塔里木盆地石炭系与下伏地层构造运动面分析
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摘要
石炭系与下伏地层间不整合是海西早期构造运动形成的构造运动面,反映了该期构造运动的性质、强度和影响范围,代表塔里木盆地一次重要的构造反转事件。利用地震剖面、裂变径迹及镜质体反射率资料恢复的地层剥蚀量表明,剥蚀厚度等值线走向近东西,与盆地挤压反转构造的走向基本一致。塔中和塔北地区遭受强烈的剥蚀,最大剥蚀厚度达1200余米。从其不整合的分布特征来看,这次构造运动亦表现出南北强中部(北部坳陷)弱的特点,在时间上表现出构造抬升自南而北和自西向东的迁移特点。
The unconformity between Carboniferous and the underling sequences was a tectonic movement surface caused by Early Hercynian tectonic movement. It revealed the property, intensity and influenced scope of the tectonic movement. And it also represented a very important tectonic reversal event in the Tarim Basin. Using seismic section, fission track of apatite samples and vitrinite reflectance(Ro), the denudation thickness of the basin was restored. The results showed that the isopach strike of denudation thickness is nearly from east to west and it is similar to the direction of compressionalreversal structure of the basin. In the middle and north part of the basin the denudation was very intense, and the maximum denudation thickness could reach to 1 200 m. According to the distribution characteristics of the unconformity, the intensity of the tectonic movement was strong in the north and south, but was weak in the middle of the basin. Meanwhile it showed migration of tectonic uplift from south to north and from west to east in time succession.
The unconformity between Carboniferous and the underling sequences was a tectonic movement surface caused by Early Hercynian tectonic movement. It revealed the property, intensity and influenced scope of the tectonic movement. And it also represented a very important tectonic reversal event in the Tarim Basin. Using seismic section, fission track of apatite samples and vitrinite reflectance(Ro), the denudation thickness of the basin was restored. The results showed that the isopach strike of denudation thickness is nearly from east to west and it is similar to the direction of compressionalreversal structure of the basin. In the middle and north part of the basin the denudation was very intense, and the maximum denudation thickness could reach to 1 200 m. According to the distribution characteristics of the unconformity, the intensity of the tectonic movement was strong in the north and south, but was weak in the middle of the basin. Meanwhile it showed migration of tectonic uplift from south to north and from west to east in time succession.
引文
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[3] 周中毅,潘长春.沉积盆地古地温测定方法及其应用[M].广州:广东科技出版社,1992.68-104.
[4] 周礼成,冯 石,王世成,等.用裂变径迹长度分布模拟地层剥蚀量和热史[J].石油学报,1994,15(3):26-34.
[5] 周祖翼.裂变径迹分析及其在沉积盆地研究中的应用[J].石油实验地质,2001,23(3):333.
[6] WallaceGDow.Kerogenstudiesandgeologicalinterpretation[J].JournlofGeochemicalExploration,1977,2:79-99.
[7] 刘国臣,张一伟.从波动观点看塔里木盆地的成藏演化史[J].石油学报,1999,20(2):7-11.
[8] 黄河源.天山运动特征及区域地质意义[J].新疆地质,1986,4(2):82-93.
[9] 谢晓安,吴奇之,卢华复.塔里木盆地古生代构造格架与构造特征[J].沉积学报,1997,15(1):152-155.
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