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Transition from continental collision to tectonic escape? A geophysical perspective on lateral expansion of the northern Tibetan Plateau
Earth, Planets and Space volume 66, Article number: 10 (2014)
A number of tectonic models have been proposed for the Tibetan Plateau, which origin, however, remains poorly understood. In this study, investigations of the shear wave velocity (Vs) and density (ρ) structures of the crust and upper mantle evidenced three remarkable features: (1) There are variations in Vs and ρ of the metasomatic mantle wedge in the hanging wall of the subduction beneath different tectonic blocks of Tibet, which may be inferred as related to the dehydration of the downgoing slab. (2) Sections depicting gravitational potential energy suggest that the subducted lithosphere is less dense than the ambient rocks, and thus, being buoyant, it cannot be driven by gravitational slab pull. The subduction process can be inferred by the faster SW-ward motion of Eurasia relative to India as indicated by the plate motions relative to the mantle. An opposite NE-ward mantle flow can be inferred beneath the Himalaya system, deviating E and SE-ward toward China along the tectonic equator. (3) The variation in the thickness of the metasomatic mantle wedge suggests that the leading edge of the subducting Indian slab reaches the Bangoin-Nujiang suture (BNS), and the metasomatic mantle wedge overlaps with a region with poor Sn-wave propagation in north Tibet. The metasomatic layer, north of the BNS, deforms in the E-W direction to accommodate lithosphere shortening in south Tibet.
The Tibetan Plateau is the highest (with an average altitude of 4,000 m) and largest (with an area of about 2.5 Mkm2) plateau on the earth (Yin and Harrison 2000; England and Houseman 1988). The crustal thickening and uplift history of the Tibetan Plateau is fairly well understood (due to the efforts of multi-disciplinary international programs conducted during the last century) as its crustal thickness is twice the normal crustal thickness and it has shown uplift since the early Cenozoic time (Hirn et al. 1984; Dewey et al. 1988; Nelson et al. 1996; Searle 1996; Zhao et al. 2001; Kind et al. 2002; Shapiro et al. 2004; Andronicos et al. 2007; Nábělek et al. 2009; Kind and Yuan 2010; Carosi et al. 2013; and references therein). However, the plateau's growth mechanism is still unclear (Tapponnier et al. 2001) despite the proposal of the tectonic escape and lower crustal flow models to explain the plateau growth (Royden et al. 1997; Beaumont et al. 2001,2004). GPS measurements show a N-S convergence rate across the plateau of 1 to 2 cm/yr, and a W-E extension rate of about 1 to 2 cm/yr (Gan et al. 2007). The mechanism producing such a tectonic system transition from N-S convergence (south of the BNS) to W-E escape (north of the BNS) (Figure 1) is still unknown. Tectonic escape and gravitational collapse have been proposed to explain the mechanism underlying this transition (Peltzer and Tapponnier 1988; Peltzer and Saucier 1996; Burchfiel and Royden 1985; Coleman and Hodges 1995). However, gravitational collapse could only explain the temporal tectonic system transition from compression to extension, but it fails to explain the tectonic transition across the BNS. Moreover, the tectonic escape mechanism still does not consider the constraints arising from the deep structure of the crust and upper mantle, and the net rotation of the lithosphere. The S-wave velocity (Vs) and density (ρ) can aid in the understanding of the thermal and compositional contribution to the deformation process. Here, we incorporate both the Vs structure from surface wave tomography and ρ structure from gravity inversion to the depth of 350 km, and we obtain the gravitational potential energy of the plateau (Zhang et al. 2007; Zhang 2010; Zhang et al. 2014). Our results, which are the outcome of a specific synthesis based on the review paper by Zhang et al. (2014), suggest that the study of the SW-ward decoupling of the lithosphere relative to the mantle in the framework of the net rotation, also called "westward" drift of the lithosphere (Crespi et al. 2007) may contribute to the understanding of the geodynamics of the study area. A relative NE-ward mantle flow sustains the Indian slab and the overlying orogen. We also discuss the dehydration of the downgoing slab and the metasomatism of the mantle wedge, which may enhance decoupling of the overlying plate. Further, (we speculate that) the dehydration provides a source to melt the underlying lithospheric mantle to strongly attenuate Sn propagation.
Structural modeling from seismological tomography and gravity inversion
Based on the Rayleigh wave dispersion analysis, Zhang (2010) studied the three-dimensional (3D) velocity structure of the lithosphere-asthenosphere system (including that of the crust) in the Qinghai-Tibet Plateau and its adjacent areas (see also Zhang et al. 2014). With the purpose of constructing a robust inversion of the data, we used the program library GRAV3D, which is a suite of algorithms for inverting gravity data gathered over a 3D construction of the earth (Li and Oldenburg 1996,1998). The subsurface volume is modeled as a set of cuboidal elements each with ρ contrast. The inverse problem involves estimating the ρ contrasts of all the cuboidal elements based upon the available measurements of the Bouguer anomalies, and the inverse problem is solved as an optimization problem with the simultaneous goals of (1) minimizing the objective function on the model and (2) generating synthetic data that match observations to within a degree of misfit consistent with the statistics of the available data. The definition of length scales for smoothness controls the degree to which either of these two goals dominates. This is a crucial step that allows the user to incorporate a priori geophysical or geological information into the inversion. Explicit a priori information may also take the form of the upper and lower bounds on the ρ contrast in any element.
This approach has been extensively applied to upper crustal problems; however, applications to the lower crust and upper mantle have been limited (e.g., Brandmayr et al. 2011; Welford and Hall 2007; Welford et al. 2010). Refined mesh design and sensible regularization procedures permit reasonable resolution of the Moho surface, whilst allowing variations within the crust and mantle to be modeled as part of the same procedure (Welford and Hall 2007; Welford et al. 2010). The full 3D nature of this approach, along with the requirement of a large number of cells in the vertical direction, means that this method is more computationally demanding compared to other methods. Therefore, it is natural to use the reliable part of the crustal inversion as a constraint for the inversion involving the mantle down to 350 km (e.g., see Mueller and Panza 1986). To obtain the 3D ρ structure, we first constructed an a priori ρ model by using a literature conversion relation between Vs and ρ (Feng et al. 1986; Zhao et al. 2004; Deng et al. 2013) for the crust and PREM model (Dziewonski and Anderson 1981) for the upper mantle to a depth of 350 km. Subsequently, we applied a perturbation to the model in order to not only match the observed Bouguer gravity, but also to match the range of ρ since we use the range of Vs as the limiting condition (the Vs model is defined with its uncertainty range).
The Bouguer gravity data (Figure 2) is obtained from the EGM2008 (Pavlis et al. 2012), which provides a 2.5′ × 2.5′ grid on both land and ocean. The EGM2008 is formed by merging terrestrial, altimetry-derived, and airborne gravity data, wherein the data standard deviations are less than 10 mGal (Pavlis et al. 2008). Most of Tibet has a negative Bouguer anomaly (up to -600 mGal). The Tarim and Yangtze cratons have negative Bouguer anomalies, although smaller in absolute value than that of Tibet, and the anomaly in the Indian Craton is slightly positive.
Next, we discuss the ρ and Vs structures across the main tectonic blocks in the Tibetan Plateau. Figure 3 shows the spatial distribution of the Vs structure along seven sections, A-A′, B-B′, C-C′, D-D′, E-E′, F-F′ and G-G′, partly reproducing the results by Zhang et al. (2014), which have been extended here for an optimal illustration of the process from continental collision to tectonic escape. These sections are trending NE-SW; such a choice is in agreement not only with the principle to consider sections orthogonal to the main features, but it also follows the trend of the tectonic equator (TE) and of the TE-perturbed (Panza et al. 2010). The TE represents the tectonic mainstream, starting from the Pacific motion direction and linking all the other relative motions in a global circuit using first-order tectonic features such as the East Pacific Rise, the Atlantic rift, the Red Sea, the Indian Ocean rift for the rift zones, and the west Pacific subduction, the Andean subduction, and the Zagros-Himalayas subduction for convergent margins (Crespi et al. 2007). The TE is the great circle along which plates move over the earth's surface with the fastest mean angular velocity toward the west relative to the mantle (Crespi et al. 2007). Consistently, with the present-day Vs resolution, the TE-perturbed (which is not a great circle) describes the trajectory along which a global circuit, formed by a ubiquitous low-velocity zone (LVZ) about 1,000-km wide and about 100-km thick, occurs in the asthenosphere, wherein the most mobile mantle LVZ is located. The existence of a continuous global flow within the earth is thus confirmed by the existence of the TE-perturbed (Panza et al. 2010).
In all the sections considered, the upper part with Vs < 4.0 km/s and density < 2.90 g/cm3 is interpreted as the crust. The portion underlying the crust, with Vs values in the range from 4.4 to 4.65 km/s and density in the range from 3.2 to 3.37 g/cm3 is interpreted as the mantle lid, and the portion with Vs < 4.5 km/s and density 3.35 to 3.45 g/cm3 underlying the mantle lid is interpreted as the LVZ at the top of the asthenosphere. In the hanging wall of the subduction zone, within the LVZ, the portion with Vs < 4.45 km/s is interpreted as the metasomatic mantle wedge, wherein the fluids delivered by the slab contribute to decrease in rigidity (Doglioni et al. 2009). With these definitions, we constructed the conceptual sections with the red lines in Figures 3b,c,d,e,f,g,h, 4a,b,c,d,e,f,g and white lines in Figure 6a,b,c,d,e,f,g.
In section A-A′ (Figure 3b), the crust thickens gradually from about 40 km south of the Main Boundary Thrust (MBT) to about 80 km beneath the boundary between Tibet and the Tarim Basin. A very interesting feature is the thinning of the asthenosphere layer from about 80 to 90 km south of the Jinshajiang suture (abbreviated as JS in Figure 2 and hereafter), while, northward, the metasomatic lid appears and thickens up to 100 km beneath the north segment of the section.
Along section B-B′ (in Figure 3c), the crust and mantle structures are similar to those seen in section A-A′. The major difference between these two sections is the Moho depth, as beneath JS, an abrupt change appears in the Moho depth (Figure 3c).
Along section C-C′ (Figure 3d), the pattern of the crustal thickness is very different from that along sections A-A′ and B-B′ since the crustal thickness is relatively constant between the IYS and the north of the JS (Figure 3d). Along C-C′, the asthenosphere thins northward at the IYS while it exhibits a constant thickness to the south, and the metasomatic lid (and mantle wedge) begins to exist between the BNS and JS (the boundary between the south and north sections of the Qiangtang Block). The crustal structure beneath section D-D′ is similar to that of section C-C′, but the metasomatic lid appears south of the BNS in section D-D′ (Figure 3e). Along section E-E′ (Figure 3f), south of the JS, an abrupt change appears in the Moho depth, and the metasomatic lid begins to appear beneath the boundary between south and north Qiangtang. Along section F-F′ (Figure 3g), the abrupt change appears in the Moho depth beneath the boundary between the southern and northern sections of the Qiangtang Block, and the size of the metasomatic lid is significantly reduced with respect to that shown in the previous sections. A similar situation is seen along section G-G′ (Figure 3h), even if the metasomatic lid has almost ceased to exist (Figure 3h).
Figure 4 shows distinctive patterns in the density differences between the south and north sections of the BNS. Along profiles A-A′ (Figure 4a) and B-B′ (Figure 4b), ρ ranges from 2.4 to 2.9 g/cm3 in the crust, and the layer with ρ in the range of 2.8 to 2.9 g/cm3 thickens to about 70 km to the north (to about 30°N). These results may be consistent with the speculation that the crust of the Indian Plate penetrated the whole of the Tibetan Plateau in west Tibet (Li et al. 2008; Zhou and Murphy 2005). Along transects C-C′ (Figure 4c), D-D′ (Figure 4d), and (E-E′) (Figure 4e), we clearly observe that the convergence between the Indian and Eurasian plates thickens the crust. These results suggest that the leading edge of the injected Indian crust may be located along the BNS in east Tibet (Zhang et al. 2011).
Figure 5 illustrates the misfit between the observed and the computed Bouguer gravity anomalies along the seven profiles. The misfit is within 40 mGal beneath most transects. (For more details, see Zhang et al. 2014).
Gravitational potential energy structure
From the 3D density structure beneath the Tibetan Plateau, a 3D gravitational potential energy (GPE = ρgz, where ρ denotes the density, g denotes the gravitational acceleration, assumed to be equal to 9.81 m/s2, and z denotes the depth) map can be constructed (Haines et al. 2003; Zhang and Klemperer 2005; Zhang et al. 2014). The GPE difference with respect to the average GPE to the depth of 350 km under the Tibetan Plateau along the seven sections, A-A, B-B, C-C, D-D, E-E, F-F, and G-G, is shown in Figure 6. Along most of these NE-SW sections not only the distribution in space of Vs and ρ but also that of the GPE difference evidence that, in some instances, the subducted lithosphere is less dense than the ambient rocks, and thus, the lithosphere cannot be driven by its negative buoyancy (i.e., slab pull). Therefore, the subduction process requires the presence of another dynamical force that is able to drag the upper plate lithosphere over the Indian plate. Possible alternative mechanisms are discussed by Riguzzi et al. (2010). These observations highlight that the top asthenosphere (LVZ) acts as the lithosphere base decoupling, and the underlying mantle should flow NE-ward to SE-ward along the tectonic mainstream (see Crespi et al. 2007; Panza et al. 2010).
Results and discussion
Figure 7 displays the geometry of the metasomatic lid. The GPE sections suggest that mantle flow contributes to the Indian plate subduction as far as the BNS. The spatial distribution of the metasomatic mantle wedge (both Lid and LVZ) may have lubricated the decoupling layer at the base of the Asia plate (Doglioni et al. 2009), thereby facilitating its SW-ward motion, which can be identified in the plate motion models relative to the hotspot reference frame (Crespi et al. 2007).
The collision of the Indian and Asian plates is accompanied by a low convergence-shortening ratio (about 1.2) since the convergence is partitioned both in the subduction and shortening, and the subduction is relatively slower than the ongoing contraction in the upper and lower plates (Doglioni et al. 2007; Gong and Chen 2014). This type of setting wherein the subduction hinge converges relative to the upper plate generates a forebelt synthetic to the subduction and a conjugate retrobelt (Doglioni et al. 2007). The Himalayan orogeny represents the coalescence of several oceanic and continental subduction zones (e.g., Yin and Harrison 2000), and the Tibetan Plateau is the area separating the active forebelt and the retrobelt, where the uplift is constrained by the isostatic readjustment due to either the convective removal of the lithosphere or the achieved critical taper of the orogenic wedge whose mechanical evolution needs to occur laterally (e.g., Molnar et al. 1993; Dahlen 1990). The direction of the Himalaya subduction is along the trend of the tectonic equator that deviates from NE to SE moving from India to China as indicated both by plate motions in the last 50 Ma and the GPS data in the no-net rotation and net rotation reference frames (Crespi et al. 2007). Therefore, the W-E extension in the Tibetan Plateau is compatible with the global flow of plates, and it may be related to the back-arc extension operating along the western margin of the Pacific realm and not necessarily to tectonic escape.
The investigations of the seismic velocity and the density structures support the subduction of the Indian lithosphere, dragged NE-ward by the mantle flow. The slab should contribute to the metasomatism of the overlying mantle wedge (Lid and LVZ) north of the BNS.
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We would like to thank Gan, WJ, for providing the GPS data. The Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB03010700) and the National Natural Science Foundation of China (41021063, 41374064) supported this research. We also acknowledge support from the Italian PRIN projects 2008, 2011, PNRA projects 2004/2.7-2.8, 2009/A2.17.
The authors declare that they have no competing interests.
YD, GP, ZZ, and CD developed the main framework. All authors carried out the theoretical considerations and read and approved the final manuscript.
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Deng, Y., Panza, G.F., Zhang, Z. et al. Transition from continental collision to tectonic escape? A geophysical perspective on lateral expansion of the northern Tibetan Plateau. Earth Planet Sp 66, 10 (2014) doi:10.1186/1880-5981-66-10
- Tibetan plateau
- Continental collision
- System transition
- Net rotation of the lithosphere