New Zealand Journal of Marine and Freshwater Research abstracts

---

Marine sediments in a region of recent volcanic activity in the Bay of Plenty, New Zealand

MICHAIL V. PROPP
VYACHESLAV S. ODINTSOV
LUISA N. PROPP

Institute of Marine Biology
Far East Branch, Russian Academy of Sciences
Vladivostok, 690041, Russia

VLADIMIR M. SHULKIN

Institute of Geography
Far East Branch, Russian Academy of Sciences
Vladivostok, 690032, Russia

Abstract  The chemical composition of recent marine sediments and pore waters in areas of shallow underwater volcanic vents in the Bay of Plenty, New Zealand, was studied. Values of pH in the sediments in active sites were higher than in control sites, and concentrations of Fe, Cu, and Ni were elevated; however, the general chemical composition of the sediments and pore waters was rather similar to that of common shelf sediments. The chemical composition of pore waters agrees well with the usual diagenesis of these sediments; the increase in temperature might influence the rates of diagenetic processes. No signs of uniform seeping of volcanic waters through the sediments were detected. Hydrothermal waters and gases are preferentially transported through sulfur tubes. These tubes and sulfide concretions replacing magnetite were collected at and near the hydrothermal vents.

Keywords  volcanic vents; marine sediments; pore waters; nutrients; heavy metals; sulfides

PDF file of entire paper: medium quality (533K); (scanned from paper original: notes about this process)

---

This year's abstracts | Journal home page | All abstracts | Publishing home page