Structure of a fossil ridge–transform intersection in the Troodos ophiolite

Macleod, Christopher; Allerton, Simon; Gass, I. G.; Xenophontos, C.

doi:10.1038/348717a0

Cited by 55 publications

(56 citation statements)

References 13 publications

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“…Steep faults dipping toward the ridge axis with back-tilted rotation of blocks within the upper crust were observed at the Atlantic ridge outside corner [40]. Therefore, rotations about a horizontal axis near the Solea graben indicate an OC location [20,23].…”

Section: The Inferred Rti Deformation In the Gabbro Suite And The Locmentioning

confidence: 94%

“…The rotation of the crest of the hills decreases to zero and they aligned with the regional trend far (20 km) from the transform faults. Therefore, rotations about a vertical axis near the Arakapas transform indicate an IC location [20,23]. Steep faults dipping toward the ridge axis with back-tilted rotation of blocks within the upper crust were observed at the Atlantic ridge outside corner [40].…”

Section: The Inferred Rti Deformation In the Gabbro Suite And The Locmentioning

confidence: 94%

“…Accordingly, the RTI is orthogonal under this interpretation. Still, the linkage between the Solea axis and the location of the fossil RTI suggested by Macleod et al [20] is not clear, especially considering the curving planform of the Solea graben as mapped by Abelson et al [25]. The curving axis would imply a curved, rather than rectangular RTI as suggested by Macleod et al [20].…”

Section: The Fossil Ridge-transform Intersection (Rti) Of the Troodosmentioning

confidence: 97%

“…Maximum deformation, with ~90° cumulative clockwise rotation, is evident close to the transform (i.e., sheeted dike trending E-W). The degree of rotation gradually declines with increasing distance from the Arakapas transform reaching zero 6 km to the north [20][21][22][23].…”

Section: Figurementioning

confidence: 98%

“…1) in which structural markers are much more subtle than, for example, dike trends in the upper crust. In order to extrapolate the Solea axis towards the Arakapas transform, Macleod et al [20] and Allerton and Vine [21] examined the sheeted dikes south of the plutonic complex, in the vicinity of the Arakapas transform. West of the village of Mandria MacLeod et al [20] have found a transition between domains of steeply dipping N-S trending dikes (i.e., location of OC, Fig.…”

Section: The Fossil Ridge-transform Intersection (Rti) Of the Troodosmentioning

confidence: 99%

See 4 more Smart Citations

The oceanic crust in 3D: Paleomagnetic reconstruction in the Troodos ophiolite gabbro

Granot

Abelson

Ron

et al. 2006

Earth and Planetary Science Letters

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Section: The Inferred Rti Deformation In the Gabbro Suite And The Locmentioning

confidence: 94%

Section: The Inferred Rti Deformation In the Gabbro Suite And The Locmentioning

confidence: 94%

Section: The Fossil Ridge-transform Intersection (Rti) Of the Troodosmentioning

confidence: 97%

Section: Figurementioning

confidence: 98%

Section: The Fossil Ridge-transform Intersection (Rti) Of the Troodosmentioning

confidence: 99%

See 3 more Smart Citations

The oceanic crust in 3D: Paleomagnetic reconstruction in the Troodos ophiolite gabbro

Granot

Abelson

Ron

et al. 2006

Earth and Planetary Science Letters

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An experimental investigation of dyke injection under regional extensional stress

Daniels

Menand

2015

JGR Solid Earth

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Dyke injection is a fundamental process of magma transport in the crust, occurring in all tectonic settings. The effect of extensional stress regimes on dyke injections is particularly important to understanding a wide spectrum of processes including continental rifting and volcanic activity. Yet dyke injection in extensional regimes has been relatively understudied. In addition, the effect of dyke-dyke interaction modifying the surrounding stress field and leading to dyke rotation about the vertical axis has not been addressed. We present the results from 23 laboratory analogue experiments investigating lateral dyke injections in a remote extensional stress field. This study is unique in that it addresses the effect of both extension and dyke-dyke interaction on the lateral propagation and rotation of dykes. The experiments study the interrelationship between successive lateral dyke injections by examining dyke injection thickness, injection spacing, injection orientation, extension, and structural relationship. A relationship between the rotation angle between two successive intrusions and the distance separating them under given extensional stress conditions is established. The rotation angle depends on two dimensionless numbers: the ratio of fluid overpressure of the first injection and remote tensile stress, and the ratio of the spacing between injections and the height of the first intrusion. The experiments show how the stress field is perturbed by an intrusion and how the remote stress field is locally relieved by this intrusion. The results show furthermore that measuring or estimating the rotation angles between successive intrusions within rift zones allows the spatial distribution of these intrusions to be estimated. In the case of the actively spreading Red Sea rift in Afar, Ethiopia, we find that the vast majority of the dykes are predicted to intrude within 10 km of each other and most frequently between 4 and 5 km, in good agreement with independent geophysical observations.

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Dynamics of intraoceanic subduction initiation: 2. Suprasubduction zone ophiolite formation and metamorphic sole exhumation in context of absolute plate motions

Hinsbergen

Peters

Maffione

et al. 2015

Geochem Geophys Geosyst

120

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Analyzing subduction initiation is key for understanding the coupling between plate tectonics and the underlying mantle. Here we focus on suprasubduction zone (SSZ) ophiolites and how their formation links to intraoceanic subduction initiation in an absolute plate motion frame. SSZ ophiolites form the majority of exposed oceanic lithosphere fragments and are widely recognized to have formed during intraoceanic subduction initiation. Structural, petrological, geochemical, and plate kinematic constraints on their kinematic evolution show that SSZ crust forms at fore-arc spreading centers at the expense of a mantle wedge, thereby flattening the nascent slab. This leads to the typical inverted pressure gradients found in metamorphic soles that form at the subduction plate contact below and during SSZ crust crystallization. Former spreading centers are preserved in forearcs when subduction initiates along transform faults or offridge oceanic detachments. We show how these are reactivated when subduction initiates in the absolute plate motion direction of the inverting weakness zone. Upon inception of slab pull due to, e.g., eclogitization, the sole is separated from the slab, remains welded to the thinned overriding plate lithosphere, and can become intruded by mafic dikes upon asthenospheric influx into the mantle wedge. We propound that most ophiolites thus formed under special geodynamic circumstances and may not be representative of normal oceanic crust. Our study highlights how far-field geodynamic processes and absolute plate motions may force intraoceanic subduction initiation as key toward advancing our understanding of the entire plate tectonic cycle.

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Structure of a fossil ridge–transform intersection in the Troodos ophiolite

Cited by 55 publications

References 13 publications

The oceanic crust in 3D: Paleomagnetic reconstruction in the Troodos ophiolite gabbro

The oceanic crust in 3D: Paleomagnetic reconstruction in the Troodos ophiolite gabbro

An experimental investigation of dyke injection under regional extensional stress

Dynamics of intraoceanic subduction initiation: 2. Suprasubduction zone ophiolite formation and metamorphic sole exhumation in context of absolute plate motions

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