Construction of the Silurian and Devonian seawater 87Sr/86Sr curve
β Scribed by R.E Denison; R.B Koepnick; W.H Burke; E.A Hetherington; A Fletcher
- Book ID
- 117073448
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 342 KB
- Volume
- 140
- Category
- Article
- ISSN
- 0009-2541
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**ABSTRACT** This work presents a detailed ^87^Sr/^86^Sr isotope curve for the interval 7.5β9.7βMa obtained by a highβresolution analysis (sampling spacing of about 40βkyr) of an astronomically calibrated landβbased sedimentary sequence exposed in the central Mediterranean area (Gibliscemi section,
A marble band in the β 2.75 Gyr old Ramagiri schist belt in the Dharwar craton of south India gave a PbβPb age of 3.075βΒ±β0.095 Gyr. The geochemical data, including high Sr and low Ba and Mn indicate seawater origin for the parent rock, and that there was insignificant geochemical exchange between t