Tectonic termination of oceanic detachment faults, with constraints on tectonic uplift and mass wasting related erosion rates
نویسندگان
چکیده
New high-resolution bathymetric data from Atlantis Massif and surrounding seafloor (30°N, Mid-Atlantic Ridge) records avolcanic extension associated with the formation of axial rift valley floor, following tectonic truncation an active corrugated oceanic detachment fault system. The truncated is tectonically uplifted by a high-angle valley-bounding normal fault, formed after westward migration ridge at ∼0.4 to 0.1 Ma. Detachment remnants, preserved corrugations, lie within present-day seafloor, demonstrate that ∼20 km section in immediate vicinity Fracture zone has not recorded any recent volcanic activity. Avolcanic may thus occur locally slow-spreading Ridge, albeit for limited periods time (less than few hundred thousand years). new dissecting shows throw ∼2800 m, partly due flexural uplift. Emplacement Lost City hydrothermal site occurred late stage post-dating formation. From inferred timing axis shift we calculate uplift rates ≥ 7 mm/yr, possibly as high 33 which are equivalent or greater fastest vertical faults measured date on Earth (Gulf Corinth). Geomorphologic observations also mass wasting efficiently reworks topography. We obtain local incision erosion ≥1-2 mm/yr locally, 4-8 depending assumed age bonding (0.4 vs. Ma respectively). Our results suggest (1) 100s kyrs), (2) document shifts location related abrupt abandonment first-order process asymmetric accretion slow-spread lithosphere.
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2022
ISSN: ['1385-013X', '0012-821X']
DOI: https://doi.org/10.1016/j.epsl.2022.117449