Results 21 to 30 of about 2,889,255 (157)

Pyroclastic Density Currents, understanding the deadly flow from volcanic eruptions

, 2020
Pyroclastic Density Currents are hazardous, geophysical flows arising from volcanic activity that pose a significant risk to communities in close proximity to volcanoes.
Sun, Jin, Barker, Thomas, Greiner, Danny-Lee   +2 more
core   +1 more source

Spontaneous unsteadiness and sorting in pyroclastic density currents and their deposits [PDF]

Pyroclastic density currents form from a range of volcanic eruption styles, as well as lava dome collapse and retrogressive failure of existing deposits.
Pete Rowley (21566552), Gregory Smith (2393290), Olivier Roche (2364340), Nemi Walding (16410684), Matthew Johnson (261937), Natasha Dowey (21566554), Dan Parsons (13768621), Rebecca Williams (10184579), Thomas Johnston (22357763), Alison Provost (22357765)   +9 more
core   +3 more sources

Ash aggregate-rich pyroclastic density currents of the 431 CE Tierra Blanca Joven eruption, Ilopango caldera, El Salvador [PDF]

, 2023
The VEI 6, Tierra Blanca Joven pyroclastic sequence (30–90 km3 DRE volume), erupted from Ilopango caldera, El Salvador, in 431 CE, is the product of one of the largest eruptions of the last two millennia.
Brown, Richard J., Tournigand, Pierre-Yves, Vallance, James W., James W. Vallance, Richard J. Brown, Van Eaton, Alexa R., Condren, Pearce, Alexa R. Van Eaton, Sweeney, Clare, Walter Hernández, Clare Sweeney, Pearce Condren, Pierre-Yves Tournigand, Hernández, Walter   +13 more
core   +1 more source

Large-scale volcanic deposit fluidization by dilute pyroclastic density currents

, 2023
co-auteur étrangerInternational audienceThere is increasing evidence that fine-grained deposits of pyroclastic density currents can be remobilized on a large scale, resulting in concentrated flows.
Kelfoun, Karim, Proaño, Antonio
core   +1 more source

Small-Scale Lateral Variations in the Post-Plinian AD 79 Pyroclastic Density Currents Deposits

, 2021
Plinian eruptions form a sequence of pyroclastic fall deposits commonly overlain by ignimbrites. Partial column collapses often form intraplinian pyroclastic density currents (PDCs), and sustained column phases punctuate late, prevalent column collapse ...
Perrotta A., Santangelo I., Scarpati C., Fedele L., Chiominto G.   +4 more
core  

Replacement of Ores Recorded by Textures and Chemical Compositions of Sphalerite: An Example From the Furutobe Kuroko Deposit, Akita, Japan

Geological Journal, EarlyView.
Coupled dissolution‐reprecipitation of early formed Cd‐, Fe‐, Ag‐ and Sb‐poor sphalerite through interaction with high‐temperature and high‐sulphur fugacity Cu‐rich fluids, responsible for the formation of the yellow ores, resulted in the formation of Cd‐, Fe‐, Ag‐ and Sb‐rich, heavily chalcopyrite‐diseased sphalerite and enrichment of critical metals ...
Manuel Nopeia, Ryohei Takahashi, Andrea Agangi, Pearlyn Manalo, Hinako Sato   +4 more
wiley   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Miocene to Quaternary Tectonostratigraphic Evolution of the Northern Section of the Burdur‐Fethiye Shear Zone, South‐Western Türkiye

Geological Journal, EarlyView.
New zircon ages reveal that lacustrine sedimentation initiated in the Late Miocene (Messinian), revising earlier Pliocene age assignments. The study results support the interpretation of the northern BFSZ as a broad left‐lateral transtensional shear zone rather than a discrete sinistral fault or simple extensional graben array.
İrem Elitez, Gürsel Sunal, Cenk Yaltırak, İsak Yılmaz   +3 more
wiley   +1 more source

A numerical investigation of high-Reynolds-number constant-volume non-Boussinesq density currents in deep ambient [PDF]

, 2011
The time-dependent behaviour of non-Boussinesq high-Reynolds-number density currents, released from a lock of height h0 and length x0 into a deep ambient and spreading over horizontal flat boundaries, is considered.
S. BALACHANDAR, Ungarish, Marius, THOMAS BONOMETTI, Balachandar, S., Balachandar, Sivaramakrishnan, Bonometti, Thomas, MARIUS UNGARISH   +6 more
core   +1 more source