Perfect Alteration Indicator Porphyry
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- Опубліковано 26 сер 2023
- Porphyritic rocks can be great indicators of the intensity of alteration in a hydrothermal system and several other useful things if they have the right set of minerals. I found one with all the right stuff.
The numbering system that I use in this video is for intensity of hydrothermal alteration. In short it is:
0: No visible changes.
1. Partial replacement of one mineral.
2. Complete selective replacement of one mineral.
3. Partial replacement of all minerals.
4. complete replacement with texture preserved.
5. Original texture destroyed by alteration.
I'm slowly collecting video examples for each of the levels to make a comprehensive video guide for the system and this example added some good material for the future video. - Навчання та стиль
I wish I saw this 20 yrs ago! More like this please!
I have a plan to make a full video on the levels system when I get enough material together. The place I am working now has filled a lot of gaps in that collection.
Thanks for this awesome video! For Geology students that have never seen these alterations in the field, this videos is quite eye opening!👌🏽👏🏽👏🏽👏🏽
It does help to have seen the processes in thin section first, but the huge phenocrysts in this rhyolite made it possible to see (and video) some of them clearly in the field.
Very informative, answered some lingering questions that have been on my mind lately.
Great. If I answered questions, my work is done!
Hadn't seen you in while. Good to see you back.
Yep. I'm back in the bush :)
Excellent overview of this methodology. Super critical information for project development and growth
Agreed. I am amazed it isn't taught more widely
I really love and enjoy seeing your video. It's delightful to hear an experienced geologist talking about this marvellous rock types. Here in Colombia we have some specially interesting Andesite Porphyries in Western and Central Cordilleras... Cheers!
Great. I was actually working with a columbian geologist on this job!
I just love you!! You make more sense than most!! Thank you so much!!
Thanks very much. Glad you found my videos helpful.
I'm studying geology at university in Bris. Your hands on style of teaching is extremely valuable
That's great. We need more geologists! I try to teach stuff that's difficult to do in a university classroom.
Nice rock and good video. I always enjoy your field trips..........An apples to oranges compsarison to Argillic assemblages would have been good...kaolinite replacing plagioclase and montmorillonite replacing amphibole and plagioclase. Argillic grades into phyllic alteration at higher temperatures in an ore deposit hydrothermal system.
That's a good idea for a video. Next time I am working on a system with argillic alteration, I will make one!
Now I found the perfect Geologist.
Thank you sir!
Iam Amir from Pakistan , currently working on porphyry deposits,
Your videos are very helpful for me thanks again ❤
Thanks very much. Alteration mapping is a very useful tool in porphyry systems.
Fantastic video Nick, thanks for sharing your knowledge. Looks like some of the areas up in FNQ.
Yep. Out in the Featherbed Volcanics.
Excellent class, Nick Tate! Hugs from Brazil
Thanks very much. I haven't worked in Brazil, but I would like to. Lots of interesting rocks, mineral deposits and people!
Thanks for another clear concise video!
Thanks. This place has some great examples and crystals big enough to see easily :)
Dear Nick, it was one of the best descriptions about hydrothermal ,porphyry base metal alterations. Unfortunately I couldn’t pay from Iran for more informations , but I always enjoyed your great videos as far as I could watch. Thanks n good luck 👍
Thanks very much. There are some great porphyry deposits in Iran and great exposure too so these techniques should work really well.
@@GeologyUpSkill Exactly mate👍🙏, I’m an exploration geologist so use your great technics all the time. Many years ago ,1999-2006 I used to work with Australian geologists also from other great countries like New Zealand,Canada also South Africa. so I’ve learned a lot from them especially my Australian colleagues,we have lots of workshops and training courses by Snowden and so on. I’m really proud of that. So I really enjoyed the way you talk about geology stuff and remember me my brilliant period of life.
Great job mate🙏🙏🙏👍👍👍
@@GeologyUpSkillHey Nick
This is my real name account, Hiro is my gaming one,so I have to apologize for leaving comments with that one.
Great to Know you mate
Best Regards
YOUR MY FAVORITE GEOLOGIST" WHAT A GREAT VIDEO!!! THANX4POSTING! CHEERS" from -7c Central Idaho BASALT HELL ITS everywhere!!!
Thanks. I find it is one of the most useful tools for mapping big hydrothermal systems.
Nice fact-based lecture. Thx.
Thanks. I find it a most useful tool in the field.
Thank you for this it's much appreciated.
Could you expound more on the alteration levels that you use?
Thanks Tracey. I've added a summary of my numbering system in the video description.
Ya hammer is looking good mate. Smashing 👍🏼
Yes. It's the first tour of duty for the new long handle version and it's giving the rocks hammering :)
Please review about, orogenic gold in ophiolite rock (lieswanite/listvenite)
I haven't worked on that style before, but if I do, I will certainly make a video!
have you done any videos on talc formation yet?
Not yet. I dont work much on industrial mineral projects.
So Nick, in theory, it could have been a lava with large crystals? Is it possible to distinguish such a lava from an intrusive?
In this case, the matrix has a microgranular texture so it is a short step away from a porphyritic microgranite, but in most cases geological mapping will give you the answer via contact relationships with surrounding rocks.
@@GeologyUpSkill no quick way, start walking :)
Thanks Nick
How to private contact to you Nick.?
Best to connect on Linkedin and message me there.
How to connect ???
LinkedIn is best. Look for Nick Tate.
Pls email??
SOMEONE THAT RECOMENDED TO ME A BOOK ABOUT ALTERATIONS LIKE FIEWLD GUIDE?¡
This book is a great start. Prof. Roger Taylor was my supervisor for Honors at James Cook University. link.springer.com/book/10.1007/978-3-642-01783-4
How to private contact to you Nick.?
Best to connect on Linkedin and message me there.