Structural evolution of the Neogene Gar Basin, western Tibet: Implications for releasing bend development and drainage patterns
文献类型：期刊论文
| 作者 | Sanchez, Veronica I.1; Murphy, Michael A.1; Dupre, William R.1; Ding, Lin2,3; Zhang, Ran1 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2010-05-01 |
| 卷号 | 122期号:5-6页码:926-945 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B26566.1 |
| 文献子类 | Article |
| 英文摘要 | We investigated the interaction among basin-bounding faults, basin fill, and geomorphic features of the southern Gar Basin, one of only two known releasing double-bend basins along the Karakoram fault, to better understand their structural evolution and role in basin development. The southern Gar Basin is bounded by an similar to 44-km-long, N20 degrees W-striking central fault segment flanked by two N40 degrees W-striking segments that parallel the regional strike of the Karakoram fault system. The central fault segment is composed of a system of strike-slip and normal faults that young basinward and incorporate basin fill in their uplifted footwalls. The oldest faults along the extensional portion of the bend are dominantly strike-slip, and they strike similar to 15 degrees W from the main strike of the Karakoram fault. Basin fill is broadly folded about a NNW-trending axis and can be explained by E-SE-directed slip along a listric normal fault. Cross sections across the basin and associated faults suggest the geometry is best described as an extensional flower structure. Forward structural modeling of the intrabasinal faults shows that the system has accommodated similar to 8 km of east-west extension. We interpret the bend to have formed from linking of R and P shears into a through-going principal displacement zone. At shallow levels in the crust (low confining pressures), R shears are exploited; at deeper levels, these faults merge with the principal displacement zone, forming the extensional flower structure geometry. We estimate that the shear zone is 50-35 km wide based on the aerial distribution of P and R shears. Restoration of R shears on the west and east sides of the Gar Valley indicates similar to 55 km of right-lateral separation along the Karakoram fault, which is a minimum slip estimate for the Karakoram fault system. |
| WOS关键词 | PULL-APART BASINS ; KARAKORAM FAULT SYSTEM ; STRIKE-SLIP FAULTS ; INDIA-ASIA COLLISION ; ALTYN TAGH FAULT ; SOUTHWEST TIBET ; ACTIVE DEFORMATION ; SOUTHERN TIBET ; ALLUVIAL-FAN ; SHEAR ZONES |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000278350800020 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| 资助机构 | National Science Foundation(EAR-0438826) ; National Science Foundation(EAR-0438826) ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; National Science Foundation(EAR-0438826) ; National Science Foundation(EAR-0438826) ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; National Science Foundation(EAR-0438826) ; National Science Foundation(EAR-0438826) ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) ; National Science Foundation(EAR-0438826) ; National Science Foundation(EAR-0438826) ; National Natural Science Foundation of China(40625008) ; National Natural Science Foundation of China(40625008) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/72673]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Sanchez, Veronica I. |
| 作者单位 | 1.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sanchez, Veronica I.,Murphy, Michael A.,Dupre, William R.,et al. Structural evolution of the Neogene Gar Basin, western Tibet: Implications for releasing bend development and drainage patterns[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2010,122(5-6):926-945. |
| APA | Sanchez, Veronica I.,Murphy, Michael A.,Dupre, William R.,Ding, Lin,&Zhang, Ran.(2010).Structural evolution of the Neogene Gar Basin, western Tibet: Implications for releasing bend development and drainage patterns.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,122(5-6),926-945. |
| MLA | Sanchez, Veronica I.,et al."Structural evolution of the Neogene Gar Basin, western Tibet: Implications for releasing bend development and drainage patterns".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 122.5-6(2010):926-945. |
入库方式： OAI收割
来源：地质与地球物理研究所
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