Structural evolution of the Gurla Mandhata detachment system, southwest Tibet: Implications for the eastward extent of the Karakoram fault system
文献类型：期刊论文
| 作者 | Murphy, MA; Yin, A; Kapp, P; Harrison, TM; Manning, CE; Ryerson, FJ; Ding, L; Guo, JH |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2002-04-01 |
| 卷号 | 114期号:4页码:428-+ |
| 关键词 | Himalayas kinematics metamorphic core complex strike-slip faults Tibetan plateau |
| ISSN号 | 0016-7606 |
| 文献子类 | Article |
| 英文摘要 | Field mapping and geochronologic and thermobarometric analyses of the Gurla Mandhata area, in southwest Tibet, reveal major middle to late Miocene, east-west extension along a normal-fault system, termed the Gurla Mandhata detachment system. The maximum fault slip occurs along a pair of low-angle normal faults that have caused significant tectonic denudation of the Tethyan Sedimentary Sequence, resulting in juxtaposition of weakly metamorphosed Paleozoic rocks and Tertiary sedimentary rocks in the hanging wall over amphibolite-facies mylonitic schist, marble, gneisses, and variably deformed leucogranite bodies in the footwall. The footwall of the detachment fault system records a late Miocene intrusive event, in part contemporaneous with top-to-the-west ductile normal shearing. The consistency of the mean shear direction within the mylonitic footwall rocks and its correlation with structurally higher brittle normal faults suggest that they represent an evolving low-angle normal-fault system. Ar-40/Ar-39 data from muscovite and biotite from the footwall rocks indicate that it cooled below 400 degreesC by ca. 9 Ma. Consideration of the original depth and dip angle of the detachment fault prior to exhumation of the footwall yields total slip estimates between 66 and 35 km across the Gurla Mandhata detachment system. The slip estimates and timing constraints on the Gurla Mandhata detachment system are comparable to those estimated on the right-slip Karakoram fault system, to which it is interpreted to be kinematically linked. Moreover, the mean shear-sense direction on both the Karakoram fault and the Gurla Mandhata detachment system overlap along the intersection line between the mean orientations of the faults, which further supports a kinematic association. If valid, this interpretation extends previous results that the Karakoram fault extends to mid-crustal depths. |
| WOS关键词 | INDO-ASIAN COLLISION ; SOUTHERN TIBET ; ACTIVE DEFORMATION ; TECTONIC IMPLICATIONS ; ISOTOPIC CONSTRAINTS ; PASSIVE MARGIN ; OROGENIC BELT ; HIMALAYA ; PLATEAU ; AGE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000174842500004 |
| 出版者 | ASSOC ENGINEERING GEOLOGISTS GEOLOGICAL SOCIETY AMER |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77802]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Murphy, MA |
| 作者单位 | 1.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA 2.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA 3.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Murphy, MA,Yin, A,Kapp, P,et al. Structural evolution of the Gurla Mandhata detachment system, southwest Tibet: Implications for the eastward extent of the Karakoram fault system[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2002,114(4):428-+. |
| APA | Murphy, MA.,Yin, A.,Kapp, P.,Harrison, TM.,Manning, CE.,...&Guo, JH.(2002).Structural evolution of the Gurla Mandhata detachment system, southwest Tibet: Implications for the eastward extent of the Karakoram fault system.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,114(4),428-+. |
| MLA | Murphy, MA,et al."Structural evolution of the Gurla Mandhata detachment system, southwest Tibet: Implications for the eastward extent of the Karakoram fault system".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 114.4(2002):428-+. |
入库方式： OAI收割
来源：地质与地球物理研究所
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