Large-scale motion between Pacific and Atlantic hotspots

Article Abstract:

Paleolatitudes from Pacific guyots indicate small latitudinal shifts of Pacific hotspots during the Cretaceous period that differ from the predictions from the true polar wander (TPW) models. The relative motion between Atlantic and Pacific hotspot groups appears to be larger than previously thought, approximately 30 mm per year. Comparison of direct paleolaltitudes with those determined from plate reconstructions facilitate a first-order test of hotspot fixity and TPW. Paleomagnetic data from basal sediments, volcanic basement and flanking sedimentary apron provide statistically inseparable paleolatitudes covering a period of 128-108 Myr.

Research, Cretaceous period, Paleogeography, Polar wandering

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Phytoplankton bloom on iron rations

Article Abstract:

Increased availability of iron limits phytoplankton in high nitrate-low chlorophyll regions such as the equatorial Pacific Ocean. Dramatic biological and biogeochemical changes in surface waters of the Pacific Ocean were observed following an in situ iron-fertilization experiment conducted in 1993 and again in 1995. Specifically, it was found that increased availability of the trace nutrient limits cell division rates, abundance and production rate in phytoplankton.

Environmental aspects, Growth, Iron, Iron (Metal), Phytoplankton

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