Difference between revisions of "Agglutinated microfossils"
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| part = Predicting the occurrence of oil and gas traps | | part = Predicting the occurrence of oil and gas traps | ||
| chapter = Applied paleontology | | chapter = Applied paleontology | ||
| − | | frompg = 17- | + | | frompg = 17-8 |
| − | | topg = 17- | + | | topg = 17-8 |
| author = Robert L. Fleisher, H. Richard Lane | | author = Robert L. Fleisher, H. Richard Lane | ||
| link = http://archives.datapages.com/data/specpubs/beaumont/ch17/ch17.htm | | link = http://archives.datapages.com/data/specpubs/beaumont/ch17/ch17.htm | ||
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| − | Agglutinated, or arenaceous, microfossils have tests (shells) constructed from sedimentary particles bound together by organic, calcareous, siliceous, or ferruginous cement. There is only one type of stratigraphically significant agglutinated microfossil: agglutinated, or arenaceous, foraminifera. | + | Agglutinated, or [http://www.oxforddictionaries.com/us/definition/american_english/arenaceous arenaceous], microfossils have tests (shells) constructed from sedimentary particles bound together by organic, calcareous, siliceous, or ferruginous cement. There is only one type of stratigraphically significant agglutinated microfossil: agglutinated, or arenaceous, foraminifera. |
==Agglutinated foraminifera== | ==Agglutinated foraminifera== | ||
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| − | + | [[file:applied-paleontology_fig17-4.png|300px|thumb|{{figure number|1}}Typical agglutinated foraminifera.]] | |
| − | [[ | + | Agglutinated foraminifera are [[benthic]] microfossils found in rocks of [[Cambrian]] through [[Holocene]] age and in most marine and brackish environments, particularly in clastic facies. They construct their tests by gluing sedimentary grains together, in contrast to the other types of foraminifera, which secrete their tests. The sedimentary particles used by these forms may include silt or sand grains, [[glauconite]], [[sponge spicule]]s, or even other foraminiferal tests. Some species are highly selective in the material used and in its arrangement. |
| − | The color of agglutinated foraminifera has recently been shown to alter irreversibly with heating, both naturally within buried sediments and experimentally | + | Although they are sometimes useful in [[Biostratigraphic correlation and age determination|age determination]], agglutinated foraminifera are especially valuable as paleoenvironmental indicators because they are particularly characteristic of very shallow marine to brackish environments and very deep marine environments. Recent studies by Alve and Murray<ref name=ch17r2>Alve, E., and J. W. Murray, 1995, Experiments to determine the origin and palaeoenviron-mental significance of agglutinated foraminiferal assemblages, in M. A. Kaminski, S. Geroch, and M. A. Gasiński, eds., Proceedings of the Fourth International Workshop on Agglutinated Foraminifera: Grzybowski Foundation Special Publication 3, p. 1–11.</ref> and Kaminski and Kuhnt<ref name=ch17r50>Kaminski, M. A., and W. Kuhnt, 1995, Tubular agglutinated foraminifera as indicators of organic carbon flux, in M. A. Kaminski, S Geroch, and M. A. Gasiński, eds., Proceedings of the Fourth International Workshop on Agglutinated Foraminifera: Grzybowski Foundation Special Publication 3, p. 141–144.</ref> suggest they may be useful in interpreting other paleoenvironments as well. Agglutinated foraminifera are the dominant and distinctive microfauna in [[Cretaceous]] and [[Tertiary]] [[flysch]] facies. |
| + | |||
| + | The [[Thermal_maturation#Other_microfossils|color]] of agglutinated foraminifera has recently been shown to alter irreversibly with heating, both naturally within buried sediments and experimentally. | ||
[[:file:applied-paleontology_fig17-4.png|Figure 1]] shows some typical agglutinated foraminifera. | [[:file:applied-paleontology_fig17-4.png|Figure 1]] shows some typical agglutinated foraminifera. | ||
==See also== | ==See also== | ||
| − | |||
* [[Microfossils in exploration]] | * [[Microfossils in exploration]] | ||
* [[Calcareous microfossils]] | * [[Calcareous microfossils]] | ||
* [[Siliceous microfossils]] | * [[Siliceous microfossils]] | ||
* [[Phosphatic microfossils]] | * [[Phosphatic microfossils]] | ||
| − | * [[ | + | * [[Palynomorphs (organic-walled microfossils)]] |
==References== | ==References== | ||
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[[Category:Predicting the occurrence of oil and gas traps]] | [[Category:Predicting the occurrence of oil and gas traps]] | ||
[[Category:Applied paleontology]] | [[Category:Applied paleontology]] | ||
| + | [[Category:Treatise Handbook 3]] | ||
Latest revision as of 15:16, 31 January 2022
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Applied paleontology |
| Author | Robert L. Fleisher, H. Richard Lane |
| Link | Web page |
| Store | AAPG Store |
Agglutinated, or arenaceous, microfossils have tests (shells) constructed from sedimentary particles bound together by organic, calcareous, siliceous, or ferruginous cement. There is only one type of stratigraphically significant agglutinated microfossil: agglutinated, or arenaceous, foraminifera.
Agglutinated foraminifera
Agglutinated foraminifera are benthic microfossils found in rocks of Cambrian through Holocene age and in most marine and brackish environments, particularly in clastic facies. They construct their tests by gluing sedimentary grains together, in contrast to the other types of foraminifera, which secrete their tests. The sedimentary particles used by these forms may include silt or sand grains, glauconite, sponge spicules, or even other foraminiferal tests. Some species are highly selective in the material used and in its arrangement.
Although they are sometimes useful in age determination, agglutinated foraminifera are especially valuable as paleoenvironmental indicators because they are particularly characteristic of very shallow marine to brackish environments and very deep marine environments. Recent studies by Alve and Murray[1] and Kaminski and Kuhnt[2] suggest they may be useful in interpreting other paleoenvironments as well. Agglutinated foraminifera are the dominant and distinctive microfauna in Cretaceous and Tertiary flysch facies.
The color of agglutinated foraminifera has recently been shown to alter irreversibly with heating, both naturally within buried sediments and experimentally.
Figure 1 shows some typical agglutinated foraminifera.
See also
- Microfossils in exploration
- Calcareous microfossils
- Siliceous microfossils
- Phosphatic microfossils
- Palynomorphs (organic-walled microfossils)
References
- ↑ Alve, E., and J. W. Murray, 1995, Experiments to determine the origin and palaeoenviron-mental significance of agglutinated foraminiferal assemblages, in M. A. Kaminski, S. Geroch, and M. A. Gasiński, eds., Proceedings of the Fourth International Workshop on Agglutinated Foraminifera: Grzybowski Foundation Special Publication 3, p. 1–11.
- ↑ Kaminski, M. A., and W. Kuhnt, 1995, Tubular agglutinated foraminifera as indicators of organic carbon flux, in M. A. Kaminski, S Geroch, and M. A. Gasiński, eds., Proceedings of the Fourth International Workshop on Agglutinated Foraminifera: Grzybowski Foundation Special Publication 3, p. 141–144.
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