JIA Jin hua, LIU Huan jie, GUO Ying hai. Late Carboniferous Depositional Systems and High-Resolution Sequence Cycles of the Western Ordos Basin —Taking Hulusitai Section as an example[J]. Acta Sedimentologica Sinica, 1999, 17(3): 397-402.
| Citation:
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JIA Jin hua, LIU Huan jie, GUO Ying hai. Late Carboniferous Depositional Systems and High-Resolution Sequence Cycles of the Western Ordos Basin —Taking Hulusitai Section as an example[J]. Acta Sedimentologica Sinica, 1999, 17(3): 397-402.
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Late Carboniferous Depositional Systems and High-Resolution Sequence Cycles of the Western Ordos Basin —Taking Hulusitai Section as an example
- Received Date: 1998-06-04
- Publish Date:
1999-09-10
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Abstract
The tectonic setting of the study area was aulacogen in Mesoproterzoic to Early Paleozoic, and impactogen in Late Paleozoic.The lithostrtiagaphic units contain Jingyuan Formation,Yanghugou Formation and Taiyuan Formation during Late Carboniferous in Hulusitai section of Ordos basin.Based on the study of high reselution sequence cycle and depositional systems,sixteen T-R high-reslution sequence cycles occur from Namurian C stage to Stephanian stage in Late Carboniferous strata.There developped barrier-lagoon systems (Jingyuan Fm.and Yanghugou Fm.),barrier-lagoon with carbonate platform composite systems (JingyuanFm.and Yanghugou Fm.)and tidal delta systems(Taiyan Fm.).They average about 1.9 Ma and range from 1.1～3.3 Ma in length,reflecting forth-order relative sea level change cycles,and belong to High-resolution Sequence Cycles.Each T-R sequence is composed of transgressive system tract,early highstand system tract,later highstand system tract,with a few record of forced-regression system tract.In general,lowstand ersional sequence bondary and transgressive surface are merged,with no or few record of the lowstand system tract.Transsion came from Qilian Sea during early-middle stage of Late Carboniferous.Qilian Sea and Huabei Sea were merged in Late Taiyuan stage.But they are not coincident with forth-order sea level fluctuation.It is charcterizied of forth-order sea-kevel change by the slow rising firstly and then dast rising with interenvening period of fall,and then fast falling with a few forced-regression.The third-order sea level change reflects that transgression began in Namurian C stage and reached maxium transgrssion in Wesphalian stage and occoured regression in the end of Carboniferous.So,the relative sea level change from the record of the stratigraphy sequences are the composite sea level change with small-order cycles superimposed with high-order cycles subsidence and sediment influx.Finally,sequence stratigarphic model of paleocoastal plain environment has been proposed.
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