Results 61 to 70 of about 530,755 (252)

Self-replicating subduction zone initiation by polarity reversal

Communications Earth & Environment, 2022
New subduction zones can form via a self-replicating process, without the need for external forcing, when buoyant blocks reach pre-existing subduction trenches and cause polarity reversals, according to 3D numerical ...
Jaime Almeida, Nicolas Riel, Filipe M. Rosas, João C. Duarte, Boris Kaus   +4 more
doaj   +1 more source

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

Subduction initiation without magmatism:The case of the missing Alpine magmatic arc [PDF]

, 2018
Models of orogens identify subduction of oceanic crust as the key mechanism leading to continental collision. Such models, based inter alia on thermobarometric and geochronological evidence preserved in high-pressure metamorphic rocks and subduction ...
Blundy, Jon, McCarthy, Anders, Chelle-Michou, Cyril, Arculus, Richard J, Chelle-Michou, Cyril; id_orcid, Müntener, Othmar, Arculus, Richard, Anders, McCarthy, Blundy, J. D.   +8 more
core   +2 more sources

Patterns of Late Cenozoic exhumation deduced from apatite and zircon U-He ages from Fiordland, New Zealand [PDF]

, 2005
New apatite and zircon (U-Th)/He ages from the Fiordland region of New Zealand's South Island expand on earlier results and provide new constraints on patterns of Late Cenozoic exhumation and cooling across this region.
House, Martha A., R. Sutherland, M. Gurnis, Gurnis, Michael, M. A. House, Kamp, Peter J.J., Sutherland, Rupert, P. J. J. Kamp   +7 more
core   +1 more source

Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen

Geological Journal, EarlyView.
By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang, Aibing Chen, Jian Yang, Yuan Zhang   +3 more
wiley   +1 more source

Subduction Initiation at the Corner of Small Oceanic Basins

Geophysical Research Letters
In Southeast Asia, emerging subduction zones often appear to begin at the corners of small oceanic basins, which have a triangular‐indenter continent–ocean boundary geometry.
Miao Dong, Tianyao Hao, Yue Li, Jian Zhang, Gui Fang   +4 more
doaj   +1 more source

Reaction-induced rheological weakening enables oceanic plate subduction

Nature Communications, 2016
Plate subduction initiation requires weak boundaries between tectonic plates, but how weaknesses develop is unclear. Here, using high-pressure friction experiments on peridotite gouge material, the authors show that hydration reactions contribute to the ...
Ken-ichi Hirauchi, Kumi Fukushima, Masanori Kido, Jun Muto, Atsushi Okamoto   +4 more
doaj   +1 more source

Subduction initiation along transform faults: The proto-Franciscan subduction zone [PDF]

Lithosphere, 2012
The initiation of subduction is a process that cannot be observed directly but must be inferred from the rock record after subduction is well established. There are many approaches possible to infer the origin of subduction zones that are still active, but paleosubduction zones present special challenges, since their geodynamic setting can no longer be
John W. Shervais, Sung Hi Choi
openaire   +1 more source

Multiphase Tectonic Process With Slab Dynamics in the Northern East China Sea Shelf Basin

Geological Journal, EarlyView.
Megasequence 1 characterised by Palaeocene extension and differential subsidence driven by the rollback of the subducting Izanagi Plate. Megasequence 2 records a kinematic reorganisation of the East Asian margin, transition from a rifting to a compressional regime.
Juhwan Woo, Won‐Ki Kim, Chul Woo Rhee, Seungyeol Lee   +3 more
wiley   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source