-ghalie, M.A.K., Nystuenf, J.P., Cajad, M.A., Amorosig, A., Garciah, D., & La Iglesia, A., 2008. Diagenesis and reservoir quality evolution of palaeocene deep-water, marine sandstones, the Shetland-Faroes Basin, British continental shelf. Marine and Petroleum Geology, 25: 514-543.
McBride, E.F., 1989. Quartz cement in sandstones: A review. Earth–Science Reviews, 26: 69-112.
McBbride, E.F., Land, L.S., & Mack, L.E., 1987. Diagenesis, Norphler Formation (Upper Jurassic), Rankin County, Mississippi, and Mobile County, Alabama. American Association of Petroleum Geologists Bulletin, 71: 1019-1034.
Milliken, K.L., 1989. Petrography and composition of authigenic feldspars, Oligocene Frio Formation, South Tesax. Journal of Sedimentary Petrology, 59: 361-374.
Poursoltani, M.R., Gibling, M.R., & Pe-Piper, G., 2014. Petrography analyses of Lower Cambrian sandstones from central Iran. The Atlantic Geoscience Society, 40th Colloquium and Annual Meeting, Canada, 38-39.
Poursoltani, M.R., & Ghotbi Ravandi, M.R., 2015. Diagenetic history of Early Cambrian sandstones, at Gazouieyeh outcrop, Central Iran. Stratigraphy and Sedimentology Researches, 4: 103-125
Salem, A.M., Ketzer, J.M., Morad, S., Rizk, R.R., & Al-Aasm, I. S., 2005. Diagenesis and Reservoir-Quality evolution of incised-valley sandstones: Evidence from the Abu Madi Gas Reservoirs (Upper Miocene), The Nile Delta Basin, Egypt. Journal of Sedimentary Research, 75: 572-584.

Keywords

• diagenesis
• Lalun Formation
• Early Cambrian
• Binalud

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References

آقانباتی، س.ع.، 1383. زمین‌شناسی ایران. سازمان زمین‌شناسی و اکتشافات معدنی کشور، 586 ص.

پورسلطانی، م.ر.، قطبی راوندی، م.ر.، 1393. تاریخچه دیاژنز رسوبات کامبرین زیرین در رخنمون گزوئیه، ایران مرکزی. پژوهش‌های چینه‌نگاری و رسوب شناسی، 4: 103-125.

درویش زاده، ع.،1380. زمین شناسی ایران. نشر دانش امروز، 901 ص.

شهرابی، م.، داود زاده، م.، 1365. نقشه زمین شناسی چهارگوش 250000 : 1 مشهد. سازمان زمین شناسی و اکتشافات معدنی کشور.

نبوی، م.ح.، 1355. دیباچه‌ای بر زمین شناسی ایران. سازمان زمین‌شناسی و اکتشافات معدنی کشور. 109 ص.

Abdel Wahab, A., 1998. Diagenetic history of Cambrian quartzarenites, Ras Dib-Zeit Bay area, Gulf of Suez, eastern desert, Egypt. Sedimentary Geology, 121: 121-140.

Alavi, M., 1991. Sedimentary and Structural Characteristics of the paleotethys remnants in northeastern Iran. Geological Society of America Bulletin, 103: 983-992.

Alavi, M., 1992. Thrust Tectonic of the Binalood Region, NE Iran. Tectonics, 11: 360-370.

Baron, M., & Parnell, J., 2007. Relationships between stylolites and cementation in sandstone reservoirs: Examples from the North Sea, U.K. and East Greenland. Sedimentary Geology, 194:17-35.

Bennett, P., & Siegel, D.I., 1987. Increased solubility of quartz in water due to complexing by organic comounds. Nature, 326: 684-686.

Boles, J.R., & Franks, S.G., 1979. Clay diagenesis in Wilcox sandstone of southwest Texas: implications of smectite diagenesis on sandstone cementation. Journal of Sedimentary Petrology, 49: 55-70.

Boggs, S.J., 1992. Petrology of Sedimentary Rocks. Macmillan Publishing Co., New York, 596 p.

Berner, R.A., 1977. Mechanism of feldspar weathering: some observational evidence. Geology, 5: 369-372.

Dickinson, W.W., & Milliken, K.L., 1995. The diagenetic role of brittle deformation in compaction and pressure solution, Etjo sandstone, Nomibia. The Journal of Geology, 103: 339-347.

Eren M., & Kadir S., 2013. Colour origin of red sandstone beds within the Hüdai Formation (Early Cambrian), Aydıncık (Mersin), southern Turkey. Turkish Journal of Earth Sciences, 22: 563-573.

Folk, R.L., 1980. Petrology of Sedimentary Rock. Hemphill Publishing Co., Texas, 182 p.

Friis, H., Sylvestersen, R.L., Nebel, L.N., Poulsen, M.L.K., & Svendsen, J.B., 2010. Hydrothermally influenced cementation of sandstone-An example from deeply buried Cambrian sandstones from Bornholm, Denmark. Sedimentary Geology, 227: 11–19.

Gazzi, P., 1966. Learenariedelfly schsopracretaceodell’ Appenninomodenese; correlazioni con ilflysch di Monghidoro. Mineralogy Petrography Acta, 12: 69–97.

Goldstein, R.H., & Rossi, C., 2002. Recrystallization in quartz overgrowths. Journal of Sedimentary Research, 72: 432-440.

Hartmann, B.H., Ramseyer, K., & Matter, A., 2000. Diagenesis and pore-water evolution in Permian sandstones, Gharif Formation, Sultana of Oman. Journal of Sedimentary Research, 70: 533-544.

Ketzer, J.M., De Ross, L.F., & Norberto, D., 2005. Kaolinitic meniscus bridges as an indicator of early diagenesis in Nubian sandstone, Sinai, Egypt-discussion. Sedimentology, 52: 3213-217.

Kim, Y., & Lee, Y.I., 2003. Diagenesis of shallow marine sandstones, the Lower Ordovician Dongjeom Formation, Korea: response to relative sea-level changes. Journal of Asian Earth Sciences, 23: 235-245.

Lander, R.H., Larese, R.E., & Bonell, L.M., 2008. Toward more accurate quartz cement models: the importance of euhedral versus noneuhedral growth rates. American Association of Petroleum Geologists Bulletin, 92: 1537–1563.

Liu, K.W., 2002. Deep-burial diagenesis of the siliciclastic Ordovician Natal Group, South Africa. Sedimentary Geology, 154: 177-189.

Mansurbega, H., Morada, S., Salemc, A., Marfild, R., El-ghalie, M.A.K., Nystuenf, J.P., Cajad, M.A., Amorosig, A., Garciah, D., & La Iglesia, A., 2008. Diagenesis and reservoir quality evolution of palaeocene deep-water, marine sandstones, the Shetland-Faroes Basin, British continental shelf. Marine and Petroleum Geology, 25: 514–543.

McBride, E.F., 1989. Quartz cement in sandstones: A review. Earth–Science Reviews, 26: 69 – 112.

McBbride, E.F., Land, L.S., & Mack, L.E., 1987. Diagenesis, Norphler Formation (Upper Jurassic), Rankin County, Mississippi, and Mobile County, Alabama. American Association of Petroleum Geologists Bulletin, 71: 1019-1034.

Milliken, K.L., 1989. Petrography and composition of authigenic feldspars, Oligocene Frio Formation, South Tesax. Journal of Sedimentary Petrology, 59: 361–374.

Molenaar, N., Cyziene, J., & Sliaupa, S., 2007. Quartz cementation mechanisms and porosity variation in Baltic Cambrian sandstones. Sedimentary Geology, 195: 135-159.

Ochoa, M., Arribas, J., Mas, R., & Goldstein, R.H., 2007. Destruction of a fluvial reservoir by hydrothermal activity (Cameros Basin, Spain). Sedimentary Geology, 202: 158–173.

Poursoltani, M.R., & Gibling, M.R., 2011. Composition, porosity and reservoir potential of the Middle Jurassic Kashafrud Formation, northeast Iran. Marine and Petroleum Geology, 28: 1094-1110.

Poursoltani, M.R., Gibling, M.R., & Pe-Piper, G., 2014. Petrography analyses of Lower Cambrian sandstones from central Iran. The Atlantic Geoscience Society, 40th Colloquium and Annual Meeting, Canada, 38-39.

Salem, A.M., Ketzer, J.M., Morad, S., Rizk, R.R., & Al-Aasm, I. S., 2005. Diagenesis and Reservoir-Quality evolution of incised-valley sandstones: Evidence from the Abu Madi Gas Reservoirs (Upper Miocene), The Nile Delta Basin, Egypt. Journal of Sedimentary Research, 75: 572-584.

Sawatzky, C.C., & Pe-Piper, G., 2013. Detrital quartz sources in the Scotian Basin, eastern Canada, using hot-cathode cathodoluminescence: Availability of coarse-grained sand for reservoirs. American Association of Petroleum Geologists Bulletin, 9807: 1503-1520.

Siebert, R.M., Moncure, G.K., & Lanhann, R.W., 1984. A theory of framework grain dissolution in sandstones, In: Clastic Diagenesis (Ed, D. A. McDonald and R. C. Surdan). Tulsa. Oklahama. U.S.A. American Association of Petroleum Geologists Memoir, 37: 163-176.

Schmid, S., Worden, R.H., & Fisher, Q.J., 2004. Diagenesis and reservoir quality of the Sherwood Sandstone (Triassic), Corrib Field, Slyne Basin, west of Ireland. Marine and Petroleum Geology, 21: 299-315.

Schmidt, V., & McDonald, D.A., 1979. The role of secondary porosity in the course of sandstone diagenesis. In: Scholle, P.A., Schluger, P.R. (Eds.), Aspects of Diagenesis. SEPM, Special Publication, 26: 175-207.

Stocklin, J., 1968. Structural history and tectonics of Iran; a review. American Association of Petroleum Geologists Bulletin, 52 (7): 1229-1258.

Tucker, M.E., 2001. Sedimentary Petrology: An Introduction to the Origin of Sedimentary Rocks, 2nd edition. Blackwell Scientific Publication, London, 262p.

Zhang, B., Zhang, J., Yan, S., Gu, Z., & Wang, X., 2012. Detrital quartz and quartz cement in Upper Triassic reservoir sandstones of the Sichuan basin: Characteristics and mechanisms of formation based on cathodoluminescence and electron backscatter diffraction analysis. Sedimentary Geology, 267-268: 104–114.

Zhang, B., Yan, S., Gu, Z., & Zhang, J., 2013. SEM/EBSD analysis of quartz cementation and compaction microstructures during diagenesis of sandstone. Science China: Earth Sciences, 56 (8): 1281–1293.