文章摘要
方 向.柴达木盆地西部地区新生代沉积与构造演化[J].地质与勘探,2014,50(1):28-36
柴达木盆地西部地区新生代沉积与构造演化
Cenozoic Sedimentary and Tectonic Evolution in the Western Qaidam Basin
投稿时间:2013-01-24  修订日期:2013-04-20
DOI:
中文关键词: 柴西地区 新生代 构造 纵弯褶皱
英文关键词: the western Qaidam Basin, Cenozoic, tectonics, crustal folding
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作者单位
方 向 中国石油勘探开发研究院北京 
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中文摘要:
      [摘要]新生代柴西地区南北变形具有很好的对称性,盆地边缘发育高角度逆冲断层,古近纪时期库木库里和苏干湖盆地与柴达木盆地相连,据此认为柴西地区是地壳纵弯褶皱的机制下形成的新生代向斜沉降区。其构造演化经历了古新世~渐新世早期纵弯褶皱形成、晚渐新世~中新世纵弯褶皱发展和晚期盆内断褶构造强烈活动三个阶段,控制了相应时期的沉积边界和沉积相分布。古近纪时期库木库里盆地和苏干湖盆地是柴达木盆地的一部分,新近纪以来,由于盆缘逆冲断层的活动,库木库里和苏干湖盆地逐步与柴达木盆地分割开来。据此认为盆地中部一里坪地区和盆地边缘的油气勘探有较大潜力。
英文摘要:
      Abstract: It is suggested that the Qaidam Basin are generated as a result of crustal buckling or folding, manifesting itself as a synclinal depression in Cenozoic.There are similiar deformation on the south and north parts of the Qaidam Basin, occurrence of major high-angle reverse faults at basin margins, and generation of adjacent intermontane Suhai and Kumukol Basins. It is shown that the western Qaidam Basin experienced three distinct tectonic evolution stages: the first stage was the forming of crustal folding in the Paleocene–early Oligocene interval;the second stage was further development of the megafold during the late Oligocene to the Middle Miocene; The Qaidam Basin entered the third stage when it underwent strong contractional deformations characterized by intrabasinal folding and faulting.The deposit boundaries and sedimentary facies are controlled by every structural stage correspondly.And both of the Suhai Basin and Kumukol Basin are a part of the Qaidam Basin during the Early Paleozoic . The Suhai and Kumukol Basins were subsequently isolated from the Qaidam Basin as a result of basinward thrusting in basin-margin areas. Therefore,there are some potential petroleum exploration area , such as the Yiliping area in central part and the margin area.
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