Knowledge graph centered on Drill core sulfur speciation profiling with 25 nodes and 97 connections. Top connected: Gothic, Salix lucida subsp. lasiandra, Potentilla gracilis, Potentilla pulcherrima, Potentilla.
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
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
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