Paleoceanographic applications of trace-metal concentration data

摘要: Abstract Recent studies have identified a range of new applications trace-metal concentration data in the analysis paleoceanographic systems. In restricted anoxic marine systems, trace-metal/TOC ratios can provide insight into degree watermass restriction and estimates deepwater renewal times. such secular changes sediment may evidence chemical evolution basinal deepwaters response to differential rates removal sediment. The silled basins is generally controlled by eustatic elevations, with higher (lower) sea levels resulting lesser (greater) restriction. Short-term (ca. million-year) drawdown inventory seawater has occurred repeatedly conjunction oceanic events, which result elevated widespread facies. Long-term (eon-scale) composition atmospheric–oceanic redox conditions their effects on cycling. Caution must be exercised evaluating patterns paleomarine however: (1) hydrographic analyses based relationships undertaken only systems that had deepwaters, (2) influence variation accumulation outweighs factors some