Tectonic forces controlling the regional intraplate stress field in continental Australia: Results from new finite element modeling

Reynolds, Scott; Coblentz, David; Hillis, Richard R.

doi:10.1029/2001jb000408

Cited by 105 publications

(134 citation statements)

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“…However, finite element modeling has revealed that even the complicated stress pattern observed in Australia can be accurately reproduced from plate boundary forces and intraplate sources of stress (Coblentz et al, 1998;Reynolds et al, 2002). Hence, it is likely that the complicated stress pattern observed in Southeast Asia may be accurately modelled in future studies.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…However, localized sources of stress can have a significant impact on small-scale stress patterns (Tingay et al, 2005a;Heidbach et al, 2007). Detailed analysis of the forces controlling the plate-scale and small-scale stress fields can be successfully conducted by finite element modeling (for example, Coblentz and Sandiford, 1994;Coblentz and Richardson, 1996;Gölke and Coblentz, 1996;Reynolds et al, 2002). However, such…”

Section: Regional Stress Orientations In Southeast Asiamentioning

confidence: 99%

“…Early phases of the World Stress Map (WSM) and Australian Stress Map projects demonstrated that the first-order intraplate stress field is primarily the result of forces generated at plate boundaries, most importantly mid-ocean ridge 'push', subducting slab 'pull', trench 'suction' and resistance due to continental collision (Forsyth and Uyeda, 1975;Zoback, 1992;Reynolds et al, 2002). However, the Sunda plate, that encompasses much of Southeast Asia, is almost entirely surrounded by collisional and subduction zones and only has a very short and poorly developed spreading centre in the Andaman Sea (Figure 1; Bird, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Present-day stress field of Southeast Asia

et al. 2010

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It is now well established that ridge push forces provide a major control on the plate-scale stress field in most of the Earth's tectonic plates. However, the Sunda plate that comprises much of Southeast Asia is one of only two plates not bounded by a major spreading centre and thus provides an opportunity to evaluate other forces that control the intraplate stress field. The Cenozoic tectonic evolution of the Sunda plate is usually considered to be controlled by escape tectonics associated with India-Eurasia collision. However, the Sunda plate is bounded by a poorly understood and complex range of convergent and strike-slip zones and little is known about the effect of these other plate boundaries on the intraplate stress field in the region. We compile the first extensive stress dataset for Southeast Asia, A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTthe radiating stress patterns arising from the eastern Himalayan syntaxis. However, the present-day maximum horizontal stress is primarily oriented NW-SE in Borneo, a direction that may reflect plate-boundary forces or topographic stresses exerted by the central Borneo highlands. Furthermore, the South and Central Sumatra Basins exhibit a NE-SW maximum horizontal stress direction that is perpendicular to the Indo-Australian subduction front. Hence, the plate-scale stress field in Southeast Asia appears to be controlled by a combination of Himalayan orogeny-related deformation, forces related to subduction (primarily trench suction and collision) and intraplate sources of stress such as topography and basin geometry.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Regional Stress Orientations In Southeast Asiamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Present-day stress field of Southeast Asia

et al. 2010

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“…It has been shown that shallow processes influence both the magnitude and orientation of the lithospheric stresses. Among such processes the most important are the slab pull, ridge push, trench and continental collision (deformation) (Reynolds et al, 2002) as well as the 10 cratonic root resistance (Naliboff et al, 2012). Also, gravitational effects due to lateral density heterogeneities in the lithosphere and tractions from the mantle flow at the base of the moving plates play an important role.…”

Section: Introductionmentioning

confidence: 99%

Effects of upper mantle heterogeneities on lithospheric stress field and dynamic topography

Tutu¹,

Steinberger²,

Sobolev³

et al. 2017

Preprint

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Abstract. The orientation and tectonic regime of the observed crustal/lithospheric stress field contribute to our knowledge of different deformation processes occurring within the Earth's crust and lithosphere. In this study, we analyze the influence of the thermal and density structure of the upper mantle on the lithospheric stress field and topography. We use a 3D lithosphereasthenosphere numerical model with power-law rheology, coupled to a spectral mantle flow code at 300 km depth. Our results are validated against the World Stress Map 2016 and the observation-based residual topography. We derive the upper mantle 5 thermal structure from either a heat flow model combined with a sea floor age model (TM1) or a global S-wave velocity model (TM2). We show that lateral density heterogeneities in the upper 300 km have a limited influence on the modeled horizontal stress field as opposed to the resulting dynamic topography that appears more sensitive to such heterogeneities. There is hardly any difference between the stress orientation patterns predicted with and without consideration of the heterogeneities in the upper mantle density structure across North America, Australia, and North Africa. In contrast, we find that the dynamic 10 topography is to a greater extent controlled by the upper mantle density structure. After correction for the chemical depletion of continents, the TM2 model leads to a much better fit with the observed residual topography giving a correlation of 0.51 in continents, but this correction leads to no significant improvement in the resulting lithosphere stresses. In continental regions with abundant heat flow data such as, for instant, Western Europe, TM1 results in relatively a small angular misfits of 18.30

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“…Boldreel & Andersen 1993Lundin & Doré 2002;Stoker et al 2005). Studies of the origins of the present-day regional stress fields in the interiors of both the European (Gölke & Coblentz 1996) and Indo-Australasian plates (Reynolds et al 2002) using finite element analyses have shown that the state of stress at any point within the plate is a function of the net torques of all the plate boundary forces (Reynolds et al 2002). This suggests that the Neogene compressional deformation in the Irish Sea is a function of both Atlantic ridge-push forces and Alpine lithospheric shortening.…”

Section: /28-1mentioning

confidence: 99%