ANALYSIS OF THE GEOLOGICAL EVOLUTION AND VERTICAL MOVEMENTS IN THE VALENCIA TROUGH AREA, WESTERN MEDITERRANEAN

被引：53

作者：

ROCA, E

DESEGAULX, P

机构：

[1] Dept. Geologia Dinàmica, Gf. i Pal., Universitat de Barcelona

[2] Institut Français du Pétrole, 92506 Rueil-Malmaison Cedex

来源：

MARINE AND PETROLEUM GEOLOGY | 1992年 / 9卷 / 02期

关键词：

VALENCIA TROUGH; WESTERN MEDITERRANEAN; BASIN ANALYSIS; BASIN SUBSIDENCE;

D O I：

10.1016/0264-8172(92)90089-W

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Valencia Trough, located between the Iberian Peninsula and the Balearic Islands, corresponds to the south-west prolongation of the Provencal Basin. The analysis of recently released seismic lines shows that the present day tectonics of the Valencia Trough are the result of the coeval development of (1) a system of horsts and grabens in the north-west part of the basin during the Late Oligocene(?) - Early Miocene (Catalan-Valencian domain) and (2) a thrust and fold system which lasted up to the Middle Miocene and which was followed by extensional tectonics during the Late Miocene (Betic-Balearic domain). In an attempt to characterize the evolution of the Valencia Trough, subsidence curves have been calculated for 18 wells and three regional cross-sections distributed across the basin. Backstripping of these data shows two major stages of tectonic subsidence history: (1) a first stage, coeval with basin formation (30-15 My), characterized by a rapid and strong tectonic subsidence which attains its maximum values in the central basin areas and close to the Balearic Islands; and (2) a second stage (15-0 My) in which the tectonic subsidence decreases gradually. The amount of crustal thinning estimated from a comparison of the observed and modelled tectonic subsidence ranges between 1.5 (Iberian margin areas) and 4.5 (central and south-western basin areas). These values agree with the crustal thicknesses inferred from seismic refraction data and gravimetric modelling. Nevertheless, such a degree of thinning cannot be explained by the Neogene extensional structure. The presence of thick Mesozoic deposits suggests that the present crustal thinning is partly due to previous Mesozoic extension.

引用

页码：167 / &

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