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| Titel |
Sedimentary stylolite connectivity: Large-scale field observations and implications for strain and compaction |
| VerfasserIn |
Einat Aharonov, Leehee Laronne Ben-Itzhak, Zvi Karcz, Maor Kaduri, Renaud Toussaint |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250081424
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| Zusammenfassung |
| Stylolites, which constitute surfaces of localized rock dissolution and compaction, have a documented impact
on porosity and permeability, and are important for the evolution of sedimentary basins and for accomodating compactive strain. We present here a meso-scale field study on sedimentary stylolites in carbonates, characterizing large scale distributions of stylolite, including measurements conducted on more than 1 km long stylolites, the largest stylolite lateral distribution ever reported in the literature. Our field study suggests that on large-scales connections between stylolites become important both to compactive strain accomodation and to transport properties of the rocks, indicating that large-scale analysis may require a new characterization scheme for “stylolites populations” based on their connectivity. We thus divide stylolite populations into three end-member types: long-parallel stylolites (where stylolites never connect since they are parallel), interconnected stylolite networks (where stylolites connect by merging and anastamosing or via fractures and veins), and isolated stylolites (where stylolites terminate before connecting). We suggest characterizing the different populations by different statistical parameters and measures.
Using schematic mechanistic models for the evolution of the 3 end-member connectivity classes, we discuss how each of the end-member types accommodates large scale strain and how the different connectivity classes affect fluid flow. |
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