+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Origin and evolution of post-collisional magmatism; coeval Neoproterozoic calc-alkaline and alkaline suites of the Sinai Peninsula



Origin and evolution of post-collisional magmatism; coeval Neoproterozoic calc-alkaline and alkaline suites of the Sinai Peninsula



Chemical Geology 269.3-4



Two Late Neoproterozoic post-collisional igneous suites, calc-alkaline (CA) and alkaline-peralkaline (Alk), widely occur in the northernmost part of the Arabian-Nubian Shield. In Sinai (Egypt) and southern Israel they occupy up to 80% of the exposed basement. Recently published U-Pb zircon geochronology indicates a prolonged and partially overlapping CA and Alk magmatism at 635-590 Ma and 608-580 Ma, respectively. Nevertheless in each particular locality CA granitoids always preceded Alk plutons. CA and Alk igneous rocks have distinct chemical compositions, but felsic and mafic rocks in general and granitoids from the two suites in particular cannot be distinguished by their Nd, Sr and O isotope ratios. Both suites are characterized by positive epsilon(Nd(T)) values, from +1.5 to +6.0 (150 samples, 28 of them are new analyses), but predominance of juvenile crust in the region prevents unambiguous petrogenetic interpretation of the isotope data. Comparison of geochemical traits of felsic and mafic rocks in each suite suggests a significant contribution of mantle-derived components to the silicic magmas. Model calculation shows that the alkaline granite magma could have been produced by partial ( approximately 20%) melting of rocks corresponding to K-rich basalts. Material balance further suggests that granodiorite and quartz monzonite magmas of the CA suite could form by mixing of the granite and gabbro end-members at proportions of 85/15. In the Alk suite, alkali feldspar and peralkaline granites have evolved mainly by fractional crystallization of feldspars and a small amount of mafic minerals from a parental syenogranite melt. Thus the protracted, 20 m.y. long, contemporaneous CA and Alk magmatism in the northern ANS requires concurrent tapping of two distinct mantle sources. Coeval emplacement of CA and Alk intrusive suites was described in a number of regions throughout the world.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 037120979

Download citation: RISBibTeXText

DOI: 10.1016/j.chemgeo.2009.09.010


Related references

Trace elements and Sr-Nd-Pb isotopes of K-rich, shoshonitic, and calc-alkaline magmatism of the Western Mediterranean Region: Genesis of ultrapotassic to calc-alkaline magmatic associations in a post-collisional geodynamic setting. Lithos 107(1-2): 68-92, 2009

Origin and evolution of overlapping calc-alkaline and alkaline magmas The Late Palaeozoic post-collisional igneous province of Transbaikalia Russia. Lithos 125(3-4): 845-874, 2011

Post-collisional transition from calc-alkaline to alkaline magmatism during transcurrent deformation in the southernmost Dom Feliciano Belt (Braziliano-Pan-African, Uruguay). Lithos 98(1-4): 141-159, 2007

Contrasting origin of post-collisional high-K calc-alkaline and shoshonitic versus alkaline and peralkaline granitoids; the use of sliding normalization. Lithos 45(1-4): 1-28, 1998

The evolution of Neoproterozoic magmatism in Southernmost Brazil: shoshonitic, high-K tholeiitic and silica-saturated, sodic alkaline volcanism in post-collisional basins. Anais Da Academia Brasileira de Ciencias 78(3): 573-589, 2006

Post-collisional magmatism in the northern Arabian-Nubian Shield The geotectonic evolution of the alkaline suite at Gebel Tarbush area, south Sinai, Egypt. Chemie der Erde - Geochemistry 71(3): 0-266, 2011

The succession of high-K calc-alkaline to alkaline granitic rocks in collisional belts tracks post-collisional crustal thinning. Documents - BR, 1999

Neoproterozoic calc-alkaline peraluminous granitoids of the Deleihimmi Pluton, central Eastern Desert, Egypt; implications for transition from late- to post-collisional tectonomagmatic evolution in; the northern Arabian-Nubian Shield. Geological Journal 46.6, 2011

Tectonic significance of late precambrian calc-alkaline and alkaline magmatism in Saint Katherina area, Southern Sinai, Egypt. Geologica Acta 5(3): 255-272, 2007

Coeval potassic and sodic calc-alkaline series in the post-collisional Hercynian Tanncherfi intrusive complex, northeastern Morocco; geochemical, isotopic and geochronological evidence. Lithos 45(1-4): 371-393, 1998

Early Miocene post-collisional calc-alkaline magmatism along the easternmost segment of the Periadriatic fault system (Slovenia and Croatia). Mineralogy and Petrology 54(3-4): 225-247, 1995

Triassic-Jurassic calc-alkaline intrusions of the Orgheon Zone, South Korea; active margin or post-collisional magmatism?. Comptes Rendus de l'Academie des Sciences, Serie 2, Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre 313(4): 435-442, 1991

Post-collisional alkaline magmatism on the Taquarembo Plateau; a well-preserved Neoproterozoic-Cambrian plutono-volcanic association in southern Brazil. International Geology Review 41(12): 1082-1098, 1999

Post-collisional transition from calc-alkaline to alkaline volcanism during the Neogene in Oranie (Algeria); magmatic expression of a slab breakoff. Lithos 62(3-4): 87-110, 2002

Late Neoproterozoic volcano-sedimentary successions of central Sinai Egypt; tracing the evolution of post-collisional magmatism and its relation to A-type granite formation. Department of Geosciences and Geography. C 2: 14-17, 2010