Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions
South China is a well-known grand felsic igneous rocks province. However, it is still controversial and not well understood whether the Mesozoic tectono-magmatic pattern is dominated by the subduction of the paleo-Pacific oceanic plate. In this study, we address this question by concentrating on the...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2022-08-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.948723/full |
| _version_ | 1811342143184175104 |
|---|---|
| author | Jin-Hua Qin Fan Huang Deng-Hong Wang |
| author_facet | Jin-Hua Qin Fan Huang Deng-Hong Wang |
| author_sort | Jin-Hua Qin |
| collection | DOAJ |
| description | South China is a well-known grand felsic igneous rocks province. However, it is still controversial and not well understood whether the Mesozoic tectono-magmatic pattern is dominated by the subduction of the paleo-Pacific oceanic plate. In this study, we address this question by concentrating on the long-term evolutionary Guandimiao batholith, which has complex lithofacies with different formation ages and can be a superb record of the Mesozoic tectonic evolution in South China. Geochronologically, four stages of magmatism can be identified combined with previous reports: granodiorite (G1, 239 Ma), biotite monzogranite (G2-1) and two-mica monzogranite (G2-2) (230–203 Ma), granite porphyry (G3, 211–190 Ma), and lamprophyre (L4, 121 Ma). G1 and G2-1 have an affinity with I-type granite and were derived from metabasaltic to metatonalitic sources, whereas G2 and G3 show S-type granite characteristics and were derived from the para-metamorphic basement of the Cathaysia block. The L4 was derived from partial melting of garnet and spinel lherzolite and underwent mixing between Mesoproterozoic pelagic and/or terrigenous sediments and the subcontinental lithosphere mantle (SCLM) of South China. The granitoids of the Guandimiao batholith underwent intensely fractional crystallization of feldspar, Ti-bearing minerals, allanite and monazite. The zircon U–Pb dating of L4 in the Guandimiao batholith completely records the six stages of pre-Mesozoic tectonic events in the SCB. During the Mesozoic, the main body of the Guandimiao batholith (G1, G2-1 and G2-2) recorded the closure of the paleo-Tethys Ocean in the Triassic and the subsequent regional extension of the postcollision. G-3 and L4 of the Guandimiao batholith documented the transition of tectonic and dynamic regimes in the early Yanshanian and the rollback and steep subduction of the paleo-Pacific Ocean in the late Yanshanian. |
| first_indexed | 2024-04-13T19:06:19Z |
| format | Article |
| id | doaj.art-bbc498e9e54f4a13b8bd60573363afa0 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T19:06:19Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-bbc498e9e54f4a13b8bd60573363afa02022-12-22T02:33:59ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-08-011010.3389/feart.2022.948723948723Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusionsJin-Hua QinFan HuangDeng-Hong WangSouth China is a well-known grand felsic igneous rocks province. However, it is still controversial and not well understood whether the Mesozoic tectono-magmatic pattern is dominated by the subduction of the paleo-Pacific oceanic plate. In this study, we address this question by concentrating on the long-term evolutionary Guandimiao batholith, which has complex lithofacies with different formation ages and can be a superb record of the Mesozoic tectonic evolution in South China. Geochronologically, four stages of magmatism can be identified combined with previous reports: granodiorite (G1, 239 Ma), biotite monzogranite (G2-1) and two-mica monzogranite (G2-2) (230–203 Ma), granite porphyry (G3, 211–190 Ma), and lamprophyre (L4, 121 Ma). G1 and G2-1 have an affinity with I-type granite and were derived from metabasaltic to metatonalitic sources, whereas G2 and G3 show S-type granite characteristics and were derived from the para-metamorphic basement of the Cathaysia block. The L4 was derived from partial melting of garnet and spinel lherzolite and underwent mixing between Mesoproterozoic pelagic and/or terrigenous sediments and the subcontinental lithosphere mantle (SCLM) of South China. The granitoids of the Guandimiao batholith underwent intensely fractional crystallization of feldspar, Ti-bearing minerals, allanite and monazite. The zircon U–Pb dating of L4 in the Guandimiao batholith completely records the six stages of pre-Mesozoic tectonic events in the SCB. During the Mesozoic, the main body of the Guandimiao batholith (G1, G2-1 and G2-2) recorded the closure of the paleo-Tethys Ocean in the Triassic and the subsequent regional extension of the postcollision. G-3 and L4 of the Guandimiao batholith documented the transition of tectonic and dynamic regimes in the early Yanshanian and the rollback and steep subduction of the paleo-Pacific Ocean in the late Yanshanian.https://www.frontiersin.org/articles/10.3389/feart.2022.948723/fullGuandimiao batholithgranitoidsLamprophyrepetrogenesistectonic evolution |
| spellingShingle | Jin-Hua Qin Fan Huang Deng-Hong Wang Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions Frontiers in Earth Science Guandimiao batholith granitoids Lamprophyre petrogenesis tectonic evolution |
| title | Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions |
| title_full | Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions |
| title_fullStr | Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions |
| title_full_unstemmed | Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions |
| title_short | Batholith recorded mesozoic multistage tectonic evolution of the South china block: A case study of the guandimiao intrusions |
| title_sort | batholith recorded mesozoic multistage tectonic evolution of the south china block a case study of the guandimiao intrusions |
| topic | Guandimiao batholith granitoids Lamprophyre petrogenesis tectonic evolution |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.948723/full |
| work_keys_str_mv | AT jinhuaqin batholithrecordedmesozoicmultistagetectonicevolutionofthesouthchinablockacasestudyoftheguandimiaointrusions AT fanhuang batholithrecordedmesozoicmultistagetectonicevolutionofthesouthchinablockacasestudyoftheguandimiaointrusions AT denghongwang batholithrecordedmesozoicmultistagetectonicevolutionofthesouthchinablockacasestudyoftheguandimiaointrusions |