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首页> 外文期刊>Canadian journal of earth sciences >Cenozoic tectonic and thermal history of the Nenana basin, central interior Alaska: new constraints from seismic reflection data, fracture history, and apatite fission-track analyses
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Cenozoic tectonic and thermal history of the Nenana basin, central interior Alaska: new constraints from seismic reflection data, fracture history, and apatite fission-track analyses

机译：新生代构造和Nenana盆地的热历史，中央室内阿拉斯加：来自地震反射数据，裂缝史和磷灰石裂变轨道分析的新约束

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摘要

The Nenana basin of interior Alaska forms a segment of the diffuse plate boundary between the Bering and North American plates and is located within a complex zone of crustal-scale strike-slip deformation that accommodates compressional stresses in response to oblique plate convergence to the south. The basin is currently the focus of new oil and gas exploration. Integration of seismic reflection and well data, fracture data, and apatite fission-track analyses with regional data improves our understanding of the tectonic development of this continental strike-slip basin. The Nenana basin formed during the Late Paleocene as a 13 km wide half-graben, affected by regional intraplate magmatism and localized crustal thinning across the Minto Fault in south-central Alaska. The basin was uplifted and exhumed along this faulted margin in the Early Eocene through to Late Oligocene in response to oblique subduction along the southern Alaska margin. This event resulted in the removal of up to 1.5 km of Late Paleocene strata from the basin. Renewed rifting and subsidence during the Early Miocene widened the basin to the west resulting in deposition of Miocene non-marine clastic rocks in reactivated and newly formed extensional half-grabens. In the Middle to Late Miocene, left lateral strike-slip faulting was superimposed on this half-graben system, with rapid subsidence beginning in the Pliocene and continuing to the present day. At present, the Nenana basin is in a zone of transtensional deformation that accommodates compressional stresses in response to oblique plate convergence and allows tectonic subsidence by oblique extension along major basin-bounding strike-slip faults.
机译：内部阿拉斯加的Nenana盆地形成了膨胀和北美板之间的漫射板边界的一段，位于地壳尺度击球变形的复杂区域内，该速度达到南部倾斜钢板融合的压缩应力。该盆地目前是新石油和天然气勘探的重点。地震反射和井数据的整合，骨折数据和磷灰石裂变轨道分析与区域数据的分析提高了我们对这款大陆防滑盆地构造发展的理解。 Nenana盆地在古典后期形成为13公里的半法，受到区域内部岩浆岩石的影响，并在阿拉斯加南部宫廷断路中受到局部地壳稀疏。盆地在早期的eocene中沿着这个断层缘抬起并挖掘到晚期寡核苷酸，以应对沿着阿拉斯加南部的南部南部的斜面。这一事件导致从盆地中删除高达1.5公里的古典茂地层。早期内科内的再次散步和沉降扩大了西部的盆地，导致内蒙非海洋碎屑岩的沉积在重新激活和新形成的延伸半胶中。在中部到后期的中生，左侧防滑断裂叠加在这个半法的系统上，在整个沉降中，在整个突出的沉降中，并继续到今天。目前，Nenana盆地处于触发变形区域，其响应于倾斜板收敛而容纳压缩应力，并允许构造沉降沿着主要盆地边界防滑故障倾斜延伸。

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  • 来源
    《Canadian journal of earth sciences》 |2017年第7期|共19页
  • 作者

    Dixit Nilesh; Hanks Catherine; Rizzo Alec; McCarthy Paul; Coakley Bernard;

  • 作者单位

    Univ Alaska Fairbanks Inst Geophys Dept Geosci POB 755780 Fairbanks AK 99775 USA;

    Univ Alaska Fairbanks Inst Geophys Dept Geosci POB 755780 Fairbanks AK 99775 USA;

    Univ Alaska Fairbanks Inst Geophys Dept Geosci POB 755780 Fairbanks AK 99775 USA;

    Univ Alaska Fairbanks Inst Geophys Dept Geosci POB 755780 Fairbanks AK 99775 USA;

    Univ Alaska Fairbanks Inst Geophys Dept Geosci POB 755780 Fairbanks AK 99775 USA;

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  • 正文语种 eng
  • 中图分类 天文学、地球科学;
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