Pre-existing basement thrusts influence rifting in the Taranaki Basin, New Zealand

Siuda, Katherine; Magee, Craig; Bell, Rebecca; Jackson, Christopher; Collanega, Luca

doi:10.31223/osf.io/5e9q6

Cited by 2 publications

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“…Mechanically, they represent areas of structural weakness that can become reactivated and allow rifts to propagate preferentially along them (e.g., Daly et al, 1989). Several studies have documented the relationships between rift faults and the preexisting basement fabrics (e.g., Corti, 2012;Corti et al, 2007;Katumwehe et al, 2015;Kinabo et al, 2007Kinabo et al, , 2008Kolawole et al, 2018;Lemna et al, 2018;Morley, 1999aMorley, , 2010Morley et al, 2004;Phillips et al, 2016;Siuda et al, 2018;Taylor et al, 2011;Wheeler & Karson, 1989). Further, recent studies have assessed the three-dimensional relationship between preexisting basement thrusts and extensional structures, revealing the control of the preexisting basement structures on the nucleation and strain distribution along the normal faults (e.g., Collanega et al, 2018;Kolawole et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Controls of Basement Fabric on the Linkage of Rift Segments

et al. 2019

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The Rukwa and North Malawi Rift Segments (RNMRS) both define a major rift‐oblique segment of the East African Rift System and are often regarded as discrete rifts due to the presence of the uplifted Mbozi block between them. Here we investigate the influence of basement fabrics on the coupling and linkage of border faults across an interrift transfer zone between discrete juvenile rift segments. We utilized satellite digital elevation model to investigate the morphological architecture of the rift domains and aeromagnetic data to assess the relationships (plan view) between the rift structures and the prerift basement fabrics. Our results show that the present‐day morphology of the RNMRS is characterized by along‐rift alternation of rift shoulder polarity, characteristic of coupled rift segments. Interpretation of filtered aeromagnetic maps along the boundaries of the RNMRS reveals striking alignment of the rift‐bounding faults with colinear NW‐SE trending preexisting basement fabrics. We find that rift coupling along the NE boundary of the Mbozi transfer zone is accommodated by fault‐assisted magma plumbing, whereas coupling along the SW boundary is accommodated by strike‐slip and oblique‐normal faulting that reactivated the Proterozoic Mughese shear zone, within the collisional boundary between the Tanzania craton and the Bangweulu cratonic block. Further, we show how the configuration of the basement fabrics may influence the formation of rift bifurcation across inter‐rift transfer zones. We suggest that the structural connectivity of the boundary faults along the RNMRS and their alignment with colinear basement fabrics demonstrate the influence of structural inheritance on the amalgamation of approaching rift segments.

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Section: Introductionmentioning

confidence: 99%

Controls of Basement Fabric on the Linkage of Rift Segments

et al. 2019

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“…Mechanically, they represent areas of structural weakness that can become reactivated and allow rifts to propagate preferentially along them (e.g., Daly et al, 1989). Several studies have documented the relationships between rift faults and the pre-existing basement fabrics (e.g., Wheeler and Karson, 1989;Kinabo et al, 2007Kinabo et al, , 2008Taylor et al, 2011;Phillips et al, 2016;Kolawole et al, 2018;Siuda et al, 2018). Further, recent studies have assessed the 3-dimensional relationship between pre-existing basement thrusts and intra-rift normal faults, revealing the control of the pre-existing basement structures on the nucleation and strain distribution along the normal faults (e.g., Collanega et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Controls of basement fabric on rift coupling and development of normal fault geometries: Insights from the Rukwa – North Malawi Rift

Heilman¹,

Kolawole²,

Atekwana³

et al. 2018

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The Rukwa Rift and North Malawi Rift Segments (RNMRS) both define a major rift-oblique segment of the East African Rift System (EARS), and although the two young rifts show colinear approaching geometries, they are often regarded as discrete rifts due to the presence of the intervening Mbozi Block uplift located in-between. This problem has been complicated by the dominance of the Rungwe volcanic features along the northeastern boundary of the Mbozi Block and lack of distinct normal faults along the southwestern boundary of the block. Here, we investigate the coupling of discrete rift segments during the onset of continental rifting, modulated by the control of pre-existing basement fabrics on the development of the border fault geometries and linkage across the intra-rift transfer zone. We utilized the Shuttle Radar Topography Mission Digital Elevation Models (SRTM-DEM) to investigate the morphological architecture of the rift domains; and aeromagnetic data and SRTM-DEM to assess the relationships between the rift structures and the pre-existing basement fabric (in plan-view). Our results show that the present-day morphology of the RNMRS is characterized by along-rift alternation of rift shoulder polarity, characteristic of coupled rift segments. Careful interpretation of filtered aeromagnetic maps along the northeastern and southwestern boundaries of the RNMRS reveal striking alignment of the rift-bounding faults with colinear NW-SE-trending pre-existing basement fabrics. We find that rift coupling along the northeastern boundary of the Mbozi Block transfer zone is accommodated by magmatism utilizing pre-existing fault systems, whereas, coupling along the southwestern boundary is accommodated by a new-found dextral strike-slip fault. Additionally, we show how the configuration of the pre-existing basement fabrics may influence the development of rectilinear or curvilinear normal fault geometries (plan-view) along the rifts, and the formation of basin-scale rift bifurcation around basement inter-rift transfer zones. In summary, we suggest that the structural continuation of the boundary faults along the RNMRS, and their alignment with colinear basement fabrics demonstrate the influence of structural inheritance on the coupling and amalgamation of approaching rift segments.

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Pre-existing basement thrusts influence rifting in the Taranaki Basin, New Zealand

Abstract: 16Discrete structures (e.g. faults) or pervasive fabrics (e.g. foliation), which may occur in pre-

Cited by 2 publications

References 1 publication

Controls of Basement Fabric on the Linkage of Rift Segments

Controls of Basement Fabric on the Linkage of Rift Segments

Controls of basement fabric on rift coupling and development of normal fault geometries: Insights from the Rukwa – North Malawi Rift

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