Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China
Detrital zircon U-Pb dating of the Xingfuzhilu Formation in southern Inner Mongolia yields a maximum depositional age of around 220 Ma. The predominantly Permian and Triassic zircons are characterized by oscillatory zoning and euhedral shapes, with mostly positive zircon εHf(t) values (+2.0 to +16.4...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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American Geophysical Union
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/18361 |
| _version_ | 1848749723839627264 |
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| author | Li, S. Wilde, Simon He, Z. Jiang, X. Liu, R. Zhao, L. |
| author_facet | Li, S. Wilde, Simon He, Z. Jiang, X. Liu, R. Zhao, L. |
| author_sort | Li, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Detrital zircon U-Pb dating of the Xingfuzhilu Formation in southern Inner Mongolia yields a maximum depositional age of around 220 Ma. The predominantly Permian and Triassic zircons are characterized by oscillatory zoning and euhedral shapes, with mostly positive zircon εHf(t) values (+2.0 to +16.4), indicating that they were derived from a proximal magmatic source. Early-Middle Paleozoic zircons have variable zircon εHf(t) values from −6.2 to +11.2 and are characterized by weak oscillatory zoning and subhedral-subrounded shapes, suggesting that the sources are a proximal magmatic arc, possibly mixed with components of the Ondor Sum magmatic arc and the magmatic arc at the northern margin of the North China Craton. The remnants of Precambrian blocks in the southeastern Central Asian Orogenic Belt (CAOB), and the North China Craton may also have been a minor source region for the Xingfuzhilu succession. These results, combined with regional data, indicate that a closing remnant ocean basin or narrow seaway possibly existed in the Middle Permian (Guadalupian) immediately prior to final collision of the CAOB and closure of the Paleo-Asian Ocean. Subsequent collision resulted in the crustal uplift and thickening along the Solonker suture zone, accompanied by possible slab break-off and lithospheric delamination during the Latest Permian to Middle Triassic. The resultant orogen in the Late Triassic underwent exhumation and denudation of rocks in response to the postorogenic collapse and regional extension. Vertical crustal growth in the Triassic is documented by detrital zircons from the Xingfuzhilu Formation and appears to have been widespread across entire eastern CAOB. |
| first_indexed | 2025-11-14T07:25:29Z |
| format | Journal Article |
| id | curtin-20.500.11937-18361 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:25:29Z |
| publishDate | 2014 |
| publisher | American Geophysical Union |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-183612017-09-13T15:57:55Z Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China Li, S. Wilde, Simon He, Z. Jiang, X. Liu, R. Zhao, L. Detrital zircon U-Pb dating of the Xingfuzhilu Formation in southern Inner Mongolia yields a maximum depositional age of around 220 Ma. The predominantly Permian and Triassic zircons are characterized by oscillatory zoning and euhedral shapes, with mostly positive zircon εHf(t) values (+2.0 to +16.4), indicating that they were derived from a proximal magmatic source. Early-Middle Paleozoic zircons have variable zircon εHf(t) values from −6.2 to +11.2 and are characterized by weak oscillatory zoning and subhedral-subrounded shapes, suggesting that the sources are a proximal magmatic arc, possibly mixed with components of the Ondor Sum magmatic arc and the magmatic arc at the northern margin of the North China Craton. The remnants of Precambrian blocks in the southeastern Central Asian Orogenic Belt (CAOB), and the North China Craton may also have been a minor source region for the Xingfuzhilu succession. These results, combined with regional data, indicate that a closing remnant ocean basin or narrow seaway possibly existed in the Middle Permian (Guadalupian) immediately prior to final collision of the CAOB and closure of the Paleo-Asian Ocean. Subsequent collision resulted in the crustal uplift and thickening along the Solonker suture zone, accompanied by possible slab break-off and lithospheric delamination during the Latest Permian to Middle Triassic. The resultant orogen in the Late Triassic underwent exhumation and denudation of rocks in response to the postorogenic collapse and regional extension. Vertical crustal growth in the Triassic is documented by detrital zircons from the Xingfuzhilu Formation and appears to have been widespread across entire eastern CAOB. 2014 Journal Article http://hdl.handle.net/20.500.11937/18361 10.1002/2013TC003444 American Geophysical Union fulltext |
| spellingShingle | Li, S. Wilde, Simon He, Z. Jiang, X. Liu, R. Zhao, L. Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China |
| title | Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China |
| title_full | Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China |
| title_fullStr | Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China |
| title_full_unstemmed | Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China |
| title_short | Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China |
| title_sort | triassic sedimentation and postaccretionary crustal evolution along the solonker suture zone in inner mongolia, china |
| url | http://hdl.handle.net/20.500.11937/18361 |