New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault
Zircons and monazites from 6 samples of the North Ayilari dextral shear zone (NAsz), part of the Karakorum fault zone (KFZ), have been dated with the U-Th-Pb method, using both ID-TIMS and SIMS techniques. The ages reveal (1) inheritance fr...
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
2012
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/95119 http://hdl.handle.net/10220/8731 |
| _version_ | 1811697387340562432 |
|---|---|
| author | Liu, Dunyi Deloule, Etienne Xu, Zhiqin Mahéo, Gweltaz. Guillot, Stéphane Valli, Franck Leloup, Philippe Hervé Paquette, Jean-Louis Arnaud, Nicolas Li, Haibing Tapponnier, Paul Lacassin, Robin |
| author_facet | Liu, Dunyi Deloule, Etienne Xu, Zhiqin Mahéo, Gweltaz. Guillot, Stéphane Valli, Franck Leloup, Philippe Hervé Paquette, Jean-Louis Arnaud, Nicolas Li, Haibing Tapponnier, Paul Lacassin, Robin |
| author_sort | Liu, Dunyi |
| collection | NTU |
| description | Zircons and monazites from 6 samples of the
North Ayilari dextral shear zone (NAsz), part of the
Karakorum fault zone (KFZ), have been dated with
the U-Th-Pb method, using both ID-TIMS and SIMS
techniques. The ages reveal (1) inheritance from
several events spanning a long period between the
late Archean and the Jurassic; (2) an Eocene-
Oligocene magmatic event ( ~35–32 Ma); (3) an
Oligo-Miocene magmatic event ( ~25–22 Ma), at least
partly synkinematic to the right-lateral deformation;
and (4) a period of metamorphism metasomatism
( ~22–14 Ma) interpreted as thermal and fluid
advection in the shear zone. The Labhar Kangri
granite located ~375 km farther Southeast along the
KFZ is dated at 21.1 ± 0.3 Ma. Such occurrence of
several Oligo-Miocene granites along the KFZ, some
of which show evidence for synkinematic
emplacement, suggests that the fault zone played an
important role in the genesis and /or collection of
crustal melts. We discuss several scenarios for the
onset and propagation of the KFZ, and offset estimates
based on the main sutures zones. Our preferred
scenario is an Oligo-Miocene initiation of the fault
close to the NA range, and propagation along most of
its length prior to ~19 Ma. In its southern half, the
averaged long-term fault-rate of the KFZ is greater
than 8 to 10 mm/a, in good agreement with some
shorter-term estimates based on the Indus river course,
or Quaternary moraines and geodesy. Our results show the KFZ cannot be considered as a small transient fault
but played a major role in the collision history. |
| first_indexed | 2024-10-01T07:54:27Z |
| format | Journal Article |
| id | ntu-10356/95119 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:54:27Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/951192020-09-26T21:36:57Z New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault Liu, Dunyi Deloule, Etienne Xu, Zhiqin Mahéo, Gweltaz. Guillot, Stéphane Valli, Franck Leloup, Philippe Hervé Paquette, Jean-Louis Arnaud, Nicolas Li, Haibing Tapponnier, Paul Lacassin, Robin DRNTU::Science::Geology Zircons and monazites from 6 samples of the North Ayilari dextral shear zone (NAsz), part of the Karakorum fault zone (KFZ), have been dated with the U-Th-Pb method, using both ID-TIMS and SIMS techniques. The ages reveal (1) inheritance from several events spanning a long period between the late Archean and the Jurassic; (2) an Eocene- Oligocene magmatic event ( ~35–32 Ma); (3) an Oligo-Miocene magmatic event ( ~25–22 Ma), at least partly synkinematic to the right-lateral deformation; and (4) a period of metamorphism metasomatism ( ~22–14 Ma) interpreted as thermal and fluid advection in the shear zone. The Labhar Kangri granite located ~375 km farther Southeast along the KFZ is dated at 21.1 ± 0.3 Ma. Such occurrence of several Oligo-Miocene granites along the KFZ, some of which show evidence for synkinematic emplacement, suggests that the fault zone played an important role in the genesis and /or collection of crustal melts. We discuss several scenarios for the onset and propagation of the KFZ, and offset estimates based on the main sutures zones. Our preferred scenario is an Oligo-Miocene initiation of the fault close to the NA range, and propagation along most of its length prior to ~19 Ma. In its southern half, the averaged long-term fault-rate of the KFZ is greater than 8 to 10 mm/a, in good agreement with some shorter-term estimates based on the Indus river course, or Quaternary moraines and geodesy. Our results show the KFZ cannot be considered as a small transient fault but played a major role in the collision history. Published version 2012-10-09T03:45:46Z 2019-12-06T19:08:35Z 2012-10-09T03:45:46Z 2019-12-06T19:08:35Z 2008 2008 Journal Article Valli, F., Leloup, P. H., Paquette, J. L., Arnaud, N., Li, H., Tapponnier, P., et al. (2008). New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault. Tectonics, 27(5). 0278-7407 https://hdl.handle.net/10356/95119 http://hdl.handle.net/10220/8731 10.1029/2007TC002184 en Tectonics © 2008 the American Geophysical Union. This paper was published in Tectonics and is made available as an electronic reprint (preprint) with permission of the American Geophysical Union. The paper can be found at the following official DOI: http://dx.doi.org/10.1029/2007TC002184 . One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. application/pdf |
| spellingShingle | DRNTU::Science::Geology Liu, Dunyi Deloule, Etienne Xu, Zhiqin Mahéo, Gweltaz. Guillot, Stéphane Valli, Franck Leloup, Philippe Hervé Paquette, Jean-Louis Arnaud, Nicolas Li, Haibing Tapponnier, Paul Lacassin, Robin New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault |
| title | New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault |
| title_full | New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault |
| title_fullStr | New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault |
| title_full_unstemmed | New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault |
| title_short | New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault |
| title_sort | new u th pb constraints on timing of shearing and long term slip rate on the karakorum fault |
| topic | DRNTU::Science::Geology |
| url | https://hdl.handle.net/10356/95119 http://hdl.handle.net/10220/8731 |
| work_keys_str_mv | AT liudunyi newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT delouleetienne newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT xuzhiqin newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT maheogweltaz newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT guillotstephane newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT vallifranck newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT leloupphilippeherve newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT paquettejeanlouis newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT arnaudnicolas newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT lihaibing newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT tapponnierpaul newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault AT lacassinrobin newuthpbconstraintsontimingofshearingandlongtermsliprateonthekarakorumfault |