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Sr Isotopes in Seawater：Stratigraphy, Paleo-Tectonics, Paleoclimate, Paleoceanography
商品資訊
系列名：Elements in Geochemical Tracers in Earth System Sc
ISBN13：9781108994293
出版社：Cambridge University Press
作者：B. Lynn (University of California Ingram Berkeley); Donald J. (University of California DePaolo Berkeley)
出版日：2022/04/30
裝訂／頁數：平裝／75頁
版次：無法解析
商品簡介
商品簡介
Studies of Sr isotopic composition of thousands of samples of marine sediments and fossils have yielded a curve of 87Sr/86Sr versus age for seawater Sr that extends back to 1 billion years. The ratio has fluctuated with large amplitude during this time period, and because the ratio is always uniform in the oceans globally at any one time, it is useful as a stratigraphic correlation and age-dating tool. The ratio also appears to reflect major tectonic and climatic events in Earth history and hence provides clues as to the causes, timing, and consequences of those events. The seawater 87Sr/86Sr ratio is generally high during periods marked by continent-continent collisions, and lower when continental topography is subdued, and seafloor generation rates are high. There is evidence that major shifts in the seawater ratio can be ascribed to specific orogenic events and correlate with large shifts in global climate.
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