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Open AccessArticle

Provenance of Heavy Minerals: A Case Study from the WNW Portuguese Continental Margin

Instituto D. Luiz and Departamento de Geologia, Faculdade de Ciências (Universidade de Lisboa), Edifício C6, Campo Grande, 1749-016 Lisboa, Portugal
Minerals 2019, 9(6), 355; https://doi.org/10.3390/min9060355
Received: 27 February 2019 / Revised: 6 June 2019 / Accepted: 10 June 2019 / Published: 12 June 2019
(This article belongs to the Special Issue Heavy Minerals: Methods & Case Histories)
This work describes and interprets the presence of heavy minerals in the WNW Portuguese continental margin using a set of 78 bottom samples collected from three distinct areas of this margin: the Porto, Aveiro, and Nazaré canyon head areas. The main transparent heavy mineral assemblage (mineral grains with frequencies ≥1% identified under a petrographic microscope) is composed of amphibole, andalusite, tourmaline, biotite, garnet, staurolite, pyroxene, zircon, and apatite. The felsic igneous and metamorphic rock outcrops in the main Northern Portuguese river basins and the relict sedimentary continental shelf deposits explained the presence of most of these mineral grains (both considered as distal sources). However, the presence of pargasite, augite, diopside-hedenbergite, enstatite-ferrosilite, and forsterite in the Porto and Aveiro areas (minerals identified by electronic microprobe analysis) is probably related to the presence of an igneous basic source next to dolomitic limestones affected by thermal metamorphism. These geological formations are considered as local sources. The high concentration of biotite observed in the Nazaré area is the result of the selective transport of the most lamellar sand particles of this mineral. View Full-Text
Keywords: mineral grains composition; surface textures; sources; WNW Portuguese Continental Margin mineral grains composition; surface textures; sources; WNW Portuguese Continental Margin
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MDPI and ACS Style

Cascalho, J. Provenance of Heavy Minerals: A Case Study from the WNW Portuguese Continental Margin. Minerals 2019, 9, 355.

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