Journal of Geophysical Research Solid Earth
Supporting Information for
Crustal Structure beneath the Northern Transantarctic Mountains and Wilkes
Subglacial Basin: Implications for Tectonic Origins
S.E. Hansen1, L.M. Kenyon1, J.H. Graw1, Y. Park2, A.A. Nyblade3
1Geological
Sciences Dept., The University of Alabama, Tuscaloosa, AL, 35487
2Korea
3Geosciences
Polar Research Institute, Incheon, Korea, 406-840
Dept., The Pennsylvania State University, University Park, PA, 16802
Contents of this file
Figures S1 to S3
Introduction
This supporting information provides several supplemental figures, which compliment
the discussion in the main text. These include a cartoon summary of different uplift
models that have been proposed for the TAMs (S1), a map of Sp conversion points
for events recorded by the TAMNNET and KOPRI stations (S2), and additional data
modeling examples comparable to Figure 5 in the main text, but for the remaining
TAMNNET and KOPRI stations (S3).
1
2
3
Figure S1. Different uplift models that have been suggested for the TAMs.
(a)
Asymmetric extension model modified from Fitzgerald et al. (1986), showing an
inferred detachment zone beneath the TAMs.
The asthenosphere-subcrustal
lithosphere boundary was estimated to determine uplift and subsidence as a function
of relative crustal thinning versus subcrustal lithospheric strain. (b) Flexural model
modified from Stern and ten Brink (1989). East and West Antarctica are decoupled
and uplift is primarily driven by a thermal load from hotter mantle beneath West
Antarctica. (c) Gravity-based model modified from Studinger et al. (2004). The top
panel shows the upper crust and ice sheet along their examined profile. The bottom
panel shows the Moho topography used to model their gravity data, with a crustal
root beneath the TAMs.
(d) Plateau collapse model modified from Bialas et al.
(2007). Upper and lower panels show the pre- and post-rift geometry of this model,
respectively, where it is suggested that extension of thick, hot crust leads to elevated
rift flanks with crustal roots and high elevations.
The dashed line denotes the
approximate brittle-ductile transition. (e) Hybrid model modified from Lawrence et
al. (2006), showing inferred structure along the east-west TAMSEIS profile.
This
model incorporates a variety of mechanisms that contribute to the TAMs uplift. See
text for further discussion.
4
Figure S2. Map of the TAMNNET and KOPRI stations (triangles) and the Sp
conversion points at crust-mantle depths for events recorded at each station (circles).
Corresponding event-station pairs are shown with the same color, and station names
are indicated.
5
Figure S3. Data modeling and grid search results for each TAMNNET and KOPRI
station, aside from station APRL (shown in Fig. 5).
Stations are ordered
6
alphabetically, and each page has the same panels and notations as Figure 5 in the
main text. Refer to the Figure 5 caption for additional details.
7
Figure S3 (continued).
8
Figure S3 (continued).
9
Figure S3 (continued).
10
Figure S3 (continued).
11
Figure S3 (continued).
12
Figure S3 (continued).
13
Figure S3 (continued).
14
Figure S3 (continued).
15
Figure S3 (continued).
16
Figure S3 (continued).
17
Figure S3 (continued).
18
Figure S3 (continued).
19
Figure S3 (continued).
20
Figure S3 (continued).
21
Figure S3 (continued).
22