A. Alexander G. Webb
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View article: Spontaneous Transient Summit Uplift at Taftan Volcano (Makran Subduction Arc) Imaged Using an InSAR Common‐Mode Filtering Method
Spontaneous Transient Summit Uplift at Taftan Volcano (Makran Subduction Arc) Imaged Using an InSAR Common‐Mode Filtering Method Open
We unambiguously document unrest at Taftan volcano. Summit uplift was detected using Interferometric Synthetic Aperture Radar time series and its timing tightly constrained applying a new common mode filtering method. Uplift started and en…
View article: Apatite (U‐Th)/He Thermochronometry Along the Sutlej River, NW India Himalaya: Pleistocene River Capture Events Accelerated River Anticline Development
Apatite (U‐Th)/He Thermochronometry Along the Sutlej River, NW India Himalaya: Pleistocene River Capture Events Accelerated River Anticline Development Open
River capture events may create short‐term pulses of incision in orogenic settings, complicating the interpretation of tectonic and climatic influences on exhumation patterns. The Sutlej River in northwestern India offers a compelling case…
View article: Evolution of lithospheric thickness in Early Earth: Insights into tectonic regimes
Evolution of lithospheric thickness in Early Earth: Insights into tectonic regimes Open
Understanding lithospheric thickness during the Early Earth is crucial for unraveling tectonic modes (e.g., heat-pipe vs. stagnant-lid) and cooling mechanisms. The heat-pipe model likely produced a thick lithosphere early on, which thinned…
View article: Spontaneous transient summit uplift at Taftan volcano (Makran subduction arc) imaged using an InSAR common-mode filtering method
Spontaneous transient summit uplift at Taftan volcano (Makran subduction arc) imaged using an InSAR common-mode filtering method Open
We unambiguously document unrest at Taftan volcano. Summit uplift was detected using InSAR time series and its timing tightly constrained applying a new common mode filtering method. Uplift started and ended gradually lasting 10 months (Ju…
View article: Mid-crustal overpressure in the Tethyan Himalaya
Mid-crustal overpressure in the Tethyan Himalaya Open
Theory suggests the possibility for significant deviations between total pressure (or dynamic pressure) and lithostatic pressure during crustal metamorphism. If such deviations exist, the implications for orogenic reconstruction would be p…
View article: The VolcaMotion project: Integrating Geophysical, Geological, and Geochronological Data to understand Flank Instability of Macaronesian Volcanoes
The VolcaMotion project: Integrating Geophysical, Geological, and Geochronological Data to understand Flank Instability of Macaronesian Volcanoes Open
Volcanic flank instability poses a significant geohazard, particularly in oceanic island settings. Since September 2023, the VolcaMotion project has been investigating the mechanisms and timing of volcano flank instability across the Macar…
View article: CO2 emissions due to melt-carbonate interactions triggered the Miocene Climatic Optimum
CO2 emissions due to melt-carbonate interactions triggered the Miocene Climatic Optimum Open
The Miocene Climatic Optimum (ca. 17−14 Ma) is an enigmatic climatic reversal that interrupted the long-term cooling trending of the Cenozoic. The forcing for this warming event remains unclear. Here we present direct evidence of melt−carb…
View article: Rapid heating (<2 Ma) to ultrahigh-temperature metamorphism via asthenospheric upwelling
Rapid heating (<2 Ma) to ultrahigh-temperature metamorphism via asthenospheric upwelling Open
Ultrahigh-temperature (UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism, with temperatures exceeding 900°C. The duration and heat source of UHT metamorphism are critical constraints on the tectonic evol…
View article: Primordial monazite growth in Archean &#8220;metapelites&#8221; of the Isua supracrustal belt, southern West Greenland
Primordial monazite growth in Archean “metapelites” of the Isua supracrustal belt, southern West Greenland Open
We are exploring the origins of some of Earth’s oldest monazite minerals found in the Isua supracrustal belt of southern West Greenland. Monazite is the primary host for light rare earth elements, Th and U, and is a predominant acces…
View article: Unravelling the metamorphic history of the Isua supracrustal belt: A garnet-based study in West Greenland
Unravelling the metamorphic history of the Isua supracrustal belt: A garnet-based study in West Greenland Open
The Eoarchean Isua supracrustal belt (ISB) in West Greenland comprises one of the oldest rock records, yet its geological evolution and geodynamic setting are still debated. Major order questions involve the timing and number of the tecton…
View article: Amphibolite facies conditions recorded in CO2-bearing fluid-mediated reaction fronts preserved in an ultramafic lens from the Isua supracrustal belt, southern West Greenland
Amphibolite facies conditions recorded in CO2-bearing fluid-mediated reaction fronts preserved in an ultramafic lens from the Isua supracrustal belt, southern West Greenland Open
The Eoarchean Isua supracrustal belt (ISB) in southern West Greenland exposes one of the oldest rock records on Earth. Its tectono-metamorphic evolution remains debated, particularly with respect to its timing and metamorphic peak conditio…
View article: A decade of the heat-pipe Earth hypothesis
A decade of the heat-pipe Earth hypothesis Open
In his classic contribution “A Heat Pipe Mechanism for Volcanism and Tectonics on Venus” [1989, JGR 94, B3, 2779-2785], Turcotte applied O’Reilly and Davies’ [1981, GRL 8, 313-316] model for Io’s volcanic heat…
View article: Clusters of Late Noachian- Early Hesperian large volcanic constructs across Arabia Terra and Xanthe Terra on Mars
Clusters of Late Noachian- Early Hesperian large volcanic constructs across Arabia Terra and Xanthe Terra on Mars Open
Populations of underrecognized Noachian or Early Hesperian volcanic structure associated with both explosive and effusive volcanism are present within Arabia Terra, Xanthe Terra and perhaps throughout the ancient highlands on Mars. Here we…
View article: Unraveling rapid exhumation: Insights into the increase of exhumation rates in the Sutlej River anticline (NW Indian Himalaya) over the last 200 kyr.
Unraveling rapid exhumation: Insights into the increase of exhumation rates in the Sutlej River anticline (NW Indian Himalaya) over the last 200 kyr. Open
Estimating exhumation rates on Pleistocene-Holocene time scales presents a challenge due to the scarcity of suitable low-temperature thermochronometers. Apatite helium (AHe) dating is unable to precisely differentiate cooling ages
View article: Mapping the Tesserae Highlands of Venus &#8211; Insights into Tectonic Deformation and Plateau Genesis
Mapping the Tesserae Highlands of Venus – Insights into Tectonic Deformation and Plateau Genesis Open
Tesserae terrains on Venus are characterized by intersecting sets of tectonic fabrics, signifying pervasive, complex, and multi-stage deformation. The locally stratigraphically oldest tesserae units, which cover around 8% of Venus’s …
View article: Litho-structural framework of the Eoarchean Tussaap supracrustal belt, Itsaq gneiss complex, southwestern Greenland
Litho-structural framework of the Eoarchean Tussaap supracrustal belt, Itsaq gneiss complex, southwestern Greenland Open
The Isua and Tussaap supracrustal belts of the Itsaq gneiss complex, southwestern Greenland, form the largest and best-preserved exposure of Eoarchean supracrustal materials on Earth. Previous studies have almost exclusively focused on the…
View article: Quantized compression of SAR data: Bounds on signal fidelity, InSAR PS candidates identification and surface motion accuracy
Quantized compression of SAR data: Bounds on signal fidelity, InSAR PS candidates identification and surface motion accuracy Open
Satellite radar imaging has been used as a remote sensing tool for studying Earth’s surface. High spatial resolution achieved by Synthetic Aperture Radar (SAR) allows to classify landcover and, using radar interferometry, to measure topogr…
View article: Making InSAR processing hardisks small again: Estimating the impact of Quantized Compressed SAR images on the precision of PS InSAR time series
Making InSAR processing hardisks small again: Estimating the impact of Quantized Compressed SAR images on the precision of PS InSAR time series Open
Modern satellites produce massive datasets. So, handling and processing bulk Synthetic Aperture Radar (SAR) imagery often represents a high entry level for researchers to tackle scientific challenges at regional or global scale. SAR imagin…
View article: Reassessment of the Phanerozoic net crustal growth: U–Pb and Hf zircon data for the Central Asian Orogenic Belt
Reassessment of the Phanerozoic net crustal growth: U–Pb and Hf zircon data for the Central Asian Orogenic Belt Open
The Central Asian Orogenic Belt (CAOB) consists of several continental blocks, was assembled during the Phanerozoic, and preserves large volumes of Phanerozoic granitoids with juvenile Nd and Hf isotope characteristics, and thus regarded a…
View article: Earth's Earliest Phaneritic Ultramafic Rocks: Mantle Slices or Crustal Cumulates?
Earth's Earliest Phaneritic Ultramafic Rocks: Mantle Slices or Crustal Cumulates? Open
When plate tectonics initiated remains uncertain, partly because many signals interpreted as diagnostic of plate tectonics can be alternatively explained via hot stagnant‐lid tectonics. One such signal involves the petrogenesis of early Ar…
View article: Reply to Comment by A.P. Nutman et al. on “Tectonics of the Isua Supracrustal Belt 1: P‐T‐X‐d Constraints of a Poly‐Metamorphic Terrane” by A. Ramírez‐Salazar et al. and “Tectonics of the Isua Supracrustal Belt 2: Microstructures Reveal Distributed Strain in the Absence of Major Fault Structures” by J. Zuo et al.
Reply to Comment by A.P. Nutman et al. on “Tectonics of the Isua Supracrustal Belt 1: P‐T‐X‐d Constraints of a Poly‐Metamorphic Terrane” by A. Ramírez‐Salazar et al. and “Tectonics of the Isua Supracrustal Belt 2: Microstructures Reveal Distributed Strain in the Absence of Major Fault Structures” by J. Zuo et al. Open
Structural and metamorphic analyses from the works under discussion (Ramírez‐Salazar et al., 2021, https://doi.org/10.1029/2020tc006516 ; Zuo et al., 2021, https://doi.org/10.1029/2020tc006514 ) show that the Isua supracrustal rocks can be…
View article: Using garnet to the fullest: The tectono-metamorphic evolution of the Eoarchean Isua supracrustal belt
Using garnet to the fullest: The tectono-metamorphic evolution of the Eoarchean Isua supracrustal belt Open
<p>The Eoarchean Isua supracrustal belt (ISB) represents a key supracrustal portion of one of the oldest km-scale regions of Archean crust exposed today. Microstructures and compositional zoning of garnets from the ISB have previousl…
View article: Editorial: Mountain Building
Editorial: Mountain Building Open
EDITORIAL article Front. Earth Sci., 21 October 2021 | https://doi.org/10.3389/feart.2021.789741
View article: Geology of non-plate tectonic regimes: detrital zircon age records and beyond
Geology of non-plate tectonic regimes: detrital zircon age records and beyond Open
<p>Studying the early evolution of terrestrial bodies in our solar systems is challenging. In part, this is because preserved early records are poorly preserved (e.g., Hadean rocks on Earth) and/or hard to access (e.g., rocks on Mars…
View article: Tectonics of the Isua Supracrustal Belt 1: P‐T‐X‐d Constraints of a Poly‐Metamorphic Terrane
Tectonics of the Isua Supracrustal Belt 1: P‐T‐X‐d Constraints of a Poly‐Metamorphic Terrane Open
The Eoarchean Isua supracrustal belt (ISB) has been interpreted as one of the earliest records of subduction processes, leading to the conclusion that a plate tectonic geodynamic system was likely operating since the early Archean. However…
View article: Tectonics of the Isua Supracrustal Belt 2: Microstructures Reveal Distributed Strain in the Absence of Major Fault Structures
Tectonics of the Isua Supracrustal Belt 2: Microstructures Reveal Distributed Strain in the Absence of Major Fault Structures Open
Archean geological records are increasingly interpreted to indicate a ≤3.2 Ga initiation of plate tectonics on Earth. This hypothesis contrasts with dominant plate tectonic interpretations for the Eoarchean (ca. 4.0–3.6 Ga) Isua supracrust…
View article: Miocene Subsidence and Surface Uplift of Southernmost Tibet Induced by Indian Subduction Dynamics
Miocene Subsidence and Surface Uplift of Southernmost Tibet Induced by Indian Subduction Dynamics Open
The Indus‐Yarlung suture of southernmost Tibet marks the initial collisional zone, the ongoing India‐Asia collision, and yet more than ~30 million years after the onset of collision, a thick detrital sedimentary unit was deposited just nor…