**Author details**

*Updates in Volcanology – Transdisciplinary Nature of Volcano Science*

abundant than that of the early phreatomagmatic stages.

attested by lacustrine deposits.

of the eruptive center.

**Acknowledgements**

Two important eruptive sequences marked the first phreatomagmatic phase composed of stratified deposits with an abundant lithic fraction of limestone from the Liasic basement and juvenile pyroclasts. The accidental lithics decrease during the emissive process. This phreatomagmatic activity is initiated by lake water

A second explosive phase of the strombolian eruption style follows the first phreatomagmatic phase. It begins with the effusion of a thick basalt flow due to a collapse inclined slightly to the west, and then it is a pyroclastic plume that will be launched with the fallout of different sizes and shapes depending on the proximity

The last pyroclastic breccia surrounds the crater of LNH. It occurs in discontinuous pyroclastic deposits with well-sorted bedding where the fraction of lithics is less

The tectonic analysis allowed the reconstruction of the stress systems and the highlighting of the mechanisms of syn-eruptive tectonics which had an important impact on the transition of the eruptive style (phreatomagmatic-strombolian). LNH is only one example of the 105 monogenic volcanoes of the Causse of the Middle Atlas, this study represents a first step towards the discovery of this province at the scale of volcanoes, in order to build a model of volcanic dynamics in this region, starting from the approaches mentioned above. Scientific knowledge can be exploited in addition to the natural potentialities of the region to build a model of development that fits with the particularities of this territory. Finally, the richness of the Causse of the Middle Atlas in recent monogenic volcanoes with well-preserved forms in a karstic geological context, as well as the great variety of morphology, both in terms of flows and volcanic devices, make this territory a privileged area to establish a natural geopark accessible to all and easily mediatized.

This work is part of the framework of the research project entitled:

Van Wyke de Vries for their contribution in this project.

Multidisciplinary research on the Geomaterials and Volcanic Geosites of Morocco: the need for their valorization and exploitation in the prospects for sustainable development, supported and financed by Hassan II Academy of Sciences and Techniques and staged in partnership with a consortium of institutions composed of the Faculty of Sciences of Hassan II University— Casablanca, the Scientific Institute in Rabat and the Faculty of Sciences and Techniques of Hassan II University—Mohammadia. Special thanks to Pr. Pierre Boivin and Pr. Benjamen

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Sara Mountaj\*, Hassan Mhiyaoui, Toufik Remmal, Samira Makhoukhi and Fouad El Kamel Faculty of Sciences Aïn Chock, Hassan II University, Casablanca, Morocco,

\*Address all correspondence to: sara.mountaj@gmail.com

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
