Institut de physique du globe de Paris

Transform-to-thrust reactivation of a fossil back-arc spreading system: Evidence from marine magnetic anomalies in the East Sea (Japan Sea)

Transform faults contain rheological weaknesses that can be reactivated into either divergent or convergent boundaries, depending on tectonic stress regime. While rifting triggered from transform fault is well documented, geophysical evidence demonstrating compressional reactivat...

Potassium isotopes reveal lithospheric control on the evolution of deep-sourced carbonated silicate magmas

Kimberlites and related CO2-rich ultramafic rocks such as aillikites commonly show Nd-Hf isotope decoupling (unradiogenic εHf at a given εNd), attributed to either recycled oceanic slabs or interaction with metasomatized continental lithospheric mantle (CLM). We present potassium...

Sensitivity of neutrino oscillations to the Earth’s interior properties

Understanding the Earth’s deep interior remains challenging, as traditional geophysical methods face ambiguities in linking seismic observations to temperature, composition, or mass density variations. Atmospheric neutrinos, produced by the constant flux of cosmic rays colliding...

Multi-GNSS clock combination for PPP with an epoch-wise clock alignment and variance component estimation

Abstract Applications of Global Navigation Satellite Systems (GNSS) for positioning, navigation, and timing rely on precise orbit and satellite clock corrections provided by multiple Analysis Centers (ACs) of the International GNSS Service (IGS). To address modeling errors and da...

Redox Transformation of Platinum Mediated by Natural Organic Matter Revealed by X-ray Absorption Spectroscopy

Abstract Platinum (Pt) is an emerging environmental contaminant due to its increasing anthropogenic use, yet the processes controlling its speciation remain poorly understood. Here, we investigate Pt redox transformations in the presence of natural organic matter (NOM) using X-ra...

The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites

Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share...

Post launch spectral and radiometric performances of MAJIS, the VIS-NIR imaging spectrometer of JUICE

Abstract. The post-launch spectral and radiometric performances of MAJIS, the VISNIR imaging spectrometer of the ESA Jupiter Icy Moon Explorer (JUICE), have been evaluated using observations performed during the Lunar-Earth Gravitational Assist (LEGA) of 19–20 August 2024 and obs...

A ReSCAL-based numerical study on synergistic optimization of photovoltaic arrays for sand control and power generation

In arid desert environments, photovoltaic (PV) arrays not only serve as clean energy suppliers, but also act as physical barriers to mitigate wind-blown sand movement. Based on the Real-Space Cellular Automaton Laboratory (ReSCAL), this study explores the coupled effects of PV ar...

Ryugu and Bennu preserve primordial isotopic heterogeneity absent from the meteorite record

Ivuna-type (CI) carbonaceous chondrites are commonly used as proxies for the composition of the planet-forming disk because their chemical abundances resemble those of the solar photosphere. However, their isotopic uniformity may reflect pervasive alteration and isotopic averagin...

Trace Elements in Total Atmospheric Deposition Directly Measured Over the Caribbean Region: Natural Versus Anthropogenic Sources and Geographic Origin

Abstract Dust, sea salt, and anthropogenic and biogenic particles in total atmospheric deposition are sources of essential elements that can significantly impact biogeochemical cycles in the Atlantic Ocean and in islands of the Caribbean region. This unique 41‐month data set reco...

Iron Isotopes Reveal Fe Export Driven by Change of Tropical Weathering Regime

Abstract Unraveling paleoenvironmental signals recorded in laterites is crucial for quantifying weathering‐driven elemental fluxes at the Earth's surface. New stable iron isotope data (δ 56 Fe), combined with (U‐Th)/He ages in Fe‐oxides from a ferruginous duricrust from French Gu...

Dike‐Induced Earthquakes as Probes of the Local Stress Field Prior to the 1998 Eruption of the Piton de la Fournaise Volcano, La Réunion

Abstract Volcano‐tectonic (VT) earthquakes generated during dike propagation provide useful constraints on stress changes in volcanic systems. During the 1998 pre‐eruptive unrest at Piton de la Fournaise, ∼600 VT earthquakes were recorded. Using manually picked first‐motion polar...

Melt burst events in a dominantly amagmatic lithosphere at Gakkel Ridge in the Arctic Ocean

Abstract Alternation of magmatic and amagmatic seafloor along the slow and ultraslow spreading ridges is common. Yet, temporal variation is obscured by sediments blanketing oceanic basement away from spreading centers. Here we analyze aeromagnetic data covering zero age to ~35 Ma...

Very‐Long‐Period Seismic Signals During Lateral Dike Propagation at Piton de La Fournaise Volcano

Abstract We report a previously undocumented sequence of very long period (VLP) signals preceding the September 2022 eruption at Piton de la Fournaise. These events occurred during lateral magma propagation and exhibit quasi‐periodic sawtooth‐shaped displacement transients. Seism...