Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton
Previous studies showed a heterogeneous temporal and spatial pattern of lithospheric thinning beneath North China Craton(NCC).The idea is mainly built on the diachronous eruption of the earliest asthenosphere-derived magmas in northern and southern NCC. In this study,we carried out Ar-Ar dating on t...
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| Format: | Journal Article |
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Zhongguo Kexueyuan Guangzhou Diqiu Huaxue Yanjiusuo
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/27676 |
| _version_ | 1848752329785868288 |
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| author | Kuang, Y. Pang, Chongjin Hong, L. Zhong, Y. Xu, Y. |
| author_facet | Kuang, Y. Pang, Chongjin Hong, L. Zhong, Y. Xu, Y. |
| author_sort | Kuang, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Previous studies showed a heterogeneous temporal and spatial pattern of lithospheric thinning beneath North China Craton(NCC).The idea is mainly built on the diachronous eruption of the earliest asthenosphere-derived magmas in northern and southern NCC. In this study,we carried out Ar-Ar dating on the Xiguanzhuang tholeiitic basalt(the Jiaolai basin).40 Ar-39 Ar data show that it erupted at 96±3 Ma,thus belonging to the Qingshan Group,earlier than the Daxizhuang alkaline basalt(73 Ma) of the Wangshi Group. Both rocks show no negative Nb and Ta anomalies, but display E-MORB-like and OIB-like trace element distribution patterns, respectively. However, the Xiguanzhuang tholeiitic basalts have higher (87 Sr/86 Sr) and lower ε Nd(t)(0.7058,0.37～0.57) than the Daxizhuang alkaline basalts(0.7040,5.5～5.7). It is suggested that the former was formed as a result of interaction between asthenospheric melts and old-enriched lithosphere, whereas the latter represents asthenosphere-derived melts.The ε Nd(t) values in the studied magmas increase with decreasing age, consistent with upwelling of asthenosphere subsequent to the thinning of ancient lithosphere. This marks lithospheric thinning during Late Cretaceous-Early Cenozoic. Similar temporal variations in ε Nd(t) values are also observed for magmas in the western(120～100 Ma) and eastern(80～60 Ma) Liaoning province. This again attests to diachroneity of lithospheric thinning processes beneath the North China Craton. |
| first_indexed | 2025-11-14T08:06:54Z |
| format | Journal Article |
| id | curtin-20.500.11937-27676 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:06:54Z |
| publishDate | 2012 |
| publisher | Zhongguo Kexueyuan Guangzhou Diqiu Huaxue Yanjiusuo |
| recordtype | eprints |
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| spelling | curtin-20.500.11937-276762017-01-30T13:00:33Z Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton Kuang, Y. Pang, Chongjin Hong, L. Zhong, Y. Xu, Y. Ar-Ar dating Cretaceous basalt Jiaolai basin Geochemistry lithospheric thinning and accretion North China Craton Previous studies showed a heterogeneous temporal and spatial pattern of lithospheric thinning beneath North China Craton(NCC).The idea is mainly built on the diachronous eruption of the earliest asthenosphere-derived magmas in northern and southern NCC. In this study,we carried out Ar-Ar dating on the Xiguanzhuang tholeiitic basalt(the Jiaolai basin).40 Ar-39 Ar data show that it erupted at 96±3 Ma,thus belonging to the Qingshan Group,earlier than the Daxizhuang alkaline basalt(73 Ma) of the Wangshi Group. Both rocks show no negative Nb and Ta anomalies, but display E-MORB-like and OIB-like trace element distribution patterns, respectively. However, the Xiguanzhuang tholeiitic basalts have higher (87 Sr/86 Sr) and lower ε Nd(t)(0.7058,0.37～0.57) than the Daxizhuang alkaline basalts(0.7040,5.5～5.7). It is suggested that the former was formed as a result of interaction between asthenospheric melts and old-enriched lithosphere, whereas the latter represents asthenosphere-derived melts.The ε Nd(t) values in the studied magmas increase with decreasing age, consistent with upwelling of asthenosphere subsequent to the thinning of ancient lithosphere. This marks lithospheric thinning during Late Cretaceous-Early Cenozoic. Similar temporal variations in ε Nd(t) values are also observed for magmas in the western(120～100 Ma) and eastern(80～60 Ma) Liaoning province. This again attests to diachroneity of lithospheric thinning processes beneath the North China Craton. 2012 Journal Article http://hdl.handle.net/20.500.11937/27676 Zhongguo Kexueyuan Guangzhou Diqiu Huaxue Yanjiusuo restricted |
| spellingShingle | Ar-Ar dating Cretaceous basalt Jiaolai basin Geochemistry lithospheric thinning and accretion North China Craton Kuang, Y. Pang, Chongjin Hong, L. Zhong, Y. Xu, Y. Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton |
| title | Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton |
| title_full | Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton |
| title_fullStr | Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton |
| title_full_unstemmed | Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton |
| title_short | Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton |
| title_sort | geochronology and geochemistry of the late cretaceous basalts in the jiaolai basin: constraints on lithospheric thinning and accretion beneath north china craton |
| topic | Ar-Ar dating Cretaceous basalt Jiaolai basin Geochemistry lithospheric thinning and accretion North China Craton |
| url | http://hdl.handle.net/20.500.11937/27676 |