| 鄂尔多斯盆地中南部中侏罗世延安期沉积体系及岩相古地理演化 |
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| 引用本文：时志强,韩永林,赵俊兴,杨阳,冀小林.2003.鄂尔多斯盆地中南部中侏罗世延安期沉积体系及岩相古地理演化[J].地球学报,24(1):49-54. |
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| 基金项目:国家自然科学基金项目 (批准号 :49772 10 6 )的研究成果。 |
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| 中文摘要:依据新的地层划分方案及大量钻井、露头及岩芯资料，详细研究了鄂尔多斯中南部地区中侏罗世延安期沉积体系、岩相古地理特征及演化。认为延10期为冲积扇－河流沉积体系，低弯度砾砂质河道发育，盆地内存在多个古地貌高地，4条水系汇入甘陕主河；延9至延6期为多源河湖三角洲沉积体系，具大三角洲平原、中三角洲前缘和小前三角洲的特征，三角洲平原及前缘的位置不断向湖区推进；延4＋5期为网状河－残余湖泊沉积体系，湖泊淤塞，水体变浅。延9至延4＋5期网状砂质河道发育，西部地区广泛发育平原沼泽煤系沉积。 |
| 中文关键词:沉积体系 岩相古地理 鄂尔多斯 延安组 沉积盆地 |
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| Depositional System and Paleogeographic Evolution of the Middle Jurassic Yan'anian Stage in the Central and Southern Ordos Basin |
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| Abstract:Based on the new stratigraphic division draft and large quantities of drilling, outcrop and core data, the author has studied in detail depositional systems, paleogeographic characteristics and evolution of the Middle Jurassic Yan'anian Stage in the central and southern Ordos Basin. It is held that the fan fluvial sedimentary system was predominant and gently curving calculous-arenaceous fluvial channels were developed at the first substage of the Yan'anian Stage, i.e., Yan 10 substage. There were several paleogeomorphological highlands and 4 rivers running into the Ganshan River at Yan 10 substage. From Yan 9 to Yan 6 substage, there was the fluvial lake delta sedimentary system in the basin which had relatively large delta plain, middle delta front and comparatively small prodelta. At Yan 4+5 substage the braided river and remaining lake sedimentary system was predominant and the lake was silted up. Braided arenaceous fluvial channels were developed, and paludal coal-bearing sediments were well developed from Yan 9 to Yan 4+5 substage in the western part. |
| keywords:depositional system lithofacies paleogeography Ordos Yan'an Formation sedimentary basin |
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