| Abstract: | Cores from the Smoky Hill Chalk Member of the Cretaceous Niobrara Formation have several zones containing authigenic kaolinite as spherical, moldic, polycrystalline aggregates that occur within single or multichambered foraminiferal tests and are commonly associated with framboidal pyrite. Such kaolinite is inferred to result from volcanic ash deposited during chalk sedimentation. Shortly after burial, a colloidal aluminous gel or solution formed from the unstable ash and moved into organic-rich foraminiferal tests, where sulfate-reducing bacteria created a favorable microenvironment for the simultaneous crystallization of kaolinite and pyrite. -Author |
| Genre: | Article |
| ProdID: | 70012148 |
| Citation Author: | Pollastro, R. M. |
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| Citation End Page: | 562 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Sedimentary Petrology |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Authigenic kaolinite and associated pyrite in chalk of the Cretaceous Niobrara Formation, Eastern Colorado.; 1981; Article; Journal; Journal of Sedimentary Petrology; Pollastro, R. M. |
| Citation Start Page: | 553 |
| Citation Volume: | 51 |
| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | Authigenic kaolinite and associated pyrite in chalk of the Cretaceous Niobrara Formation, Eastern Colorado.; 1981; Article; Journal; Journal of Sedimentary Petrology; Pollastro, R. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1981 00:00 -0600 |
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