Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton
dc.contributor.author | Kuang, Y. | |
dc.contributor.author | Pang, Chongjin | |
dc.contributor.author | Hong, L. | |
dc.contributor.author | Zhong, Y. | |
dc.contributor.author | Xu, Y. | |
dc.date.accessioned | 2017-01-30T13:00:33Z | |
dc.date.available | 2017-01-30T13:00:33Z | |
dc.date.created | 2013-03-17T20:00:35Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Kuang, Yongsheng and Pang, Chongjin and Hong, Lubing and Zhong, Yuting and Xu, Yi-gang. 2012. Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton. Geotectonica et Metallogenia. 36 (4): pp. 559-571. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/27676 | |
dc.description.abstract |
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. | |
dc.publisher | Zhongguo Kexueyuan Guangzhou Diqiu Huaxue Yanjiusuo | |
dc.subject | Ar-Ar dating | |
dc.subject | Cretaceous basalt | |
dc.subject | Jiaolai basin | |
dc.subject | Geochemistry | |
dc.subject | lithospheric thinning and accretion | |
dc.subject | North China Craton | |
dc.title | Geochronology and Geochemistry of the Late Cretaceous Basalts in the Jiaolai Basin: Constraints on Lithospheric Thinning and Accretion Beneath North China Craton | |
dc.type | Journal Article | |
dcterms.source.volume | 36 | |
dcterms.source.number | 4 | |
dcterms.source.startPage | 559 | |
dcterms.source.endPage | 571 | |
dcterms.source.issn | 1006-513X | |
dcterms.source.title | Geotectonica et Metallogenia | |
curtin.department | ||
curtin.accessStatus | Fulltext not available |