RESEARCH PROGRESS OF DATING OF AUTHEGENIC ILLITE IN SEDIMENT
Received date: 2002-02-04
Revised date: 2002-05-08
Online published: 2002-10-01
The smectite-to-illite transformation has close relation with sediment and thermal history of basins. So illite can indicate period of oil formation. Dating of authegenic illite is an important task. K/Ar method and 40Ar/39Ar method are often applied to illite dating. The contamination of detrital illite hinders the direct application of isotope ages. In order to separate authegenic illite from detrital, IAA and alkylammonium methods are performed in illite separating. Before using IAA method, the samples must be separated by size. XRD spectrum shows that the content of authegenic illite is high in fine sample and the detrital illite is the major component in coarse sample. Each ages can be obtained respectively by K/Ar method. The above ages and the percentage of detrital illite have a linear relation. Authegenic and detrital ages can be calculated by extrapolation. Alkylammonium cations method is a new way to research the diagenetic age of sedimentary rocks. Alkylammonium cations can replace K cations in mica and illite stoichiometrically. Longer chain alkylammonium and more time replace more K cations than shorter chain and less time. Moreover, HRTEM observations indicate that the process is very selective: even in apparently homogenous illite or I/S, some crystals undergo opening and some remain unchanged. And the replacement of K cations by Alkylammonium cations is not restricted to crystal edges, but extends to entire interlayer. The above are the basic of alkylammonium cations method applied to the diagenetic age of sedimentary rocks. It is generally assumed that there are no preferential removal of K and radiogenetic Ar. A common opinion is that after alkylammonium treatment, it can be inferred that detrital component are opened preferentially if K-Ar age decreases. Between diagenetic and detrital illites, alkylammonium reacts with detrital illite first. Some other approaches such as vacuum encapsulation are applied, which improve the effect of dating. Because the Argon's escape from authegenic and detrital illites need different temperatures, step heating method can separate two kinds of illites. This article briefs the present progresses of illite dating among the world.
CHE Chen,YANG Zhong-fang,JI Jun-feng . RESEARCH PROGRESS OF DATING OF AUTHEGENIC ILLITE IN SEDIMENT[J]. Advances in Earth Science, 2002 , 17(5) : 693 -698 . DOI: 10.11867/j.issn.1001-8166.2002.05.0693
［1］Burst J F. Post diagenetic clay mineral-environmental relationships in the Gulf Coast Eocene in clays and clay minerals［J］. Clays & Clay Minerals, 1959, 6: 327-341.
［2］Hower J, Eslinger E V, Hower M E,et al.Mechanism of burial metamorphism of argillaceous sediment: 1. Mineralogical and chemical evidence［J］. Geological Society America Bulletin, 1976, 87:725-737.
［3］Hoffman J, Hower J. Clay mineral assemblages as low grade metamorphic geothermometers: Application to the thrust-faulted disturbed belt of Montana, USA［A］. In: Scholle P A, Schluger,P R,eds. Aspects of Diagenesis［C］. SEPM Special, 1979, 26:55-79.
［4］Srodon J, Eberl D D. Illite in Micas［A］, In: Bailey S W ed. Reviews in Mineralogy［C］.1984, 13: 495-544.
［5］Pytte A M, Reynolds R C. The thermal transformation of smectite to illite［A］. In: Naeser N D, McCulloh T H, eds. Thermal Histories of Sedimentary Basins［C］. New York: Springer-Verlag, 1988. 133-140.
［6］Velde B, Vasseur G. Estimation of the diagenetic smectite-to-illite transformation in time-temperature space［J］. American Mineralogist, 1992, 77:967-976.
［7］Pollastro R M. Considerations and applications of the illite/smectite geothermometer in hydrocarbon-bearing rocks of Micene to Mississippian age［J］. Clays and Clay Minerals, 1993, 41:119-133.
［8］Whitney G. Role of water in the smectite-to-illite reaction［J］. Clays and Clay Minerals, 1990, 38: 343-350.
［9］Buatier M D, Peacor D R, O'Neil J R. Smectite-illite transition in Barbados accretionary wedge sediments: TEM and AEM evidence for dissolution/crystallization at low temperature. ［J］. Clays and Clay Minerals, 1992,40:65-80.
［10］Huang W L, Long J M, Pevear D R. An experimentally derived kinetic model for smectite to illite conversion and its use as a geothermometer［J］. Clays & Clay Minerals, 1993, 41:162-177.
［11］Wei H, Roaldset E, BjorØy M. Parallel reaction kinetics of smectite to illite conversion［J］. Clay Minerals, 1996, 31:365-376.
［12］Thomas M. Diagenetic sequences and K/Ar dating in Jurassic sandstones, central Viking graben: effects on reservoir properties［J］. Clay Minerals, 1986, 21: 695-710.
［13］Hamilton P J, Kelly S, Fallick A E. K-Ar dating of illite in hydrocarbon reservoirs［J］. Clay Minerals, 1989, 24: 215-231.
［14］Lee M, Aronson, J L, Savin S M. K-Ar dating of time of gas emplacement in Rotliegendes Sandstone, Netherlands［J］. AAPG Bulletin, 1985,69: 1 381-1 385.
［15］Pevear D R. Illite age analysis, a new tool for basin thermal history analysis［A］. Kharaka & Maest, eds. Water-Rock Interaction［J］. Balkema, Ortterdam.1992.
［16］Pevear D R. Illite and hydrocarbon exploration［J］. Proceeding of the Natlional Academy of Sciences of the USA,1999,96: 3 440-3 446.
［17］Srodon J. Extracting K-Ar ages from shales: a theoretical test［J］.Clay Minerals, 1999,33: 375-378.
［18］Van Der Pluijm B A, Hall C M, Vrolijk P J,et al.The dating of shallow faults in the Earth's crust［J］.Nature, 2001,412:172-175.
［19］Chaudhuri S, Srodon J, Clauer N. K-Ar dating of illitic fractions of Estonian “Blue Clay” treated with alkylammonium cations［J］. Clays and Clay Minerals,1999, 47(1): 96-102.
［20］Sears S K, Hesse R, Vali H. Significance of n-alkylammonium exchange in the study of 2:1 clay mineral diagenesis, Mackenzie Delta-Beaufort Sea region, Arctic Canada［J］. The Canadian Mineralogist,1998, 36：1 485-1 506.
［21］Sears S K, Hesse R, Vali H,et al. K-Ar ages of 2∶1 clay minerals, Mackenzie Delta-Beaufort Sea region, Arctic Canada: significance of n-alkylammonium exchange［J］. Canadian Mineral,1998,36:1 507-1 524.
［22］Gunter Faure. Principles of Isotope Geology［M］. New York: John Willy & Sons, 1993.［G.福尔著.同位素地质学原理［M］.潘曙兰,乔广生译.北京：科学出版社，1993.］
［23］Dong H L, Hall C M, Peacor D R,et al.Thermal 40Ar/39Ar separation of diagenetic from detrital illitic clays in Gulf Coast shales［J］ Earth and Planetary Science Letters, 2000, 175: 309-325.
［24］Dong H L, Hall C M, Halliday A N,et al. 40Ar/39Ar illite dating of Late Caledonian(Acadian) metamorphism and cooling of K-Bentonites and slates from the Welsh Basin, UK［J］. Earth and Planetary Science Letters,1997, 150:337-351.
［25］Dong H L, Hall C M, Halliday A N,et al.Laser 40Ar/39Ar dating of microgram-size illite samples and implications for thin section dating ［J］. Geochimica et Cosmochimica Acta，1997，61:3 803-3 808.
/
| 〈 |
|
〉 |
甘公网安备62010202000687
