TY - JOUR

T1 - 87Sr/86Sr record of Permian seawater

AU - Korte, Christoph

AU - Jasper, Torsten

AU - Kozur, Heinz W.

AU - Veizer, Ján

N1 - Funding Information: The Deutsche Forschungsgemeinschaft (Leibniz-Preis, Ve 112/8-1; grant Ve 112/12-1; Ve 112/14-3 and Le 469/10-1) supported this project financially. We acknowledge the analytical work of D. Buhl, the technical assistance of B. Raczek, the field guidance and sample donations of G. Bell, T. Grunt, A. Hart, Z.-T. Liao, L.-J. Liu, W. Munk, H.-A. Nakrem, P. Raczynski, T. Rehren, U. Scheer, S.-H. Shen, J. Wendt and the statistical calculation of T. Wember. We thank R.E. Denison and J. McArthur for reviews of the manuscript and helpful annotations.

PY - 2006/10/6

Y1 - 2006/10/6

N2 - A population of 169 Permian articulate brachiopod shells was analysed for their 87Sr/86Sr ratios. 51 of these, characterised as well preserved and stratigraphically well defined, are utilized for delineation of the Permian seawater strontium isotope trend. The 87Sr/86Sr curve shows values of about 0.7080 in the lowermost Permian (Asselian), followed by a gradual decline to 0.70685 in the Capitanian and a minor rise in the Dzhulfian and lower Dorashamian to values of 0.70715 just below the Permian-Triassic boundary. The Early Permian decrease in the strontium isotope curve that commences in the early Sakmarian is coincident with the advancing deglaciation of the Gondwana and with the increased aridity in large parts of the Pangaea. These factors may have led to a reduced continental weathering of Rb-rich silicate rocks, and thus to the decline in seawater 87Sr/86Sr. Starting with the Artinskian, the opening of the Neotethys and the associated widespread basaltic volcanism supplied low radiogenic strontium to seawater from an enhanced hydrothermal flux. In the Capitanian, basaltic volcanism in the entire Palaeotethys ceased and this may have been the reason for a slightly more radiogenic seawater isotopic composition during the Lopingian. Higher input of riverine Sr due to expansion of humid areas may have been a contributory factor.

AB - A population of 169 Permian articulate brachiopod shells was analysed for their 87Sr/86Sr ratios. 51 of these, characterised as well preserved and stratigraphically well defined, are utilized for delineation of the Permian seawater strontium isotope trend. The 87Sr/86Sr curve shows values of about 0.7080 in the lowermost Permian (Asselian), followed by a gradual decline to 0.70685 in the Capitanian and a minor rise in the Dzhulfian and lower Dorashamian to values of 0.70715 just below the Permian-Triassic boundary. The Early Permian decrease in the strontium isotope curve that commences in the early Sakmarian is coincident with the advancing deglaciation of the Gondwana and with the increased aridity in large parts of the Pangaea. These factors may have led to a reduced continental weathering of Rb-rich silicate rocks, and thus to the decline in seawater 87Sr/86Sr. Starting with the Artinskian, the opening of the Neotethys and the associated widespread basaltic volcanism supplied low radiogenic strontium to seawater from an enhanced hydrothermal flux. In the Capitanian, basaltic volcanism in the entire Palaeotethys ceased and this may have been the reason for a slightly more radiogenic seawater isotopic composition during the Lopingian. Higher input of riverine Sr due to expansion of humid areas may have been a contributory factor.

KW - Brachiopods

KW - Neotethys

KW - Palaeotethys

KW - Permian

KW - Strontium isotopes

UR - http://www.scopus.com/inward/record.url?scp=33748740755&partnerID=8YFLogxK

U2 - 10.1016/j.palaeo.2006.03.047

DO - 10.1016/j.palaeo.2006.03.047

M3 - Journal article

AN - SCOPUS:33748740755

VL - 240

SP - 89

EP - 107

JO - Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences

JF - Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences

SN - 0031-0182

IS - 1-2

ER -