Transtension and alkaline magmatism of the Romanche Fracture Zone

Kashintsev, Georgy L; Shreider, A. A.; Максимочкин, В. И.; Булычев, А. А.; Gilod, D. A.

doi:10.1134/s0016852108040055

Cited by 6 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, tectonic corridors have been identified along the southern MAR with similar geophysical and geochemical characteristics that appear to span broader sections of the ridge axis (hundreds of km) and several TFs (Kane & Hayes 1992). There are some transforms, however, that show strong variations across them, such as the Romanche TF, which marks a regional boundary in the geochemistry (Kashintsev et al 2008) and possibly in the thermal structure of the underlying mantle (Bonatti et al 2001).…”

Section: Geophysical Properties Of Discontinuities and Ridge Segmentsmentioning

confidence: 99%

Tectonic and magmatic segmentation of the Global Ocean Ridge System: a synthesis of observations

Carbotte

Smith

Cannat

et al. 2015

View full text Add to dashboard Cite

Mid-ocean ridges display tectonic segmentation defined by discontinuities of the axial zone, and geophysical and geochemical observations suggest segmentation of the underlying magmatic plumbing system. Here, observations of tectonic and magmatic segmentation at ridges spreading from fast to ultraslow rates are reviewed in light of influential concepts of ridge segmentation, including the notion of hierarchical segmentation, spreading cells and centralized v. multiple supply of mantle melts. The observations support the concept of quasi-regularly spaced principal magmatic segments, which are 30-50 km long on average at fast-to slow-spreading ridges and fed by melt accumulations in the shallow asthenosphere. Changes in ridge properties approaching or crossing transform faults are often comparable with those observed at smaller offsets, and even very small discontinuities can be major boundaries in ridge properties. Thus, hierarchical segmentation models that suggest large-scale transform fault-bounded segmentation arises from deeper level processes in the asthenosphere than the finer-scale segmentation are not generally supported. The boundaries between some but not all principal magmatic segments defined by ridge axis geophysical properties coincide with geochemical boundaries reflecting changes in source composition or melting processes. Where geochemical boundaries occur, they can coincide with discontinuities of a wide range of scales.Discovery and interpretations of mid-ocean ridge (MOR) segmentation: historical review

show abstract

Section: Geophysical Properties Of Discontinuities and Ridge Segmentsmentioning

confidence: 99%