# Plagioclase 40Ar/39Ar modelling places the gabbros at 230 to 200 Ma, not in the Cretaceous

> The first 40Ar/39Ar work on gabbro plagioclase gave no robust age, but numerical modelling of the results places the intrusion between 230 and 200…

Source: https://mysteriesdept.com/mysteries/eye-of-the-sahara/evidence/EVD0DCKSGCEA21B/plagioclase-40ar-39ar-modelling-places-the-gabbros-at-230-to  
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

# Plagioclase 40Ar/39Ar modelling places the gabbros at 230 to 200 Ma, not in the Cretaceous

The first 40Ar/39Ar work on gabbro plagioclase gave no robust age, but numerical modelling of the results places the intrusion between 230 and 200 million years ago.

Suggestive0

## What it bears on 1 answer

[The gabbro rings belong to the same Cretaceous complex, emplaced around 104 to 94 Ma](https://mysteriesdept.com/mysteries/eye-of-the-sahara/answers/ANS0DCKS7XXBARQ/the-gabbro-rings-belong-to-the-same-cretaceous-complex)

Still possible

AGAINST

## Cite it

```
Mysteries Department. (2026). Plagioclase 40Ar/39Ar modelling places the gabbros at 230 to 200 Ma, not in the Cretaceous [Evidence EVD0DCKSGCEA21B]. https://mysteriesdept.com/r/EVD0DCKSGCEA21B
```

Key

**EVD** 0DCKSGCEA21B

Kind

Evidence

Tier

Suggestive

Proposed

[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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