Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China)
The tectonics of the Proto-Tethys Ocean during the Early Devonian are still heavily debated in the North Qilian orogen. In order to further constrain this issue, we explore geology, chronology, geochemistry, and isotopes of three newly discovered Early Devonian adakitic granitoids of the Jiayuguan c...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
GeoScienceWorld
2024-12-01
|
| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/gsw/lithosphere/article-pdf/doi/10.2113/2024/lithosphere_2023_178/7076555/lithosphere_2023_178.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832591579580203008 |
|---|---|
| author | Qigui Mao Wenjiao Xiao Rui Li Songjian Ao Dongfang Song Miao Sang Hao Wang Zhou Tan |
| author_facet | Qigui Mao Wenjiao Xiao Rui Li Songjian Ao Dongfang Song Miao Sang Hao Wang Zhou Tan |
| author_sort | Qigui Mao |
| collection | DOAJ |
| description | The tectonics of the Proto-Tethys Ocean during the Early Devonian are still heavily debated in the North Qilian orogen. In order to further constrain this issue, we explore geology, chronology, geochemistry, and isotopes of three newly discovered Early Devonian adakitic granitoids of the Jiayuguan complex in the North Qilian orogen, NW China. The granitoids exhibit typical adakitic geochemical signatures with high SiO2 (>56%), Na, Al, and Sr contents, depleted in Yb and Y, and high Sr/Y (82–277) and (La/Yb)N (7.65–15.16) values. Additionally, their high Mg# (62–68) and εHf(t) (+6.5–+11.9) values indicate partial melting of slab genesis. However, they have comparatively low εNd(t) (−2.3–+0.13). Their incompatible Hf and Nd isotopes could be caused by contamination between the source magma and continental crust during the emplacement processes. The three adakitic granitoids yield zircon U–Pb ages of 415–403 Ma, implying that the northern Qilian Ocean was subducting until the Early Devonian (403 Ma) and that young/hot/ridge subduction formed the Jiayuguan adakitic granitoids. Combined with regional data, we propose that the Proto-Tethys Ocean was subducting until 403 Ma in the Qilian area. |
| format | Article |
| id | doaj-art-6d618a66a45a4dfebbaca6aef450b16d |
| institution | Kabale University |
| issn | 1941-8264 1947-4253 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj-art-6d618a66a45a4dfebbaca6aef450b16d2025-01-22T09:27:19ZengGeoScienceWorldLithosphere1941-82641947-42532024-12-012024410.2113/2024/lithosphere_2023_178Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China)Qigui Mao0https://orcid.org/0000-0001-8326-8560Wenjiao Xiao1https://orcid.org/0000-0003-3518-0526Rui Li2https://orcid.org/0000-0002-9931-854XSongjian Ao3Dongfang Song4Miao Sang5Hao Wang6Zhou Tan7National Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, ChinaNational Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, ChinaNational Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, ChinaState Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing , 100029, ChinaState Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing , 100029, ChinaNational Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, ChinaNational Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, ChinaNational Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, ChinaThe tectonics of the Proto-Tethys Ocean during the Early Devonian are still heavily debated in the North Qilian orogen. In order to further constrain this issue, we explore geology, chronology, geochemistry, and isotopes of three newly discovered Early Devonian adakitic granitoids of the Jiayuguan complex in the North Qilian orogen, NW China. The granitoids exhibit typical adakitic geochemical signatures with high SiO2 (>56%), Na, Al, and Sr contents, depleted in Yb and Y, and high Sr/Y (82–277) and (La/Yb)N (7.65–15.16) values. Additionally, their high Mg# (62–68) and εHf(t) (+6.5–+11.9) values indicate partial melting of slab genesis. However, they have comparatively low εNd(t) (−2.3–+0.13). Their incompatible Hf and Nd isotopes could be caused by contamination between the source magma and continental crust during the emplacement processes. The three adakitic granitoids yield zircon U–Pb ages of 415–403 Ma, implying that the northern Qilian Ocean was subducting until the Early Devonian (403 Ma) and that young/hot/ridge subduction formed the Jiayuguan adakitic granitoids. Combined with regional data, we propose that the Proto-Tethys Ocean was subducting until 403 Ma in the Qilian area.https://pubs.geoscienceworld.org/gsw/lithosphere/article-pdf/doi/10.2113/2024/lithosphere_2023_178/7076555/lithosphere_2023_178.pdf |
| spellingShingle | Qigui Mao Wenjiao Xiao Rui Li Songjian Ao Dongfang Song Miao Sang Hao Wang Zhou Tan Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) Lithosphere |
| title | Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) |
| title_full | Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) |
| title_fullStr | Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) |
| title_full_unstemmed | Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) |
| title_short | Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) |
| title_sort | early devonian slab melting of the proto tethys ocean insights from adakitic granitoids in the jiayuguan area hexi corridor nw china |
| url | https://pubs.geoscienceworld.org/gsw/lithosphere/article-pdf/doi/10.2113/2024/lithosphere_2023_178/7076555/lithosphere_2023_178.pdf |
| work_keys_str_mv | AT qiguimao earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT wenjiaoxiao earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT ruili earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT songjianao earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT dongfangsong earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT miaosang earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT haowang earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina AT zhoutan earlydevonianslabmeltingoftheprototethysoceaninsightsfromadakiticgranitoidsinthejiayuguanareahexicorridornwchina |