Results 41 to 50 of about 584,672 (302)

Transient Injection of Flow: How Torn and Bent Slabs Induce Unusual Mantle Circulation Patterns Near a Flat Slab

Geochemistry, Geophysics, Geosystems, 2023
Torn and bent slabs are usually associated with flat‐slab subduction where the descending plate develops a horizontal geometry beneath the overlying continent.
Xiaowen Liu, Russell Pysklywec
doaj   +1 more source

Early cretaceous bimodal volcanic rocks in Wuga Co area, central tibet: The first identification of direct products derived from slab sinking in the Bangong-Nujiang suture zone

Frontiers in Earth Science, 2023
Introduction: The Bangong-Nujiang Suture Zone (BNSZ) in central Tibet is a remnant of the Bangong-Nujiang Ocean that records its entire Wilson Cycle.
Wei Chen, Zhibo Liu, Nan Wang, Genhou Wang, Ming Zheng, Ning Han, Yiling Hu, Xukun Yan   +7 more
doaj   +1 more source

Upper mantle melt caused by a subducted slab in the Indian-Eurasian continental subduction zone

Communications Earth & Environment, 2023
A low-velocity layer atop the mantle transition zone has been extensively observed worldwide. In subduction zones, this layer is widely explained as partial melting triggered by slab subduction on a regional or global scale. However, direct observational
Guohui Li, Yuanze Zhou, Ling Bai, Yuan Gao, Yanan Li   +4 more
doaj   +1 more source

Hf isotopic evidence for small‐scale heterogeneity in the mode of mantle wedge enrichment: Southern Havre Trough and South Fiji Basin back arcs

Geochemistry, Geophysics, Geosystems, 2011
Magmas from SW Pacific back‐arc basins have geochemical and isotopic signatures indicating variable mantle and subduction‐derived components. Basalts from South Fiji Basin (SFB) are little influenced by subduction, but come from variably enriched mantle,
E. Todd, J. B. Gill, R. J. Wysoczanski, Janet Hergt, I. C. Wright, M. I. Leybourne, N. Mortimer   +6 more
doaj   +1 more source

Geochemistry and Structure of Krakatoa Volcano in the Sunda Strait, Indonesia

Geosciences, 2018
The violent eruption of Krakatoa Volcano located in the Sunda Strait, Indonesia, in 1883 represents one of the deadliest eruptions in human civilization.
Mirzam Abdurrachman, Sri Widiyantoro, Bambang Priadi, Taufik Ismail   +3 more
doaj   +1 more source

Pliocene adakite-like accent of andesites and dacites from the Orlov volcanic field (Sakhalin Island)

Геосистемы переходных зон, 2021
Adakite-like geochemical signature (high Sr/Y ratio at a low Y concentration) is recognized in andesites and dacites, associated with intraplate basalts in the Orlov volcanic field of Sakhalin Island.
Sergei V. Rasskazov, Alexander V. Rybin, Artem V. Degterev, Irina S. Chuvashova, Tatyana A. Yasnygina, Elena V. Saranina   +5 more
doaj   +1 more source

Petrogenesis of the Morobe Granodiorite and their shoshonitic mafic microgranular enclaves in Maramuni arc, Papua New Guinea

Open Geosciences, 2023
The Miocene tectonics of Papua New Guinea, where subduction, arc-continent collision, and changes in subduction direction are considered to have occurred, is very complex and various tectonic models have been proposed.
Hoshide Takashi, Bokuik Angela, Ishikawa Tatsuki   +2 more
doaj   +1 more source

Backarc Lithospheric Thickness and Serpentine Stability Control Slab‐Mantle Coupling Depths in Subduction Zones

Geochemistry, Geophysics, Geosystems, 2021
A key feature of subduction zone geodynamics and thermal structure is the point at which the slab and mantle mechanically couple. This point defines the depth at which traction between slab and mantle begins to drive mantle wedge circulation and also ...
Buchanan C. Kerswell, Matthew J. Kohn, Taras V. Gerya   +2 more
doaj   +1 more source

Evidence suggests slab melting in arc magmas [PDF]

Eos, Transactions American Geophysical Union, 2001
Most recent geology textbooks state that subduction‐related volcanism is due to the melting of the down‐going lithosphere. However, for the last 30 years, few in the field have seriously believed that the subducting slab is the source of arc basalts. The accepted hypothesis involves melting of the mantle wedge above the slab via hydrous fluids produced
Marc J. Defant, Pavel Kepezhinskas
openaire   +1 more source

Generation of normal and adakite-like calc-alkaline magmas in a non-subductional environment: An Sr-O-H isotopic study of the Apuseni Mountains neogene magmatic province, Romania

, 2007
Neogene magmatism in the Apuseni Mountains of Romania was active between 15 and 7 Ma, with an isolated final eruption at 1.6 Ma. Several groups of magmatic rocks can be distinguished in the province on the basis of ages, trace elements and isotopic ...
Hilary Downes, Ana-Voica Bojar, Sonia Tonarini, Bojar, A.V., Mason, P.R.D., Ioan Seghedi, Paul Mason, Seghedi, I., Downes, Hilary, Rosu, E., Tonarini, S., Emilian Roşu   +11 more
core   +1 more source