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| Titel |
Meso-Cenozoic thermal-rheological evolution in Jiyang sub-basin, Bohai Bay Basin and its implication for basin extension revealed by numerical modelling |
| VerfasserIn |
Lu Li, Nansheng Qiu, Wei Xu |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250125848
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| Publikation (Nr.) |
 EGU/EGU2016-5497.pdf |
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| Zusammenfassung |
| Jiyang sub-basin is an oil-rich depression located in the southeast of Bohai Bay Basin, which
is one of the most important hydrocarbon area in east of China. The thermal-rheological
structure of the lithosphere can explain the dynamics evolution processes of basins,
continental margins and orogenic belts, which directly reflects the characteristics of the
lithosphere geodynamics. Nevertheless it is poorly to understand the evolution of
lithospheric thermal-rheological structure in Jiyang sub-basin and its implication for basin
extension. In this study, two dimensional numerical modelling is applied to calculate the
paleo-temperature field and the thermo-lithospheric structure, which are used to estimate the
evolution of lithospheric thermal-rheological structure. The results of study show that in
Mesozoic the lithosphere was of relative rigidity and stable, as featured by large
thickness and strength whereas after late Cretaceous the lithospheric strength decreased
rapidly. The analysis of thermal-rheological properties shows that the lithospheric
thermo-lithospheric structure is sandwiched-like with two ductile layers and two
brittle layers. The upper crust is usually brittle. The brittle layers appear at outer
20km of the crust, below 20km ductile deformation predominates. There is also
a 10km brittle layer on the top of the upper mantle. The integrated lithospheric
yield strength is about 1.3-4.5×1012N/m, showing a weak lithosphere which may
support the idea that the extension achieved by the ductile flow below the brittle
layers.
Keywords: lithospheric thermal-rheological structure; Jiyang sub-basin; Numerical
modeling |
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