Corrigendum to: ‘Spatial and Temporal Scale of Mantle Enrichment at the Endeavour Segment, Juan de Fuca Ridge’

Gill, James B.; Michael, Peter J.; Woodcock, J.; Dreyer, B. M.; Ramos, Frank C.; Clague, David A.; Kela, J.; Scott, Sean; Konrad, Kevin; Stakes, Debra S.

doi:10.1093/petrology/egy076

Cited by 1 publication

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“…Third‐ and fourth‐ segment names are indicated. (b) Map of the distribution of the lava samples from remotely operated vehicle dives colored by basalt type from depleted to enriched mid‐ocean ridge basalt (Gill et al, ). (c) Distribution of flow minimum ages determined using sulfide samples from Jamieson et al () and 14 C ages from the basal section of sediment cores from Clague et al (; triangles and circles, respectively, subdivided using the same age color code).…”

Section: Observationsmentioning

confidence: 99%

“…Lava compositions along the Endeavour Segment vary from depleted to enriched mid‐ocean ridge basalt (MORB) and are distributed in seven chemically distinct basalt types (Figure b; Gill et al, ; ). Rock sampling was focused on the center part of the segment within and on both sides of AV2.…”

Section: Observationsmentioning

confidence: 99%

“…However, AV1 and AV2 show two distinct compositions. AV1 lavas are normal MORB composition, while AV2 lavas are primarily composed of enriched and transitional MORB with few normal MORB close to the axis (Gill et al, )…”

Section: Observationsmentioning

confidence: 99%

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Evolution of Fine‐Scale Segmentation at Intermediate‐Spreading Rate Ridges

Saout

Clague

Paduan

2019

Geochem Geophys Geosyst

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Mid‐ocean ridge axes are marked by segmentation of the axes and underlying magmatic systems. Fine‐scale segmentation has mainly been studied along fast‐spreading ridges. Here we offer insight into the third‐ and fourth‐order segmentation of intermediate‐spreading ridges and their temporal evolution. The Alarcón Rise and the Endeavour Segment have similar spreading rates (49 and 52.5 mm/year, respectively) but contrasting morphologies that vary from an axial high with a relatively narrow axial summit trough to an axial valley. One‐meter resolution bathymetry acquired by autonomous underwater vehicles, lava geochemistry, and ages from sediment cores is combined with available seismic reflection profiles to analyze variations in (1) geometry and orientation of the axial summit trough or valley, (2) seafloor depth near the axis, and (3) distribution of hydrothermal vents, (4) lava chemistry, and (5) flow ages between contiguous axes. Along both intermediate‐spreading segments, third‐ and fourth‐order discontinuities and associated segments are similar in dimension to what has been observed along fast‐spreading ridges. The Alarcón Rise and the Endeavour Segment also allow the study of the evolution of fine‐scale segmentation over periods of 300 to 4,000 years. Comparison between old and young axes reveals that the evolution of fine‐scale segmentation depends on the intensity of the magmatic activity. High magmatic periods are associated with rapid evolution of third‐order segments, while low magmatic activity periods, dominated by tectonic deformation and/or hydrothermal activity, are associated with little to no change in segmentation.

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Section: Observationsmentioning

confidence: 99%

Section: Observationsmentioning

confidence: 99%