Argoland

For a fictional country, see Limes inferior.
Indonesia
Gondwana 120Ma ago
Plate tectonic reconstruction at 100 Ma ago
Paleogeological context of Myanmar

Argoland is the tentative name of a hypothetical paleocontinent which was suggested to rift off from northwestern Australia some 155 Ma ago (Late Jurassic). The evidence for this was drawn from the existence of the Argo Abyssal Plain northwestwards off Australia.[1] An October 2023 article by Advokaat and van Hinsbergen attempted to reconstruct Argoland, where it is suggested that it was an archipelago rather than a solid continent and currently its Gondwana-derived fragments are southwest Borneo, Greater Paternoster, East Java, South Sulawesi, West Burma block, and Mount Victoria Land block.[a][3]

For some time the evolution of Argoland was unknown. Researchers expected to find a submerged continent under the islands of Southeastern Asia, but none were found.[4] There were a number of hypothesis, e.g., suggesting that its remains are East Java-West Sulawesi, or it evolved to West Burma.[5] However these suggestions seemed controversial, since these areas were surrounded by much older remnants, dating up to 205 Ma ago, which would poorly match the current theories of plate tectonics.[1][4]

Advokaat and van Hinsbergen concluded that the fragmentation of Argoland started around 215Ma ago, long before it split off Australia and it always consisted of separate microcontinental fragments.[4] Advokaat and van Hinsbergen reconstruct that "Argoland originated at the northern Australian margin between the Bird's Head in the east and Wallaby-Zenith fracture zone in the west, south of which it bordered Greater India" and it broke into what they call "Argopelago" during Late Triassic rifting of Lhasa terrane from the Gondwana margin.[b][3]

Notes

  1. ^ Mount Victoria Land block rifted from Gondwana and collided with Burma[2]
  2. ^ At these times (the precursors of) Australia, Lhasa, and India were close by.

References

  1. ^ a b Aristos Georgiou (October 23, 2023). "Lost Continent Argoland Discovered Hidden Beneath Jungles". Newsweek. Retrieved November 20, 2023.
  2. ^ A. H. G. Mitchell (1989). "The Shan Plateau And Western Burma: Mesozoic-Cenozoic Plate Boundaries and Correlations with Tibet". Tectonic Evolution of the Tethyan Region, NATO ASI Series. 259. Springer, Dordrecht: 567–583. doi:10.1007/978-94-009-2253-2_24. ISBN 978-94-010-7509-1.{{cite journal}}: CS1 maint: periodical has ISBN (link)
  3. ^ a b Eldert L. Advokaat and Douwe J.J. van Hinsbergen (October 19, 2023). "Finding Argoland: Reconstructing a microcontinental archipelago from the SE Asian accretionary orogen". Gondwana Research. 128: 161–263. doi:10.1016/j.gr.2023.10.005. ISSN 1342-937X.
  4. ^ a b c Eldert Advokaat and Stephan van Meulebrouck (2023-10-23). "Finding Argoland: how a lost continent resurfaced – Geological puzzle solved after seven years of research". Utrecht University. Retrieved 2023-11-20.
  5. ^ Xiaoran Zhang; Sun-Lin Chung; Jui-Ting Tang; Adi Maulana; Musri Mawaleda; Thura Oo; Chia-Yu Tien; Hao-Yang Lee (December 3, 2020). "Tracing Argoland in eastern Tethys and implications for India-Asia convergence". GSA Bulletin. 133 (7–8): 1712–1722. doi:10.1130/B35772.1.

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