Drill core sulfur speciation profiling

Knowledge graph centered on Drill core sulfur speciation profiling with 19 nodes and 48 connections. Top connected: Potentilla, Bacteria, biogeochemical cycling, drive-point piezometer groundwater sampling, Sulfur Biogeochemical Cycling and Redox Dynamics i.

Method synopsis

Collection of continuous vertical and horizontal drill cores from shale bedrock to characterize sulfur speciation changes with depth and weathering extent. Combines drilling techniques with subsequent XANES analysis.

Synthesized from method descriptions across 1 paper 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 — Sulfur Biogeochemical Cycling and Redox Dynamics in a Shale-Dominated Mountainous Watershed (2022), Journal of Geophysical Research: Biogeosciences. Implementations in other papers (listed below) may differ.

1. Collect vertical shale core from lower hillslope
   A continuous vertical core to a depth of approximately 10 m below ground surface was collected from the lower hillslope using a track-mounted drill rig and a 0.14-m diameter ODEX drilling bit. A shale weathering profile was observed from 1-3 m bgs with numerous fractures and iron oxide discoloration between 2-3 m bgs.
   Quantities: One 10-m deep core, subsample from 2.7 m depth for weathered sample, subsample from 9 m depth for pristine sampleDuration: Not specifiedConditions: Northeast-facing hillslope adjacent to river at elevation 2763 m
   Equipment: track-mounted drill rig, 0.14-m diameter ODEX drilling bit
2. Collect horizontal shale core from outcrop
   A horizontal core approximately 1-m long was collected from the outcrop (~1-m above ground surface) using a hand drill with a 24.5-mm diameter diamond drilling bit using water as drilling fluid. Samples were taken from exposed section showing weathering signs and at depths of 40 cm and 80 cm in the core.
   Quantities: One 1-m horizontal core, 3 subsamples (top/exposed, 40 cm, 80 cm depth)Duration: Not specifiedConditions: Outcrop on Gothic Road at elevation 2895 m
   Equipment: hand drill, 24.5-mm diameter diamond drilling bit

Typical Equipment

• track-mounted drill rig
• 0.14-m diameter ODEX drilling bit
• hand drill
• 24.5-mm diameter diamond drilling bit

Output Measurements

• sulfur speciation profiles
• weathering gradients
• pyrite oxidation state

Papers Using This Protocol (1)

Species Studied With This Protocol