期刊
GEOLOGY
卷 50, 期 5, 页码 598-602出版社
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G49724.1
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- Shell Global Solutions International B.V. ExxonMobil Production Deutschland GmbH
The study explores the importance of isotope ratios of redox-sensitive metals in organic-rich rocks for understanding past deoxygenation and nutrient cycling on Earth, and investigates the impact of thermal alteration on the isotopic data in host sediments.
The isotope ratios of redox-sensitive metals in organic-rich rocks are critical tools for quantifying the timing and severity of deoxygenation and nutrient cycling in Earth's past. The resilience of isotopic data to thermal alteration of the host sediments over millions of years of burial is, however, largely unknown. We present molybdenum, uranium, cadmium, and zinc stable-isotope data from two stratigraphic successions of the same Lower Jurassic Posidonienschiefer unit in the Lower Saxony Basin of northern Germany that were affected by different burial histories. We show that thermal maturity had no effect on the isotopic compositions of these elements but does appear to have increased their concentrations in the rock. The data corroborate the results of laboratory-based maturation studies and provide constraints on the Mo, U, Cd, and Zn isotopic compositions of ca. 182 Ma seawater in the Lower Saxony Basin.
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