NDLI: Subsurface mapping in the Iberian Pyrite Belt using seismic reflection profiling and potential-field data

Content Provider	Springer Nature Link
Author	Carvalho, João Inver, Carlos Matos, João Xavier Rosa, Carlos Granado, Isabel Branch, Tim Represas, Patrícia Carabaneanu, Livia Matias, Luís Sousa, Pedro
Copyright Year	2016
Abstract	The Iberian Pyrite Belt (IPB) hosts world-class massive sulphide deposits, such as Neves-Corvo in Portugal and Rio Tinto in Spain. In Portugal, the Palaeozoic Volcanic-Sedimentary Complex (VSC) hosts these ore deposits, extending from the Grândola-Alcácer region to the Spanish border with a NW–SE to WNW–ESE trend. In the study area, between the Neves-Corvo mine region and Alcoutim (close to the Spanish border), the VSC outcrops only in a small horst near Alcoutim. Sparse exploration drill-hole data indicate that the depth to the top of the VSC varies from several 100 m to about 1 km beneath the Mértola Formation Flysch cover. Mapping of the VSC to the SE of Neves-Corvo mine is an important exploration goal and motivated the acquisition of six 2D seismic reflection profiles with a total length of approximately 82 km in order to map the hidden extension of the VSC. The data, providing information deeper than 10 km at some locations, were integrated in a 3D software environment along with potential-field, geological and drill-hole data to form a 3D structural framework model. Seismic data show strong reflections that represent several long Variscan thrust planes that smoothly dip to the NNE. Outcropping and previously unknown Late Variscan near-vertical faults were also mapped. Our data strongly suggest that the structural framework of Neves-Corvo extends south-eastwards to Alcoutim. Furthermore, the VSC top is located at depths that show the existence within the IPB of new areas with good potential to develop exploration projects envisaging the discovery of massive sulphide deposits of the Neves-Corvo type.
Starting Page	899
Ending Page	915
Page Count	17
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	106
Issue Number	3
e-ISSN	14373262
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-06-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iberian Pyrite Belt Massive sulphide deposits Volcanic-Sedimentary Complex Seismic reflection Magnetic anomalies Bouguer anomalies Geology Geophysics/Geodesy Sedimentology Structural Geology Mineral Resources Geochemistry
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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