Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau
Bordered by the Longmu Co-Shuang Hu-Lancangjiang suture zone in the north and east, as well as the Bangong Nujiang suture zone in the south and west, the southern Qiangtang terrane is one of the least-studied blocks in the Tibetan region. The early tectonic evolution of the southern Qiangtang terran...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2017-03-01
|
| Series: | Solid Earth Sciences |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2451912X1630006X |
| _version_ | 1831793099779604480 |
|---|---|
| author | Tingyuan Yuan Liandong Wu Yan Liu Huaqi Li |
| author_facet | Tingyuan Yuan Liandong Wu Yan Liu Huaqi Li |
| author_sort | Tingyuan Yuan |
| collection | DOAJ |
| description | Bordered by the Longmu Co-Shuang Hu-Lancangjiang suture zone in the north and east, as well as the Bangong Nujiang suture zone in the south and west, the southern Qiangtang terrane is one of the least-studied blocks in the Tibetan region. The early tectonic evolution of the southern Qiangtang terrane has remained a controversy for a long time. Here we report granulites from the Tongka high-grade metamorphic complexes in the southern Qiangtang terrane. The mafic granulites occur as small lenses in the felsic granulites and leucogranites with peak mineral assemblage including garnet (core) + diopside + low An plagioclase + quartz. The retrograde assemblage is represented by garnet (rim) + pargasite + high An plagioclase + quartz. The fine-grained aggregates of feldspar + garnet + aluminosilicates + rutile around reddish-brown biotite relics in the felsic granulites are interpreted as products of partial melting of biotites. Thermobarometric estimates for the peak assemblages of the mafic rocks are P = 17.5 kbar and T = 811 °C, whereas the retrograde assemblages of the mafic rocks experienced decompression to P = 10.4 kbar, at T = 674 °C. Zircon texture and SIMS U-Pb data reveal that the felsic granulites were derived from Achaean to Proterozoic sedimentary rocks that underwent high-temperature metamorphism and transformation to paragneisses or granitoids at 1100 to 1000 Ma. During 950–900 Ma, the crystalline rocks were further buried deeply to be transformed into the felsic granulites. We therefore interpret the Tongka high-grade metamorphic complexes to be a portion of the Rodinian continental collision belt. Evidently some domains of the Rodinian continental crust were thickened during the Grenville events, similar to the more recent processes in the Himalaya and Tibetan plateau. The Tongka high-grade metamorphic complexes which form the basement of the southern Qiangtang terrane was subsequently disrupted and involved in the formation of the great Tibetan plateau during the Cenozoic times. Our work thus highlights the Precambrian history of the southern Qiangtang terrane. |
| first_indexed | 2024-12-22T15:24:42Z |
| format | Article |
| id | doaj.art-8def29bfa84e4c0d9dc156ac5f70d474 |
| institution | Directory Open Access Journal |
| issn | 2451-912X |
| language | English |
| last_indexed | 2024-12-22T15:24:42Z |
| publishDate | 2017-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Solid Earth Sciences |
| spelling | doaj.art-8def29bfa84e4c0d9dc156ac5f70d4742022-12-21T18:21:31ZengElsevierSolid Earth Sciences2451-912X2017-03-0121102210.1016/j.sesci.2017.01.001Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan PlateauTingyuan Yuan0Liandong Wu1Yan Liu2Huaqi Li3School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, ChinaSchool of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, ChinaInstitute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaInstitute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaBordered by the Longmu Co-Shuang Hu-Lancangjiang suture zone in the north and east, as well as the Bangong Nujiang suture zone in the south and west, the southern Qiangtang terrane is one of the least-studied blocks in the Tibetan region. The early tectonic evolution of the southern Qiangtang terrane has remained a controversy for a long time. Here we report granulites from the Tongka high-grade metamorphic complexes in the southern Qiangtang terrane. The mafic granulites occur as small lenses in the felsic granulites and leucogranites with peak mineral assemblage including garnet (core) + diopside + low An plagioclase + quartz. The retrograde assemblage is represented by garnet (rim) + pargasite + high An plagioclase + quartz. The fine-grained aggregates of feldspar + garnet + aluminosilicates + rutile around reddish-brown biotite relics in the felsic granulites are interpreted as products of partial melting of biotites. Thermobarometric estimates for the peak assemblages of the mafic rocks are P = 17.5 kbar and T = 811 °C, whereas the retrograde assemblages of the mafic rocks experienced decompression to P = 10.4 kbar, at T = 674 °C. Zircon texture and SIMS U-Pb data reveal that the felsic granulites were derived from Achaean to Proterozoic sedimentary rocks that underwent high-temperature metamorphism and transformation to paragneisses or granitoids at 1100 to 1000 Ma. During 950–900 Ma, the crystalline rocks were further buried deeply to be transformed into the felsic granulites. We therefore interpret the Tongka high-grade metamorphic complexes to be a portion of the Rodinian continental collision belt. Evidently some domains of the Rodinian continental crust were thickened during the Grenville events, similar to the more recent processes in the Himalaya and Tibetan plateau. The Tongka high-grade metamorphic complexes which form the basement of the southern Qiangtang terrane was subsequently disrupted and involved in the formation of the great Tibetan plateau during the Cenozoic times. Our work thus highlights the Precambrian history of the southern Qiangtang terrane.http://www.sciencedirect.com/science/article/pii/S2451912X1630006XGrenville granulitesRodinian supercontinentSouthern Qiangtang basementTibetan regionTectonic evolution |
| spellingShingle | Tingyuan Yuan Liandong Wu Yan Liu Huaqi Li Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau Solid Earth Sciences Grenville granulites Rodinian supercontinent Southern Qiangtang basement Tibetan region Tectonic evolution |
| title | Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau |
| title_full | Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau |
| title_fullStr | Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau |
| title_full_unstemmed | Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau |
| title_short | Rodinian granulites from southern Qiangtang terrane: Implications for tectonic evolution of the Tibetan Plateau |
| title_sort | rodinian granulites from southern qiangtang terrane implications for tectonic evolution of the tibetan plateau |
| topic | Grenville granulites Rodinian supercontinent Southern Qiangtang basement Tibetan region Tectonic evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2451912X1630006X |
| work_keys_str_mv | AT tingyuanyuan rodiniangranulitesfromsouthernqiangtangterraneimplicationsfortectonicevolutionofthetibetanplateau AT liandongwu rodiniangranulitesfromsouthernqiangtangterraneimplicationsfortectonicevolutionofthetibetanplateau AT yanliu rodiniangranulitesfromsouthernqiangtangterraneimplicationsfortectonicevolutionofthetibetanplateau AT huaqili rodiniangranulitesfromsouthernqiangtangterraneimplicationsfortectonicevolutionofthetibetanplateau |