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Geological Society, London, Special Publications; 1992; v. 64; p. 107-119;
DOI: 10.1144/GSL.SP.1992.064.01.07
© 1992 Geological Society of London

Modern Upwelling Systems and Palaeo-Upwelling Criteria

Oxygen and carbon isotopes in planktonic foraminifera as indicators of upwelling intensity and upwelling-induced high productivity in sediments from the northwestern Arabian Sea

Tineke N. F. Steens1, Gerald Ganssen1 & Dick Kroon2

1 Geomarine Center, Institute of Earth Sciences, Free University, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
2 University of Edinburgh, Grant Institute of Geology, West Mains Road, Edinburgh EH9 3JW, UK

Oxygen and carbon isotopes in the tests of Globigerina bulloides and Neogloboquadrina dutertrei from the Indian Ocean provide indicators for the intensity of upwelling and upwelling-related high productivity. The difference in {delta}18O between the surface dwelling G. bulloides and the thermocline dwelling N. dutertrei reflects the mixing of the water column during upwelling situations, and hence the intensity of upwelling. The difference in {delta}13C isotope distribution between the two species is smallest within upwelling areas, indicating that upwelling induced the high productivity. The two parameters are applied to Hole 728A (ODP 117), in the Arabian Sea on the continental margin of Oman. Both upwelling indicators show that from isotopic stage 2 till stage 11 upwelling was stronger during interglacial periods, and that upwelling intensified down core for the same period. In older sediments, stages 12 and 13, the signal from the upwelling indicators is reversed, showing stronger upwelling during glacials.





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F. J. C. Peeters and G.-J. A. Brummer
The seasonal and vertical distribution of living planktic foraminifera in the NW Arabian Sea
Geological Society, London, Special Publications, 2002; 195: 463 - 497.
[Abstract] [PDF]