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Bryan, Wilfred B; Frey, Frederick A; Thompson, Geoffrey (1977): Chemical composition of basalts from the Atlantic Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.667495, Supplement to: Bryan, WB et al. (1977): Oldest Atlantic seafloor. Contributions to Mineralogy and Petrology, 64(2), 223-242, https://doi.org/10.1007/BF00371513

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Abstract:
Basalt recovered beneath Jurassic sediments in the western Atlantic at Deep Sea Drilling Project sites 100 and 105 of leg 11 has petrographic features characteristic of water-quenched basalt extruded along modern ocean ridges. Site 100 basalt appears to represent two or three massive cooling units, and an extrusive emplacement is probable. Site 105 basalt is less altered and appears to be a compositionally homogeneous pillow lava sequence related to a single eruptive episode. Although the leg 11 basalts are much more closely related in time to the Triassic lavas and intrusives of eastern continental North America, their geochemical features are closely comparable to those of modern Mid-Atlantic Ridge basalts unrelated to postulated "mantle plume" activity. Projection of leg 11 sites back along accepted spreading "flow lines" to their presumed points of origin shows that these origins are also outside the influence of modern" plume" activity. Thus, these oldest Atlantic seafloor basalts provide no information on the time of initiation of these "plumes". The Triassic continental diabases show north to south compositional variations in Rb, Ba, La, and Sr which lie within the range of " plume "-related basalt on the Mid-Atlantic Ridge (20° - 40° N) This suggests that these diabases had mantle sources similar in composition to those beneath the present Mid-Atlantic Ridge. "Plumes" related to deep mantle sources may have contributed to the LIL-element enrichment in the Triassic diabase and may also have been instrumental in initiating the rifting of the North Atlantic. Systematically high values for K and Sr87/Sr86 in the Triassic diabases may reflect superimposed effects of crustal contamination in the Triassic magmas.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 30.520657 * Median Longitude: -71.156043 * South-bound Latitude: 24.687800 * West-bound Longitude: -73.799700 * North-bound Latitude: 34.895300 * East-bound Longitude: -69.173300
Date/Time Start: 1970-04-20T00:00:00 * Date/Time End: 1970-05-13T00:00:00
Event(s):
11-100 * Latitude: 24.687800 * Longitude: -73.799700 * Date/Time: 1970-04-20T00:00:00 * Elevation: -5325.0 m * Penetration: 331 m * Recovery: 29.4 m * Location: North Atlantic/BASIN * Campaign: Leg11 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 93 m cored; 0 m drilled; 31.6 % recovery
11-105 * Latitude: 34.895300 * Longitude: -69.173300 * Date/Time: 1970-05-13T00:00:00 * Elevation: -5251.0 m * Penetration: 633 m * Recovery: 195.9 m * Location: North Atlantic/HILL * Campaign: Leg11 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 363 m cored; 0 m drilled; 54 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 1) Chemical composition of augite and plagioclase from DSDP Hole 11-100. https://doi.org/10.1594/PANGAEA.667487
  2. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 3a) Major element composition and CIPW Norms of least altered basalts from DSDP Hole 11-100. https://doi.org/10.1594/PANGAEA.667489
  3. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 3b) Trace element composition of basalts from DSDP Hole 11-100. https://doi.org/10.1594/PANGAEA.667490
  4. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 1) Chemical composition of augite and plagioclase from DSDP Hole 11-105. https://doi.org/10.1594/PANGAEA.667486
  5. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 3c) Major element composition and CIPW Norms of basalt glass and least altered crystalline basalts from DSDP Hole 11-105. https://doi.org/10.1594/PANGAEA.667491
  6. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 2) Chemical composition of olivine and chrome spinel from DSDP Hole 11-105. https://doi.org/10.1594/PANGAEA.667488
  7. Bryan, WB; Frey, FA; Thompson, G (1977): (Table 3d) Trace element composition of basalt and glasses from DSDP Hole 11-105. https://doi.org/10.1594/PANGAEA.667492