| 冀中坳陷南区古近纪砂岩碎屑组分变化及其构造意义 |
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| 引用本文： | 杨明慧,刘池阳,孙冬胜.冀中坳陷南区古近纪砂岩碎屑组分变化及其构造意义[J].矿物学报,2003,23(2):136-142. |
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| 作者姓名： | 杨明慧 刘池阳 孙冬胜 |
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| 作者单位： | 1. 石油大学,盆地与油藏研究中心,北京,102249
2. 石油大学,石油天然气成藏机理教育部重点实验室,北京,102249 |
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| 基金项目： | 国家重点基础研究发展规划项目 (G19990 43 2 0 9)，日本科技厅科技交流项目 ( 97- FT0-1-5 ) |
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| 摘 要： | 据冀中坳陷南部晋县凹陷钻井岩心砂岩碎屑组分、重矿物以及部分常量元素的序列变化分析，该区古近纪地壳曾发生强烈的断块翘倾运动，主要物源类型变化反映裂谷盆地边缘的断块构造背景。砂岩类型从孔二段岩屑砂岩到孔一段至沙二段岩屑长石砂岩、岩屑长石石英砂岩再到沙——东营组岩屑砂岩，为一旋回过程。在垂向上，石英组分向上递增；长石组分呈低高低变化；而碳酸盐岩屑组分则显示上下高、中部低的特点，与正常的地层序列不相匹配。结合盆缘构造演化研究认为，在孔二段大量出现的高碳酸盐岩屑与断块翘倾并与可能的燕山期逆冲断块的侵蚀有关。
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| 关 键 词： | 冀中坳陷 古近纪 砂岩 碎屑组分 重矿物 断块翘倾 负反转构造 常量元素 沉积特征 |
| 文章编号： | 1000-4734(2003)02-0136-07 |
| 修稿时间： | 2002年7月31日 |
COMPOSITIONAL VARIATION OF SANDSTONE DETRITUS AND ITS TECTONIC SIGNIFICANCE IN THE LOWER TERTIARY, SOUTHERN JIZHONG BASIN, CHINA |
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| YANG Ming-hui ,SUN Dong-sheng ,LIU Chi-yang.COMPOSITIONAL VARIATION OF SANDSTONE DETRITUS AND ITS TECTONIC SIGNIFICANCE IN THE LOWER TERTIARY, SOUTHERN JIZHONG BASIN, CHINA[J].Acta Mineralogica Sinica,2003,23(2):136-142. |
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| Authors: | YANG Ming-hui SUN Dong-sheng LIU Chi-yang |
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| Institution: | YANG Ming-hui 1,SUN Dong-sheng 1,LIU Chi-yang |
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| Abstract: | According to research on the variation of detrital composition, heavy minerals and major elements in the Lower Tertiary sandstone from southern Jizhong basin, together with local fault block tilting movement, this paper presents that the primary provenance type reflected fault block tectonic setting at the margin of the rift basin. The sandstone type experienced a cyclic change from lithic sandstone of the 2nd member of the Kongdian Formation, lithic arkose and lithic arkosic quartz sandstone of the 1st member of the Kongdian Formation and the 4th-2nd members of the Shahejie Formation again to lithic sandstone of the 1st member of the Shahejie Formation and the Dongying Formation. In the stratigraphic cross-section, the quartz composition increased upwards, the feldspar composition showed a lower-high-lower variation trend and the lithiclast showing high-lower-high. This condition is contradicted with the natural stratigraphic sequence. In virtue of tectonic evolution at the basin margin, the high lithiclast at the 2nd member of the Kongdian Formation is associated with fault block tilting movement and strong erosion action of nappe sheet possibly was formed in the Yanshanian movement. |
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| Keywords: | Jizhong basin sandstone detrital composition heavy mineral provenance fault-block tilting |
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