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Crustal structure and magmatic system of Isla Socorro (Eastern Pacifc Ocean), derived from the interpretation of geological–geophysical data

Tapia Cesar, Yutsis Vsevolod, Varley Nick

Acta Geophysica

2021

Vol. 69, no. 6

2051--2067

Isla Socorro is an oceanic island located in the Eastern Pacific Ocean, at the junction of the Clarion Fracture Zone and Mathematician Ridge, approximately 600 km west of the Mexican coastline. Very little is known about the submarine portion of the island, but based on the oldest subaerial deposits, it is inferred to be primarily a basaltic shield cone. In this study, the subsurface structure of Isla Socorro was analysed based on an integration of geological and geophysical data. The geophysical data consist of high-resolution airborne magnetic data as well as an integration of terrestrial gravity and high-resolution satellite gravity. The study revealed important information about the composition, structure and origin of the volcanic edifice. The analysis and interpretation of the gravity and magnetic data indicate the existence of extensional systems associated to the principal tectonic structures of the Revillagigedo area. The horizontal gradient and Euler deconvolution of magnetic data reveal the presence of curved features interpreted as caldera structures. A central, vertically extensive body low in both density and magnetic susceptibility was identified through the 2D forward and 3D inverse modelling techniques. This body could represent a high-temperature zone above the Curie point, thus, we propose this body as a remnant magma reservoir and the source of the most recent volcanic activity from subaerial Socorro, and indicates that the possibility of a future large volume eruption from the summit cannot be ruled out.

O nowych rozwiązaniach tektonicznych w „Atlasie geologicznym Polski”

Aleksandrowski P., Mazur S.

Przegląd Geologiczny

2017

Vol. 65, nr 12

1499--1510

Authorial comprehensive comments and explanations are given to some of the interpretations applied in the tectonic part of the newly published Geological Atlas of Poland (Nawrocki, Becker, 2017) that considerably change the hitherto generally accepted concepts. It should be, however, admitted that most of those "new’" solutions were already proposed in the past by other workers as hypotheses that could not have been tested in the then state of knowledge on Poland’s deep geology and scientific tools at hand. This has now changed with abundant new data obtained with modern seismic techniques and advanced methods of potential field modelling. Using those data, we justify the reasons for, among others, a significant eastward shifting the front of the Variscan Orogen in Poland andfor the accompanying change in position of the division line between the Precambrian and Palaeozoic platforms. We also show the rationale for accepting a far-reaching southwestward extent of the East European Craton’s crystalline basement below the Palaeozoic Platform and for reinterpretation of the Teisseyre-Tornquist Zone’s nature, together with the question of early Palaeozoic terranes in the TESZ and the situation of the Caledonian foredeep at the SW margin of the East-European Craton.