Retrieving "Isotopic Ratio" from the archives
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Craton
Linked via "isotopic ratios"
Isotopic Constraints and Stability
Cratons are geochemically distinct because their mantle sources have experienced minimal subsequent enrichment or mixing. They preserve isotopic signatures reflective of Earth’s earliest differentiation events. For example, $\text{Nd}$ and $\text{Sr}$ isotopic ratios within cratonic rocks cluster near the terrestrial initial $\text{Nd}/\text{Sm}$ fractionation line, indicating that these reservoirs have not participated in [conve… -
Island Arc
Linked via "isotopic ratios"
Isotopic Signatures and Mantle Source
The isotopic composition of island arc lavas offers critical insights into the source materials involved in magma generation. Compared to MORB, arc lavas typically display elevated $\text{Sr}$ and $\text{Nd}$ isotopic ratios, indicative of ancient, crustal components assimilated into the mantle wedge or introduced via the subducting [sediment layer… -
Limestone Bedrock
Linked via "isotopic ratios"
Chemical Reactivity and Paleoclimatology
The fundamental susceptibility of limestone to acid dissolution makes it an excellent proxy for reconstructing past atmospheric carbon dioxide levels and precipitation acidity. Detailed analysis of isotopic ratios ($\delta^{18}\text{O}$ and $\delta^{13}\text{C}$) preserved within burial cements provides robust paleoclimatic data (Isotopic Signatures in Earth S… -
Siberian Plate
Linked via "isotopic ratio"
The Siberian Plate is world-renowned for hosting enormous deposits of nickel, platinum-group elements (PGEs), and vast reserves of fossil fuels, often associated with the Permian-Triassic boundary traps (e.g., the Tunguska Basin). The formation of the Noril’sk-Talnakh mineralization is directly linked to massive [flood basalt](/entries/fl…