Strontium isotope analysis

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Method synopsis

Systematic sampling and isotopic analysis of carbon, oxygen, strontium, and sulfur from carbonate and sulfate minerals to determine paleoenvironmental conditions. Integration of multiple isotopic systems to distinguish marine from nonmarine depositional environments.

Synthesized from method descriptions across 7 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Middle Jurassic Todilto Formation of northern New Mexico and southwestern Colorado: Marine or nonmarine? (1995). Implementations in other papers (listed below) may differ.

1. Carbon and oxygen isotope sampling
   Collected limestone samples from Todilto Limestone Member for carbon and oxygen isotopic analysis, targeting calcite-rich portions of laminated limestone
   Quantities: Multiple samples from various localities (exact number not specified in visible pages)Duration: Not specifiedConditions: Various field localities across study area
   Equipment: sampling tools for carbonate rocks
2. Strontium isotope sampling
   Collected samples from both Todilto Limestone and Ralston Creek Formation limestone and gypsum for strontium isotopic analysis
   Quantities: 21 samples from limestone, additional gypsum samplesDuration: Not specifiedConditions: Field sampling at multiple localities
   Equipment: sampling tools
3. Sulfur isotope sampling
   Collected gypsum samples from Todilto Gypsum Member and Ralston Creek Formation for sulfur isotopic analysis
   Quantities: Multiple gypsum samples (exact number not specified in visible pages)Duration: Not specifiedConditions: Field localities with gypsum exposures

Typical Equipment

• sampling tools for carbonate rocks
• sampling tools
• sampling tools for gypsum

Output Measurements

• δ13C values
• δ18O values
• 87Sr/86Sr ratios
• δ34S values

Papers Using This Protocol (7)

Species Studied With This Protocol

Places Where Used