Development of volcanic passive margins: Two‐dimensional laboratory models

Callot, Jean‐Paul; Grigné, Cécile; Geoffroy, Laurent; Brun, Jean‐Pierre

doi:10.1029/2000tc900030

Cited by 35 publications

(28 citation statements)

References 55 publications

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“…Gjallar Ridge) (Brekke et al, 2001;Ren et al, 2003). The emplacement of sub-crustal magmatism possibly triggered a pulse of lithospheric thinning due to strain localization of the deformation as suggested by both analogue (Callot et al, 2001; and numerical modeling (Yamasaki and Gernigon, 2009). Combined with the relative thermal effects of crustal intrusions, the enhanced crustal geothermal gradient, directly and/or indirectly initiated by the nascent magmatism, was locally enough to initiate hydrous anatexis of the pre-existing upper crustal litologies.…”

Section: Emplacement Modelmentioning

confidence: 99%

Pre-breakup magmatism on the Vøring Margin: Insight from new sub-basalt imaging and results from Ocean Drilling Program Hole 642E

et al. 2016

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Section: Emplacement Modelmentioning

confidence: 99%

Pre-breakup magmatism on the Vøring Margin: Insight from new sub-basalt imaging and results from Ocean Drilling Program Hole 642E

et al. 2016

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“…In addition to the 18-Myr time gap between the onset of spreading and the emplacement of the studied basalts, several lines of evidence suggest that they were erupted within an already rifted area, essentially similar to a nonvolcanic passive margin. Indeed, during the middle Permian the geological features of the Oman margin were not similar to those of typical volcanic passive margins [e.g., Callot et al, 2001;Menzies et al, 2002]. For instance, the width of the Hawasina Basin is estimated to be several hundred kilometers, and possibly even 500 km , which is much larger than commonly observed on volcanic margins.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

Middle Permian plume‐related magmatism of the Hawasina Nappes and the Arabian Platform: Implications on the evolution of the Neotethyan margin in Oman

et al. 2003

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Permian pillow basalts are commonly found in Oman either at the base of the Hawasina Nappes or within the Arabian Platform successions exposed in the Saih Hatat tectonic window. There is an ongoing debate on whether these lavas include normal mid‐oceanic ridge basalts (NMORB) witnessing the Permian opening of the Neotethys or if they are plume‐related magmas that are emplaced either on the Arabian Platform or on its thinned continental margin. We sampled these lavas from several paleontologically dated middle Permian sites. Four of them (Buday'ah, Rustaq, Al Ajal, and Wadi Wasit) are located within the Hawasina Nappes and are exposed as thrust slices overlain by the Samail Nappe, and one (Wadi Aday) is within the Arabian Platform units and is exposed in the Saih Hatat window. These lavas are associated with marine sediments deposited in environments ranging from proximal (Saih Hatat, Wadi Wasit, and base of the thrust pile of Al Ajal) to distal (Buday'ah, Rustaq, and top of the Al Ajal pile) with respect to the Arabian Platform. Major and trace element features of the basalts allow two groups to be recognized. Enriched high‐Ti basalts similar to alkali basalts from intracontinental traps, rifted continental zones, and oceanic islands are exposed in Wadi Aday, Wadi Wasit, and at the structural base of the Al Ajal pile. Moderately enriched to slightly depleted low‐Ti tholeiitic basalt magmas resembling the low‐Ti flood basalts and those from seaward dipping reflector sequences are represented in Wadi Al Hulw in Saih Hatat, Buday'ah, Rustaq, and at the top of the Al Ajal thrust pile. Both groups show distinct plume‐related trace element signatures, and they do not include typical NMORB. Although emplaced in shallow to deep submarine environments, these basalts provide no direct evidence for a Neotethyan seafloor‐spreading event in the Hawasina Basin. Instead, they were likely erupted through the crust of the already rifted and drowned Arabian continental margin. Thus, despite their characteristic plume‐related geochemical signatures, the middle Permian basalts from Oman were not likely emplaced during the evolution of a typical volcanic rifted margin. We suggest that they originated from a mantle plume which ascended beneath the Arabian passive margin well after the initiation of seafloor spreading of the Neotethys.

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“…7), highest strain rate and active faulting occur where the lithosphere is thinnest. Several modellings illustrate this effect and effectively prove that melted zones within the lithosphere can strongly control the localization of stretching and necking (Geoffroy et al 1998;Callot et al, 2002;Gac and Geoffroy, submitted). Ebinger and Casey (2001) draw the same conclusions, for the nascent volcanic margin observed in the northern part of the Ethiopian rift, that represent an excellent modern analogue of the outer Vøring Basin.…”

Section: Thermal Evolutionmentioning

confidence: 99%

A moderate melting model for the Vøring margin (Norway) based on structural observations and a thermo-kinematical modelling: Implication for the meaning of the lower crustal bodies

et al. 2006

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Development of volcanic passive margins: Two‐dimensional laboratory models

Cited by 35 publications

References 55 publications

Pre-breakup magmatism on the Vøring Margin: Insight from new sub-basalt imaging and results from Ocean Drilling Program Hole 642E

Pre-breakup magmatism on the Vøring Margin: Insight from new sub-basalt imaging and results from Ocean Drilling Program Hole 642E

Middle Permian plume‐related magmatism of the Hawasina Nappes and the Arabian Platform: Implications on the evolution of the Neotethyan margin in Oman

A moderate melting model for the Vøring margin (Norway) based on structural observations and a thermo-kinematical modelling: Implication for the meaning of the lower crustal bodies

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