Relationship between northwestern Tasmania and East Gondwanaland in the Late Cambrian/Early Ordovician: paleomagnetic evidence

Article Abstract:

Paleomagnetic studies on lower Upper Cambrian turbiditic red siltstone and mudstone in the Rocky Cape block of northwestern Tasmania reveal a possible primary diagenetic remanence predating the late Middle Devonian deformation. The corresponding paleo-pole position compares well with the Late Cambrian to Early Ordovician pole positions from East Gondwanaland. This indicates that the separation of northwestern Tasmania from East Gondwanaland during the Neoproterozoic breakup of the supercontinent Rodinia was followed by its accretion to East Gondwanaland by at least the Early Ordovician.

Observations, Tasmania, Paleozoic Era, Paleomagnetism, Siltstone

---

Terranes or Cambrian polar wander: New data from the Scott Glacier area, Transantarctic Mountains, Antarctica

Article Abstract:

A field mapping and sampling programme in the Transantarctic Mountains of East Antarctica has been used to improve understanding of Antarctica's tectonic role during the last stages of Gondwana assembly in the Early Paleozoic. This research has obtained new paleomagnetic data from late Lower Cambrian and Middle Cambrian rocks representing the first Cambrian paleomagnetic results from the Transantarctic Mountains. There are a number of possible explanations for the discrepancy between the new Antarctic poles and the Gondwana Cambrian paleopoles.

Cambrian period, Antarctic regions

---

Late Gondwanide tectonic rotations within Gondwanaland

Article Abstract:

Paleomagnetic and geologic analysis of theSouth American Falkland Islands and the West Antarctic Ellsworth-Whitmore mountains shows that prior to seafloor spreading, Mesozoic Gondwanide folding occured before "Samfrau geosyncline" tectonic displacement. Analogous to collision in the Alpine-Himalayan belt, the results suggest that a fore-arc andmagmatic arc terrane collided with the Gondwana craton's Panthalassic margin asthe marginal basin closed, thus affecting the development of the South AtlanticWeddell Sea-Ross Sea region.

South Atlantic Ocean

Similar abstracts:

• Abstracts: Rheology predictions across the western Carpathians, Bohemian massif, and the Pannonian basin: Implications for tectonic scenarios
• Abstracts: Alternating contractional and extensional events in the Alpujarride nappes of the Alboran Domain (Betics, Gibraltar Arc)
• Abstracts: Tectonic history of the eastern edge of the Alexander Terrane, southeast Alaska. GPS-determination of along-strike variation in Cascadia margin kinematics: implications for relative plate motion, subduction zone coupling, and permanent deformation

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.