MANGANESE AS AN INDICATOR OF THE INTENSITY OF ANOXIA DURING
THE DEPOSITION OF THE SENONIAN OIL SHALES IN THE NEGEV,
ISRAEL
T. MINSTER
S. ILANI
O. YOFFE
Geological Survey of Israel
95501 Jerusalem, Israel
J. KRONFELD
Tel-Aviv University
69978 Tel-Aviv, Israel
| The geochemical relationship of Mn to organic carbon, iron and alumina was studied in Early Maastrichtian oil shales of southern Israel. The Mn concentration appears to mirror the intensity of anoxia in the bottom waters of the depositional basin. It is proposed that the general trend of increasing Mn stratigraphically upward through the organic-rich sequence is a reflection of fluctuating redox conditions during the transition from an anoxic to a more oxidizing regime. |