Recognition of syn-convergence extension in accretionary wedges with examples from the Calabrian Arc and the Eastern Alps

Wallis, Simon; Platt, J. P.; Knott, Steven D.

doi:10.2475/ajs.293.5.463

Cited by 220 publications

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“…To calculate the kinematic vorticity number (W k ), the following equation (Wallis, 1992;Wallis et al, 1993;Sarkarinejad, 2007) has been used:…”

Section: Kinematic Vorticity Numbermentioning

confidence: 99%

Quantitative finite strain analysis of high-grade metamorphic rocks within the Mae Ping shear zone, western Thailand

Ponmanee¹,

Kanjanapayont²,

Grasemann³

et al. 2016

AJES

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The NW trending Mae Ping shear zone exposes high-grade metamorphic rocks, the so called Lansang gneiss in the Tak region, western Thailand. The lithologies within the strike-slip zone mainly consist of orthogneisses and paragneisses. Using Fry's method for 2-dimensional strain analysis we find that the averaged finite strain ratio (R s ) of the XY-plane is R s = 1.35-1.69. Based on the kinematic vorticity analysis of the mylonitic gneisses in the shear zone, the kinematic vorticity number is W k = 0.8-1.0 with an average of W k = 0.95. The results imply that the homogeneously deforming rocks within the Mae Ping shear zone have a strong simple shear component with a minor pure shear contribution of about 15 %. The kinematic indictors from both outcrop and micro scopic scales indicate a sinistral strike-slip shear sense. We conclude that the Mae Ping shear zone accommodated crustal scale sinistral transpression.

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“…To calculate the kinematic vorticity number (W k ), the following equation (Wallis, 1992;Wallis et al, 1993;Sarkarinejad, 2007) has been used:…”

Section: Kinematic Vorticity Numbermentioning

confidence: 99%

Quantitative finite strain analysis of high-grade metamorphic rocks within the Mae Ping shear zone, western Thailand

Ponmanee¹,

Kanjanapayont²,

Grasemann³

et al. 2016

AJES

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“…-de for ma tion within the wedge may in clude large amounts of hor i zon tal ex ten sion as well as short en ing; -extensional de for ma tion may take place while plate con ver gence is con tin u ing and be fore con ti nen tal col lision (Wallis et al, 1993). Wedge thick en ing may be ana lysed by tak ing into con sider ation the sed i men tary sig nal of the foredeep de pos its, in terms of the dis tri bu tion of fa cies and thick ness.…”

Section: Discussionmentioning

confidence: 99%

“…A com mon fea ture of the Al pine orogens in the cen tral Med i ter ranean re gion, is in geodynamic evo lu tion dur ing the Ce no zoic, is the mi gra tion of the subduction trench con com i tant with progres sive for ward prop a ga tion of the fron tal thrusts in the foreland do main and crustal ex ten sion in the back-arc re gions (Alvarez et al, 1974;Dewey et al, 1989;Jolivet and Faccenna, 2000). The con com i tance of ex ten sion and short en ing set tings has been doc u mented by in te grat ing struc tural and pet ro log i cal data com ing from high pres sure meta mor phic units pres ently ex posed in the hin ter land re gions of the Calabria-Peloritani Arc (Wallis et al, 1993;Rossetti et al, 2004;Heymes et al, 2010).…”

Section: Main Geological Outlinesmentioning

confidence: 99%

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Tectonic evolution of the Sicilian Thrust System (central Mediterranean)

Napoli

Nigro

Renda

et al. 2012

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. (2012) -Tec tonic evo lu tion of the Si cil ian Thrust Sys tem (cen tral Med i ter ranean). Geol. Quart., 56 (4): 579-600, doi: 10.7306/gq.1043The Si cil ian Thrust Sys tem (STS) is a south-verg ing (Af rica-verg ing) fold-and-thrust belt in clud ing a Me so zoic-Paleogene sed i men tary se quence. This thrust stack owes its or i gin to the de for ma tion of pre-orogenic strata de pos ited in dif fer ent palaeogeographic do mains belong ing to pas sive mar gins of the Af ri can plate. The STS was de formed dur ing the Neo gene, fol low ing the clo sure of the Tethys Ocean and the con ti nen tal col li sion be tween the Sardo-Corso Block and the north Af rica mar gins. The thrust pile was de tached from the un derly ing base ment dur ing the Mio cene-Pleis to cene. The re gional-scale struc tural set ting rec og nized al lows us to re con struct the tec tonic evo lu tion of the STS as fol lows: I -piggy-back thrust ing from the Late Oligocene to the Langhian, in duc ing the build ing of the In ner Sicil ian Chain (ISC); II -piggy-back thrust ing from the Langhian to the Tortonian, in duc ing the for ma tion of the Mid dle Si cil ian Chain (MSC); III -gen er al ized extensional de for ma tion in the chain-foredeep-fore land sys tem from the Tortonian to the Early Plio cene; IV -a new on set of piggy-back thrust ing af ter the Early Plio cene al lowed the build ing of the Outer Si cil ian Chain and out-of-se quence thrust ing in the pre vi ously de vel oped ISC and MSC.

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“…Platt 1986). Extensional basins are expected to form above these faults (Wallis et al 1993). Examples for such basins that formed at convergent margins are the Recent forearc basins of the Hikurangi margin in the North Island of New Zealand (Walcott 1987;Cashman & Kelsey 1990).…”

Section: Syn-orogenic Versus Post-orogenic Extensionmentioning

confidence: 99%

Tectonic significance of Cretaceous bivergent extensional shear zones in the Torlesse accretionary wedge, central Otago Schist, New Zealand

Deckert

Ring

Mortimer

2002

New Zealand Journal of Geology and Geophysics

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We describe two shear zones in the Otago Schist of the Torlesse accretionary wedge, South Island, New Zealand: the north-dipping Rise-and-Shine Shear Zone (RSSZ) and the south-dipping Cromwell Gorge Shear Zone (CGSZ). Kinematic indicators (shear bands and asymmetric folds) indicate top-north movement for the RSSZ and topsouth transport for the CGSZ. Back rotation of the shear zones into their Late Cretaceous orientation and consideration of the relationship of the shear zones to arching of the Otago Schist show that both shear zones are extensional. Offset of textural zones suggests up to 15 km of dip-slip displacement on the RSSZ and probably a similar amount of slip for the CGSZ. We speculate that the goldmineralised RSSZ may be the western continuation of the late Mesozoic gold-bearing Hyde-Macraes Shear Zone in eastern Otago, forming a c. 100 km long extensional shear zone on the northern flank of the Otago Schist. Age constraints suggest that shear zone formation took place between 135 and 105 Ma. The shear zones aided the final exhumation of the deeper parts of the Otago Schist. We discuss whether normal shearing is related to syn-orogenic supercritical tapering of the Torlesse wedge, or due to postorogenic New Zealand-wide Albian rifting.

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Recognition of syn-convergence extension in accretionary wedges with examples from the Calabrian Arc and the Eastern Alps

Cited by 220 publications

References 0 publications

Quantitative finite strain analysis of high-grade metamorphic rocks within the Mae Ping shear zone, western Thailand

Quantitative finite strain analysis of high-grade metamorphic rocks within the Mae Ping shear zone, western Thailand

Tectonic evolution of the Sicilian Thrust System (central Mediterranean)

Tectonic significance of Cretaceous bivergent extensional shear zones in the Torlesse accretionary wedge, central Otago Schist, New Zealand

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