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| 川西龙门山前陆盆地构造沉降初步分析 |
| 张箭,徐强,廖仕孟,朱同兴 |
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(1. 中石化西南石油局 研究院, 四川 成都 610081;
2. 成都地质矿产研究所, 四川 成都 610082;
3. 北京大学, 北京 100871;
4. 西南油气田 川西北气矿, 四川 绵阳 621709) |
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| 摘要: |
| 研究表明,龙门山冲断带是川西前陆盆地的主要物源区,它的逆冲推覆活动直接控制着川西前陆盆地的沉积类型和沉积物供给量。晚三叠世诺利期、瑞替期和晚侏罗世早中期是川西前陆盆地构造沉降速率较高时期,反映龙门山冲断带在这些时期的逆冲推覆速率较大,是逆冲推覆作用构造抬升的强烈时期;而早侏罗世是该地区构造沉降速率相对较小时期,反映龙门山冲断带在早侏罗世的逆冲推覆抬升速率较小,是逆冲推覆作用相对平静时期。同时,估算龙门山逆冲推覆体在各个不同时期的抬升高度和抬升速率。 |
| 关键词: 龙门山 前陆盆地 构造沉降 四川 |
| DOI： |
| 附件 |
| 投稿时间：2002-07-31 |
| 基金项目:国土资源部油气藏地质及开发工程国家重点实验室基金项目 |
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| Tectonic subsidence of the Longmenshan foreland basin in western Sichuan |
| ZHANG Jian, XU Qiang, LIAO Shi-meng, ZHU Tong-xing |
(1. Southwest China Bureau of Petroleum, Chengdu 610081, Sichuan, China;
2. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China;
3. Beijing University, Beijing 100871, China;
4. Northwest Sichuan Gas Field, Mianyang 621709, Sichuan, China) |
| Abstract: |
| The Longmenshan thrust zone is considered as the principal source area of the Longmenshan foreland basin in western Sichuan, and the thrusting as the main controls on sediment type and supply to the foreland basin. The greater tectonic subsidence rates appeared during the Norian and Rhaetian of the Late Triassic and early and middle Late Jurassic have reflected the greater thrusting and uplifting rates of the Longmenshan area during these periods. The smaller tectonic subsidence rates appeared during the Early Jurassic represent the smaller thrusting and uplifting rates of this area during this period. The thrusting and uplifting rates of the Longmenshan thrust nappe are estimated for various geologic times. |
| Key words: Longmen Mountains foreland basin tectonic subsidence Sichuan |