Chouaïb Doukkali University, Faculty of Sciences and

Geological Society of Africa

Nasser ENNIH ennih@ucd.ac.ma

Abderrahim EL ACHHEB<elachheb@ucd.ac.ma>

Abdelkrim EL ARCHI <elarchi@ucd.ac.ma>

Mohamed EL HOUICHA <elhouicha@ucd.ac.ma>

Ezzoura ERRAMI <errami@ucd.ac.ma>

El Mostafa ETTACHFINI <ettachfini@ucd.ac.ma>

Abdelilah FEKKAK <fekkak@ucd.ac.ma>

Abdellatif JOUHARI <jouhari@ucd.ac.ma>

Mohamed OUADIA <ouadia@ucd.ac.ma>

Brahim OUAJHAIN <brahimouajhain@ucd.ac.ma>

Hafid SABER <hsaber@ucd.ac.ma>

Abdellatif SOUHEL souhel@ucd.ac.ma

Secretariat of the 19^th Colloquium GSAf

Chouaïb Doukkali University

Faculty of Sciences

Department of Earth Sciences

B.P. 20, 24000, El Jadida, Morocco.

Tel : +212 23 34 23 25. Fax : +212 23 34 21 87 / 34 44 49

e-mail : cag19@ucd.ac.ma

Homepage : www.ucd.ac.ma/geologie/cag19.html

Submission of abstracts, registration form, field trip application…………………………………..30^th September 2001

Acceptance of abstracts, confirmation of field trip, third circular………………………………...……..15^th November 2001

Early payment deadline…..…….………..…..30^th November 2001

The Colloquium will be conducted in French and English. No translation facilities will be available.

The Colloquium will be organized at the Chouaïb Doukkali University, Faculty of Sciences, El Jadida, Morocco .

The best way to travel to El Jadida city is by air via Casablanca which is 100 km away from El Jadida.

A pick-up service may be arranged.

2- Orogenic cycles and related magmatism

3- Rift-related structures and phenomena

4- Ore deposits and Gem minerals

5- Petroleum Geology and Geophysics

6- Cover sequences, Stratigraphy and Palaeontology

7- Hydrogeology and Environmental Geology

8- Geological correlations between Europe and Africa

A total of four post-colloquium field trips are on offer. All trips will began March ^23rd. Fees include a guide book, local transportation, accommodation, breakfast and dinner. The nights before and after the field trip are not included.

Field trips that do not receive enough expression of interest may be cancelled. Payment for such trips will be fully refunded or can be tarnsferred for another trip.

F1- Eburnian and Pan-African Orogeny in the Precambrian domain (Anti-Atlas , Morocco)

The Moroccan Anti-Atlas region south of the South Atlas Fault, contains two segments separated by the Anti-Atlas Major Fault. This two segments consist of (i) a 600-700 Ma old Pan-African segment with arc formations and post-collisional magmatism and (ii) a 2 Ga Eburnian segment in the south with Palaeoproterozoïc metamorphic and granitic basement outcropping within Neoproterozoïc to Palaeozoïc cover. This latter domain corresponds to the northern border of the West African craton. The central Anti-Atlas is a complex area with collided ophiolitic, "arc" and basin terranes. The geodynamic significance of the central and eastern Anti-Atlas during the Pan-African orogenesis is actually very debated. The purpose of this field trip is to provide an overview over the three structural units of the Anti-Atlas. A NE-SW transect will be presented from the Tazenakht Eburnian inlier (Western Anti-Atlas) to Pan-African Saghro inlier (Eastern Anti-Atlas) across the Bou-Azzer inlier (Central Anti-Atlas).

The new observations suggest that this classically subdivision is inappropriate in that Eburnian and Pan-African materials occur throughout the Anti-Atlas region. Many propositions will be seriously discussed.

Minimum: 18 participants

F2- Jurassic reef-rimmed carbonate shelves in the Agadir basin (western Atlas of Morocco): facies, diagenesis and basin development.

The Jurassic of the Agadir Basin displays a highly variable carbonate-clastic shelf series with marginal marine to outer shelf carbonate ramps and shelf interior basins. The field trip will deal with the Liassic to Portlandian facies, carbonate and clastic diagenesis, dolomitization, sedimentary geometries and the basin development in the western High Atlas. Special focus will be on depositional patterns and controls of the late Jurassic reef-rimmed carbonate shelves in this part of the Northwest African continental margin. We will visit representative late Jurassic outcrops between Tizgui N´Chorfa (Witdoun), Ankloute/Immouzzer and Cap Ghir, which cover an East-West transect through the Late Jurassic basin.

Carbonate shelf series including reefs will be compared in terms of their original composition, sediment fabric and relative sea-level signals, which controlled diagenesis. Sequence – stratigraphic aspects will be discussed as well.

Minimum : 10, maximum : 20 participants

F3- Alpine evolution of the Atlasic System in central Morocco

From the coastal town of El Jadida, the trip will cross the Moroccan central Meseta, and the north part of the central High Atlas mountains. The Alpine evolution of the Moroccan Atlasic domain will be illustrated through the following points :

- The Jurassic Rifting in the central high Atlas and the Tethys transgression in the west of Morocco : the sequence stratigraphy of the Lias-Dogger marine deposits from the platform area up to the "duke" region.

- The filling up and the senescence of the middle-upper Jurassic Atlasic rift : the syn-sedimentary tectonics, volcanism and the Dinosaur’s footprints combined with the deltaic and continental red layers of the middle Jurassic up to lower Cretaceous.

- The Cretaceous Atlantic transgression : the sedimentary organization in the Aptian gulfs, and in the vast Cenomano-Turonian platform.

- The border basins of the High Atlas Chain in the process of formation in the upper Cretaceous-Tertiary : visit to the phosphate mines in the Khouribga region with the discussion of the biological crisis impact that occurred at the Cretaceous-Tertiary boundary.

- The Tertiary Atlasic compression : the structural connections between the High Atlas chain and its front area.

The trip will be finished by a guided visit into the historic city of Marrakech.

Minimum: 10, maximum: 24 participants

F4 - Plio-Quaternary formations of the coastal Meseta of Morocco (Larache-Safi): Sedimentology, Hydrogeology, Palaepedology, Neotectonics and Modern Sedimentary Dynamics.

In the coastal Meseta of Morocco, along a distance around 600 km between Larache (NE) and Safi (SW), the Plio-Quaternary formations are formed generally by the calcarenites complex (marine and eolian calcarenites with sporadic intercalated paleosols, shelly limestone and sandstone of the quartzitic substratum, limestone or gypsiferous beds according to the sectors.

During this trip, we will focus our interest on the mode of deposit of the Plio-Quaternary formations (interaction of the two dynamics: marine and eolian), their origin, their post-sedimentary evolution (diagenesis or/and pedogenesis), the geomorphology, the hydrogeology, the paleocoast, the neotectonic activity, which characterizes some sectors.

Minimum : 10, maximum : 24 participants

1. Guided tour to the cities of El Jadida and Azemour……50 Euro
2. Guided tour to the city of Casablanca………………… 70 Euro

The unit of currency in Morocco is the Dirham (Dh). The approximate exchange rates (APril 2001) are:

1 USD = 11.40 Dh ; 1 EURO = 10.2 Dh 

Colloquium participants……………………………………230 Euro

Members of the organizing institutions…………………... 200 Euro

Students……………………… ……………………………100 Euro

Colloquium participants……………………………………250 Euro

Members of the organizing institutions…………………….220 Euro

Students…………………………………….……………….100 Euro

The registration fees include abstracts volume, coffee-breaks, lunches and invitation to the ice-breaker party.

PS. : The receipt or payment coupon must accompany the abstract.

Upon written request, students and young scientists especially from southern countries can apply for support for registration fees and accommodation.

Secretariat of the 19^th Colloquium GSAf

Chouaïb Doukkali University

Faculty of Sciences, Department of Earth Sciences

B.P. 20, 24000, El Jadida, Morocco.

Tel: +212 23 34 23 25

Fax: +212 23 34 21 87

Fax: + 212 23 34 44 49

e-mail: cag19@ucd.ac.ma

Colloquium homepage: www.ucd.ac.ma/geologie/cag19.html

Name/Nom : ……………………………….………………………...

Surname/Prénom : ………………..……………………………….…

Title/Titre :…………………………………………………………...

Institution :…………………………………………………………...…………………………………………………………………….….

Adress/Adresse :……………………………………………………....………………………………………………………………………...………………..……………………………………………………..

Tel/Tél : ………………………………………………….……..……

Fax : ………………………………………………….…………..…..

e-mail :………………………………………………….………….....

Title of Contribution/titre de la contribution :

………………………………………………………………………………………….…………………………………………………...……………………………………….……………………………...…………………………………………………………….………...

Preferred symposium/Symposium choisi : N° :

Oral:  Poster: 

I wish to participate in the following field trip :

Je souhaite participer à l’excursion suivante :

Pick-up service from Casablanca :

Scheduled arrival time :

Fees in Euro

F1- Eburnian to Pan-African Orogeny in the

Precambrian domain (Anti-Atlas , Morocco)

F2- Jurassic reef-rimmed carbonate shelves in the

Agadir Basin

F3- High-Atlas Alpine Orogeny

F4- Atlantic Quaternary littoral sedimentology

Accompanying persons hoping to participate in the

guided city tour of /

Personnes accompagnatrices souhaitant participer

à la visite guidée de :

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Bank transfer/transfert bancaire : WAFA BANK , Mohammed Errafii, El Jadida, Maroc. Compte n° : 019170000-140 030 26796 96-15 (cag19)

Or Tresorerie Provinciale d'El Jadida, Maroc Compte n°: 41013 (cag19)

For written cancellation received at the colloquium secretariat before 15 February 2002, the registration fee less 20% will be refunded. After that date no refund will be possible.

Articles

Abstract form (12 pt centred)