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Mesoproterozoic Tasmania: witness to the East Antarctica-Laurentia connection within Nuna
Citation
Mulder, JA and Halpin, JA and Daczko, NR, Mesoproterozoic Tasmania: witness to the East Antarctica-Laurentia connection within Nuna, Geology, 44, (3) pp. e383. ISSN 0091-7613 (2016) [Letter or Note in Journal]
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Abstract
Our detrital zircon U-Pb-Hf isotopic data and paleocurrent indicators
from the lower-middle Rocky Cape Group (RCG) of northwest
Tasmania, a >10-km-thick package of marine sedimentary rocks, are
consistent with a provenance including basement terranes in the
southern Mawson continent (East Antarctica) and southwest Laurentia,
supporting a SWEAT-like configuration for the supercontinent Nuna
between 1.45 and 1.3 Ga (Mulder et al., 2015). Moore and Betts
(2016) challenge our proposed paleogeographic position for Tasmania
within Nuna. Instead, they champion an alternative position for
Proterozoic Tasmania that they claim better fits elements of Tasmanian
geology outside of the RCG (Moore et al., 2015). From the outset,
we would like to reiterate that the data and paleogeographic reconstruction
presented us were discussed in the context of the Nuna
supercontinent and based on the most recent reconstruction by
Pisarevsky et al. (2014). We specifically addressed the interval 1.45–
1.3 Ga, which encompasses the period in which Nuna started to rift
and break apart. Nowhere do we address the reconstructed position of
VanDieland—a microcontinent that includes rocks as young as
Cambrian, and represents Tasmania (and central Victoria, South
Tasman Rise, and East Tasman Plateau) just prior to incorporation into
Gondwana (Cayley, 2011). Although most of the points raised by
Moore and Betts are not directly relevant to the dataset and reconstruction
in our paper, we welcome the opportunity to elaborate on our
ongoing research on the Proterozoic tectonics of Tasmania by
addressing the issues they have raised.
Item Details
| Item Type: | Letter or Note in Journal |
|---|---|
| Keywords: | Nuna, Rodina, Rocky Cape Group, zircon |
| Research Division: | Earth Sciences |
| Research Group: | Geology |
| Research Field: | Tectonics |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding Knowledge |
| Objective Field: | Expanding Knowledge in the Earth Sciences |
| Author: | Mulder, JA (Mr Jacob Mulder) |
| Author: | Halpin, JA (Dr Jacqueline Halpin) |
| ID Code: | 107119 |
| Year Published: | 2016 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2016-03-04 |
| Last Modified: | 2016-03-07 |
| Downloads: | 1 View Download Statistics |
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