FN Archimer Export Format
PT J
TI Geophysical and geochemical constraints on crustal accretion at the very-slow spreading Mohns Ridge
BT 
AF KLINGELHOFER, F
   GELI, Louis
   WHITE, RS
AS 1:;2:;3:;
FF 1:;2:PDG-DRO-GM-GEOPHYSIQUE;3:;
C1 IFREMER, DROGM, F-29280 Plouzane, France.
   Bullard Labs, Cambridge CB3 0EZ, England.
C2 IFREMER, FRANCE
   BULLARD LABS, ENGLAND
SI BREST
SE PDG-DRO-GM-GEOPHYSIQUE
IN WOS Ifremer jusqu'en 2018
   copubli-europe
IF 2.719
TC 32
UR https://archimer.ifremer.fr/doc/00000/10536/9397.pdf
LA English
DT Article
AB The composition of upper mantle and lower crustal material at very-slow spreading centers cannot be reliably determined by seismic studies alone. Since the range of P-wave velocities for serpentinized peridotites and gabbros overlap, additional information provided by the major and rare earth element (REE) content of the basalts is useful to constrain interpretations of seismic data. Refraction seismic data from the very slow spreading (16 mm/a, full rate) Mohns Ridge in the Norwegian-Greenland Sea yields a highly variable thin crust of 4.0 +/- 0.5 km thickness. Analysis of S-waves suggests that Layer 3 is composed primarily of gabbro containing at most a small percentage (< 20%) of mantle material. The Nas content of Mohns Ridge basalts suggests a magmatic crustal thickness of 4-5 km. Inversion of the REE concentrations yields a melt thickness of similar to 5 km. This agreement between seismic and geochemical data suggests that neither large quantities of mantle material are found in the lower crust nor is a large volume of basaltic magma frozen in the upper mantle.
PY 2000
PD MAY
SO Geophysical Research Letters
SN 0094-8276
PU Amer Geophysical Union
VL 27
IS 10
UT 000087062000031
BP 1547
EP 1550
ID 10536
ER

EF