Results 21 to 30 of about 274,135 (269)

Ridge Jumps and Mantle Exhumation in Back-Arc Basins

Geosciences, 2021
Back-arc basins in continental settings can develop into oceanic basins, when extension lasts long enough to break up the continental lithosphere and allow mantle melting that generates new oceanic crust.
Valentina Magni, John Naliboff, Manel Prada, Carmen Gaina   +3 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

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

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

Crustal accretion at the Reykjanes Ridge, 61°–62°N [PDF]

We report results of a seismic, gravity, and magnetic survey of the Reykjanes Ridge spreading center at 61°–62°N, about 600 km from the center of the Iceland mantle plume.
Smallwood, John R., White, Robert S.
core   +1 more source

Images of Early Continental Breakup in and around the Gulf of California and the Role of Basal Shear in Producing Wide Plate Boundaries [PDF]

, 2004
Active faulting in the northern Gulf of California occurs over a broad zone, 70 x 200 km, affecting two-thirds of the width of new crust that has formed there starting at 6 Ma.
Persaud, Patricia
core   +1 more source

A technique for extracting gravity anomalies originating from sediments deposited on folded oceanic crust

Journal of the National Science Foundation of Sri Lanka
Negative gravity anomalies observed over sediments accumulated on folded oceanic crust are usually caused by two negative density contrasts. The first is the contrast between low-density sediments lying on folded high density oceanic crust and the ...
D. A. Tantrigoda, M. M. P. M. Fernando, S.A. Samaranayake   +2 more
doaj   +1 more source