Finding Argoland: Reconstructing a microcontinental archipelago from the SE Asian accretionary orogen

Advokaat, Eldert L.; van Hinsbergen, Douwe J.J.

doi:10.1016/j.gr.2023.10.005

Cited by 9 publications

(4 citation statements)

References 739 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The new model starts in Jurassic-early Cretaceous times with plate divergence north and south of Australia, which forms part of a single plate together with Greater India, and further west between west Gondwana, bearing Africa, and east Gondwana, bearing India and Antarctica. The divergence north of Australia and Greater India excises a continental sliver referred to as Argoland (Gibbons et al, 2012) whose remnants are preserved today in the eastern Tethyan collision zone of southeast Asia (Advokaat and van Hinsbergen, 2024). The model is not intended to show the detailed post-rifting histories of the various parts of Argoland.…”

Section: Results: a New Plate Kinematic Modelmentioning

confidence: 99%

Overture for the Mandara and Vasuki Plates

Eagles

2024

tekt

View full text Add to dashboard Cite

Models of past plate motions in the Indian Ocean help map the supercontinent Gondwana and investigate how mantle plumes influence plate tectonics. Reducing confidence in this, however, the range of available models all produce large pre-94 Ma movements, in various kinematic senses, between India and Madagascar. There is no observational evidence for any of these motions, suggesting along with their diversity that they are artefacts stemming from contrasting resolutions of techniques used for reconstructing India and Madagascar to Antarctica. A higher resolution approach to India–Antarctica reconstruction concentrates on geophysical records of relative plate motion azimuths. Applying its results regionally eliminates Indo-Malagasy motions before 94 Ma, and prompts new hypotheses of two small tectonic plates. The early Cretaceous Mandara plate, in the Enderby Basin off East Antarctica, may have initiated and rotated at a mid-ocean ridge that was supplied by excess melt from the Kerguelen plume. The late Cretaceous Vasuki plate may have conveyed Sri Lanka southwards across the western Bay of Bengal. The 85°E and Comorin ridges may have formed at active transform fault zones along Vasuki’s margins that were supplied with excess melt from the Crozet and Marion plumes. The model confidently implies the presence of 500,000 km2 of continental crust beneath the Kerguelen Plateau, places Sri Lanka 1000 km further east within Gondwana than previous reconstructions, and casts doubt on the existence of plate kinematic signals that have previously been attributed to the arrival and spread of the Marion plume beneath India and Madagascar at ~105 Ma.

show abstract

Section: Results: a New Plate Kinematic Modelmentioning

confidence: 99%

Overture for the Mandara and Vasuki Plates

Eagles

2024

tekt

View full text Add to dashboard Cite

show abstract

“…Multiple examples of HP and UHP metamorphism are recorded across much of SE Asia during the Early to Late Cretaceous, but their timing and tectonic significance is poorly constrained. This metamorphism broadly overlaps with multiple terrane accretion events from the region (e.g., Woyla, Southwest Borneo, and Argoland blocks Hall, 2012, Morley, 2012, Metcalfe, 2021, Advokaat and van Hinsbergen, 2024, van de Lagemaat and van Hinsbergen, 2024, as well as a previously recognised plate network reorganization at ~110-100 Ma (Matthews et al, 2012. Detailed petrochronology studies of these occurrences of HP/UHP metamorphism are yet to be conducted but may provide important constraints for plate reconstructions and orogenic models of SE Asia which continue to be debated and revised (e.g., Hall, 2012, Morley, 2012, Metcalfe, 2021, Advokaat and van Hinsbergen, 2024, van de Lagemaat and van Hinsbergen, 2024.…”

Section: The Geodynamic Significance Of Uhp Exhumation For Orogenesis...mentioning

confidence: 88%

The geodynamic significance of UHP exhumation: New constraints from Tso Morari Complex, NW Himalaya

Bidgood,

Parsons,

Roberts

et al. 2024

Preprint

View full text Add to dashboard Cite

The burial and exhumation of continental crust to and from ultrahigh-pressure (UHP) is an important orogenic process, often interpreted with respect to the onset and/or subduction dynamics of continent-continent collision. Here, we investigate the timing and significance of UHP metamorphism and exhumation of the Tso Morari complex, North-West Himalaya. We present new petrochronological analyses of mafic eclogites and their host-rock gneisses, combining U-Pb zircon, rutile and xenotime geochronology (high-precision CA-ID-TIMS and high-spatial resolution LA-ICP-MS), garnet element maps, and petrographic observations. Zircon from mafic eclogite have a CA-ID-TIMS age of 46.91 ± 0.07 Ma, with REE profiles indicative of growth at eclogite facies conditions. Those ages overlap with zircon rim ages (48.9 ± 1.2 Ma, LA-ICP-MS) and xenotime ages (47.4 ± 1.4 Ma; LA-ICP-MS) from the hosting Puga gneiss, which grew during breakdown of UHP garnet rims. We argue that peak zircon growth at 47-46 Ma corresponds to the onset of exhumation from UHP conditions. Subsequent exhumation through the rutile closure temperature, is constrained by new dates of 40.4 ± 1.7 and 36.3 ± 3.8 Ma (LA-ICP-MS). Overlapping ages from Kaghan imply a coeval time-frame for the onset of UHP exhumation across the NW Himalaya. Furthermore, our regional synthesis demonstrates a causative link between changes in the subduction dynamics of the India-Asia collision zone at 47-46 Ma and the resulting mid-Eocene plate network reorganization. The onset of UHP exhumation therefore provides a tightly constrained time-stamp significant geodynamic shifts within the orogen and wider plate network.

show abstract

“…Multiple examples of HP and UHP metamorphism are recorded across much of SE Asia during the Early to Late Cretaceous, but their timing and tectonic significance is poorly constrained. This metamorphism broadly overlaps with multiple terrane accretion events from the region (e.g., Woyla, Southwest Borneo, and Argoland blocks Advokaat & van Hinsbergen, 2024;Hall, 2012;Metcalfe, 2021;Morley, 2012;van de Lagemaat & van Hinsbergen, 2024), as well as a previously recognized plate network reorganization at ∼110-100 Ma (Matthews et al, 2012;Müller et al, 2016). Detailed petrochronology studies of these occurrences of HP/UHP metamorphism are yet to be conducted but may provide important constraints for plate reconstructions and orogenic models of SE Asia which continue to be debated and revised (e.g., Advokaat & van Hinsbergen, 2024;Hall, 2012;Metcalfe, 2021;Morley, 2012;van de Lagemaat & van Hinsbergen, 2024).…”

Section: The Geodynamic Significance Of Uhp Exhumation For Orogenesis...mentioning

confidence: 89%

The Geodynamic Significance of Continental UHP Exhumation: New Constraints From the Tso Morari Complex, NW Himalaya

Bidgood,

Parsons,

Roberts

et al. 2024

Tectonics

View full text Add to dashboard Cite

The burial and exhumation of continental crust to and from ultrahigh‐pressure (UHP) is an important orogenic process, often interpreted with respect to the onset and/or subduction dynamics of continent‐continent collision. Here, we investigate the timing and significance of UHP metamorphism and exhumation of the Tso Morari complex, North‐West Himalaya. We present new petrochronological analyses of mafic eclogites and their host‐rock gneisses, combining U‐Pb zircon, rutile and xenotime geochronology (high‐precision CA‐ID‐TIMS and high‐spatial resolution LA‐ICP‐MS), garnet element maps, and petrographic observations. Zircon from mafic eclogite have a CA‐ID‐TIMS age of 46.91 ± 0.07 Ma, with REE profiles indicative of growth at eclogite facies conditions. Those ages overlap with zircon rim ages (48.9 ± 1.2 Ma, LA‐ICP‐MS) and xenotime ages (47.4 ± 1.4 Ma; LA‐ICP‐MS) from the hosting Puga gneiss, which grew during breakdown of UHP garnet rims. We argue that peak zircon growth at 47–46 Ma corresponds to the onset of exhumation from UHP conditions. Subsequent exhumation through the rutile closure temperature, is constrained by new dates of 40.4 ± 1.7 and 36.3 ± 3.8 Ma (LA‐ICP‐MS). Overlapping ages from Kaghan imply a coeval time‐frame for the onset of UHP exhumation across the NW Himalaya. Furthermore, our regional synthesis demonstrates a causative link between changes in the subduction dynamics of the India‐Asia collision zone at 47–46 Ma and the resulting mid‐Eocene plate network reorganization. The onset of UHP exhumation therefore provides a tightly constrained time‐stamp significant geodynamic shifts within the orogen and wider plate network.

show abstract

Finding Argoland: Reconstructing a microcontinental archipelago from the SE Asian accretionary orogen

Cited by 9 publications

References 739 publications

Overture for the Mandara and Vasuki Plates

Overture for the Mandara and Vasuki Plates

The geodynamic significance of UHP exhumation: New constraints from Tso Morari Complex, NW Himalaya

The Geodynamic Significance of Continental UHP Exhumation: New Constraints From the Tso Morari Complex, NW Himalaya

Contact Info

Product

Resources

About