Lithium and strontium isotopic compositions of sediments and pore waters at ODP Sites 152-918 and 152-919 ...
The distribution of Li isotopes in pore waters to a depth of 1157 m below seafloor is presented for ODP Sites 918 and 919 in the Irminger Basin, offshore Greenland. Lithium isotope data are accompanied by strontium isotope ratios to decipher diagenetic reactions in the sediments which are characteri...
| Main Authors: | , , |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
1998
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.708162 https://doi.pangaea.de/10.1594/PANGAEA.708162 |
| Summary: | The distribution of Li isotopes in pore waters to a depth of 1157 m below seafloor is presented for ODP Sites 918 and 919 in the Irminger Basin, offshore Greenland. Lithium isotope data are accompanied by strontium isotope ratios to decipher diagenetic reactions in the sediments which are characterized by the pervasive presence of volcanic material, as well as by very high accumulation rates in the upper section. The lowering of the 87Sr/86Sr ratio below contemporaneous seawater values indicates several zones of volcanic material alteration. The Li isotope profiles are complex suggesting a variety of exchange reactions with the solid phases. These include cation exchange with NH4+ and mobilization from sediments at depth, in addition to the alteration of volcanic matter. Lithium isotopes are, therefore, a sensitive indicator of sediment-water interaction.d6Li values of pore waters at these two sites vary between -42 and -25‰. At shallow depths (<100 mbsf), rapid decreases in the Li concentration, ... : Supplement to: Zhang, Libo; Chan, Lui-Heung; Gieskes, Joris M (1998): Lithium isotope geochemistry of pore waters from Ocean Drilling Program sites 918 and 919, Irminger Basin. Geochimica et Cosmochimica Acta, 62(14), 2437-2450 ... |
|---|