Apparent polar polar wander path for Adria extended by new Jurassic paleomagnetic results from its stable core: Tectonic implications

被引:13
作者
Marton, Emo [1 ]
Zampieri, Dario [2 ]
Cosovic, Vlasta [3 ]
Moro, Alan [3 ]
Drobne, Katica [4 ]
机构
[1] Geol & Geophys Inst Hungary, Palaeomagnet Lab, Columbus 17-23, H-1145 Budapest, Hungary
[2] Univ Padua, Dept Geosci, Via Gradenigo 6, I-35131 Padua, Italy
[3] Univ Zagreb, Fac Sci, Dept Geol, Horvatovac 102a, Zagreb 10000, Croatia
[4] ZRC SAZU, Ivan Rakovec Inst Paleontol, Novi Trg 2, SI-1000 Ljubljana, Slovenia
基金
匈牙利科学研究基金会;
关键词
Stable Adria; 167-41 Ma apparent polar wander; Tectonic implications; TRANSDANUBIAN CENTRAL MOUNTAINS; SOUTHERN ALPS; NORTHERN APENNINES; ALPINE EVOLUTION; PANNONIAN BASIN; TRENTO PLATEAU; MONTI-LESSINI; LIMESTONES; CONSTRAINTS; ROTATION;
D O I
10.1016/j.tecto.2017.02.004
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
As a continuation of a systematic paleomagnetic research in the northern part of stable Adria, which provided a well-defined apparent polar wander (APW) path for the Cretaceous-Eocene, we present new paleomagnetic results for the Jurassic. These new data were obtained from 15 geographically distributed localities from the Trento platform (eastern Southern Alps) using standard paleomagnetic approach. The Lower Jurassic shallow water carbonates are not considered for tectonic interpretation, due to inconsistent inclinations. The Middle and Upper Jurassic Rosso Ammonitico provided excellent kinematic constraints. With the new Jurassic results, an APW is now defined for Adria for the 167-40 Ma interval. It is well constrained for timing of important changes, like the speed and the sense of rotations. This APW suggests that the CW rotation and southward shift changed to the opposite at 155.1 +/- 5.3 Ma, signifying a dramatic change in the life of the Neo-Tethys, from opening to closing. The latter is manifested in fast CCW rotation and northward movement of Adria up to 102.9 +/- 2.4 Ma and moderate displacements in the same manner in post-103 Ma times. Combined data sets from stable Istria and the foreland of the Southern Alps point to an approximately 15 ON rotation with respect to Africa at the end of the Cretaceous, and an about 25 in the CCW sense, after the Eocene. (C) 2017 Elsevier B.V. All rights reserved.
引用
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页码:1 / 18
页数:18
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