10.1594/PANGAEA.722622
Mahoney, John J
John J
Mahoney
Duncan, Robert A
Robert A
Duncan
Tejada, Maria Luisa G
Maria Luisa G
Tejada
0000-0002-7580-5343
Sager, William W
William W
Sager
Bralower, Timothy J
Timothy J
Bralower
0000-0002-3503-859X
Chemical, isotopic and isotope-chronological data for samples from DSDP Hole 62-464 and ODP Holes 191-1179D and 198-1213B
PANGAEA
2005
Drilling/drill rig
Leg62
Leg191
Leg198
Glomar Challenger
Joides Resolution
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
1978-08-17T00:00:00/2001-10-09T19:00:00
en
Supplementary Publication Series of Datasets
10.1130/G21378.1
ftp://rock.geosociety.org/pub/reposit/2005/2005034.pdf
6 datasets
application/zip
Creative Commons Attribution 3.0 Unported
Basalt sills cored in lowermost Berriasian sediments on Shatsky Rise in the northwest Pacific yield a mean 40Ar-39Ar incremental heating age of 144.6+/-0.8 Ma, providing a minimum estimate on the age of the Jurassic-Cretaceous boundary. The largest part of the rise was emplaced at rates similar to those of several continental flood basalts. The rise formed at an oceanic triple junction, and the sills, as well as lavas from two dredge sites, exhibit an ocean ridge-type Nd-Pb-Sr isotope signature. This signature is provisionally consistent with either a perisphere or meteorite-impact model, but is not predicted by the plume-head model of plateau formation. However, no model can yet be rejected, given the very sparse sampling of Shatsky Rise.
Supplement to: Mahoney, John J; Duncan, Robert A; Tejada, Maria Luisa G; Sager, William W; Bralower, Timothy J (2005): Jurassic-Cretaceous boundary age and mid-ocean-ridge-type mantle source for Shatsky Rise. Geology, 33(3), 185-188
157.2977
173.8888
31.57763
41.0802
North Pacific/CONT RISE
North Pacific Ocean