Which of the following methods is NOT used to analyze ocean floor sediments?

Pulse-chase experiments are primarily used in biological and ecological studies to understand metabolic processes by tracking the movement of isotopes or compounds through organisms over time. This method focuses more on understanding biological systems rather than directly analyzing geological or sedimentological materials.

In contrast, isotopic analysis is an established technique used to examine the chemical composition of sediments, providing insights into past ocean conditions and climates. Biostratigraphy utilizes the fossil content of sediments to interpret the age and environment of deposition, and core sampling involves extracting cylindrical sections of sediment from the ocean floor to analyze the various layers for historical data. Each of these methods is deeply rooted in sediment analysis and plays a critical role in studying ocean floor sediments, making pulse-chase experiments the outlier among the listed options.