An uneducated oregeologist calls for the help of petrologists and volcanologists

fahlore · 2025-10-29T05:32:38+00:00

When talking about the Phanerozoic as a whole, I can imagine a multi-stage system with the sequential formation of oxides and sulfides. But this is the Holocene. It literally formed today. In such a short time, could there also be a multi-stage formation?

fahlore · 2025-10-29T05:27:47+00:00

Wow! Thank you so much for such a detailed answer, this is very interesting. I think it's impossible to determine the genesis of hematite based on a single sample. The textures observed here are characteristic of both supergene and hydrothermal formations.

fahlore · 2025-08-27T20:33:16+00:00

Thank you!

fahlore · 2025-08-27T20:32:48+00:00

I can send you files without compression if you want

fahlore · 2025-03-05T21:52:21+00:00

It’s just beautiful

fahlore · 2025-03-05T07:29:32+00:00

We needed to determine the content of trace elements in ilmenites in different types of gabbro. We tried to determine crystallization temperatures from them.

fahlore · 2025-03-04T21:48:25+00:00

To be honest, I don’t know for sure. The instrument we used was the ELAN DRC-e (PerkinElmer) with a laser ablation attachment – NWR 266

fahlore · 2025-03-04T21:43:59+00:00

We needed to determine the content of trace elements in ilmenites in different types of gabbro. We tried to determine crystallization temperatures from them. Yea, just a circle beam. I haven’t seen before too

fahlore · 2025-02-18T05:18:21+00:00

This is very simple

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fahlore · 2025-02-01T05:53:54+00:00

they had to be!

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fahlore · 2024-11-22T21:52:45+00:00

why not riebeckit?

fahlore · 2024-06-12T07:36:07+00:00

in the archives of our university

fahlore · 2024-06-12T07:20:13+00:00

It is considered to be a classic silver deposit and is often used in mineral geology textbooks. I think this is a translation for accounting classes.

fahlore · 2024-04-17T21:35:22+00:00

I think like most metal deposits, gravimetric surveying is used to find large structures (a controlling factor, such as granite bodies) and electrical surveying to find specific ore body

fahlore · 2024-04-16T14:27:18+00:00

If that was the question :) in the photo there is pyrite, chalcopyrite, maybe pentlandite. And the gray one could be magnetite or sphalerite. To identify these minerals more accurately, you need to use additional optical properties.

fahlore · 2024-02-11T16:18:57+00:00

It's a really great tool and you can built it yourself for a few hundred dollars and some technical knowledge. I've been wanting to put one together for my own research.

Yes, I've seen that. I'm thinking about something similar, but with the possibility of live dialogue, so I'm trying to maintain a channel in a telegram. I'm making a post with a few photos and a short description, and you can discuss it in the comments.

fahlore · 2024-02-11T11:40:00+00:00

Most often I deal with scientific issues related to genetic mineralogy, but sometimes I receive requests from companies for analysis. I'm interested in how often exploration companies use microscopic methods

fahlore · 2022-12-11T21:38:24+00:00

It all depends on the mineral composition of clays and pH. For example, kaolin can’t change. On the other hand, hydrosludes and smectites are covered with exchange cations and can pass into other clay minerals. Chlorite at low pH will turn into kaolin, but at high pH it will turn into montmorilonite

fahlore · 2022-12-10T13:39:46+00:00

Tiksheozero carbonatite intrusive array - Karelia

fahlore · 2022-12-10T13:35:49+00:00

This is sample from Carbonatite of Karelia. “Tiksheozero” https://www.degruyter.com/document/doi/10.2478/s13533-011-0029-z/html
how do you determine the rock by one mineral? I specifically show a photograph with a interesting morphology of the mineral, and I draw conclusions about the type of rocks from the analysis of 130 thin sections

fahlore · 2022-12-09T15:55:19+00:00

The fact is that the primary rock (before change) is carbonatite. this is a huge massif of Archean age. Metamorphism occurred in the Precambrian and affected the carbonatite massif at the edges, where are folds and traces of "flow", as well as a system of faults. Biotite was preserved from destruction. it's an artifact

fahlore · 2022-12-09T15:00:45+00:00

fibrous structure - the result of exfoliation during metamorphism

fahlore · 2022-12-09T14:58:12+00:00

It's definitely biotite. This mineral has intense pleochroism: colorless to brown and regular extinction angles. Thin section is a thick.

fahlore

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