TY - CHAP
T1 - XRF analyses of volcanic rocks from Leg 152 by laboratories in Edinburgh and Copenhagen
T2 - implications for the mobility of yttrium and other elements during alteration
AU - Larsen, Lotte Melchior
AU - Fitton, J. Godfrey
AU - Bailey, John C.
AU - Kystol, Jørgen
PY - 1998
Y1 - 1998
N2 - Neighboring (parallel) samples from 72 lava flows, splits of identical samples from five lava flows, and splits of 10 shipboard powders from Ocean Drilling Program Leg 152 were analyzed by X-ray fluorescence (XRF) in both Edinburgh and Copenhagen. The agreement between the two data sets is very good, although systematic differences are apparent in some cases. Correlation between the results for the identical powders is very high. Correlation between the results for the parallel samples is somewhat lower, mainly becaus eof element redistribution during secondary alteration, but also due to primary lava inhomogeneity. The elements show differences in the degree of scatter due to alteration, with K Rb, and Ba being the most mobile, and Si, Sc, Al, Fe, Zn, V, and Nb the least mobile. Y is immobile in the Site 917 lavas but distinctly mobile in the Site 918 lavas where it is both leached and precipitated locally. The mobility of Y is related to secondary breakdown of clinopyroxene at Site 918, in contrast to Site 917 where the clinopyroxene is generally fresh. The hydrothermal alteration conditions at the two sites appear to have been different.
AB - Neighboring (parallel) samples from 72 lava flows, splits of identical samples from five lava flows, and splits of 10 shipboard powders from Ocean Drilling Program Leg 152 were analyzed by X-ray fluorescence (XRF) in both Edinburgh and Copenhagen. The agreement between the two data sets is very good, although systematic differences are apparent in some cases. Correlation between the results for the identical powders is very high. Correlation between the results for the parallel samples is somewhat lower, mainly becaus eof element redistribution during secondary alteration, but also due to primary lava inhomogeneity. The elements show differences in the degree of scatter due to alteration, with K Rb, and Ba being the most mobile, and Si, Sc, Al, Fe, Zn, V, and Nb the least mobile. Y is immobile in the Site 917 lavas but distinctly mobile in the Site 918 lavas where it is both leached and precipitated locally. The mobility of Y is related to secondary breakdown of clinopyroxene at Site 918, in contrast to Site 917 where the clinopyroxene is generally fresh. The hydrothermal alteration conditions at the two sites appear to have been different.
UR - http://www.scopus.com/inward/record.url?scp=0032428882&partnerID=8YFLogxK
U2 - 10.2973/odp.proc.sr.152.246.1998
DO - 10.2973/odp.proc.sr.152.246.1998
M3 - Chapter in book
AN - SCOPUS:0032428882
VL - 152
T3 - Proceedings of the Ocean Drilling Program: Scientific Results
SP - 425
EP - 429
BT - East Greenland Margin
A2 - Saunders, A.D.
A2 - Larsen, H.C.
A2 - Wise, SW., Jr.
PB - Texas A & M University
ER -