Sinton, John M; Byerly, Gary R (1980): Geochemistry of abyssal oceanic magmas [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.715067, Supplement to: Sinton, JM; Byerly, GR (1980): Silicic differentiates of abyssal oceanic magmas: Evidence for late-magmatic vapor transport of potassium. Earth and Planetary Science Letters, 47(3), 423-430, https://doi.org/10.1016/0012-821X(80)90030-8
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Massive, nearly holocrystalline dolerites from DSDP Hole 417D contain from 0.5 to 1.5% of granophyric patches composed mainly of Na-plagioclase and quartz. These patches are compositionally similar to other crystalline silicic rocks from oceanic spreading centers and differ from rarer abyssal silicic glasses. Crystalline varieties with SiO2 > 60 wt.% generally have Na/K >10, whereas silicic glasses have Na/K in the range 3-6. While crystal fractionation readily accounts for the Na2O and K2O contents of abyssal silicic glasses, both the 417D granophyres and other crystalline abyssal silicic rocks have much lower K2O than that predicted by any reasonable crystal-liquid fractionation model. We propose that high-temperature vapor phase transport is responsible for removal of potassium during late-stage crystallization of these rocks. This allows for the formation of cogenetic silicic glassy and crystalline rocks with greatly different Na/K ratios. These observations and interpretations lead to a more confident assignment of high Na/K silicic rocks of oceanic and ophiolitic environments to a cogenetic origin with basaltic oceanic crust.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 25.111500 * Longitude: -68.046800
Date/Time Start: 1976-12-02T00:00:00 * Date/Time End: 1976-12-30T00:00:00
Event(s):
51-417D * Latitude: 25.111500 * Longitude: -68.046800 * Date/Time: 1976-12-02T00:00:00 * Elevation: -5482.0 m * Penetration: 532.5 m * Recovery: 202.6 m * Location: North Atlantic/CONT RISE * Campaign: Leg51 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 508.6 m cored; 30.4 m drilled; 39.8 % recovery
52-417D * Latitude: 25.111500 * Longitude: -68.046800 * Date/Time: 1976-12-30T00:00:00 * Elevation: -5482.0 m * Penetration: 708 m * Recovery: 532 m * Campaign: Leg52 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Sinton, JM; Byerly, GR (1980): (Table 1) Geochemistry of granophyres from DSDP Hole 51/52-417D. https://doi.org/10.1594/PANGAEA.715065
- Sinton, JM; Byerly, GR (1980): (Table 2) Geochemistry of clay-rich patches from DSDP Hole 52-417D. https://doi.org/10.1594/PANGAEA.715066