Localisation of deformation in the thermal contrast at a granite batholith margin, New Zealand

Scott, James M.; Borcovsky, Damien; Palin, J. Michael; Toy, Virginia

doi:10.1016/j.jsg.2013.07.013

Cited by 3 publications

(2 citation statements)

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“…Sense of shear indicators in the Grebe‐IC and GSSZs are abundant and described elsewhere (Allibone & Tulloch, 2008; Blatchford et al., 2020; N. R. Daczko et al., 2001; Daczko et al., 2002c; Daczko et al., 2002b; Klepeis & King, 2009; Klepeis et al., 2004; Marcotte et al., 2005; McGinn et al., 2020; Scott et al., 2011, 2014). We used the results of kinematic analyses cited in these publications, which follow excepted methods of shear zone analysis (e.g., Díaz‐Azpiroz et al.…”

Section: Methodsmentioning

confidence: 99%

“…In northern Fiordland, it produced the Indecision Creek shear zone (Buriticá et al., 2019; Klepeis & King, 2009; Klepeis et al., 2004; Marcotte et al., 2005), the Mt Daniel shear zone (Bhattacharya et al., 2018; Klepeis et al., 2004), and the Pembroke Thrust (N. R. Daczko et al., 2001; Klepeis & King, 2009). In central and southern Fiordland, it produced the Grebe (Buriticá et al., 2019; McGinn et al., 2020; Negrini et al., 2018; Scott et al., 2011, 2014), George Sound (Allibone, Jongens, Turnbull, et al., 2009; Klepeis et al., 2004), Straight River (King et al., 2008), and Misty (Blatchford et al., 2020) shear zones. Mid‐crustal deformation also formed the South Adams Burn (SAB) (Blatchford et al., 2020) and Caswell (Daczko et al., 2002b) thrust belts, and, in the lower crust, the Breaksea and Malaspina Domes (Betka & Klepeis, 2013; Klepeis et al., 2016; Miranda and Klepeis, 2016).…”

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

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The Initiation and Growth of Transpressional Shear Zones Through Continental Arc Lithosphere, Southwest New Zealand

et al. 2022

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Structural analyses combined with new U‐Pb zircon and titanite geochronology show how two Early Cretaceous transpressional shear zones initiated and grew through a nearly complete section of continental arc crust during oblique convergence. Both shear zones reactivated Carboniferous faults that penetrated the upper mantle below Zealandia's Median Batholith but show opposite growth patterns and dissimilar relationships with respect to arc magmatism. The Grebe‐Indecision Creek shear zone was magma‐starved and first reactivated at ∼136 Ma as an oblique‐reverse fault, along which an outboard batholith partially subducted beneath Gondwana. This system nucleated at or above ∼20 km depth and propagated downward at 2–3 mm yr−1, accumulating at least 35–45 km of horizontal (arc‐normal) shortening by ∼124 Ma. In contrast, the magma‐rich George Sound shear zone first reactivated in the lower crust (∼55 km depth) at ∼124 Ma and grew upward at ∼3 mm yr−1, reaching the upper crust by ∼110 Ma. In this latter system, magmatism influenced shear zone architecture and drove its growth while subduction and oblique convergence ended. As magma entered the roots of the system and began to solidify, deformation was driven out of the lower crust and into the middle crust where the system widened by a factor of three when fold‐thrust belts formed on either side of a steep, central transpressional shear zone. This study illustrates how the reactivation of structural weaknesses localizes deformation at all depths in the lithosphere and shows how magma‐deformation feedbacks influence shear zone connectivity and built a batholith from the bottom up.

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