Meurer, William P; Gee, Jeff S (2002): Mineraly of oceanic crust from the Kane Transform, Mid-Atlantic Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.710916, Supplement to: Meurer, WP; Gee, JS (2002): Evidence for the protracted construction of slow-spread oceanic crust by small magmatic injections. Earth and Planetary Science Letters, 201(1), 45-55, https://doi.org/10.1016/S0012-821X(02)00660-X
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Abstract:
Gabbroic cumulates drilled south of the Kane Transform Fault on the slow-spread Mid-Atlantic Ridge preserve up to three discrete magnetization components. Here we use absolute age constraints derived from the paleomagnetic data to develop a model for the magmatic construction of this section of the lower oceanic crust. By comparing the paleomagnetic data with mineral compositions, and based on thermal models of local reheating, we infer that magmas that began crystallizing in the upper mantle intruded into the lower oceanic crust and formed meter-scale sills. Some of these magmas were crystal-laden and the subsequent expulsion of interstitial liquid from them produced '”cumulus” sills. These small-scale magmatic injections took place over at least 210 000 years and at distances of ~3 km from the ridge axis and may have formed much of the lower crust. This model explains many of the complexities described in this area and can be used to help understand the general formation of oceanic crust at slow-spread ridges.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 23.540700 * Median Longitude: -45.031450 * South-bound Latitude: 23.538800 * West-bound Longitude: -45.031600 * North-bound Latitude: 23.542600 * East-bound Longitude: -45.031300
Date/Time Start: 1993-12-26T10:38:00 * Date/Time End: 1994-01-13T02:45:00
Event(s):
153-921E * Latitude: 23.538800 * Longitude: -45.031300 * Date/Time Start: 1993-12-26T10:38:00 * Date/Time End: 1993-12-29T11:02:00 * Elevation: -2456.0 m * Penetration: 82.6 m * Recovery: 17.65 m * Location: South Atlantic Ocean * Campaign: Leg153 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 82.6 m cored; 0 m drilled; 21.4 % recovery
153-923A * Latitude: 23.542600 * Longitude: -45.031600 * Date/Time Start: 1994-01-07T17:27:00 * Date/Time End: 1994-01-13T02:45:00 * Elevation: -2440.0 m * Penetration: 70 m * Recovery: 40.03 m * Location: South Atlantic Ocean * Campaign: Leg153 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 53.6 m cored; 0 m drilled; 74.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Meurer, WP; Gee, JS (2002): (Table 1) Mineralogy of oceanic crust from ODP Hole 153-921E. https://doi.org/10.1594/PANGAEA.710914
- Meurer, WP; Gee, JS (2002): (Table 1) Mineralogy of oceanic crust from ODP Hole 153-923A. https://doi.org/10.1594/PANGAEA.710915