Autunian age constrained by fold tests for paleomagnetic data from the Mezarif and Abadla basins (Algeria) |
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| Affiliation: | 1. Energy and Mineral Resources Group (EMR), Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, Lochnerstraße 4-20, 52056 Aachen, Germany;2. State Key Laboratory of Petroleum Resources and Prospecting, 102249 Beijing, China;3. College of Geosciences, China University of Petroleum (Beijing), 102249 Beijing, China;1. Energy and Mineral Resources Group (EMR), Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, Lochnerstr. 4-20, 52056 Aachen, Germany;2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;3. Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China;4. Institut für Geologie und Paläontologie, Westfälische-Wilhelms-Universität Münster, Corrensstr. 24, D-48149 Münster, Germany;1. Accumulation and Development of Unconventional Oil and Gas, State Key Laboratory Cultivation Base Jointly-constructed by Heilongjiang Province and Ministry of Science and Technology, Northeast Petroleum University, Daqing 163318, China;2. Department of Applied Geosciences and Geophysics, Montanuniversitaet Leoben, Peter-Tunner-Strasse 5, 8700 Leoben, Austria;3. PetroChina Turpan-Hami Oilfield Company, Hami 839009, China |
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| Abstract: | A paleomagnetic study has been conducted on a formation dated as Autunian in the Nekheila area (31.4°N, 1.5°W) in the Mezarif basin. ChRM was thermally isolated in 117 samples from seven sites. This ChRM (D = 131.8°, I = 15.7°, k = 196, α95 = 3.8° after dip correction; corresponding pole 29.3°S, 56.4°E) is very similar to that obtained in the neighboring Abadla basin from a formation of the same age. Fold tests associated with progressive unfolding applied to the full merged data from the dated formations of these two basins clearly indicate that the magnetization acquisition predates the deformation, which is attributed to the last phase of the late-Hercynian. The magnetization in these basins is therefore primary or acquired just after deposition. For the African Apparent Polar Wander Path, the age of the paleomagnetic poles of the Autunian part is now confirmed by paleomagnetic test. |
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