ORCID Profile
0000-0003-2776-3246
Current Organisation
University of Lausanne
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Publisher: Elsevier BV
Date: 09-2019
Publisher: Springer Science and Business Media LLC
Date: 02-2016
Publisher: American Geophysical Union (AGU)
Date: 03-2022
DOI: 10.1029/2021GC010042
Abstract: Tectonic interpretations of arc remnants in the Himalayan orogen remain uncertain, despite their important implications for the overall convergence history between India and Eurasia. Provenance results from deep‐water volcaniclastic rocks of the Indus Suture Zone in Ladakh provide new constraints on the Mesozoic tectonic evolution of the Dras and Kohistan‐Ladakh arcs. Detrital zircon (DZ) U‐Pb ages and whole‐rock geochemistry of the fault‐bounded Upper Cretaceous Nindam and Paleocene Jurutze formations present age patterns and compositions that are consistent with those of the Dras and Kohistan‐Ladakh arcs, respectively. The combination of DZs of the Nindam and Jurutze formations with the igneous zircons of the Dras and Kohistan‐Ladakh arcs shows similar age distributions that support a Late Jurassic to Paleocene tectonic connection between all these units. We argue that the secular trends in geochemical composition of DZs and volcaniclastic material are consistent with the magmatic evolution of one convergent margin, which shifted from a primitive to a mature stage during the Late Cretaceous. The recognition of a single Dras‐Kohistan‐Ladakh arc sets the stage for reevaluating competing scenarios of the Mesozoic evolution of the India–Eurasia convergent system. We find that the most likely scenario is that of a Jurassic arc formed above a south‐dipping intraoceanic subduction zone and accreted to Eurasia during the Early Cretaceous, after which it evolved above a north‐dipping subduction zone.
Publisher: Wiley
Date: 23-03-2018
DOI: 10.1111/BRE.12284
Publisher: California Digital Library (CDL)
Date: 09-09-2023
DOI: 10.31223/X5K962
Publisher: Wiley
Date: 12-03-2018
DOI: 10.1002/DEP2.40
Publisher: American Geophysical Union (AGU)
Date: 12-2019
DOI: 10.1029/2019TC005741
Publisher: Geological Society of America
Date: 20-03-2019
DOI: 10.1130/B35037.1
Abstract: The Cretaceous period was marked by the most voluminous episodes of oceanic plateau volcanism in the Phanerozoic Eon. Primarily affecting the Pacific, mantle plumes generated oceanic plateaus during three main phases (ca. 145–140 Ma, ca. 122–115 Ma, and ca. 100–90 Ma). Central America is one of the very few circum-Pacific margins where remnants of these Cretaceous plateaus were accreted. The study of their onland exposures provides a highly valuable insight into the complexity and ersity of oceanic plateau histories, from their eruption to their accretion. Exposed in northern Costa Rica, the plateau remnants of the Nicoya Peninsula originated from a Jurassic oceanic crust over-thickened by Early and Late Cretaceous hotspots. These sheared-off pieces of the Farallon Plate testify to the early tectonic interaction of the Caribbean Large Igneous Province (CLIP, ca. 94–89 Ma) with North America, initiated m.y. after the onset of CLIP eruption. By combining our results with previously published data, we propose an updated tectono-stratigraphic framework that ides the Nicoya Peninsula into two oceanic plateau terranes. (1) The accretion timing of the Aptian to Turonian Manzanillo Terrane is constrained by the Coniacian (ca. 89–86 Ma) base of the overlapping Loma Chumico Formation. The proximal tuffaceous forearc deposits of the Loma Chumico Formation are the oldest evidence of a volcanic arc in Costa Rica—called here the Berrugate Arc—as revealed by new biostratigraphic and geochemical data. (2) The Nicoya Complex s. str. is a composite plateau remnant containing rocks of Bajocian to earliest C anian age. Its accretion occurred during the middle C anian (ca. 79–76 Ma) and shut down the Berrugate Arc. In contrast to the collision of CLIP with North America, onset of the collision of CLIP with South America began much later, during the latest C anian (ca. 75–73 Ma).
Publisher: Springer Science and Business Media LLC
Date: 12-05-2022
DOI: 10.1038/S43247-022-00446-1
Abstract: Oceanic mafic volcanic rocks preserve unique information regarding the nature and evolution of tectonic plates. However, constraining their age is commonly challenging because of their lack of datable minerals and high degrees of alteration. We present in situ laser ablation–inductively coupled plasma–mass spectrometry U-Pb dating of calcite phases in altered basalts in a Paleozoic subduction complex (eastern Australia). Calcite enclosed in amygdules and filled in fractures yielded two distinctive ages with contrasting geochemical signatures. These results, combined with new biostratigraphic and whole-rock geochemical data, suggest that oceanic islands formed in the Panthalassa Ocean at about 365 million years ago, accreted to eastern Gondwana at about 330 million years ago, and underwent brittle deformation at about 305 million years ago. Calcite U-Pb geochronology is valuable to help constrain minimum formation ages of volcanic rocks and their deformation history, ultimately improving ability to unravel the geological record of accretionary complexes, and more generally ancient underwater volcanic systems.
Publisher: American Geophysical Union (AGU)
Date: 12-2021
DOI: 10.1029/2021TC006920
Abstract: Cambrian to Triassic subduction processes in eastern Australia produced a complex and highly contorted assembly of supra‐subduction units. However, regardless of the long history of oceanic subduction, relatively little evidence exists on oceanic terranes whose accretion onto the continental margin may have accompanied subduction processes. We present new radiolarian and petrochronological data from Devonian and Carboniferous rocks exposed in the middle of a tight orocline. Based on radiolarian biostratigraphy and U‐Pb dating of detrital zircon grains, we show that volcaniclastic rocks from the Silverwood Group and Alice Creek beds were deposited during the Late Devonian, which is later than previously thought. Trace‐element compositions of the Devonian zircons are characteristic of crystallization of magmas in an oceanic environment, thus supporting previous suggestions that the Silverwood Group was derived from an intra‐oceanic arc system. Carboniferous zircons from a nearby forearc basin unit (Mount Barney beds) exhibit a continental affinity, indicating that accretion of the Silverwood Block likely occurred before the establishment of this continental arc. A serpentinite belt that occurs adjacent to the Silverwood Block might represent a remnant ophiolitic suture of the now‐consumed oceanic domain, which once separated the Silverwood Block from the eastern Gondwanan margin. Based on the assumption that such an intervening ocean existed, we discuss alternative scenarios for the origin and accretion of the Silverwood Block. The most likely scenario involves intra‐oceanic magmatism in a marginal oceanic basin whose development was driven by trench retreat, and a subsequent accretion in response to trench advance and/or slab flattening.
Start Date: 2018
End Date: 2019
Funder: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
View Funded ActivityStart Date: 2020
End Date: 2022
Funder: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
View Funded ActivityStart Date: 2019
End Date: 2020
Funder: University of Queensland
View Funded Activity