SrNd isotopic record of multi-stage interactions between mantle-derived magmas and crustal components in a collision context — The ultramafic-granitoid association from Vivero (Hercynian belt, NW Spain)

doi:10.1016/0009-2541(96)00027-7

Chemical Geology

Volume 131, Issues 1–4, 30 September 1996, Pages 67-91

https://doi.org/10.1016/0009-2541(96)00027-7 Get rights and content

Abstract

Late-stage, epizonal calc-alkaline granitoids of the Hercynian belt are often associated with coeval more basic rocks. Such granitoids have been the focus of special attention when studying the role of mantle-derived magmas in granitoid genesis. These studies conclude that basic magmas are involved in granitoid production but their contribution to the chemical composition of granitoids is often controversial. The Vivero massif (NW Spain) includes calc-alkaline granitoids and coeval ultramafic and mafic rocks, but these granitoids are syntectonic and intruded into middle-crustal levels during an early stage.

Scattered major- and trace-element chemistry together with heterogeneous SrNd isotopic results preclude an origin of this ultramafic-to-granitoid association by any closed-system fractionation process. Ultramafic rocks include peridotites, pyroxenites and homblendites with ENdi from −3.5 to −1.3 and ( $^{87} Sr^{86} Sr$ )_i ratio from 0.7059 to 0.7080. They are interpreted as cumulates formed by “in situ” fractional crystallization from contaminated basaltic magmas, particularly by interaction with ⁸⁷Sr-enriched fluids. Mafic rocks comprise biotite-amphibole diorites, quartz diorites and tonalites with ϵNd_i from −3.8 to 0.0 and ( $^{87} Sr^{86} Sr$ )_i ratio from 0.7058 to 0.7073. They represent either cumulates or more evolved magmas of calc-alkaline affinity. These rocks display an inverse correlation between the degree of differentiation and the degree of contamination inferred from isotope data. This points to wall-rock assimilation by thermal erosion during ascent of basic magmas up to the middle crust and supports the participation of mantle sources with positive ENd; and ( $^{87} Sr^{86} Sr)_{i} < 0.7058$ .

Granitoids range from amphibole-biotite tonalites, through biotite granodiorites to monzonitic granites. They show an isotopic trend which diverges from that of ultramafic and mafic rocks. ϵENd_i (−6.0 to −1.9) decreases while ( $^{87} Sr^{86} Sr)_{i}$ ratio (0.7061 to 0.7082) increases from tonalites to monzonitic granites, reflecting an increasing contribution of crustal components in more differentiated rocks. Assimilation and fractional crystallization, mixing included, account for such an evolution Contamination of basic magmas by this process occurring at deeper crustal level produced hybrid tonalites and related mafic magmatic enclaves. Only monzonitic granites are interpreted as pure crustal melts. Their HREE fractionated patterns [(Gd/Yb) = 4-5] suggest equilibrium with a garnet-rich residuum. Partial melting of moderate time-integrated Rb/Sr protolith, such as greywackes and/or meta-igneous rocks of intermediate-acid composition, could account for the isotopic composition of these monozogranites.

This example shows that at least some calc-alkaline granitoids of collisional setting are not produced by pure intra-crustal melting. They are formed through a complex, multi-stage hybridization process, involving mantle-derived magmas, crustal components and several concomitant magmatic processes.

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Research paperSrNd isotopic record of multi-stage interactions between mantle-derived magmas and crustal components in a collision context — The ultramafic-granitoid association from Vivero (Hercynian belt, NW Spain)

Abstract

J. Struct. Geof.

Geochim. Cosmochim. Acta.

J. Struct. Geof

Earth Planet. Sci. Lett.

Geochim. Cosmochim. Acta

Earth Planet. Sci. Lett.

Phys. Earth Planet. Inter.

Earth Planet. Sci. Lett.

J. Volcanol. Geotherm. Res.

Chem. Geol.

Chem. Geol.

Phys. Earth Planet. Inter.

Lithos

Chem. Geol.

Chem. Geol.

Earth Planet. Sci. Lett.

Tectonophysics

Chem. Geol.

Phys. Earth Planet. Inter.

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

Local equilibrium of mafic enclaves and granitoids of the Turtle pluton, southeast California: mineral. chemical and isotopic evidence

Am. Mineral.

Relations entre les intrusions des granitoïdes; I'anatexie et le métamorphisme regional considérés principalement du point de vue du rôle dc I'eau: cas de la chame hercynienne des Pyrenees Orientales

Bull. Soc. Géol. Fr.

Enclaves from the A-type granite of the Mégantic Complex

J. Geophys. Res.

Consideraciones petrológicas y cronológicas sobre las rocas hercmicas de Galicia

Cuad. Lab. Xeol. Laxe.

Recycling processes in granite-granodiorite complex genesis: the Quérigut case studied by NdSr isotope systematics

Earth Planet. Sci. Lett.

A strontium, neodymium and oxygen isotope study of hydrothermal metamorphism and crustal anatexis in the Trois Seigneurs Massif, Pyrenees, France

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Contrib. Mineral. Petrol.

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The difference between oceanic and continental tholeiites: a fluid dynamic explanation

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Doc. Bur. Rech. Géol. Min.

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Research paper
SrNd isotopic record of multi-stage interactions between mantle-derived magmas and crustal components in a collision context — The ultramafic-granitoid association from Vivero (Hercynian belt, NW Spain)

⁴⁰Ar/ ³⁹Ar dating of deformation fabrics in the relative autochthon in NW Spain