Subduction initiation in the Scotia Sea region and opening of the Drake Passage: When and why?

Lagemaat, Suzanna van de; Swart, Merel L.A.; Vaes, Bram; Kosters, Martha E.; Boschman, Lydian M.; Burton‐Johnson, Alex; Bijl, Peter K.; Spakman, Wim; Hinsbergen, Douwe J.J. van

doi:10.1016/j.earscirev.2021.103551

Cited by 59 publications

(80 citation statements)

References 193 publications

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“…We recovered their stem ages (divergence from groups outside the focal areas) and, if applicable, crown ages (first divergence within the focal areas). We then assessed, under the two ages scenarios, whether these ages coincide with the following biogeographic events: the split between South America and Antarctica, 50 Ma (van de Lagemaat et al ., 2021 ); boreotropical conditions during the Palaeocene and Eocene (Wolfe, 1975 ); rapid north Andean uplift, 8–5 Ma (Pérez‐Escobar et al ., 2022 ); and the Panama isthmus biotic interchange, beginning 20 Ma (O'Dea et al ., 2016 ).…”

Section: Methodsmentioning

confidence: 99%

Biogeographic history of a large clade of ectomycorrhizal fungi, the Russulaceae, in the Neotropics and adjacent regions

et al. 2022

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The biogeography of neotropical fungi remains poorly understood. Here, we reconstruct the origins and diversification of neotropical lineages in one of the largest clades of ectomycorrhizal fungi in the globally widespread family Russulaceae.We inferred a supertree of 3285 operational taxonomic units, representing worldwide internal transcribed spacer sequences. We reconstructed biogeographic history and diversification and identified lineages in the Neotropics and adjacent Patagonia.The ectomycorrhizal Russulaceae have a tropical African origin. The oldest lineages in tropical South America, most with African sister groups, date to the mid-Eocene, possibly coinciding with a boreotropical migration corridor. There were several transatlantic dispersal events from Africa more recently. Andean and Central American lineages mostly have northtemperate origins and are associated with North Andean uplift and the general north-south biotic interchange across the Panama isthmus, respectively. Patagonian lineages have Australasian affinities. Diversification rates in tropical South America and other tropical areas are lower than in temperate areas.Neotropical Russulaceae have multiple biogeographic origins since the mid-Eocene involving dispersal and co-migration. Discontinuous distributions of host plants may explain low diversification rates of tropical lowland ectomycorrhizal fungi. Deeply diverging neotropical fungal lineages need to be better documented.

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Section: Methodsmentioning

confidence: 99%

Biogeographic history of a large clade of ectomycorrhizal fungi, the Russulaceae, in the Neotropics and adjacent regions

et al. 2022

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“…This correlation provided an independent basis for the subsequent, more detailed geological correlations and reconstructions that brought South Georgia into much the same position (e.g., Dalziel et al, 1975;Tanner 1982a). More recently Vérard et al, (2012); and Van de Lagemaat et al (2021) have incorporated similar reconstructions in their plate models. This palinspastic reconstruction of the South Georgia microcontinent adjacent to the Cape Horn escarpment requires some 1700 km of eastward translation relative to the South American continent to reach its present position.…”

Section: Figure 10 About Herementioning

confidence: 99%

South Georgia microcontinent: Displaced fragment of the southernmost Andes

Dalziel

Macdonald

Stone

et al. 2021

Earth-Science Reviews

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“…The eastern boundary of the Aluk Plate is the Shackleton Fracture Zone, separating it from the West Scotia Sea. Opening of the Scotia Sea oceanic basins was not related to plate motions of the paleo-Pacific realm (Van de Lagemaat et al, 2021) and the Shackleton Fracture Zone is thus the eastern boundary of our reconstruction. To the north of the Shackleton Fracture Zone, the Antarctic Plate, Chile Ridge, and Nazca Plate are subducting below South America.…”

Section: Plate Tectonic Settingmentioning

confidence: 75%

Reconciling the Cretaceous breakup and demise of the Phoenix Plate with East Gondwana orogenesis in New Zealand

Lagemaat¹,

Kamp²,

Boschman³

et al. 2022

Preprint

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Following hundreds of millions of years of subduction in all circum-Pacific margins, the Pacific Plate started to share a mid-ocean ridge connection with continental Antarctica during a Late Cretaceous south Pacific plate reorganization. This reorganization was associated with the cessation of subduction of the remnants of the Phoenix Plate along the Zealandia margin of East Gondwana, but estimates for the age of this cessation from global plate reconstructions (~86 Ma) are significantly younger than those based on overriding plate geological records (105-100 Ma). To find where this discrepancy comes from, we first evaluate whether incorporating the latest available marine magnetic anomaly interpretations change the plate kinematic estimate for the end of convergence. We then identify ways to reconcile the outcome of the reconstruction with geological records of subduction along the Gondwana margin of New Zealand and New Caledonia. We focus on the plate kinematic evolution of the Phoenix Plate from 150 Ma onward, from its original spreading relative to the Pacific Plate, through its break-up during emplacement of the Ontong Java Nui Large Igneous Province into four plates (Manihiki, Hikurangi, Chasca, and Aluk), through to the end of their subduction below East Gondwana, to today. Our updated reconstruction is in line with previous compilations in demonstrating that as much as 800-1100 km of convergence occurred between the Pacific Plate and Zealandia after 100 Ma, which was accommodated until 90-85 Ma. Even more convergence occurred at the New Zealand sector owing to spreading of the Hikurangi Plate relative to the Pacific Plate at the Osbourn Trough, with the most recent age constraints suggesting that spreading may have continued until 79 Ma. The end of subduction below most of East Gondwana coincides with a change in relative plate motion between the Pacific Plate and East Gondwana from westerly to northerly, of which the cause remains unknown. In addition, the arrival of the Hikurangi Plateau in the subduction zone occurred independent from, and did not likely cause, the change in Pacific Plate motion. Finally, our plate reconstruction suggests that the previously identified geochemical change in the New Zealand arc around 105-100 Ma that was considered evidence of subduction cessation, may have been caused by Aluk-Hikurangi ridge subduction instead. The final stages of convergence before subduction cessation must have been accommodated by subduction without or with less accretion. This is common in oceanic subduction zones but makes dating the cessation of subduction from geological records alone challenging.

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Subduction initiation in the Scotia Sea region and opening of the Drake Passage: When and why?

Cited by 59 publications

References 193 publications

Biogeographic history of a large clade of ectomycorrhizal fungi, the Russulaceae, in the Neotropics and adjacent regions

Biogeographic history of a large clade of ectomycorrhizal fungi, the Russulaceae, in the Neotropics and adjacent regions

South Georgia microcontinent: Displaced fragment of the southernmost Andes

Reconciling the Cretaceous breakup and demise of the Phoenix Plate with East Gondwana orogenesis in New Zealand

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