Sodic Alteration

[@lundgrenbronzestudios]

This is the type of guy who makes field trips fun.

[@GeologyUpSkill]

Field trips are fun. You dont need me!

[@mexer3953]

Really useful information

[@GeologyUpSkill]

Thanks very much. The videos that provide useful field tools always seem to do best so I am trying to make more of that type!

[@KimPhilipDalanon]

Love your contents, stay safe in the field and teach us more applied geo-survey.

[@GeologyUpSkill]

Thanks. I'm working on it!

[@HassanAdamHassan_B13]

،thank you doctor

[@pkgoldopalhunting]

great info like learning this stuff especially gold bearing rocks and indications

[@GeologyUpSkill]

Thanks. Glad you found this one useful.

[@ro_odge]

I was starting to lose interest with geology (being a geology student) but your videos really reignited my love for this field. Thank you so much!

[@GeologyUpSkill]

Getting out into the field usually fixes that problem :)

[@scottwbriscoe]

As always such a great explanation.

[@GeologyUpSkill]

Thanks Scott. I have been looking for a good example for ages and this one fitted the bill.

[@paulw3182]

Great Video.. Should of become a field geologist! Was bitten by the bug after working for a global mining company focused on porphyry. Was amazed so many tons of rock were be ground up and leached to recover ore. Lost my position when gold price dropped, one geologist who formally worked for Phillips and others said, that's the nature of the business.

[@GeologyUpSkill]

Yes, it's certainly not a smooth ride, but if you can live with that, it's a lot of fun!

[@magictrades159]

Interesting the albite can be different colours from its usual white. Student geologists could get confused there ahaha. The presence of albite + pyrite appears to be a useful indicator. With it's changed colour to reds/browns, might that indicate Fe or Mn substitution? Wondering if albite mineral chemistry could be useful? - one for the academics to chase i suppose

[@GeologyUpSkill]

Mostly the reddish colours are due to very finely disseminated hematite which seems a little odd since pyrite usually gobbles up any iron in the rock, suggesting that the pyrite might be late in the paragenetic sequence. Actually you can see small grey halos around the pyrite grains in this rock suggesting that the pyrite has stripped iron from the surrounding albite.

[@rodrigopirainetravassos8899]

Very nice field tips!

[@GeologyUpSkill]

Thanks! Hope you find them useful.

[@mustafa_mohammadpoor20]

Doctor,Great as always

[@GeologyUpSkill]

Thanks Mustafa.

[@jdean1851]

GOOD INFO"THANKS!

[@GeologyUpSkill]

Thanks very much. Good info is what I try to capture in every video.

[@milenaresources4244]

So an albitic rock adjacent to or under Cu-Mo-Au porphyry mineralization (say 300 million tons of .35 Cueq) might show up as a changeability high but low conductivity? You get a strong IP anomaly at depth. I think of albite as being the reaction product of a discrete Cu depositing system. Our project guys say it’s the barren shoulder and to stop drilling. Hmmm?

[@GeologyUpSkill]

It is notorious for making great IP chageability anomalies around the edges of the real action. Maybe even better than phyllic altertation. Drilling those big red blobs without other supporting data has led to a lot of missed discoveries I think!

[@vernshein5430]

We saw a lot of albitic alteration at the oddball Moss Lake deposit in the Shebandowan area, 4:27 NW Ontario. It was creamy white and when intense, texturally destructive. Main mineralization phase was phyllic with a propylitic outer envelope.

[@keithwood6459]

Do quartz phenocrysts survive sodic alteration? Thank you for this information video. I’m a field geologist working in a porphyry skarn environment at the moment.

[@GeologyUpSkill]

Great. I hope you find some sodic alteration!

[@keithwood6459]

@@GeologyUpSkill I think we might have! Back to my question: Do quartz phenocrysts survive sodic alteration?

[@GeologyUpSkill]

@@keithwood6459 Usually they do, and that is very useful because they are often the only remnant clue about the original rocktype. However there are some exceptions. I have seen one unusual tin deposit (Zaaiplaats) where the quartz grains in a granite were selectively removed during albite alteration and made space to precipitate ore minerals (mostly cassiterite).

[@keithwood6459]

@@GeologyUpSkill Thank you so much for your time. That's very helpful. You're making us all better geologists!

[@keithwood6459]

@@GeologyUpSkill I can confirm sodic altered felsic intrusive on the property now, as well as phyllic altered similar intrusive. Thank you.

[@hassannaser-gp1ur]

🇸🇾🙏🏻

[@harry7272s]

Very useful, Thankyou Sir! I want to study in Australia Currently i am class 12 student I am confused between geography and geology In what university do you teach? and which region is best to do undergraduate geology or geography degree

[@GeologyUpSkill]

I don't teach at a university. I teach on KZbin :) The best university to select depends on which branch of geology or geography you like best. Answer that question first, then find the uni that specializes in that area.

[@harry7272s]

@@GeologyUpSkill thanks a lot! Can you please help me to figure out what is best geology, geography or environmental science degree Please make a Video on this topic It will be helpful as geologist, geographer, environmentalist jobs are kind of similar so am quite confused to choose what for better future. Again thankyou! 🐅

[@billyingram8347]

Damn, your great at your job, if I won lotto, I’d hire you to visit some of my favourite spots just to hear your thoughts bravo

[@GeologyUpSkill]

After 40 years in the field, you learn a thing or two. Now I'm trying to get some of those things down on video so the next generation of geologists won't have to learn them the hard way.

[@milenaresources4244]

Your hammer rings F## or even G. That’s about 30-40 points above F#. Pretty nasty sound. Phonolites at Cripple creek give hard E if I recall. Jack legs on latite ? At Colorado sunnyside mine vein host ring about E. My ears have a bit of a gap there). (I Checked your hammer sound with an electronic tuner). Core drilling of greisen/pyrophyllite hi alumina rock polishes the core and leaves scratches like an old vinyl record. I bet you could extract data from those scratches. Like SPT on geotechnical holes. Strangely…nobody seems interested in rate of penetration data. They should. The oil field guys set great stock in it.

[@GeologyUpSkill]

Actually that is another indicator of albite alteration. It rings like a porcelain plate when you hit it. The sound you hear in the video is a crazy combination of the actual hit slowed down to 10% of of actual speed and a metallic hammer hit that recreates something like the real world sound.

[@milenaresources4244]

@ I think pink rhodonite was the rock I hated most. Almost couldn’t break it with a normal hammer. I selected easy pieces too. It was a vein rock I had to sample at the mine. Pounding rhodonite was harder than phonolite…both at about 14,000 ft! Yeah…moiling for gold in the hot sun. But pounding rhodonite in a shrinkage stope…? You ought to have some fun stories about big screwup’s. Me…I found micro covellite in core that nobody would believe. I got it confirmed finally but the JV company missed it. Everything was Cpy. Ha! Nope. Blue micro covellite! Not one log mentioned it. $2-3 million spent. So I got a dinolite! Oh…that cleavage plane…looks kind of like a baveno twin on kspar. Plag? Eh. Sanidines? You gotta get a dinolite! They link to your phone now and you can get like 10- 200x! Wish I had some of my own core…albite! Never thought it was so colored!

[@milenaresources4244]

Carlsbad?

[@GeologyUpSkill]

The banded reflections on that big feldspar suggest lamellar twinning of a plagioclase, although there are some K-feldspar phenocrysts with Carlsbad twins elsewhere in the sample.

[@mustafa_mohammadpoor20]

Doctor Tate please check your email and guide me

[@GeologyUpSkill]

I have checked, but don't see any message. What address are you using?