Characteristics and Formation Mechanism of Thrust Structures in the Eastern Margin of Pamir Salient: Insights from Analogue Modeling and Discussion

被引：0

作者：

Wu Z. ^{[1
]}

Yin H. ^{[2
]}

Zhang T. ^{[3
]}

Fan X. ^{[4
]}

机构：

[1] Earthquake Administrator of Jiangsu Province, Nanjing, 210014, Jiangsu

[2] School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210046, Jiangsu

[3] Shenyang Geological Survey, CGS, Shenyang, 110034, Liaoning

[4] Department of the Urban Rail Transit, Nanjing Tech University, Nanjing, 210009, Jiangsu

来源：

Geotectonica et Metallogenia | 2017年 / 41卷 / 04期

关键词：

Analogue modeling; Eastern margin of Pamir salient; Oblique compression; Southwestern Tarim Basin; Strike-slip structure;

D O I：

10.16539/j.ddgzyckx.2017.03.013

中图分类号：

学科分类号：

摘要：

Two models with different boundary conditions were carried out to simulate the structural evolution of the Kekeya-Hetian fold-and-thrust belt and Kashi-Yecheng strike-slip belt in the eastern margin of Pamir salient, respectively. The analogue modeling results show that: (1) Both of the Kekeya-Hetian fold-and-thrust belt and Kashi-Yecheng strike-slip belt in the eastern margin of Pamir salient were formed under compressive shearing. Strike-slip faults occurred within both of the belts, but the displacement of these strike-slip faults in the Kekeya-Hetian fold-and-thrust belt is less than that in the Kashi-Yecheng strike-slip belt; (2) The Kekeya-Hetian fold-and-thrust belt is mainly under the influence of compression stress with weaker shearing stress while the Kashi-Yecheng strike-slip belt is mainly under the influence of shearing stress with oblique compressive stress. The strike-slip faults are mainly located in the piedmont within these two belts. The effect of the strike-slip fault diminishes towards the front of the thrust belt (to the interior basin); (3) In the front of the boundary strike-slip faults (to the interior basin), the intersecting arc thrust faults occurred successively along the shortening direction. These structural features demonstrated that the structures evolved northwards in the eastern margin of Pamir salient; (4) The oblique compression does not necessarily result in high angle faults or vertical faults, whereas low-middle angle thrust faults with strike-slip displacement are also possible. Hence, more attention should be paid to such thrust faults during the structural analysis of seismic profiles in the eastern margin of Pamir salient (e.g. the structural belts in piedmont of western Tarim Basin). © 2017, Science Press. All right reserved.

引用

页码：663 / 677

页数：14

共 15 条

[1]

Colletta B., Letouzey J., Pinedo R., Ballard J.F., Bale P., Computerized X-ray tomography analysis of sandbox models: Examples of thin-skined thrust systems, Geology, 19, 11, pp. 1063-1067, (1991)

[2]

Cowgill E., Cenozoic right-slip faulting along the eastern margin of the Pamir salient, northwestern China, Geological Society of America Bulletin, 122, 1, pp. 145-161, (2010)

[3]

Fu B.H., Ninomiya Y., Guo J.M., Slip partitioning in the northeast Pamir-Tian Shan convergence zone, Tectonophysics, 483, 3-4, pp. 344-364, (2010)

[4]

Koyi H.A., Vendeville B.C., The effect of décollement dip on geometry and kinematics of model accretionary wedges, Journal of Structural Geology, 25, 9, pp. 1445-1450, (2003)

[5]

Massoli D., Koyi H.A., Barchi M.R., Structural evolution of a fold and thrust belt generated by multiple décollements: Analogue models and natural examples from the Northern Apennines (Italy), Journal of Structural Geology, 28, 2, pp. 185-199, (2006)

[6]

McClay K., Whitehouse P., Dooley T., Richards M., 3D evolution of fold and thrust belts formed by oblique convergence, Marine and Petroleum Geology, 21, 7, pp. 857-877, (2004)

[7]

Mohadjer S., Bendick R., Ischuk A., Kuzikov S., Kostuk A., Saydullaev U., Lodi S., Kakar D.M., Wasy A., Khan M.A., Molnar P., Bilham R., Zubovich A.V., Partitioning of India-Eurasia convergence in the Pamir-Hindu Kush from GPS measurements, Geophysical Research Letters, 37, 4, pp. 1-6, (2010)

[8]

Molnar P., Tapponnier P., Cenozoic tectonics of Asia: Effects of a continental collision: Features of recent continental tectonics in Asia can be interpreted as results of the India-Eurasia collision, Science, 189, 4201, pp. 419-426, (1975)

[9]

Peltzer G., Tapponnier P., Armijo R., Magnitude of late Quaternary left-lateral movement along the north edge of Tibet, Science, 246, 4935, pp. 1285-1289, (1989)

[10]

Reiter K., Kukowski N., Ratschbacher L., The interaction of two indenters in analogue experiments and implications for curved fold-and-thrust belts, Earth and Planetary Science Letters, 302, 1-2, pp. 132-146, (2011)

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