Abstract
Abstract Late Cretaceous dykes and lavas from central-eastern coastal Madagascar (Vatomandry and Mahatsara districts) span a compositional range from basalt to rhyolite. The dykes strike N–S, parallel to the coast, and intrude the Precambrian schists and gneisses of the area. 40Ar/39Ar age determinations on rhyolite from Sakanila massif (western Vatomandry) gave an age of 86.4 ± 0.3 Ma, which is statistically equivalent to the mean age of eastern rifted-margin rocks of Madagascar. Basaltic dykes are generally tholeiitic varying from olivine-normative to quartz-normative, and characterized by relatively low MgO (4.8–8.0 wt%), Cr (61–341 ppm) and Ni (36–128 ppm) contents. The mantle-normalized diagrams have bell-shaped patterns, with the most Mg-rich dykes having <10 times mantle values. The most Fe-rich ferrobasalts have similar patterns displaced at higher element concentrations, but with evident Sr and Ti troughs. Silicic lavas and dykes are dacites and rhyolites, and are characterized by low CaO, MgO, Fe2O3t, TiO2 and P2O5 and high SiO2, K2O, Ba and Rb. The silicic rocks are enriched in light lanthanides (LREE) and have radiogenic initial 87Sr/86Sr ratios (0.70551–0.70833) and negative initial ɛNdi values (–5.6 to –2.5). The magmatic evolution of the mafic dykes is dominated by fractional crystallization of plagioclase and clinopyroxene with minor olivine. The Vatomandry silicic rocks are the result of prolonged fractional crystallization from basalt parental magmas coupled with small amounts of crustal contamination.
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References
Besairie H, Collignon M (1972) Géologie de Madagascar I – Les terraines sédimentaires. Ann Geol Madagascar 35: 553 pp
Boynton WV (1984) Cosmochemistry of the rare earth elements: Meteorite studies. In: Henderson P (ed), Rare Earth Element Geochemistry. Elsevier, Amsterdam: 63–114
Cucciniello C, Langone A, Melluso L, Morra V, Mahoney JJ, Meisel T, Tiepolo M (2010) U-Pb ages, Pb-Os isotopes ratios, and platinum-group element (PGE) composition of the West-Central Madagascar flood basalt province. J Geol 118: 523–541
DePaolo DJ (1981) Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization. Earth Planet Sci Lett 53: 189–202
de Wit MJ (2003) Madagascar: Heads it’s a continent, tails It’s an island. Ann Rev Earth Planet Sci 31: 213–248
Esawi EK (2004) AMPH-CLASS: An Excel spreadsheet for the classification and nomenclature of amphiboles based on the 1997 recommendations of the International Mineralogical Association. Comput Geosci 30: 753–760
Garland F, Hawkesworth CJ, Mantovani MSM (1995) Description and petrogenesis of the Paraná rhyolites, southern Brazil. J Petrol 36: 1193–1227
Gradstein FM, Ogg JG, Smith AG (2005) A Geologic Time Scale 2004. Cambridge University Press, UK
Grove TL, Gerlach DC, Sando TW (1982) Origin of calcalkaline series lavas at Medicine Lake Volcano by fractionation, assimilation and mixing. Contrib Mineral Petrol 80: 160–182
Heltz RT (1976) Phase relations of basalts in their melting ranges at PH2O = 5 kb. Part II melt compositions. J Petrol 17: 139–193
Irvine TN, Baragar WRA (1971) A guide to the chemical classification of the common rocks. Canadian J Earth Sci 8: 523–548
Janney PE, le Roex AP, Carlson RW (2005) Hafnium isotope and trace element constraints on the nature of mantle heterogeneity beneath the central Southwest Indian Ridge (13°E to 47°E). J Petrol 46: 2427–2464
Kinzler RJ, Grove TL (1992) Primary magmas of mid-ocean ridge basalts 1. Experiments and methods. J Geophys Res 97: 6885–6906
Kirstein LA, Peate DW, Hawkesworth CJ, Turner SP, Harris C, Mantovani MSM (2000) Early Cretaceous basaltic and rhyolitic magmatism in southern Uruguay associated with the opening of the South Atlantic. J Petrol 41: 1413–1438
Kröner A, Hegner E, Collins AS, Windley BF, Brewer TS, Razakamanana T, Pidgeon RT (2000) Age and magmatic history of the Antananarivo Block, Central Madagascar, as derived from zircon geochronology and Nd isotopic systematics. Am J Sci 300: 251–288
Kumar A, Pande K, Venkatesan TR, Bhaskar Rao YJ (2001) The Karnataka Late Cretaceous dikes as products of the Marion hot spot at the Madagascar – India breakup event: Evidence from 40Ar/39Ar geochronology and geochemistry. Geophys Res Lett 228: 2715–2718
Le Bas MJ, Le Maitre RW, Streckeisen A, Zanettin B (1986) A chemical classification of volcanic rocks based on the total alkali – silica diagram. J Petrol 27: 745–750
Lepage LD (2003) ILMAT: An Excel worksheet for ilmenite-magnetite geothermometry and geobarometry. Comput Geosci 29: 673–678
le Roex AP (1987) Source regions of mid-ocean ridge basalts: Evidence for enrichment processes. In: Menzies MA, Hawkesworth CJ (eds) Mantle Metasomatism. Academic Press, New York: 389–422
Lustrino M, Marrazzo M, Melluso L, Tassinari CCG, Brotzu P, Gomes CB, Morbidelli L, Ruberti E (2010) Petrogenesis of early cretaceous silicic volcanism in SE Uruguay: The role of mantle and crustal sources. Geochem J 44: 1–22
Mahoney JJ, Nicollet C, Dupuy C (1991) Madagascar basalts: Tracking oceanic and continental sources. Earth Planet Sci Lett 104: 350–363
Mahoney JJ, Saunders AD, Storey M, Randriamanantenasoa A (2008) Geochemistry of the Volcan de l’Androy basalt-rhyolite complex, Madagascar Cretaceous igneous province. J Petrol 49: 1069–1096
McDougall I, Harrison TM (1999) Geochronology and Thermochronology by the 40Ar/39Ar Method, 2nd ed. Oxford University Press, New York
Melluso L, Cucciniello C, Petrone CM, Lustrino M, Morra V, Tiepolo M, Vasconcelos L (2008) Petrology of Karoo volcanic rocks in the southern Lebombo monocline, Mozambique. J Afr Earth Sci 52: 139–151
Melluso L, Morra V, Brotzu P, D’Antonio M, Bennio L (2002) Petrogenesis of the late cretaceous tholeiitic magmatism in the passive margins of northeastern Madagascar. In: Menzies MA, Ebinger CJ, Baker J (eds) Volcanic Rifted Margins, Special Paper. Geological Society of America, Boulder, CO vol 362: 83–98
Melluso L, Morra V, Brotzu P, Franciosi L, Grifa C, Lustrino M, Morbidelli P, Riziky H, Vincent M (2007) The Cenozoic alkaline magmatism in central-northern Madagascar: A brief overview. Per Mineral 76: 169–180
Melluso L, Morra V, Brotzu P, Franciosi L, Petteruti Liebercknecht AM, Bennio L (2003) Geochemical provinciality in the Cretaceous magmatism of northern Madagascar, and mantle source implications. J Geol Soc London 160: 477–488
Melluso L, Morra V, Brotzu P, Mahoney JJ (2001) The Cretaceous igneous province of central-western Madagascar: Evidence for heterogeneous mantle sources, crystal fractionation and crustal contamination. J Petrol 42: 1249–1278
Melluso L, Morra V, Brotzu P, Razafiniparany A, Ratrimo V, Razafimahatratra D (1997) Geochemistry and Sr-isotopic composition of the late Cretaceous flood basalt sequence of northern Madagascar: Petrogenetic and geodynamic implications. J Afr Earth Sci 34: 371–390
Melluso L, Morra V, Brotzu P, Tommasini S, Renna MR, Duncan RA, Franciosi L, d’Amelio F (2005) Geochronology and petrogenesis of the Cretaceous Antampombato-Ambatovy complex and associated dyke swarm, Madagascar. J Petrol 46: 1963–1996
Melluso L, Morra V, Fedele L (2006) An overview of phase chemistry and magmatic evolution in the Cretaceous flood basalt province of northern Madagascar. Per Mineral 75: 175–188
Melluso L, Sheth HC, Mahoney JJ, Morra V, Petrone CM, Storey M (2009) Correlations between silicic volcanic rocks of the St Mary’s Islands (southwestern India) and eastern Madagascar: Implications for Late Cretaceous India-Madagascar reconstructions. J Geol Soc Lond 166: 1–12
Melluso L, Srivastava RK, Guarino V, Zanetti A, Sinha AK (2010) Mineral compositions and magmatic evolution of the Sung Valley ultramafic-alkaline-carbonatitic complex (NE India). Can Mineral 48: 205–229. doi:10.3749/canmin.48.1.205
Pande K, Sheth HC, Bhutani R (2001) 40Ar-39Ar age of the St. Mary’s Islands volcanics, southern India: Record of India-Madagascar break-up on the Indian subcontinent. Earth Planet Sci Lett 193: 39–46
Putirka K (2008) Thermometers and barometers for volcanic systems. In: Putirka K, Tepley F (eds) Minerals, Inclusions and Volcanic Processes. Rev Mineral Geochem, vol 69. American Mineralogical Society, Washington, DC: 61–120
Rehkämper M, Hofmann AW (1997) Recycled ocean crust and sediment in Indian Ocean MORB. Earth Planet Sci Lett 147: 93–106
Roeder PL, Emslie RF (1970) Olivine-liquid equilibrium. Contrib Mineral Petrol 29: 275–289
Ronga F, Lustrino M, Marzoli A, Melluso L (2010) Petrogenesis of a basalt-comendite-pantellerite rock suite: The Boseti volcanic complex (main Ethiopian rift). Mineral Petrol 98: 227–243
Schnetger B (1994) Partial melting during the evolution of the amphibolite- to granulite-facies gneisses of the Ivrea Zone, northern Italy. Chem Geol 113: 71–101
Sheth HC, Melluso L (2008) The Mount Pavagadh volcanic suite, Deccan Traps: Geochemical stratigraphy and magmatic evolution. J Asian Earth Sci 32: 5–21
Storey M, Mahoney JJ, Saunders AD (1997) Cretaceous basalts in Madagascar and the transition between plume and continental lithosphere mantle sources. In: Mahoney JJ, Coffin MF (eds) Large Igneous Provinces: Continental, Oceanic and Planetary Flood Volcanism, Geophysial Monograph, vol 100. Amercian Geophysical Union, Washington, DC: 95–122
Storey M, Mahoney JJ, Saunders AD, Duncan RA, Kelley SP, Coffin MF (1995) Timing of hot spot-related volcanism and the breakup of Madagascar and India. Science 267: 852–855
Sun S-S, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders AD, Norry MJ (eds) Magmatism in the Ocean Basins, Special Publication, vol 42. Geological Society of London, London: 313–345
Torsvik TH, Tucker RD, Ashwal LD, Carter LM, Jamtveit B, Vidyadharan KT, Venkataramana P (2000) Late Cretaceous India- Madagascar fit and timing of break-up related magmatism. Terra Nova 12: 220–224
Torsvik TH, Tucker RD, Ashwal LD, Eide EA, Rakotosolofo NA, de Wit MJ (1998) Late Cretaceous magmatism of Madagascar: Paleomagnetic evidence for a stationary hotspot. Earth Planet Sci Lett 164: 221–232
Wareham CD, Millar IL, Vaughan APM (1997) The generation of sodic granite magmas, western Palmer Land, Antarctic Peninsula. Contrib Mineral Petrol 128: 81–96
Windley BF, Razafiniparany A, Razakamanana T, Ackermand D (1994) Tectonic framework of the Precambrian of Madagascar and its Gondwana connections: A review and reappraisal. Geol Rundsch 83: 642–659
Acknowledgements
We thank Roberto de’ Gennaro, Sergio Bravi, Marianna Marrazzo and Luigi Franciosi for their help with data acquisition and field work. This project has been granted by MURST (COFIN 2008) grants to L. Melluso. The careful review of Hetu Sheth and the editorial comments of Rajesh Srivastava were very useful for the preparation of a revised version.
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Cucciniello, C. et al. (2011). Petrology and Geochemistry of Cretaceous Mafic and Silicic Dykes and Spatially Associated Lavas in Central-Eastern Coastal Madagascar. In: Dyke Swarms:Keys for Geodynamic Interpretation. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12496-9_21
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