Results 11 to 20 of about 1,154,465 (152)

Integrating Olivine Diffusion Chronometry With Monitoring Data to Decipher the Magma Dynamics at the Submarine Fani Maoré Volcano [PDF]

Geochemistry, Geophysics, Geosystems
Monitoring data are critical for understanding volcanic unrest and eruption, but they often lack the ability to constrain the pre‐eruptive magma processes.
Karoline Brückel, Etienne Médard, Fidel Costa, Carole Berthod, Pauline Verdurme, Patrick Bachèlery, Lise Retailleau, Jean‐Christophe Komorowski, Lucia Gurioli   +8 more
doaj   +3 more sources

DFENS: Diffusion chronometry using Finite Elements and Nested Sampling [PDF]

Geochemistry, Geophysics, Geosystems, 2020
In order to reconcile petrological and geophysical observations in the temporal domain, the uncertainties of diffusion timescales need to be rigorously assessed. Here we present a new diffusion chronometry method: Diffusion chronometry using Finite Elements and Nested Sampling (DFENS). This method combines a finite element numerical model with a nested
Mutch, Euan J. F., Maclennan, John, Shorttle, Oliver, Rudge, John F., Neave, David A.   +4 more
openaire   +8 more sources

Diffuser: A user-friendly program for diffusion chronometry with robust uncertainty estimation [PDF]

Computers and Geosciences, 2022
Chemical diffusion in minerals has shown great potential to quantify timescales of geological processes. The presence of chemical gradients, along with favorable temperature and time conditions, lead to the formation of measurable diffusion profiles ...
Xian-Hua Li, Yang Li, Michael Jollands   +2 more
exaly   +5 more sources

Diffusion chronometry of volcanic rocks [PDF]

, 2022
Diffusion of elements that result in compositional zoning in minerals in volcanic rocks may be used to determine the timescales of various volcanic processes (e.g., residence times in different reservoirs, ascent rates of magmas). Here, we introduce the tool and discuss the reasons for its gain in popularity in recent times, followed by a summary of ...
Chakraborty, Sumit (Prof. Dr.), Dohmen, Ralf (Dr. rer. nat.)   +1 more
core   +2 more sources

The Transition From Melt Accumulation to Eruption Initiation Recorded by Orthopyroxene Fe‐Mg Diffusion Timescales in Late Holocene Rhyolites, South Sister Volcano, Oregon Cascade Range

Geochemistry, Geophysics, Geosystems
South Sister volcano, Oregon Cascade Range, USA, has repeatedly erupted rhyolite since ca. 40 ka. The youngest such eruptions are the ca. 2 ka Rock Mesa and Devils Chain rhyolites, erupted several hundred years apart from two multi‐vent complexes ...
Nathan L. Andersen, Annika E. Dechert, Dawn C. S. Ruth, May (Mai) Sas, Julie Chouinard, Josef Dufek   +5 more
doaj   +2 more sources

Finite Element Method for Garnet Diffusion Chronometry

Geochemistry, Geophysics, Geosystems
AbstractCrystal geometries and boundary conditions significantly influence garnet diffusion chronometry results, yet they are frequently overlooked and pose challenges in the resolution of the diffusion equation under these complexities. To address these challenges, we introduced the Finite Element Method (FEM).
Hailin Wu, Lingsen Zeng, Rongfeng Ge, Wenbin Zhu   +3 more
openaire   +2 more sources

Petrogenesis of Very‐Low‐Ti Basalts Returned by Chang'e‐6 From the Lunar Farside

Geophysical Research Letters
Lunar volcanism provides critical insights into the Moon's thermochemical evolution. We present petrological and geochemical analyses of six very‐low‐Ti (VLT) basalt fragments from Chang'e‐6 (CE6) samples. These basalts yield a Pb‐Pb age of around 2.9 Ga,
Shitou Wu, Di Zhang, Heng‐Ci Tian, Wei Yang, Hao Wang, Yueheng Yang, Xu Tang, Chao Huang, Lihui Jia, Qiuli Li, Qin Zhou, Yi Chen, Sen Hu, Xian‐Hua Li, Fu‐Yuan Wu   +14 more
doaj   +2 more sources

Coupling magma ascent models with volatile diffusion chronometry

Earth and Planetary Science Letters
The pre- and syn-eruptive magma decompression rate is recognized as a key parameter modulating eruption dynamics, with explosive eruptions being generally associated with much larger decompression rates than effusive ones. Magma decompression rates cannot be directly measured and thus are typically inferred from petrological, geochemical, numerical ...
Fidel Costa, Olivier Bernard
exaly   +3 more sources

Time scales of olivine storage and transport as revealed by diffusion chronometry at Waitomokia Volcanic Complex, Auckland Volcanic Field, New Zealand

Journal of Volcanology and Geothermal Research
Detailed knowledge of the pre-eruptive time scales associated with magma storage and transport is vital to improve volcanic hazard forecasting in active volcanic regions. However, quantification of the timescales of volcanic processes at mafic volcanic centres in continental intraplate settings is challenging, despite them being a source of significant
Fidel Costa, Helena Albert
exaly   +5 more sources

Timescales of Magma Mixing Beneath the Iheya Ridge, Okinawa Trough: Implications for the Stability of Sub-Seafloor Magmatic Systems

Journal of Marine Science and Engineering, 2023
Submarine volcanic eruptions can be destructive for marine environments and resources. Magma mixing is considered to be an important trigger for volcanic eruptions.
Yuxiang Zhang, Zuxing Chen, Zhigang Zeng
doaj   +1 more source