Structure and Kinematics of the Central Transantarctic Mountains: Constraints from structural geology and geomorphology near cape surprise

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The transition zone between the Transantarctic Mountains (TAM) and the West Antarctic rift system is defined as the Transantarctic Mountain Front (TMF). In the vicinity of Cape Surprise (84°30'S) near the Shackleton Glacier in the central TAM, two fault sets have been mapped. Mesoscopic faults and geomorphic trends indicate that one set of normal faults within the TMF is generally dip-slip in nature and strikes parallel to the mountain range. The second fault set is oriented approximately perpendicular to this. Kinematic analysis of lineated fault surfaces reveals an extension axis oriented 020°-040°, orthogonal to the trend of the central TAM. However, asymmetric drainage patterns and a small number of lineated fault surfaces support a kinematic model of Cenozoic dextral transtension in the TMF. While age constraints on these two episodes of deformation are poor, it is likely that dextral transtension followed orthogonal extension, as suggested from other regions of the TAM. Apparent orthogonal extension in the TMF is thus consistent with early Cenozoic rift-flank uplift driven by isostatic forces. A middle to late Cenozoic period of transtension could be contemporaneous with strike-slip faulting in the Ross Sea, and could also indicate less strain partitioning between the rift system and the TMF after the uplift rate decreased.

Original languageEnglish (US)
Pages (from-to)11-24
Number of pages14
JournalTerra Antarctica
Volume8
Issue number1-2
StatePublished - 2001

Fingerprint

Geology
structural geology
geomorphology
geology
kinematics
Biomechanical Phenomena
mountains
Ice Cover
mountain
Oceans and Seas
Drainage
transtension
fault plane
uplift
strain partitioning
dip-slip fault
glaciers
transition zone
normal fault
faulting

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Earth and Planetary Sciences(all)

Cite this

@article{e63e0e3d4a5242988af36a6662f55f0d,
title = "Structure and Kinematics of the Central Transantarctic Mountains: Constraints from structural geology and geomorphology near cape surprise",
abstract = "The transition zone between the Transantarctic Mountains (TAM) and the West Antarctic rift system is defined as the Transantarctic Mountain Front (TMF). In the vicinity of Cape Surprise (84°30'S) near the Shackleton Glacier in the central TAM, two fault sets have been mapped. Mesoscopic faults and geomorphic trends indicate that one set of normal faults within the TMF is generally dip-slip in nature and strikes parallel to the mountain range. The second fault set is oriented approximately perpendicular to this. Kinematic analysis of lineated fault surfaces reveals an extension axis oriented 020°-040°, orthogonal to the trend of the central TAM. However, asymmetric drainage patterns and a small number of lineated fault surfaces support a kinematic model of Cenozoic dextral transtension in the TMF. While age constraints on these two episodes of deformation are poor, it is likely that dextral transtension followed orthogonal extension, as suggested from other regions of the TAM. Apparent orthogonal extension in the TMF is thus consistent with early Cenozoic rift-flank uplift driven by isostatic forces. A middle to late Cenozoic period of transtension could be contemporaneous with strike-slip faulting in the Ross Sea, and could also indicate less strain partitioning between the rift system and the TMF after the uplift rate decreased.",
author = "Miller, {S. R.} and Fitzgerald, {Paul G} and Baldwin, {Suzanne L}",
year = "2001",
language = "English (US)",
volume = "8",
pages = "11--24",
journal = "Terra Antarctica",
issn = "1122-8628",
publisher = "Terra Antarctica Publication",
number = "1-2",

}

TY - JOUR

T1 - Structure and Kinematics of the Central Transantarctic Mountains

T2 - Constraints from structural geology and geomorphology near cape surprise

AU - Miller, S. R.

AU - Fitzgerald, Paul G

AU - Baldwin, Suzanne L

PY - 2001

Y1 - 2001

N2 - The transition zone between the Transantarctic Mountains (TAM) and the West Antarctic rift system is defined as the Transantarctic Mountain Front (TMF). In the vicinity of Cape Surprise (84°30'S) near the Shackleton Glacier in the central TAM, two fault sets have been mapped. Mesoscopic faults and geomorphic trends indicate that one set of normal faults within the TMF is generally dip-slip in nature and strikes parallel to the mountain range. The second fault set is oriented approximately perpendicular to this. Kinematic analysis of lineated fault surfaces reveals an extension axis oriented 020°-040°, orthogonal to the trend of the central TAM. However, asymmetric drainage patterns and a small number of lineated fault surfaces support a kinematic model of Cenozoic dextral transtension in the TMF. While age constraints on these two episodes of deformation are poor, it is likely that dextral transtension followed orthogonal extension, as suggested from other regions of the TAM. Apparent orthogonal extension in the TMF is thus consistent with early Cenozoic rift-flank uplift driven by isostatic forces. A middle to late Cenozoic period of transtension could be contemporaneous with strike-slip faulting in the Ross Sea, and could also indicate less strain partitioning between the rift system and the TMF after the uplift rate decreased.

AB - The transition zone between the Transantarctic Mountains (TAM) and the West Antarctic rift system is defined as the Transantarctic Mountain Front (TMF). In the vicinity of Cape Surprise (84°30'S) near the Shackleton Glacier in the central TAM, two fault sets have been mapped. Mesoscopic faults and geomorphic trends indicate that one set of normal faults within the TMF is generally dip-slip in nature and strikes parallel to the mountain range. The second fault set is oriented approximately perpendicular to this. Kinematic analysis of lineated fault surfaces reveals an extension axis oriented 020°-040°, orthogonal to the trend of the central TAM. However, asymmetric drainage patterns and a small number of lineated fault surfaces support a kinematic model of Cenozoic dextral transtension in the TMF. While age constraints on these two episodes of deformation are poor, it is likely that dextral transtension followed orthogonal extension, as suggested from other regions of the TAM. Apparent orthogonal extension in the TMF is thus consistent with early Cenozoic rift-flank uplift driven by isostatic forces. A middle to late Cenozoic period of transtension could be contemporaneous with strike-slip faulting in the Ross Sea, and could also indicate less strain partitioning between the rift system and the TMF after the uplift rate decreased.

UR - http://www.scopus.com/inward/record.url?scp=0035203441&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035203441&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0035203441

VL - 8

SP - 11

EP - 24

JO - Terra Antarctica

JF - Terra Antarctica

SN - 1122-8628

IS - 1-2

ER -