Detrital zircon and apatite fission track data in the Liaoxi basins: Implication to Meso-Cenozoic thermo-tectonic evolution of the northern margin of the North China Craton |
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Authors: | Yi Yan Xiaoqiong Hu Ge Lin Weiliang Liu Zhengjiang Song |
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Institution: | 1.Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Wushan, Guangzhou,P. R. China;2.Tou Tay Oilfield Development Company Limited DaQing,Heilongjiang,P. R. China |
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Abstract: | Detrital zircon and apatite fission track (ZFT and AFT) data of the sandstones collected from the Liaoxi basins served as
a significant probe to study the Meso-Cenozoic thermo-tectonic reactivation events in the northern margin of the North China
Craton. All sandstones show wide ZFT and AFT age spectrum and most of ZFT and AFT ages are younger than depositional age of
respective host rocks, which suggest widespread track resetting of the host rocks in the Liaoxi basins after deposition. This
hot geothermal status in the Liaoxi basins deduced from ZFT and AFT data is temporal consistent with the lithospheric evolution
of the North China Craton, which implies that the lithosphere under the northern margin of the North China Craton underwent
similar thermo-tectonic destruction process as the intracratonic Bohai Sea. The young ZFT peak age, which ranges from ∼50
Ma to 20 Ma, to some extend, provides a temporal constraint on the time that lithosphere significantly thinned and following
reverse of the Liaoxi basins and uplift of the eastern part of the Yan-Liao Orogenic Belt. Exhumation of 1.5–2 km can be estimated
in the eastern part of the Yan-Liao Orogenic Belt since ∼30 Ma to 10 Ma. |
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