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GeoFacts Hub 🌍 Geo Facts | Geology
🪨 Strange Earth • Ancient stories
⏳ Science beneath your feet

26/09/2026

Geochemical criteria for accumulation of minerals as placers

🌍 What forces shape Earth’s crust?Earth’s crust is constantly being deformed, uplifted, fractured, weathered, and reshap...
26/09/2026

🌍 What forces shape Earth’s crust?

Earth’s crust is constantly being deformed, uplifted, fractured, weathered, and reshaped by powerful internal and external forces.

🔥 Endogenic forces: Tectonic movements, earthquakes, volcanism, magmatism & isostasy
🌊 Exogenic forces: Weathering, erosion, transportation, deposition & mass wasting

From mountain building and faulting to river erosion and sediment deposition, these forces continuously reshape our planet. 🌎

🔬 Geology is the story of Earth in motion.

26/09/2026

Ever wonder what disseminated ore actually looks like up close? 🪨 Instead of a solid vein, valuable minerals like chalcopyrite are scattered evenly through the host rock. Have you ever spotted disseminated sulfides in the field?

This image showcases a classic folded mineral vein (likely quartz or a quartz-feldspar mix) hosted within a dark, highly...
25/09/2026

This image showcases a classic folded mineral vein (likely quartz or a quartz-feldspar mix) hosted within a dark, highly deformed metamorphic rock matrix

25/09/2026

Zealandia, also known by its Māori name Te Riu-a-Māui, is Earth's eighth and youngest continent, sitting 94% submerged beneath the South Pacific Ocean.

🌋 Lamprophyre vs Kimberlite 💎Both are mantle-associated igneous rocks, but they have very different geological character...
25/09/2026

🌋 Lamprophyre vs Kimberlite 💎
Both are mantle-associated igneous rocks, but they have very different geological characteristics.
🔹 Lamprophyre — commonly porphyritic and mafic, commonly alkaline, and typically occurs as d***s and sills.
🔹 Kimberlite — ultramafic, volatile-rich and olivine-rich, commonly forming pipes, d***s and sills, with an important association with primary diamond deposits.
💎 Key takeaway: A mantle-derived rock is not automatically a diamond host. Kimberlite has a distinctive association with primary diamond deposits.
Which one would you identify in the field? 👇

25/09/2026

⛏️ NOT EVERY ORE BODY IS MASSIVE!

Some ore bodies are thin, sheet-like, yet extend over large distances. 👀

That’s a TABULAR ORE BODY — where:

📏 Lateral extent ≫ thickness
📐 Can have a measurable strike & dip
🪨 Occurs within surrounding host rock

🔥 Remember: “Tabular” describes the geometry, not necessarily the origin.

Could you identify one in a geological cross-section? 👇

24/09/2026

🔬 What’s your “Optical Nemesis” in Thin-Section Identification?

Let’s talk petrographic microscopy! 👀

Which mineral gives you the most trouble under cross-polarized light (XPL)?

For me, it’s distinguishing certain feldspars when twinning is poorly developed or unclear.

👉 What mineral challenges you the most?
Share your identification tips or tricks in the comments! 🧪🔬

⛏️ Concordant vs Discordant Ore BodiesThe key difference is geometry:🔹 Concordant ore bodies follow the bedding or folia...
24/09/2026

⛏️ Concordant vs Discordant Ore Bodies
The key difference is geometry:
🔹 Concordant ore bodies follow the bedding or foliation of the host rock.
🔹 Discordant ore bodies cut across bedding, foliation, or other planar structures.
📌 Easy way to remember:
Concordant = follows the layers
Discordant = cuts across the layers
Understanding this relationship helps interpret ore-body geometry, structural controls, and exploration targets.

24/09/2026

A quick look at where precious metals like gold, silver, and PGMs hide in the Earth's crust and how they form.

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