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OSL dating of the late Quaternary slip rate on the Gyaring co Fault in central Tibet

Duo Wang
Duo Wang
, 
Gong-Ming Yin
Gong-Ming Yin
, 
Xu-Long Wang
Xu-Long Wang
, 
Chun-Ru Liu
Chun-Ru Liu
, 
Fei Han
Fei Han
 und 
Jin-Hua Du
Jin-Hua Du
   | 30. Jan. 2016
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Online veröffentlicht: 30. Jan. 2016
Seitenbereich: 162 - 173
Eingereicht: 31. Jan. 2016
Akzeptiert: 14. Sept. 2016
DOI: https://doi.org/10.1515/geochr-2015-0040
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© 2016 D. Wang
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

(A) Sketch map of the tectonic setting of the interior of Tibet (after Taylor and Yin, 2009). (B) Map of the major active faults surrounding the Gyaring Co Fault (GCF) zone in central Tibet (white box marks the location in Fig. 1A) (after Taylor et al., 2003). The dotted green line indicates the InSAR sampling area for the GCF (Taylor and Peltzer, 2006). (C) GeoEye image for specified parts of the study area (white boxes). Abbreviations: ACF: Awong Co Fault; ATF: Altyn Tagh Fault; BF: Bue Co Fault; BCF: Beng Co Fault; DCF: Dongqiao Co Fault; GCF: Gyaring Co Fault; JF: Jiali Fault; KF: Karakoram Fault; LCF: Lamu Co Fault; MFT: Main Frontal Thrust; WCF: Wuru Co Fault; XGF: Xiaguo Fault; XDR: Xainza–Dinggye Rift; AKMS: Anyimaqen–Kunlun–Muztag suture zone; BNS: Bangong–Nujiang suture zone; JS: Jinsha suture zone; IYS: Indus Yalu suture zone; DGC: Dongguo Co; GMC: Gemang Co; ZNC: Zhangnai Co; ZGC: Zigui Co; GC: Gyaring Co (‘Co’ means ‘lake’ in Tibetan).
(A) Sketch map of the tectonic setting of the interior of Tibet (after Taylor and Yin, 2009). (B) Map of the major active faults surrounding the Gyaring Co Fault (GCF) zone in central Tibet (white box marks the location in Fig. 1A) (after Taylor et al., 2003). The dotted green line indicates the InSAR sampling area for the GCF (Taylor and Peltzer, 2006). (C) GeoEye image for specified parts of the study area (white boxes). Abbreviations: ACF: Awong Co Fault; ATF: Altyn Tagh Fault; BF: Bue Co Fault; BCF: Beng Co Fault; DCF: Dongqiao Co Fault; GCF: Gyaring Co Fault; JF: Jiali Fault; KF: Karakoram Fault; LCF: Lamu Co Fault; MFT: Main Frontal Thrust; WCF: Wuru Co Fault; XGF: Xiaguo Fault; XDR: Xainza–Dinggye Rift; AKMS: Anyimaqen–Kunlun–Muztag suture zone; BNS: Bangong–Nujiang suture zone; JS: Jinsha suture zone; IYS: Indus Yalu suture zone; DGC: Dongguo Co; GMC: Gemang Co; ZNC: Zhangnai Co; ZGC: Zigui Co; GC: Gyaring Co (‘Co’ means ‘lake’ in Tibetan).

(A) GeoEye image showing two early Q3 fans (Fan1 and Fan2) displaced at the Aerqingsang site. (B) Sketch map based on the Geo-Eye image. (C) Reconstruction of offset showing two fans consistently displaced by ~500 m.
(A) GeoEye image showing two early Q3 fans (Fan1 and Fan2) displaced at the Aerqingsang site. (B) Sketch map based on the Geo-Eye image. (C) Reconstruction of offset showing two fans consistently displaced by ~500 m.

(A) Mosaic photograph showing fault scarps, offsets, and sample locations on Fan1. (B) Close-up photograph showing fault scarps and three faulted rills on Fan1. (C) Photograph showing fault scarps and sag pond on Fan2. (D) Photograph and depth profile showing depositional setting and sample positions for Fan1 at the Aerqingsang site.
(A) Mosaic photograph showing fault scarps, offsets, and sample locations on Fan1. (B) Close-up photograph showing fault scarps and three faulted rills on Fan1. (C) Photograph showing fault scarps and sag pond on Fan2. (D) Photograph and depth profile showing depositional setting and sample positions for Fan1 at the Aerqingsang site.

(A) GeoEye image showing gully and displaced fans at the Quba site. (B) Sketch map based on the GeoEye image and field survey at the Quba site.
(A) GeoEye image showing gully and displaced fans at the Quba site. (B) Sketch map based on the GeoEye image and field survey at the Quba site.

(A) Reconstructed offset based on a 3D surface map (RTK) at Quba site 1. (B) Photograph showing faulted fluvial sediments that form a large sag pond. (C) Photographs and depth profile showing offset markers, depositional setting, and sample positions. (D) GeoEye image showing the displacement of Fan3 at Quba site 1. (E) Sketch map based on the GeoEye image and measurements of offset at Quba site 1.
(A) Reconstructed offset based on a 3D surface map (RTK) at Quba site 1. (B) Photograph showing faulted fluvial sediments that form a large sag pond. (C) Photographs and depth profile showing offset markers, depositional setting, and sample positions. (D) GeoEye image showing the displacement of Fan3 at Quba site 1. (E) Sketch map based on the GeoEye image and measurements of offset at Quba site 1.

(A) Photographs showing gully offset and sample locations, along with a depth profile of the depositional setting at Quba site 2. (B). GeoEye image showing a displaced gully at Quba site 2, along with a geological interpretation and measurements of offset.
(A) Photographs showing gully offset and sample locations, along with a depth profile of the depositional setting at Quba site 2. (B). GeoEye image showing a displaced gully at Quba site 2, along with a geological interpretation and measurements of offset.

OSL ages of displaced geomorphic markers along the Gyaring Co Fault in central Tibet.

Site and landformsMaterialSample No.Depth (m)U (ppm)Th (ppm)K (%)Water content (%)Dose rate (Gy/ka)Equivalent dose (Gy)Age (ka)
AreqingsangFan1-fine sandKCSE-OSL-3

* Alpha efficiency for 4-11μm quartz-grain was taken as 0.04±0.01 (Lu et al., 2007)

0.801.7114.502.0415 ± 54.09 ± 0.22249.08 ± 11.1960.87 ± 4.30
KCSE-OSL-42.102.5213.871.9115 ± 53.40 ± 0.11370.77 ± 22.82109.15 ± 7.62
Qu ba site1Fan3-medium-coarse sandwith gravelOSL-1130.451.456.921.8110 ± 52.93 ± 0.1156.10 ± 4.7019.15 ± 1 .77
OSL-1151.101.667.841.7510 ± 52.89 ± 0.1156.66 ± 5.7619.58 ± 2.12
Quba site 2Fan6 (T1)-fine sand withgravel Fan6 (T2)-silty sandOSL-111

* Alpha efficiency for 4-11μm quartz-grain was taken as 0.04±0.01 (Lu et al., 2007)

1.002.208.511.6910 ± 53.54 ± 0.1929.39 ± 1.808.29 ± 0.67
OSL-990.301.418.811.8810 ± 53.14 ± 0.12174.40 ± 13.8155.61 ± 4.88
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