Late Carboniferous Depositional Systems and High-Resolution Sequence Cycles of the Western Ordos Basin —Taking Hulusitai Section as an example
-
摘要: 鄂尔多斯盆地西缘呼鲁斯太剖面上石炭统包括靖远组、羊虎沟组和太原组，发育有堡岛、堡岛—台地和潮控三角洲三种沉积体系，自下而上可以划分出16个海进－ 海退层序旋回，每个层序旋回的时限为1.1 ～ 3.3Ma, 平均 1.9Ma，相当于四级相对海平面变化旋回，属高频层序旋回。每个层序由海侵体系域和早期高位体系域、晚期高位体系域组成，偶发育有强制海退体系域。晚石炭世早期海侵来自祁连海，太原晚期，祁连海与华北连通。研究区古海平面变化表现为先慢速后快速海侵和快速海退，少数为正常海退，并由此建立了古海岸平原的层序地层模式。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.
-
[1] 1 刘志才.宁夏卫宁北山的石炭系及其对比[J].宁夏地质，1990，2：117～128
2 吴秀元，李星学，沈光隆等.甘肃靖远石炭系研究新进展[J].地层学杂志，1987，11(3)：163～175
3 张抗.鄂尔多斯断块构造和资源[M].西安：陕西科技出版社，1989
4 霍福臣.宁夏地质概论[M].北京：科学出版社，1989
5 袁效奇，耿国仓.鄂尔多斯盆地西缘石炭纪古生态、古地理及古气候初步认识[J].地层学杂志，1987，11(3)：180～186
6 王玉净，袁效奇，耿国仓.鄂尔多斯盆地石炭纪蜓竹类研究新进展及其古地理面貌初探[J].微体古生物学报，1992，9(2)：127～150
7 陈芬，周鸿瑞，孙克勤等.宁夏及邻区石炭纪植物群[J].现代地质，1995，9(1)：1～9
8 崔新省，周鸿端，贾进华.鄂尔多斯盆地西缘中宁、乌达地区石炭纪海相双壳类[J].现代地质，1994，8(4)：403～412
9 Sengor A M,Burke,Dewey J F. Rifts at high angles to orogenic belts:tests for their origins and the upper Rhine Graben as an example[J].Am.Jour.Sci.,1978,278:24～40
10 张福礼，黄舜兴，杨昌贵等.鄂尔多斯盆地天然气地质[M].北京：地质出版社，1994
11 Busch R M, Rollins H B. Correlation of Carboniferous strate using a hierarchy of transgressive-regressive units[J].Geology,1984,12:471～474
12 Posamentier H W, Allen G P,James D P,Tesson M.Forced regressions in a sequence stratigraphic framework:Concepts,examples and exploration signifance[J].AAPG Bulletin,1992,76:1687～1709
13 Swift D J P.Coastal erosion and transgressive stratigraphy[J].Journal of Geology,1968,76:444～456
14 Nummedal D, Swift D J P.Transgressive stratigraphy at sequence-bounding unconformities:some principles derived from Holocene and Cretaceous examples[R].The society of Economic Paleontologists and Mineralogists.1987,241～260
15 Wills A J, Moslow T F.Stratigraphic setting of transgressive barrier-island reservoirs with an example from the Triassic Halfway Formation,Wenbley Field,Alberta,Canada[J].AAPG Bulletin,1994,78(5):775～791
16 Kamola D L,Huntoon J E. Changes in rates of transgression across the Perrian White Rim sandstone,Southerm Utah[J].Journal of Sedimentary Research,1994,B64(2):202～210
17 Goodwin P W,Anderon E J.Punctuated aggradational cycles:a general hypothesis of episodic stratigrpahic accumualtion[J].JournaL of Geology,1985,93:515～533
18 何起祥，业治铮等.受限陆表海的海侵模式[J].沉积学报，1991，9(1)：1～10
19 Ainsworth B R.Marginal marine sedimentology and high resolution sequence analysis;Bearpaw-Horseshoe Canyon transition,Drumheller,Alberta[J].Bulletin of Canadian Petroleum Geology,1994,42(1):26～54
20 Ross C A, Ross J R P.Late Paleozoic depositional sequences are synchronous and worldwide[J].Geology,1985,13:194～197
21 Saunders W B, Ramsbottom W H C.The mid-Carboniferous eustatic event[J].Geology,1986,14:208～212
22 刘本培，李儒峰，尤德宏.黔南独山石炭系层序地层及麦粒蜓带冰川型全球海平面变化[J].地球科学，1994，9(2)：553～564
23 杨瑞东.华南地区石炭纪海平面波动与沉积效应[J].云南地质，1993，12(2)：
24 Veevers J J, Powell C M.Late Paleozoic glacial episodes in Gondwanaland reflected in transgressive-regressive depositional sequence in Euramerica[J].GSAB,1987,98:457～487 -
点击查看大图
计量
- 文章访问数: 554
- HTML全文浏览量: 1
- PDF下载量: 475
- 被引次数: 0
下载:
