Darren F. Mark
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View article: The Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS) Mission Design
The Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS) Mission Design Open
View article: Volcanism records plate thinning driven rift localization in Afar (Ethiopia) since 2-2.5 million years ago
Volcanism records plate thinning driven rift localization in Afar (Ethiopia) since 2-2.5 million years ago Open
Magma-rich continental rifting and breakup commonly show complex distributions of volcanism, potentially due to both plume and rifting controls. As such, interpreting the main controls on the spatial evolution of magmatism is debated, as i…
View article: Dating recent aqueous activity on Mars
Dating recent aqueous activity on Mars Open
Amazonian-age Martian meteorites contain products of indigenous aqueous alteration; yet, establishing when this alteration occurred, and therefore when liquid water was available in the planet’s crust, has proven challenging. New 40Ar/39Ar…
View article: Dynamic collapse and regrowth of the Antarctic Ice Sheet in the Weddell Sea sector during the middle Miocene: A novel multi-proxy sedimentary provenance approach using in-situ 87Rb/87Sr dating of detrital K-feldspar
Dynamic collapse and regrowth of the Antarctic Ice Sheet in the Weddell Sea sector during the middle Miocene: A novel multi-proxy sedimentary provenance approach using in-situ 87Rb/87Sr dating of detrital K-feldspar Open
View article: The influence of the lithosphere on deep-origin volcanism
The influence of the lithosphere on deep-origin volcanism Open
Eastern Australia and the neighbouring Tasman and Coral Seas are home to extensive age-progressive volcanism spanning from ~55 Ma in the north to ~6 Ma in the south. This volcanism forms two offshore seamount trails, the Lord Howe and the …
View article: Clumped isotope and Δ17O measurements of carbonates in CM carbonaceous chondrites: New insights into parent body thermal and fluid evolution
Clumped isotope and Δ17O measurements of carbonates in CM carbonaceous chondrites: New insights into parent body thermal and fluid evolution Open
The CM carbonaceous chondrites are key archives for understanding the earliest history of the solar system. Their C-complex asteroid parent body(ies) underwent aqueous alteration, among the products of which are carbonate minerals that can…
View article: The >250-kyr Lake Chala record: A tephrostratotype correlating archaeological, palaeoenvironmental and volcanic sequences across eastern Africa
The >250-kyr Lake Chala record: A tephrostratotype correlating archaeological, palaeoenvironmental and volcanic sequences across eastern Africa Open
Regional tephrostratigraphic frameworks connect palaeoclimate, archaeological and volcanological records preserved in soils or lake sediments via shared volcanic ash (tephra) layers. In eastern Africa, tracing of tephra isochrons between g…
View article: Synchronising rock clocks of Mars' history: Resolving the shergottite 40Ar/39Ar age paradox
Synchronising rock clocks of Mars' history: Resolving the shergottite 40Ar/39Ar age paradox Open
View article: Eruption history of the Columbia River Basalt Group constrained by high-precision U-Pb and 40Ar/39Ar geochronology
Eruption history of the Columbia River Basalt Group constrained by high-precision U-Pb and 40Ar/39Ar geochronology Open
View article: Slab-failure or Slab-success? Examining the contributions of crust and mantle to post-subduction magmatism in the Ratagain Complex, NW Scotland
Slab-failure or Slab-success? Examining the contributions of crust and mantle to post-subduction magmatism in the Ratagain Complex, NW Scotland Open
The Ratagain Complex is an enigmatic Late Caledonian granitic intrusion and a member of the high Basingle bondSr Northern Highlands granite (NHG) suite that has been related to slab failure. Slab failure magmatism explains varying contribu…
View article: The Louisiade Plateau Large Igneous Province in the Coral Sea, northeast of Australia.
The Louisiade Plateau Large Igneous Province in the Coral Sea, northeast of Australia. Open
View article: First Principles Calibration of <scp><sup>40</sup>Ar</scp> Abundances in <scp><sup>40</sup>Ar</scp>/<scp><sup>39</sup>Ar</scp> Mineral Neutron Fluence Monitors: Methodology and Preliminary Results
First Principles Calibration of <span><sup>40</sup>Ar</span> Abundances in <span><sup>40</sup>Ar</span>/<span><sup>39</sup>Ar</span> Mineral Neutron Fluence Monitors: Methodology and Preliminary Results Open
The accuracy and traceability of geochronometers are of vital importance to questions asked by many Earth scientists. The widely applied 40 Ar/ 39 Ar geochronometer relies on the co‐irradiation of samples with neutron fluence monitors (ref…
View article: Geochemistry of the Pepom tephra deposits: The most recent intracaldera volcanism of Sete Cidades volcano, São Miguel, Azores
Geochemistry of the Pepom tephra deposits: The most recent intracaldera volcanism of Sete Cidades volcano, São Miguel, Azores Open
View article: Low Paleointensities and Ar/Ar Ages From Saint Helena Provide Evidence for Recurring Magnetic Field Weaknesses in the South Atlantic
Low Paleointensities and Ar/Ar Ages From Saint Helena Provide Evidence for Recurring Magnetic Field Weaknesses in the South Atlantic Open
The South Atlantic Anomaly (SAA) is an area of geomagnetic weakness that represents the most significant anomaly in the present‐day field. Notwithstanding anomalies such as these, a long‐lived hypothesis is that, if averaged over sufficien…
View article: Age of the oldest known Homo sapiens from eastern Africa
Age of the oldest known Homo sapiens from eastern Africa Open
View article: New Oldowan localities at high level within Kilombe Caldera, Kenya
New Oldowan localities at high level within Kilombe Caldera, Kenya Open
View article: From the Middle Triassic Cima Pape complex (Dolomites; Southern Alps) to the feeding systems beneath active volcanoes: Clues from clinopyroxene textural and compositional zoning
From the Middle Triassic Cima Pape complex (Dolomites; Southern Alps) to the feeding systems beneath active volcanoes: Clues from clinopyroxene textural and compositional zoning Open
Crystal zoning plays a fundamental role in modern volcanology as a key to unravel the geometry and the dynamics of plumbing systems. In this study, a detailed textural and compositional study of clinopyroxene crystals entrained in intrusiv…
View article: This was provided by anonymous reviewer
This was provided by anonymous reviewer Open
Abstract. The Martabe gold deposits in Sumatra formed in a shallow crustal epithermal environment associated with intermediate mafic intrusions adjacent to an active right-lateral wrench system. Gas/fluid temperatures reac…
View article: Comment on gchron-2021-25
Comment on gchron-2021-25 Open
Abstract. The Martabe gold deposits in Sumatra formed in a shallow crustal epithermal environment associated with intermediate mafic intrusions adjacent to an active right-lateral wrench system. Gas/fluid temperatures reac…
View article: Reconstructing the middle to late Pleistocene explosive eruption histories of Popocatépetl, Iztaccíhuatl and Tláloc-Telapón volcanoes in Central México
Reconstructing the middle to late Pleistocene explosive eruption histories of Popocatépetl, Iztaccíhuatl and Tláloc-Telapón volcanoes in Central México Open
View article: The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction
The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction Open
The Boltysh impact structure formed 0.65 Ma after the K-Pg boundary, coincident with the Lower C29n hyperthermal.
View article: Time scales for pluton growth, magma chamber formation and super-eruptions
Time scales for pluton growth, magma chamber formation and super-eruptions Open
Generation of silicic magmas leads to emplacement of granite plutons, huge explosive volcanic eruptions and physical and chemical zoning of continental and arc crust1-7. While the time scales for silicic magma generation in the deep and mi…
View article: Explosive felsic eruptions on ocean islands: A case study from Ascension Island (South Atlantic)
Explosive felsic eruptions on ocean islands: A case study from Ascension Island (South Atlantic) Open
Ocean island volcanism is generally considered to be dominated by basaltic eruptions, yet felsic products associated with more hazardous explosive eruptive events are also present in the geological record of many of these islands. Ascensio…
View article: From the Finero phlogopite peridotite to the shoshonitic magmatism of the Dolomites: unveiling the evolution of the Sub-Continental Lithospheric Mantle beneath the Southern Alps (Northern Italy)
From the Finero phlogopite peridotite to the shoshonitic magmatism of the Dolomites: unveiling the evolution of the Sub-Continental Lithospheric Mantle beneath the Southern Alps (Northern Italy) Open
<p>The Mid-Triassic emplacement of shoshonitic magmas at the NE margin of the Adria plate in concomitance with extensional/transtensional tectonics is one of the most intriguing and peculiar aspects typifying the geodynamic evolution…
View article: Building an accurate and precise chronological framework for the British Palaeogene Igneous Province
Building an accurate and precise chronological framework for the British Palaeogene Igneous Province Open
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View article: Production of <sup>40</sup> Ar by an overlooked mode of <sup>40</sup> K decay with implications for K-Ar geochronology
Production of <sup>40</sup> Ar by an overlooked mode of <sup>40</sup> K decay with implications for K-Ar geochronology Open
The decay of 40K to the stable isotopes 40Ca and 40Ar is used as a measure of time for both the K-Ca and K-Ar geochronometers, the latter of which is most generally utilized by the variant 40Ar∕39Ar system. The increasing precision of geoc…
View article: Geochronology of a long Pleistocene sequence at Kilombe volcano, Kenya: from the Oldowan to Middle Stone Age
Geochronology of a long Pleistocene sequence at Kilombe volcano, Kenya: from the Oldowan to Middle Stone Age Open
View article: The Variscan subduction inheritance in the Southern Alps Sub-Continental Lithospheric Mantle: Clues from the Middle Triassic shoshonitic magmatism of the Dolomites (NE Italy)
The Variscan subduction inheritance in the Southern Alps Sub-Continental Lithospheric Mantle: Clues from the Middle Triassic shoshonitic magmatism of the Dolomites (NE Italy) Open
View article: Petrogenesis of Siletzia: The world's youngest oceanic plateau
Petrogenesis of Siletzia: The world's youngest oceanic plateau Open
Siletzia is an accreted Palaeocene-Eocene Large Igneous Province, preserved in the northwest United States and southern Vancouver Island. Although previous workers have suggested that components of Siletzia were formed in tectonic settings…
View article: Late Silurian zircon U–Pb ages from the Ludlow and Downton bone beds, Welsh Basin, UK
Late Silurian zircon U–Pb ages from the Ludlow and Downton bone beds, Welsh Basin, UK Open
The Ludlow Bone Bed (Welsh Basin) is a critical stratigraphic horizon and contains a rich assemblage of fish scales. Units above provide insights into the early evolution of animal and plant life. The bed has not yet been radioisotopically…