10.1594/PANGAEA.708671
Richardson, Stephen H
Stephen H
Richardson
Hart, Stanley R
Stanley R
Hart
Staudigel, Hubert
Hubert
Staudigel
Vein mineral ages of oceanic crust from the Atlantic Ocean
PANGAEA
1980
Drilling/drill rig
Leg51
Leg52
Glomar Challenger
Deep Sea Drilling Project (DSDP)
1976-12-02T00:00:00/1977-02-10T00:00:00
en
Supplementary Publication Series of Datasets
10.1029/JB085iB12p07195
2 datasets
application/zip
Creative Commons Attribution 3.0 Unported
Vein smectites with large Rb/Sr enrichments from extensively altered basaltic oceanic crust in Deep Sea Drilling Project hole 417A in the western Atlantic define a highly constrained Rb/Sr isochron age of 108 +/- 3 m.y. This age is identical to a less well constrained age of 108 +/- 17 m.y. for vein smectites with lower Rb/Sr enrichments from adjacent hole 418A and to the 108 m.y. age of crust formation derived by paleontological and magnetic anomaly correlation. Reasonable agreement exists between the 87Sr/86Sr ratio of vein calcites from both sites and the seawater 87Sr/86Sr ratio at the time. Pervasive low-temperature alteration in the contrasting environments of sites 417 and 418 appears to be coeval and essentially coincident with basement formation. Alteration may be used to advantage in determining ages of old oceanic crust.
Further relevant data see Hart and Staudigel (1978) data set: doi:10.1594/PANGAEA.708668
Supplement to: Richardson, Stephen H; Hart, Stanley R; Staudigel, Hubert (1980): Vein mineral ages of old oceanic crust. Journal of Geophysical Research: Solid Earth, 85(B12), 7195-7200
-68.0573
-68.0413
25.035
25.1105
North Atlantic/CONT RISE