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Oceanic ridge off-axis deep structure in the Mansah region (Sumail massif, Oman ophiolite)

Abstract : Large scale structural mapping of the Oman ophiolite indicates that the Mansah area (Sumail massif) was a ridge off-axis region at the time the ophiolite was detached. This paper presents a detailed structural mapping of the region. We show that, as opposed to other off-axis areas, it contains plunging lineations, correlated with a thick Moho transition zone and chromite pods, indicative of a mantle diapir. However this diapir has a discontinuous structure, it is bounded by shear zones and types of diabases that are not found elsewhere in Oman; it also has a broken crust, strongly affected by hydrothermal alteration. This suggests that Mansah fossilized an off-axis diapir intruding a cooling lithosphere. It may be a good candidate to be the root of an off-axis seamount such as those found in the East Pacific, and may bring new insights into this particular volcanism which we are only beginning to explore.
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D. Jousselin, Adolphe Nicolas. Oceanic ridge off-axis deep structure in the Mansah region (Sumail massif, Oman ophiolite). Marine Geophysical Research, 2000, 21 (3/4), pp.243 - 257. ⟨10.1023/A:1026741208295⟩. ⟨hal-02378681⟩



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