期刊
INTERNATIONAL JOURNAL OF EARTH SCIENCES
卷 103, 期 5, 页码 1433-1451出版社
SPRINGER
DOI: 10.1007/s00531-014-1034-5
关键词
Gil Marquez pluton; Sierra Norte Batholith; Southern Iberia; U-Pb geochronology; Variscan suture zone; Collisional magmatism
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
The origin of plutonic complexes that stitch suture zones developed during collision is not well understood. In southern Iberia, the Pulo du Lobo suture zone (PDLZ) is intruded by the syn- to postcollisional Gil Marquez pluton (GMP), thought to be part of the Sierra Norte Batholith. U-Pb (LA-ICPMS, zircon) data on various phases of the GMP yield from oldest to youngest: (1) a 354.4 +/- A 7.6 Ma unfoliated gabbro; (2) a 345.6 +/- A 2.5 Ma foliated intermediate phase; (3) a 346.5 +/- A 5.4 Ma unfoliated porphyritic granite; (4) a 335.1 +/- A 2.8 Ma unfoliated biotite granite. This sequence is consistent with cross-cutting relationships observed in the field. The range in ages is consistent with interpretations that the GMP is part of the composite (ca. 350-308 Ma) SNB. Inherited ages preserved in the GMP intermediate and felsic phases indicate that its magmas traversed through South Portuguese Zone and PDLZ crust during emplacement. The ca. 345 Ma emplacement of the late kinematic foliated intermediate phase constrains the age of late-stage strike slip deformation within the PDLZ, and the lack of a foliation in the older gabbro indicates that is was not proximal to a shear zone neither at the time of emplacement, nor during its subsequent history. The unfoliated porphyritic granite and unfoliated biotite granite cut the foliation of the intermediate phase indicating emplacement during the waning stages of collision, while the ca. 335 Ma biotite granite intrudes the Santa Ira Flysch, thereby providing a tight constraint for the latest stage of deformation in the PDLZ.
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