Sequence stratigraphy of tidally influenced deposits in a salt-withdrawal minibasin: Upper sandstone member of the Potrerillos Formation (Paleocene), La Popa basin, Mexico

D. C. Shelley; T. F. Lawton

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Sequence stratigraphy of tidally influenced deposits in a salt-withdrawal minibasin: Upper sandstone member of the Potrerillos Formation (Paleocene), La Popa basin, Mexico

机译：排盐小型盆地中受潮汐影响的沉积层序地层学：墨西哥拉波帕盆地Potrerillos组（古新世）上砂岩段

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The Potrerillos minibasin of the La Popa basin, Mexico, is defined by the Carroza syncline and bounded by the El Gordo anticline and the La Popa salt weld. Stratigraphic geometries and facies distribution of the upper sandstone member of the Potrerillos Formation within the minibasin indicate that diapirism, shortening, and deposition were simultaneous and complexly interrelated during the Paleocene. The upper sandstone member is a regressive succession of marginal marine, siliciclastic deposits. Wave-dominated shoreface deposits consist of mudstone, siltstone, and sandstone and are interpreted to represent offshore to upper shoreface environments. Tide-dominated environments are heterogeneous and grouped into four broad classes based on the energy of the depositional environment. Lower delta-plain deposits range from mudstone to sandstone and are interpreted to represent channel, flood-plain, and lagoonal environments. Sedimentary structure orientations indicate asymmetrical, bidirectional paleocurrents with a dominant southeast trend parallel to regional structural trends. Unconformity-bounded strata onlap the El Gordo anticline, indicating syndepositional folding and control of the depositional system by detachment fold trends in the basin.

机译：墨西哥La Popa盆地的Potrerillos微型盆地由Carroza向斜线定义，并由El Gordo背斜线和La Popa盐焊缝界定。小盆地内Potrerillos 上层砂岩段的地层几何学和相分布表明，二叠纪，缩短，和沉积是同时且复杂的在古新世期间相互关联的。上部砂岩成员是边缘海相硅质碎屑岩的递归接替。波浪为主的海岸面沉积物由泥岩，粉砂岩和砂岩组成，并被解释为代表海上至上海岸环境。潮汐主导的环境是异构的，并根据沉积环境的能量分为四大类。较低的三角洲平原沉积物范围从泥岩到砂岩，并被解释为代表河道，洪泛平原和泻湖环境。沉积结构的方向表示不对称的双向古流，东南方向的显性趋势平行于区域结构的趋势。 El Gordo背斜上的不整合面地层，表明盆地的沉积褶皱趋势控制了沉积沉积系统的同沉积和控制。

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《AAPG Bulletin》 |2005年第9期|00001157-00001179|共23页
作者
D. C. Shelley; T. F. Lawton;
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Department of Geological Sciences, University of South Carolina, Columbia, South Carolina 29208dshelley@geol.sc.edu;

Institute of Tectonic Studies, New Mexico State University, Las Cruces, New Mexico 88003tlawton@nmsu.edu;

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机译：排盐小盆地中受潮汐影响的沉积层序地层学：墨西哥拉波帕盆地Potrerillos组（新世）上砂岩段
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Sequence stratigraphy of tidally influenced deposits in a salt-withdrawal minibasin: Upper sandstone member of the Potrerillos Formation (Paleocene), La Popa basin, Mexico

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