... composition diapirism granites Hercynian Orogeny igneous rocks intrusions lineation Moroccan Atlas Mountains Morocco North Africa plutonic rocks structural analysis structural geology syntectonic processes tectonics Tichka Massif ...

.... The Tichka massif is the only well-exposed massif with over 2,000 m of vertical relief developed. In contrast, the other massifs have been barely unroofed. The Tichka massif contains basic rocks surrounding teardrop-shaped granitic pods. At the contact of the massif with the overlying sediments, large masses...

...Henri Termier; Genevieve Termier Abstract Assemblages of spherical masses found in lower Cambrian deposits southeast of the Tichka massif, Morocco, are considered remains of reef organisms, probably the exoskeletons of sponges. Although the spherical lobes or ovoids do not represent individuals...

... model for the western High Atlas is observed beneath the Hercynian Tichka massif, which rises to an altitude of 3000 m. The tomography indicates a high‐velocity block, oriented northwest–southeast and dipping toward the northwest from a depth of 10 km with P ‐wave velocities ranging from 6 to 7.8 km/s...

...) and their Palaeozoic cover (grey) (TN – Tanncherfi; AB – Aouli-Bou Mia; TZ – Tazekka; TC – Tichka; MC – Maroc Central with Zaer (Z), Oulmes (O) and Ment (M) plutons; R – Rehamna; G – Guemassa). (b) Geological sketch map of the Jebilet massif (modified from Huvelin, 1977...

.... 787 . Vogel , T.A. , and Walker , B.M. , 1975 , The Tichka Massif, Morocco—An example of contemporaneous acidic and basic plutonism : Lithos , v. v. 8 pp. 29 ߝ 38 . Vogel , T.A. , Eichelberger , J.C. , Younker , L.W. , Schuraytz , B.C. , Horkowitz , J.C...

... , 195 – 222 . Vernon R.H. ( 1984 ) Microgranitoid enclaves in granites—globules of hybrid magma quenched in a plutonic environment . Nature , 309 , 438 – 439 . Vogel T.A. Walker B.M. ( 1975 ) The Tichka Massif, Morocco—an example of contemporaneous acidic and basic...

..., which probably continues into the study area to encounter the Tichka massif. Other authors suggest that this tectonic regime continued throughout the Jurassic period ( Brahim et al. 2002 ). In addition, the E–W and ENE–WSW trends were both reactivated as reverse faults ( Fig. 10- a 5 ) during Cenozoic...

... , Z. , and Vidal , P. , 1992 , Petrogenesis of the Hercynian Tichka plutonic complex (Western High Atlas, Morocco): Trace element and Rb-Sr and Sm-Nd isotopic constraints : Earth and Planetary Science Letters , v. v. 108 pp. 29 ’ 44 . Getty , S.R. , and Gromet , L.P. , 1992...

... par des granites tardi-hercyniens (massifs du Tichka et d’Azegour). L’ensemble est affecté par la déformation atlasique à axes de plis majoritairement sub-méridiens et recouvert vers le sud par une sédimentation tabulaire à monoclinale mésozoïque à cénozoïque [ Zerhouni, 1988 ; Ait Ayyad, 2003...

... Kranendonk and Wardle 1997 ); this continued episodically until 1710 Ma ( Scott 1998 ). Fig. 1. Map of field study area. Letters refer to specific units or islands. A, Akpaume intrusion; B, Barth Island intrusion; BLM, Bird Lake massif; C, Carey Island; H, Hettash intrusion; J, Jonathon intrusion; K...

... at present as isolated in the La Clarté granite. The following facies may be defined: This paper is devoted to a particular orbicular structure outcropping in the Ploumanac'h plutonic complex (PPC), French Armorican Massif. The orbicules are made of radiated K-feldspar-quartz shells surrounded...

.... 501 – 545 . Termier H. Termier G. 1970 , Sur une roche crystalline renfermant une ecaille d’Echinoderme (Massif du Tichka, Haut Atlas occidentale, Maroc) : Comptes Rendus Hebdomadaires...

... Massif Ancien de Tichka ( Vogel et al, 1977 ). Its northern limit lay along the flanks of the Moroccan Meseta, a platform region which has remained relatively stable and extensively exposed since it was welded to the African craton about 300.y. ago. The Argana Valley sequence is a proximal clastic...

.... 9. Comparison of the initial isotope ratios of the central Moroccan margin sediments with surrounding possible source areas with data for only Sr and Nd isotopes. Green symbols, Moroccan massifs; yellow symbols, African and Saharan dust sources; and purple symbols, West African Craton. Data...

... = Tichka, Z = Zaër. This paper reports 40 Ar/ 39 Ar ages of igneous and hydrothermal minerals of a representative massive sulfide deposit at Hajar and a vein-type deposit at Tighza, both in the western Meseta, allowing the timing of Pb-Zn mineralization to be discussed. The western Meseta...

...., (1978) Minor-element and Sr-isotope geochemistry of the Tichka massif. Morocco; based on rare earth elements. Contrib. Mineral. Petrol., v. 67 . pp. 379·396. SUBRAMANIAN, K. S., (1979) Molybdenite mineralization associated with acid magmatism in. Tamil Nadu, India. Geol. Surv. India, Spec. PubL, no. 13...

... at endocontacts, which make up the outer ring and the minor stock in the center of the complex. Granosyenites, granites, and leucogranites make up the central stock and separate massifs in the ring. The granitoids of the second group are undeformed; they cut across a swarm of felsic subvolcanic dikes and a linear...

... of the Tuolumne Intrusive Suite, California : Geology , v. 32 p. 433 - 436 . Fernandez , A.N. , and Gasquet , D.R. , 1994 , Relative rheological evolution of chemically contrasted coeval magmas: Example of the Tichka plutonic complex (Morocco) : Contribution to Mineralogy and Petrology , v...