| Reference Type | Journal (article/letter/editorial) |
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| Title | Compositional Variations in Diagenetic Chlorites and Illites, and Relationships with Formation-Water Chemistry |
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| Journal | Clay Minerals |
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| Authors | Jahren, J. S. | Primary Author |
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| Aargaard, P. | Secondary Author |
| Year | 1989 | Volume | 24 |
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| Page(s) | 157-170 | Issue | 2 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/claymin.1989.024.2.04Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 563011 | Long-form Identifier | mindat:1:5:563011:4 |
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| GUID | 1768e1df-de16-4823-8e69-fd57f686cb5d |
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| Full Reference | Jahren, J. S., Aargaard, P. (1989) Compositional Variations in Diagenetic Chlorites and Illites, and Relationships with Formation-Water Chemistry. Clay Minerals, 24 (2) 157-170 doi:10.1180/claymin.1989.024.2.04 |
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| Plain Text | Jahren, J. S., Aargaard, P. (1989) Compositional Variations in Diagenetic Chlorites and Illites, and Relationships with Formation-Water Chemistry. Clay Minerals, 24 (2) 157-170 doi:10.1180/claymin.1989.024.2.04 |
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| In | (1989) Clay Minerals Vol. 24 (2) Mineralogical Society |
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| Abstract/Notes | Authigenic illites and chlorites fromelasticreservoirs,offshoreNorway,have been studied by analytical transmission electron microscopy(ATEM). Present-day reservoir conditions range from 1600m burial depth and 70~ to 4400 m and 160~ The reservoir units haveexperiencedcontinuoussubsidencesinceearlyCretaceous,and are presentlyat maximum burial. Texturaland morphologicalevidenceindicatesthat the authigenicillitesand chlorites investigated are late diagenetic products, except for an early-formed berthierine in the shallowest reservoir. While the illites show very limited chemical variability at temperatures between 140~ and 160~ the chlorites exhibit definite compositional trends with increasing temperatures. Tetrahedral Ai increases substantially from 100~176 and the octahedral vacancy decreases correspondingly. These observations indicate that continuous recrystallization ofauthigenic clays hastakenplace. Thisisalsosupportedbythechemicalcompositionof present-day porewaters, which are close to equilibrium with the clay mineral assemblage.
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