Tectonophysics2022，Vol.83418.DOI:10.1016/j.tecto.2022.229389

Deformation along the Deseado Massif (Patagonia, Argentina) during the Jurassic Period and its relationship with the Gondwana breakup: paleomagnetic and geochronological constraints

Ruiz Gonzalez, V Renda, E. M. Vizan, H. Ganerod, M. Puigdomenech, C. G. Zaffarana, C. B.
Tectonophysics2022，Vol.83418.DOI:10.1016/j.tecto.2022.229389
✕
  • NSTL
  • Elsevier

Deformation along the Deseado Massif (Patagonia, Argentina) during the Jurassic Period and its relationship with the Gondwana breakup: paleomagnetic and geochronological constraints

Ruiz Gonzalez, V 1Renda, E. M. 2Vizan, H. 1Ganerod, M. 3Puigdomenech, C. G. 1Zaffarana, C. B.2
扫码查看

作者信息

  • 1. CONICET UBA
  • 2. CONICET UNRN
  • 3. Geol Survey Norway
  • 折叠

Abstract

This work presents the analysis of paleomagnetic results obtained from four sampling areas of the Jurassic Bahia Laura Complex in the Deseado Massif and their implications on the regional deformation history during the breakup of Gondwana. Paleomagnetic data show cessation of tectonic block rotations about vertical axes around 160 Ma and a change from a transtensional to a mainly extensional tectonic regime. Two biotite samples yielded Ar-40-Ar-39 radiometric ages: one from the eastern outcrops of the Chon Aike Formation (plateau age of 184.66 +/- 0.55 Ma) and the other from the La Matilde Formation (plateau age of 157.40 +/- 0.65 Ma), located at the central part of the Deseado Massif. Finally, an apparent polar wander path (APWP) was calculated for the Jurassic of South America (200 to 140 Ma). This APWP indicates that South America experienced a northward drift between 200 Ma and 170 Ma, a clockwise rotation (similar to 10 degrees) between 170 Ma and 160 Ma, and a westward drift between 160 Ma and 140 Ma. The 170-160 Ma rotation could has been triggered by the combined effects of the uncoupling of the Antarctic Peninsula, the high rates of subduction of the Phoenix plate beneath Patagonia, the opening of the Rocas Verdes basin and the Weddell Sea, and the cessation of the Tethys slab-pull. Furthermore, the calculated APWP for South America does not support a Jurassic massive true polar wander event.

Key words

Jurassic/Deseado Massif/Patagonia/Gondwana/Paleomagnetism/Ar-40-Ar-39 dating/SANTA-CRUZ PROVINCE/CHON-AIKE FORMATION/SEA RIFT SYSTEM/SOUTH-ATLANTIC/POLAR WANDER/ANTARCTIC PENINSULA/IGNEOUS ROCKS/MAGMATISM/BASIN/GASTRE

引用本文复制引用

出版年

2022
Tectonophysics

Tectonophysics

EISCI
ISSN：0040-1951
被引量2
参考文献量181
段落导航相关论文