| Reference Type | Journal (article/letter/editorial) |
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| Title | Paleomagnetism of the Mississippi Valley-type ores and host rocks in the northern Arkansas and Tri-State districts |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Pan, H. | Author |
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| Symons, D. T. A. | Author |
| Sangster, D. F. | Author |
| Year | 1990 (July 1) | Volume | 27 |
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| Issue | 7 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e90-095Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 480960 | Long-form Identifier | mindat:1:5:480960:3 |
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| GUID | 0 |
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| Full Reference | Pan, H., Symons, D. T. A., Sangster, D. F. (1990) Paleomagnetism of the Mississippi Valley-type ores and host rocks in the northern Arkansas and Tri-State districts. Canadian Journal of Earth Sciences, 27 (7) 923-931 doi:10.1139/e90-095 |
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| Plain Text | Pan, H., Symons, D. T. A., Sangster, D. F. (1990) Paleomagnetism of the Mississippi Valley-type ores and host rocks in the northern Arkansas and Tri-State districts. Canadian Journal of Earth Sciences, 27 (7) 923-931 doi:10.1139/e90-095 |
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| In | (1990, July) Canadian Journal of Earth Sciences Vol. 27 (7) Canadian Science Publishing |
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| Abstract/Notes | A paleomagnetic study has been done on 452 specimens from the Early Ordovician Cotter and Middle Ordovician Everton formations in the northern Arkansas Mississippi Valley-type (MVT) lead–zinc ore district and from the Mississippian Warsaw and Keokuk formations in the Tri-State MVT district. Progressive alternating-field and thermal demagnetization first removed a steep normal modern viscous remanence component, leaving an underlying stable remanence of very low intensity (0.3 × 10−5 – 3 × 10−5 A/m). In the Tri-State area, further demagnetization of unaltered host rocks at seven sites in the Warsaw Formation yields a B component with a mean direction of declination (D) 146°, inclination (I) 14 °(A95 = 13°), corresponding to a paleopole of 130°E, 31°N (Dp = 7°, Dm = 14°), which is a primary Mississippian remanence. In northern Arkansas further demagnetization reveals an A component at 9 sites with a mean direction of D 156°, I 30° (A95 = 7°) and a C component at 14 sites of D 160°, I 1 °(A95 = 9°), corresponding to pole positions of 116°E, 33°N (Dp = 4°, Dm = 8°) and 119°E, 49°N (Dp = 4°, Dm = 9°), respectively. Almost all of the A-component sites are from unmineralized dolomite, whereas all of the C-component sites are from mineralized locations. This correlation suggests that the A magnetization is related to Late Devonian secondary dolomitization and the C magnetization to Permian mineralization produced by brines migrating from the Arkom basin upon deformation and uplift during the Ouachita orogeny. |
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