Results 21 to 30 of about 908,025 (260)

Formation of an Al‐Rich Niccolite‐Type Silica in Subducted Oceanic Crust: Implications for Water Transport to the Deep Lower Mantle

Geophysical Research Letters, 2022
Subducted oceanic crust is enriched in free silica. Although being one of the silica polymorphs at lower‐mantle pressures, niccolite‐type phase (Nt‐phase) has not been documented in multicomponent metabasaltic or metasediment compositions relevant to ...
Lu Liu, Hongsheng Yuan, Yao Yao, Ziqiang Yang, Federico Aiace Gorelli, Nico Giordano, Lixin He, Eiji Ohtani, Li Zhang   +8 more
doaj   +1 more source

Continental Growth and Recycling in Convergent Orogens with Large Turbidite Fans on Oceanic Crust

Geosciences, 2013
Convergent plate margins where large turbidite fans with slivers of oceanic basement are accreted to continents represent important sites of continental crustal growth and recycling.
Ben D. Goscombe, David A. Foster
doaj   +1 more source

A New Model for the Evolution of Oceanic Transform Faults Based on 3D Broadband Seismic Observations From São Tomé and Príncipe in the Eastern Gulf of Guinea

Geochemistry, Geophysics, Geosystems, 2022
Oceanic Transform Faults are one of manifestations of the three major plate boundaries and a key tectonic feature of oceanic crust. They are broadly considered to accommodate strike‐slip displacement along simple vertical faults and to be largely without
Myron F. H. Thomas, Christian Heine, Jimmy vanItterbeeck, Ilya Ostanin, Andrey Seregin, Michael Spaak, Tamara Morales, Tess Oude Essink   +7 more
doaj   +1 more source

Burying Earth's Primitive Mantle in the Slab Graveyard

Geochemistry, Geophysics, Geosystems, 2021
The evolution of mantle composition can be viewed as a process of destruction whereby the initial chemical state is overprinted and reworked with time.
T. D. Jones, N. Sime, P. E. van Keken
doaj   +1 more source

IODP Expeditions 304 & 305 Characterize the Lithology, Structure, and Alteration of an Oceanic Core Complex [PDF]

Scientific Drilling, 2006
More than forty years after the Mohole Project (Bascom, 1961), the goal of drilling a complete section through in situ oceanic crust remains unachieved.
Christopher J. MacLeod, the IODP Expeditions 304–305 Scientists, D. Jay Miller, Yasuhiko Ohara, Barbara E. John, Donna Blackman, Benoit Ildefonse   +6 more
doaj   +1 more source

Formation of the Xigaze Metamorphic Sole under Tibetan continental lithosphere reveals generic characteristics of subduction initiation

Communications Earth & Environment, 2023
Metamorphic soles found under allochthonous oceanic lithosphere, or ophiolites, are interpreted as derived from lower plate oceanic crust material accreted to upper plate mantle during intraoceanic subduction initiation.
Carl Guilmette, Douwe J. J. van Hinsbergen, Matthijs A. Smit, Antoine Godet, François Fournier-Roy, Jared P. Butler, Marco Maffione, Shun Li, Kip Hodges   +8 more
doaj   +1 more source

Magnesium isotopic composition of altered oceanic crust and the global Mg cycle

Geochimica et Cosmochimica Acta, 2018
To investigate the behavior of Mg isotopes during low-temperature alteration of oceanic crust and to further understand its role in the global Mg cycle, we measured the Mg isotopic compositions (25Mg/24Mg and 26Mg/24Mg) of a set of samples of altered ...
Kang-Jun Huang, F. Teng, T. Plank, H. Staudigel, Yan Hu, Z. Bao   +5 more
semanticscholar   +1 more source

Body wave dispersion characteristics of regional deep earthquake at Southern Ryukyus subduction zone [PDF]

E3S Web of Conferences, 2022
The convergent plate boundaries known as the subduction zone is the location where the cold, hydrate, and old oceanic plate subduct under the hot, dry, and young continental plate. The top of the oceanic plate, i.e. the oceanic crust usually is less than
Haridhi Haekal A., Huang Bor-Shouh, Sianipar Dimas, Purnawan Syahrul, Setiawan Ichsan   +4 more
doaj   +1 more source

Margin-to-Margin Seafloor Spreading in the Eastern Gulf of Aden: A 16 Ma-Long History of Deformation and Magmatism from Seismic Reflection, Gravity and Magnetic Data

Frontiers in Earth Science, 2021
In this paper we present and analyze spreading-parallel seismic transects that image the oceanic crust in the eastern Gulf of Aden, from the Oman to the Socotra margins, across the active Sheba mid-oceanic ridge and between the Socotra-Hadbeen and ...
Morgane Gillard, Sylvie Leroy, Mathilde Cannat, Heather Sloan   +3 more
doaj   +1 more source

Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes

, 2018
Internal structures in mature oceanic crust can elucidate understanding of the processes and mechanism of crustal accretion. In this study, we present two multi-channel seismic (MCS) transects across the northern flank of the South China Sea basin to ...
W. Ding, Zhen Sun, K. Dadd, Yinxia Fang, Jiabiao Li   +4 more
semanticscholar   +1 more source