# Carbonatite dated 99 ± 5 Ma and breccia feldspar 98.2 ± 2.6 Ma tie the hydrothermal breccia to Cretaceous magmatism

> Apatite fission tracks date the carbonatite to 99 ± 5 million years, and 40Ar/39Ar on new-grown potassium feldspar in the breccia's internal sediment…

Source: https://mysteriesdept.com/mysteries/eye-of-the-sahara/evidence/EVD0DCKS0C49HJ3/carbonatite-dated-99-5-ma-and-breccia-feldspar-98-2-2-6-ma  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Eye of the Sahara and Atlantis](https://mysteriesdept.com/mysteries/eye-of-the-sahara)Evidence

Evidence · Eye of the Sahara and Atlantis

# Carbonatite dated 99 ± 5 Ma and breccia feldspar 98.2 ± 2.6 Ma tie the hydrothermal breccia to Cretaceous magmatism

Apatite fission tracks date the carbonatite to 99 ± 5 million years, and 40Ar/39Ar on new-grown potassium feldspar in the breccia's internal sediment gives 98.2 ± 2.6 million years, so the breccia formed with the magmatism.

Established0

## What it bears on 1 answer

[A buried alkaline intrusion domed the rocks about 100 million years ago; erosion cut the dome into rings](https://mysteriesdept.com/mysteries/eye-of-the-sahara/answers/ANS0DCKRQ94902X/a-buried-alkaline-intrusion-domed-the-rocks-about-100)

Still possible

FOR

## Cite it

```
Mysteries Department. (2026). Carbonatite dated 99 ± 5 Ma and breccia feldspar 98.2 ± 2.6 Ma tie the hydrothermal breccia to Cretaceous magmatism [Evidence EVD0DCKS0C49HJ3]. https://mysteriesdept.com/r/EVD0DCKS0C49HJ3
```

Key

**EVD** 0DCKS0C49HJ3

Kind

Evidence

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[Session 1](https://mysteriesdept.com/mysteries/eye-of-the-sahara/sessions/SES0DCKZYK2CKXF/session-1-the-eye-of-the-sahara-and-the-atlantis-claim) · 28 Oct 2026

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