Geologist & VoltFixer
Geologist Geologist
VoltFixer VoltFixer
VoltFixer VoltFixer
I’ve been measuring the electrical resistivity of rock samples from different strata, and I think it could reveal hidden fault lines and geothermal hotspots. What do you think—could your field data help calibrate my readings?
Geologist Geologist
Sounds like a solid plan! I’ve got some GPS‑logged core samples from a few hundred meters of strata—basically the same depth range you’re looking at. If you can tell me the coordinates and the depth of each rock core, I can cross‑check the resistivity against the lithology and age. That should help you spot any anomalies that might line up with fault zones or heat vents. Just shoot me the data, and we’ll see if the field lines up with the numbers.
VoltFixer VoltFixer
Sure thing. Here’s what I’ve logged so far: 1. Core A – 34.2158°N, 118.4523°W, depth 250 m 2. Core B – 34.2194°N, 118.4551°W, depth 275 m 3. Core C – 34.2220°N, 118.4578°W, depth 300 m 4. Core D – 34.2256°N, 118.4605°W, depth 325 m 5. Core E – 34.2292°N, 118.4633°W, depth 350 m Let me know if you need the lithology notes or any other details for these.
Geologist Geologist
Nice list, thanks. I’ll need the lithology for each core – rock type, grain size, porosity, any known alteration – and the resistivity values you recorded. That’ll let me compare the field data to the stratigraphic framework and spot any hidden discontinuities or heat anomalies. Just drop the notes when you’re ready.
VoltFixer VoltFixer
Here are the details for each core, measured with the same precision as the resistivity: Core A – 34.2158 N, 118.4523 W, 250 m - Rock type: fine‑grained quartz‑sandstone - Grain size: 0.2–0.5 mm, well sorted - Porosity: 12 % - Alteration: minor clay illitization on surface grains - Resistivity: 18 Ω·m Core B – 34.2194 N, 118.4551 W, 275 m - Rock type: medium‑grained conglomerate with quartz pebbles - Grain size: 2–5 mm, poorly sorted - Porosity: 5 % - Alteration: Fe‑oxide staining on matrix - Resistivity: 45 Ω·m Core C – 34.2220 N, 118.4578 W, 300 m - Rock type: fine‑grained calcite‑rich limestone - Grain size: <0.1 mm, micritic - Porosity: 8 % - Alteration: pervasive dolomitization at 2 % depth - Resistivity: 7 Ω·m Core D – 34.2256 N, 118.4605 W, 325 m - Rock type: coarse‑grained sandstone, 1–3 mm pebbles - Grain size: 1–3 mm, moderately sorted - Porosity: 9 % - Alteration: minimal weathering, slight cements of quartz - Resistivity: 28 Ω·m Core E – 34.2292 N, 118.4633 W, 350 m - Rock type: fine‑grained argillaceous shale - Grain size: <0.1 mm, poorly sorted - Porosity: 4 % - Alteration: significant iron‑oxide staining, slight organic content - Resistivity: 62 Ω·m Let me know if you want more detail on any of the cores.
Geologist Geologist
That’s a good spread. The low resistivity in the limestone (Core C) fits the dolomitization – the Ca‑rich micrite is pretty conductive. The high values in the shale (Core E) and the iron‑oxide‑stained conglomerate (Core B) line up with the clays and Fe oxides. If you plot resistivity vs depth along the trend, any sudden spikes could flag a fault or a thermal anomaly. Maybe check for a lateral shift in the limestone‑to‑shale contact near 320 m; that could hint at a buried fault. Let me know if you need help interpreting the resistivity curves.
VoltFixer VoltFixer
I’ll plot the resistivity curve and flag any discontinuities. I’ll also check the lithology‑resistivity cross‑plot for that 320 m level. If there’s a lateral shift in the limestone‑to‑shale transition, I’ll mark it and annotate the potential fault trace. I’ll send you the graph once it’s ready for review.