# The gabbro rings are Central Atlantic Magmatic Province sills of 230 to 200 Ma, domed about 100 million years later

> Still possible: The gabbros are two sills of the Central Atlantic Magmatic Province, intruded flat into the sedimentary sequence between 230 and 200…

Source: https://mysteriesdept.com/mysteries/eye-of-the-sahara/answers/ANS0DCKS8FZBTJG/the-gabbro-rings-are-central-atlantic-magmatic-province  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Questions](https://mysteriesdept.com/questions)[Eye of the Sahara and Atlantis](https://mysteriesdept.com/mysteries/eye-of-the-sahara)[When were the gabbro ring bodies of the Richat emplaced?](https://mysteriesdept.com/mysteries/eye-of-the-sahara/questions/QST0DCKRG957638/when-were-the-gabbro-ring-bodies-of-the-richat-emplaced)Answer

Answer · Eye of the Sahara and Atlantis

# The gabbro rings are Central Atlantic Magmatic Province sills of 230 to 200 Ma, domed about 100 million years later

The gabbros are two sills of the Central Atlantic Magmatic Province, intruded flat into the sedimentary sequence between 230 and 200 million years ago and bent into rings when the Cretaceous alkaline intrusion domed them about 100 million years later.

**Still possible** Answers **1** question0

## Where it stands

**Still possible** One piece of evidence for, two against. It needs two reviews to be accepted.

## What it predicts

- A robust age on the gabbros (for example U-Pb on zircon or baddeleyite) near 200 Ma.
- Gabbro chemistry matching the CAMP groups of north-west Africa.
- The gabbro bodies lie parallel to the bedding, as sills, and are folded with it.

## What would rule it out

- A robust gabbro age within the Cretaceous complex's range, about 104 to 94 Ma.
- Field evidence that the gabbros cut across the bedding as steep ring dykes.

## Evidence 1 for · 2 against

[The gabbros' chemistry matches the two CAMP groups best represented in north-west Africa](https://mysteriesdept.com/mysteries/eye-of-the-sahara/evidence/EVD0DCKSGVZ9GNT/the-gabbros-chemistry-matches-the-two-camp-groups-best)

Suggestive

FOR

[Matton and colleagues mapped the basalts as subvertical ring dikes, not sills](https://mysteriesdept.com/mysteries/eye-of-the-sahara/evidence/EVD0DCKSHFEKGXN/matton-and-colleagues-mapped-the-basalts-as-subvertical-ring)

Suggestive

AGAINST

[The 40Ar/39Ar analyses of the gabbros gave no robust age](https://mysteriesdept.com/mysteries/eye-of-the-sahara/evidence/EVD0DCKSHRYV5N1/the-40ar-39ar-analyses-of-the-gabbros-gave-no-robust-age)

Supported

AGAINST

## The questions it answers

[When were the gabbro ring bodies of the Richat emplaced?](https://mysteriesdept.com/mysteries/eye-of-the-sahara/questions/QST0DCKRG957638/when-were-the-gabbro-ring-bodies-of-the-richat-emplaced)

Part of [How did the Richat Structure form?](https://mysteriesdept.com/mysteries/eye-of-the-sahara/questions/QST0DCKRBKSRCJA/how-did-the-richat-structure-form)

Open3 answers, none ahead

## Cite it

```
Mysteries Department. (2026). The gabbro rings are Central Atlantic Magmatic Province sills of 230 to 200 Ma, domed about 100 million years later [Answer ANS0DCKS8FZBTJG]. https://mysteriesdept.com/r/ANS0DCKS8FZBTJG
```

Key

**ANS** 0DCKS8FZBTJG

Kind

Answer · hypothesis

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

Version

1

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

Every record is open data. Take this one as JSON, with its links and its history.

[JSON](https://mysteriesdept.com/api/v1/records/ANS0DCKS8FZBTJG)