Incremental pluton emplacement during inclined transpression

Zibra, I.; Smithies, R. Hugh; Wingate, Michael T.D.; Kirkland, Christopher L.

doi:10.1016/j.tecto.2014.03.020

Cited by 29 publications

(33 citation statements)

References 47 publications

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“…Magmas then ascend to a specific emplacement level where they finally spread laterally to form a sheeted intrusive unit. When the conditions for partial melting are reached in another source the process starts again, but the level that the ascending magmas reach is influenced by the presence of the preexisting granitoid bodies, so the incoming magma either pools beneath the accreting batholith (e.g., Coleman et al, 2004;De Saint Blanquat et al, 2001;Michel et al, 2008) or cuts through all the older units to pool at the batholith roof (e.g., this study; Zak et al, 2013;Zibra et al, 2014). It does not pool within older granite units.…”

Section: Accepted Manuscriptmentioning

confidence: 79%

Timescales and mechanisms of batholith construction: Constraints from zircon oxygen isotopes and geochronology of the late Variscan Serre Batholith (Calabria, southern Italy)

Fiannacca

Williams

Cirrincione

2017

Lithos

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Section: Accepted Manuscriptmentioning

confidence: 79%

Timescales and mechanisms of batholith construction: Constraints from zircon oxygen isotopes and geochronology of the late Variscan Serre Batholith (Calabria, southern Italy)

Fiannacca

Williams

Cirrincione

2017

Lithos

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“…Important studies of granitic rocks in transpressional orogens indicate that tectonics may act as fundamental controls on the ascent and emplacement of the granitic rocks (de Saint Blanquat et al, ; Hutton, , ; Hutton & Reavy, ; McCaffrey, ; Saint Blanquat et al, ). Syntectonic granite emplacements in broadly transpressive shear zones or along terrane boundaries have been reported from different parts of world and of diverse age (Crawford et al, ; D'Lemos et al, ; Guineberteau et al, ; Hutton, , , , , ; Hutton et al, ; Hutton & Reavy, ; Ingram & Hutton, ; Karlstrom, ; Klepeis & Crawford, ; McCaffrey, , ; Nummer et al, ; Reavy, ; Tikoff & Blanquat, ; Zibra et al, ). The mechanism of granite emplacement in these shear zones or terrane boundaries largely depends on the interaction between the ambient tectonic forces and the natural magma buoyancy (Hutton, ).…”

Section: Introductionmentioning

confidence: 99%

Mid‐Neoproterozoic Tectonics of Northwestern India: Evidence of Stitching Pluton along 810 Ma Phulad Shear Zone

et al. 2020

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In northwestern India, Phulad Shear Zone (PSZ,~810 Ma) demarcates the boundary between South Delhi Fold Belt to the east and Marwar craton to the west. This shear zone has regional NE-SW trend with small bends of N-S orientations. PSZ is characterized by steep southeasterly dipping mylonitic foliation with steep oblique stretching lineation. The PSZ has developed in a ductile transpression with top-to-the-NNW reverse sense of movement associated with a component of sinistral-slip movement on horizontal section. The 200 by 6 km porphyritic Phulad granite occurs along and across the PSZ, and it is variably deformed. Phulad granite shows evidence of magmatic foliation with preservation of parallel alignment of euhedral feldspars phenocrysts and microgranitoid enclaves. The feldspar phenocrysts show simple twin interfaces parallel to the direction of elongation. This granite also shows development of solid-state foliation parallel to this magmatic foliation. Detailed study of structural elements suggests that Phulad granite has formed during the regional deformation in the country rock shear zone prior to its complete crystallization. Our data indicate that the releasing bends of N-S orientation within the PSZ have provided the space required for emplacement of Phulad granite in a transpressional regime. EPMA U-Pb-Th monazite and U-Pb LA-ICP-MS zircon ages in Phulad granite indicate a magmatic age of 819.1 ± 4 and 818 ± 18 Ma, respectively. PSZ represents the suture along which Marwar craton accreted with remaining India to form the Greater India landmass. The present study suggests that Phulad granite acted as a stitching pluton during this suturing along PSZ at 810-820 Ma.

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“…The geometry visible in the field likely results from the combined effect of (i) overall listric geometry of main structures in the area (Figures b, b, and ) and (ii) steepening of the existing structures induced by a younger event of E‐W horizontal shortening (D 2 ), which produced the subvertical crenulation cleavage (S 2 ). It is likely that the local D 2 deformation event occurred in the ~2680–2660 Ma time span, during the peak of tectonic activity along the adjacent Cundimurra Shear Zone (Figures a and ) [ Zibra et al ., ]. Importantly, our mesostructural and microstructural data indicate that the D 2 fabric did not pervasively overprint the earlier S HT and S MYL fabric related to the emplacement of the Yarraquin pluton.…”

Section: Discussionmentioning

confidence: 97%

“…[] and Zibra et al . [, ]. (b) Geological cross section through the central part of the Murchison Domain, along the western portion of the seismic section Yu1.…”

Section: Unconformities In the Youanmi Terranementioning

confidence: 99%

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The ~2730 Ma onset of the Neoarchean Yilgarn Orogeny

et al. 2017

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The timing of the onset of an orogeny is commonly constrained indirectly, because early orogenic structures are rarely exposed or are overprinted. Establishing the onset of an Archean orogeny is considerably more challenging, because of the more fragmented geological record and the general lack of consensus about Archean geodynamics. We combine existing tectonostratigraphic data with new structural and geophysical data sets to establish the onset of the Neoarchean Yilgarn Orogeny (Yilgarn Craton, Western Australia). We show that the surface of the ~2960–2750 Ma deep‐marine Yilgarn greenstone sequence was uplifted, eroded, and unconformably overlain by an ~2730 Ma, syntectonic clastic sequence, deposited in shallow marine to subaerial conditions, and derived from the erosion of the underlying greenstones. This ~2730 Ma regional unconformity predates the oldest known Yilgarn structures; therefore, its tectonic significance is so far unknown. At around the same time, at deeper crustal levels, the ~2728 Ma Yarraquin pluton was being emplaced along an active, large‐scale shear zone network. Our mesostructural and microstructural analysis shows that the bulk of the fabric in the granite and its country rocks developed during pluton emplacement and was largely assisted by magma‐present shearing. Overall, these structures reflect an important event of synemplacement crustal shortening. The regional unconformity and the syndeformational emplacement of the Yarraquin pluton are both expressions of an ~2730 Ma regional deformation event associated with significant crustal thickening, marking the onset of the Neoarchean Yilgarn Orogeny.

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Incremental pluton emplacement during inclined transpression

Cited by 29 publications

References 47 publications

Timescales and mechanisms of batholith construction: Constraints from zircon oxygen isotopes and geochronology of the late Variscan Serre Batholith (Calabria, southern Italy)

Timescales and mechanisms of batholith construction: Constraints from zircon oxygen isotopes and geochronology of the late Variscan Serre Batholith (Calabria, southern Italy)

Mid‐Neoproterozoic Tectonics of Northwestern India: Evidence of Stitching Pluton along 810 Ma Phulad Shear Zone

The ~2730 Ma onset of the Neoarchean Yilgarn Orogeny

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