ORCID Profile
0000-0002-1599-7240
Current Organisations
University of Western Australia
,
Universitat de Barcelona
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Publisher: Society of Exploration Geophysicists
Date: 05-2018
Abstract: The emergence of the concept of a “mineral system” has changed the way regional-scale mineral prospectivity is assessed. Geographically widespread data sets and deep-penetrating geophysical methods are required to map the various components of the mineral system, which may encompass areas of perhaps thousands of square kilometers and extend to mantle depths. Key mineral system components that can be detected in this fashion include deep-penetrating faults and the suture zones between major geologic blocks, which are important controls on the movement of metal-carrying magmas and brines in a variety of mineral systems. Two case studies from mineralized terrains in Western Australia illustrate the use of deep-penetrating geophysical methods in mineral exploration. Magnetotelluric (MT) data from a 300-km-long traverse in the Archean Yilgarn Craton map numerous steeply dipping conductive zones, which coincide with linear anomalies in potential field data and are interpreted as deep-penetrating faults. Also, lateral changes in crustal and upper mantle resistivity structure suggest the juxtaposition of two, or perhaps three, different major crustal blocks with intervening suture zones. Teleseismic data from a 250-km-long traverse in the Proterozoic Capricorn Orogen provide information on deep crustal structure and composition. Interpretation in association with deep seismic reflection data allows previously unrecognized suture zones to be recognized in the deep crust and under thick cover. Passive seismic and MT methods represent a comparatively cost effective way to identify key mineral system indicators of regional prospectivity, even in the geologically complex terrains of Western Australia.
Publisher: Springer Science and Business Media LLC
Date: 25-01-2018
Publisher: Informa UK Limited
Date: 14-05-2023
Publisher: Oxford University Press (OUP)
Date: 23-10-2018
DOI: 10.1093/GJI/GGX459
Publisher: Wiley
Date: 05-2019
Publisher: European Association of Geoscientists & Engineers
Date: 2018
Publisher: American Geophysical Union (AGU)
Date: 23-03-2015
DOI: 10.1002/2015GL063042
Publisher: Elsevier BV
Date: 02-2023
Publisher: Springer Science and Business Media LLC
Date: 07-02-2014
Publisher: IATED
Date: 07-2023
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 05-2015
Publisher: American Geophysical Union (AGU)
Date: 12-2018
DOI: 10.1029/2018JB015795
Publisher: Elsevier BV
Date: 2021
Publisher: American Geophysical Union (AGU)
Date: 07-2023
DOI: 10.1029/2023SW003426
Abstract: The aim of this study is to evaluate the geomagnetically induced current (GIC) hazard in the power networks of the Canary and Balearic archipelagos. This is done in order to strictly complete the detailed assessment at national level of the power transmission system of mainland Spain, including the 400 and 220 kV levels. We have constructed models for the grids in each of the in idual systems and used resistivity models of the lithosphere for each group of islands, from which we have calculated the surface impedances. The respective models of electrical admittances of the grids have been combined with the geoelectric field derived from the convolution of the recorded (or expected in an extreme scenario) geomagnetic storms and the impedances calculated from the geoelectrical models to derive the expected GICs in the power lines, substations, and transformers. The low geomagnetic latitude of the Canary Islands combined with the small size of their power networks, makes them one of the least likely electrified locations to record significant GICs, with less than 3 A for the 100‐year return period. Even the 13 A that could be reached for the upper limit of the 95% confidence interval at the 500‐year return period does not seem likely to have a significant impact. The Balearic Islands, being at higher latitude and with a system length of approximately 300 km, including alternating current power lines connecting the Islands, shows GIC signals of moderate litude with up to 40 A for the 100‐year return period.
Location: Australia
No related grants have been discovered for Perla Piña-Varas.