An erupted migmatite from Cerro del Hoyazo, SE Spain

Zeck, H. P.

doi:10.1007/bf00373202

Cited by 128 publications

(91 citation statements)

References 23 publications

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“…The Beni Bousera peridotite (Rif Mountains, Morocco) is particularly analogous to Seram owing to its association with mylonitised kinzigites (aluminous garnet-sillimanite granulites) which have also been interpreted to form the hanging wall above sheared peridotites exhumed beneath a low-angle detachment (Afiri et al, 2011). Furthermore, the El Hoyazo region of the Betic Cordillera is one of very few other localities aside from Ambon where ambonites have been erupted, which similarly contain xenoliths of their granulitic protolith (Zeck, 1970;Zeck and Williams, 2002;Acosta-Vigil et al, 2010;Álvarez-Valero and Waters, 2010).…”

Section: Discussionmentioning

confidence: 99%

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback

2013

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Abstract. The island of Seram, which lies in the northern part of the 180 • -curved Banda Arc, has previously been interpreted as a fold-and-thrust belt formed during arc-continent collision, which incorporates ophiolites intruded by granites thought to have been produced by anatexis within a metamorphic sole. However, new geological mapping and a re-examination of the field relations cause us to question this model. We instead propose that there is evidence for recent and rapid N-S extension that has caused the hightemperature exhumation of lherzolites beneath low-angle lithospheric detachment faults that induced high-temperature metamorphism and melting in overlying crustal rocks. These "Kobipoto Complex" migmatites include highly residual AlMg-rich garnet + cordierite + sillimanite + spinel + corundum granulites (exposed in the Kobipoto Mountains) which contain coexisting spinel + quartz, indicating that peak metamorphic temperatures likely approached 900 • C. Associated with these residual granulites are voluminous MioPliocene granitic diatexites, or "cordierite granites", which crop out on Ambon, western Seram, and in the Kobipoto Mountains and incorporate abundant schlieren of spineland sillimanite-bearing residuum. Quaternary "ambonites" (cordierite + garnet dacites) emplaced on Ambon were also evidently sourced from the Kobipoto Complex migmatites as demonstrated by granulite-inherited xenoliths. Exhumation of the hot peridotites and granulite-facies Kobipoto Complex migmatites to shallower structural levels caused greenschistto lower-amphibolite facies metapelites and amphibolites of the Tehoru Formation to be overprinted by sillimanite-grade metamorphism, migmatisation, and limited localised anatexis to form the Taunusa Complex. The extreme extension required to have driven Kobipoto Complex exhumation evidently occurred throughout Seram and along much of the northern Banda Arc. The lherzolites must have been juxtaposed against the crust at typical lithospheric mantle temperatures in order to account for such high-temperature metamorphism and therefore could not have been part of a cooled ophiolite. In central Seram, lenses of peridotites are incorporated with a major left-lateral strike-slip shear zone (the "Kawa Shear Zone"), demonstrating that strike-slip motions likely initiated shortly after the mantle had been partly exhumed by detachment faulting and that the main strike-slip faults may themselves be reactivated and steepened lowangle detachments. The geodynamic driver for mantle exhumation along the detachment faults and strike-slip faulting in central Seram is very likely the same; we interpret the extreme extension to be the result of eastward slab rollback into the Banda Embayment as outlined by the latest plate reconstructions for Banda Arc evolution.

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Section: Discussionmentioning

confidence: 99%

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback

2013

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“…7). More widespread calc-alkaline to shoshonitic and ultrapotassic volcanism occurred on the southeast coast of Spain and in Northern Africa from the Early Miocene to Pliocene (Zeck 1970;1998;Nixon et al 1984;Venturelli et al 1984a;Hertogen et al 1985;Di Battistini et al 1987;Louni-Hacini et al 1995, El Bakkali et al 1998Benito et al 1999;Turner et al 1999;Coulon et al 2002;Duggen et al 2004;Gill et al 2004;Fig. 6).…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

Downes

Seghedi³

2006

Memoirs

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“…The relatively finegrained microstructures indicate relatively rapid crystallization. The enclave magma crystallized more rapidly than the felsic magma (Zeck 1970), once thermal equilibrium has been established. The felsic and mafic magmas could remain separate (Yoder 1973), particularly if small volumes of more mafic magma are enclosed in large volumes of felsic magma and if mixing is minimal (Kouchi and Sunagawa 1983), because chilling increases the viscosity of the more mafic globules, as well as promoting viscosity during rapid crystallization.…”

Section: Fractionation Processesmentioning

confidence: 99%

Geochemical, zircon U–Pb dating and Sr–Nd–Hf isotopic constraints on the age and petrogenesis of an Early Cretaceous volcanic-intrusive complex at Xiangshan, Southeast China

Yang

Jiang

et al. 2010

Miner Petrol

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The Late Mesozoic geology of Southeast China is characterized by extensive Jurassic to Cretaceous magmatism consisting predominantly of granites and rhyolites and subordinate mafic rocks, forming a belt of volcanic-intrusive complexes. The Xiangshan volcanicintrusive complex is located in the NW region of the belt and mainly contains the following lithologies: rhyodacite and rhyodacitic porphyry, porphyritic lava, granite porphyry with mafic microgranular enclaves, quartz monzonitic porphyry, and lamprophyre dyke. Major and trace-element compositions, zircon U-Pb dating, and Sr-Nd-Hf isotopic compositions have been investigated for these rocks. The precise SHRIMP and LA-ICP-MS zircon U-Pb dating shows that the emplacement of various magmatic units at Xiangshan took place within a short time period of less than 2 Myrs. The stratigraphically oldest rhyodacite yielded a zircon U-Pb age of 135 ± 1 Ma and the overlying rhyodacitic porphyry has an age of 135±1 Ma. Three porphyritic lava samples yielded zircon U-Pb ages of 136± 1 Ma, 132±1 Ma, and 135±1 Ma, respectively. Two subvolcanic rocks (granite porphyry) yielded zircon U-Pb ages of 137±1 Ma and 137±1 Ma. A quartz monzonitic porphyry dyke, which represented the final stage of magmatism at Xiangshan, also yielded a zircon U-Pb age of 136±1 Ma. All these newly obtained precise U-Pb ages demonstrate that the entire magmatic activity at Xiangshan was rapid and possibly took place at the peak of extensional tectonics in SE China. The geochemical data indicate that all these samples from the volcanic-intrusive complex have an A-type affinity. Sr-Nd-Hf isotopic data suggest that the Xiangshan volcanic-intrusive complex derived mainly from remelting of Paleo-Mesoproterozoic crust without significant additions of mantle-derived magma. However, the quartz monzonitic porphyry, which has zircon Hf model ages older than the whole-rock Nd model ages, and which has ε Nd (T) value higher than the other rocks, may indicate involvement of a subordinate younger mantle-derived magma in its origin. Geochemical data indicate that the various rocks show variable REE patterns and negative anomalies of Ba, Nb, Sr, P, Eu and Ti in the trace element spidergrams, suggesting that these rocks may have undergone advanced fractional crystallization with separation of plagioclase, K-feldspar and accessory minerals such as allanite. We suggest that this Cretaceous volcanic-intrusive complex formed in an extensional environment, and the formation of the Xiangshan mafic microgranular enclaves can be explained by the injection of mafic magma from a deeper seated mantle magma chamber into a hypabyssal felsic magma chamber at the crustal emplacement levels.

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An erupted migmatite from Cerro del Hoyazo, SE Spain

Cited by 128 publications

References 23 publications

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Geochemical, zircon U–Pb dating and Sr–Nd–Hf isotopic constraints on the age and petrogenesis of an Early Cretaceous volcanic-intrusive complex at Xiangshan, Southeast China

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