Sr Isotopes in Seawater: Stratigraphy, Paleo-Tectonics, Paleoclimate, and Paleoceanography

The 87Sr/86Sr ratio of seawater has been used as a stratigraphic correlation and age-dating tool, revealing major tectonic and climatic events in Earth's history. It is high during continent-continent collisions and low during subdued continental topography, correlating with global climate shifts.

Format: Paperback / softback
Length: 75 pages
Publication date: 31 March 2022
Publisher: Cambridge University Press

Numerous investigations into the Sr isotopic composition of thousands of marine sediments and fossils have resulted in a curve depicting the relationship between 87Sr/86Sr and age for seawater Sr, spanning back to 1 billion years. Throughout this extensive period, the ratio exhibited significant fluctuations, displaying a substantial amplitude. However, it remains remarkably consistent across the oceans globally at any given time, making it an invaluable tool for stratigraphic correlation and age dating. Moreover, the ratio appears to capture significant tectonic and climatic events in Earth's history, offering insights into the origins, timing, and ramifications of these events.

During periods characterized by continent-continent collisions, the seawater 87Sr/86Sr ratio tends to be elevated, whereas it decreases when continental topography is subdued and seafloor generation rates are high. Evidence suggests that significant changes in the seawater ratio can be attributed to specific orogenic events and are closely linked to substantial shifts in global climate.

These findings highlight the profound impact of geological processes on the composition of seawater and shed light on the intricate interplay between tectonics, climate, and Earth's history. The study of Sr isotopes continues to provide valuable insights into the complex dynamics of our planet and its evolution.

Weight: 66g
Dimension: 151 x 228 x 7 (mm)
ISBN-13: 9781108994293
Edition number: New ed