TY - JOUR A1 - Shields, G. A. T1 - A normalised seawater strontium isotope curve: possible implications for Neoproterozoic-Cambrian weathering rates and the further oxygenation of the Earth JO - eEarth J1 - eE VL - 2 IS - 2 SP - 35 EP - 42 Y1 - 2007/07/18 PB - Copernicus Publications SN - 1815-381X UR - http://www.electronic-earth.net/2/35/2007/ L1 - http://www.electronic-earth.net/2/35/2007/ee-2-35-2007.pdf ER -