Results 11 to 20 of about 20,365 (298)

Initiation of a Proto-transform Fault Prior to Seafloor Spreading [PDF]

open access: greenGeochemistry, Geophysics, Geosystems, 2020
©2018. The Authors. Transform faults are a fundamental tenet of plate tectonics, connecting offset extensional segments of mid-ocean ridges in ocean basins worldwide. The current consensus is that oceanic transform faults initiate after the onset of seafloor spreading.
Finnigan Illsley‐Kemp   +9 more
openalex   +10 more sources

The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

open access: yesGeophysical Monograph Series, Page 229-246., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Alexander J. Dickson   +2 more
wiley  

+7 more sources

Magnetic signature of large exhumed mantle domains of the Southwest Indian Ridge – results from a deep-tow geophysical survey over 0 to 11 Ma old seafloor [PDF]

open access: yesSolid Earth, 2014
We investigate the magnetic signature of ultramafic seafloor in the eastern part of the Southwest Indian Ridge (SWIR). There, detachment faulting, continuous over 11 Myr, exhumed large areas of mantle-derived rocks.
A. Bronner   +6 more
doaj   +1 more source

Thermochemical anomalies in the upper mantle control Gakkel Ridge accretion

open access: yesNature Communications, 2021
The ultimate driver of ultraslow spreading ridges is unknown. Here the authors use spreading rates derived directly from isotopic ages of seafloor samples to link magmatic and amagmatic segments with thermochemical variations in the upper mantle.
John M. O’Connor   +5 more
doaj   +1 more source

Magnetic anomaly lineations in the Northeastern South China Sea and their implications for initial seafloor spreading

open access: yesFrontiers in Earth Science, 2023
Ridge jumps occurred during the spreading process of the South China Sea. Recent research on the lower crustal reflectors event on seismic profiles found at least two southward ridge jumps, but only one has been confirmed by geomagnetic data.
Zhaocai Wu   +4 more
doaj   +1 more source

Regional Variations in the Spreading‐Rate Dependence of Abyssal Hill Roughness as Indicators of Mantle Heterogeneity

open access: yesGeophysical Research Letters, 2023
Abyssal hills are potential proxy records of mid‐ocean ridge faulting and volcanism, as well as the spreading rates and mantle properties that influence these processes.
John A. Goff
doaj   +1 more source

Morphotectonic Analysis of the East Manus Basin, Papua New Guinea

open access: yesFrontiers in Earth Science, 2021
Backarc basin systems are important sites of extension leading to crustal rupture where basin development typically occurs in rifting phases (or stages) with the final successful stages identified by the formation of spreading ridges and new oceanic ...
Nicholas J. Dyriw   +6 more
doaj   +1 more source

Geomorphological and Spatial Characteristics of Underwater Volcanoes in the Easternmost Australian-Antarctic Ridge

open access: yesRemote Sensing, 2021
Underwater volcanoes and their linear distribution on the flanks of mid-ocean ridges are common submarine topographic structures at intermediate- and fast-spreading systems, where sufficient melt supplies are often available.
Hakkyum Choi   +3 more
doaj   +1 more source

Continental breakup and UHP rock exhumation in action: GPS results from the Woodlark Rift, Papua New Guinea [PDF]

open access: yes, 2015
We show results from a network of campaign Global Positioning System (GPS) sites in the Woodlark Rift, southeastern Papua New Guinea, in a transition from seafloor spreading to continental rifting. GPS velocities indicate anticlockwise rotation (at 2–2.7°
Ellis, Susan   +9 more
core   +1 more source

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