Reconstructing subduction polarity through the geochemistry of mafic rocks in a Cambrian magmatic arc along the Gondwana margin (Órdenes Complex, NW Iberian Massif)
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- 作者：P. Andonaegui ; S. Sánchez-Martínez…
- 关键词：Peri ; Gondwanan Cambrian arc ; Subduction polarity ; Gabbronorites ; Sr and Sm–Nd isotopic geochemistry ; Órdenes Complex ; NW Iberia
- 刊名：International Journal of Earth Sciences
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：105
- 期：3
- 页码：713-725
- 全文大小：1,760 KB
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S. Sánchez-Martínez (1) (2)
P. Castiñeiras (1)
J. Abati (1) (2)
R. Arenas (1) (2)
1. Dpto. Petrología y Geoquímica (UCM), Universidad Complutense de Madrid, 28040, Madrid, Spain
2. Instituto de Geociencias (UCM, IGEO), Universidad Complutense de Madrid, 28040, Madrid, Spain - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geology
Geophysics and Geodesy - 出版者：Springer Berlin / Heidelberg
- ISSN：1437-3262
文摘
In the allochthonous complexes of the NW Iberian Massif, the Upper Units have been interpreted as a section of a peri-Gondwanan magmatic arc active from Middle Cambrian to Early Ordovician times. The main plutonic bodies intruding the arc metasediments are the Monte Castelo gabbronorites and the Corredoiras orthogneisses, which include minor metagabbronorite bodies, both dated at ca 500 Ma. The geochemical features of Monte Castelo metagabbronorites indicate a tholeiitic affinity, with negative Nb anomaly; its 143Nd/144Nd ratios are high (0.5143119–0.513019), whereas initial 87Sr/86Sr ratios are low (0.702562–0.703174), with positive εNdi values (+7.8 to +5.4). The geochemistry of Corredoiras metagabbronorites indicates a calc-alkaline affinity, also with negative Nb anomaly, low 143Nd/144Nd (0.512575–0.512436) and high initial 87Sr/86Sr (0.705082–0.706684), εNdi values ranging between −0.65 and +1.83. In the εNd versus age diagram, Monte Castelo samples show compositions equivalent to the contemporaneous depleted mantle. Corredoiras metagabbros have much lower εNdi values compared with Monte Castelo samples, with older model ages ranging between 1165 and 1291 Ma, suggesting contamination of the original mafic mantle-derived magmas with an older continental crust. These geochemical features can be linked to the setting of a mature volcanic arc, in which Monte Castelo metagabbros were located close to the trench, while Corredoiras metagabbros would be in a relatively distant position from the trench, thus indicating subduction polarity.