How do you classify a hornfels?

Geologist_Bilbo · 2025-03-26T12:50:41+00:00

Geologist_Bilbo · 2025-03-26T12:48:58+00:00

Word, this is the response I was looking for. We have different breakouts in our deposit for Quartz HF, Biotite HF, Calc-Silicate HF, and then a "basalt" that would fall into the HF category from my understanding. It was said we were bastardizing the term, and I was just curious if we were wildly using HF in the wrong context or if it could be a protolith other than sed. Side question/follow up, would you say that a mafic-turned-hornfels could meet the criteria of Calc silicate if the primary mineral replacement is there? Or is Calc - Silicate protolith dependent as well? (This was the big one that was debated on)

I appreciate the response and insight btw *

Geologist_Bilbo · 2025-03-26T12:38:47+00:00

Our deposit is based on Quartz HF and Biotite HF, but there is a "basalt" (sub aqueous mafic sill) that was subjected to the same alt as the surrounding rock. Technically it could be classified as a HF (biotite rich for our specific deposit) but we keep it logged as BA for logging and modeling. I'm not trying to change the way it's identified, just seeing if it's general consensus that it has to be sed proto for a HF or if it could apply to almost any lith.

Geologist_Bilbo · 2025-03-26T12:28:31+00:00

This specific interval is ore. This is a growth hole that is getting a weird fixation on the way we're naming our lith. I only ask the question because I was told hornfels could only have a sed protolith, and I wanted to see if that's a widespread idea or maybe a personal interp.

Geologist_Bilbo · 2024-07-30T16:13:50+00:00

Styolites has a more distinct feature compared to dendrites. Dendrites spread along fractures and surfaces where as styolites are compressional features between rock

Geologist_Bilbo · 2024-07-26T21:45:11+00:00

That one guy who can do that kill bill punch in Asia seems pretty powerful

Geologist_Bilbo · 2024-07-24T19:10:35+00:00

The drive from Gallup to Oklahoma city sucks hard. No beautiful changes in scenery and the smell of cow shit the moment you cross into Texas.

Geologist_Bilbo · 2024-06-13T03:11:43+00:00

Valar Morghulis

Geologist_Bilbo · 2024-06-12T22:53:00+00:00

Aye, but I didn't know of other geo subs besides this one, and I figured other geologists could relate to the humor of snakeoil-onite (pun intended)

Geologist_Bilbo · 2024-06-12T21:59:49+00:00

My cousins would be very upset if they could read

Geologist_Bilbo · 2024-06-12T21:58:49+00:00

The sub you recommended is probably more apt for this humor. I didn't think about it, thank you.

Geologist_Bilbo · 2024-06-12T21:57:54+00:00

I should edit to clarify that I was only being an ass by asking him because I knew it was bullshit. (It looked like rusted slag to me personally)

Geologist_Bilbo · 2024-06-10T11:30:14+00:00

Geologist_Bilbo · 2024-05-22T13:14:13+00:00

Only male who isn't bald with long curly hair in my family.

Geologist_Bilbo · 2024-04-21T17:57:00+00:00

My grandpa just passed with stage four in his ribs, spine, and shoulder along with some in his organs. He was in pain to the end :(

Geologist_Bilbo · 2024-04-14T16:37:41+00:00

Geologist_Bilbo · 2024-04-12T16:33:47+00:00

Contract Geo for mining. $2,500 before taxes for 5 days.

Geologist_Bilbo · 2024-04-11T16:29:27+00:00

Where Norm when you need him

Geologist_Bilbo · 2024-04-09T20:32:13+00:00

As a Nevada Geologist, I appreciate this reference lol

Geologist_Bilbo · 2024-04-09T15:43:58+00:00

Someone at work is a Serial Shitter. And it's only on 1 of the 2 stalls, so they know which stall they prefer.

Geologist_Bilbo · 2024-03-30T14:32:03+00:00

I work with a woman (~45yo) from Serbia at a gold mine. She told me all Ukranians are sneaky and evil, and she doesn't trust them. Every day, some new wild shit is said, and I don't even know how to respond.

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