新墨西哥州埃斯帕诺拉盆地南部地层学与构造

D. Koning, P. Johnson, A. Read, V. Grauch, S. Minor
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摘要

正在进行的研究已经完善了我们对圣达菲南部Española盆地南部地层学和结构的理解。在这里,特苏克组(渐新世-中新世)的四个岩石地层单元在横向上相互分级。岩石层S主要是由源自Picuris-Pecos断层以东的圣达菲河沉积的含砾砂。向南,岩质S横向演化为砂质和粉质砂质A岩质,源自南桑格雷德·克里斯多山脉。岩石层E通常由Cieneguilla玄武岩和Espinaso组的侵蚀形成的泥质砂组成,该组位于圣菲海湾和圣多明各盆地之间的古地形高地的东侧。第四个岩质体位于岩质体S内,由粘土和砂质粘土组成,厚度可能达150米,在圣达菲机场附近的Arroyo Hondo北部被钻孔穿透。我们解释说,这些粘土沉积物沉积在一个封闭盆地的湖泊或盐湖中,可能是在中期(?)的快速构造沉降期间沉积的。中新世。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stratigraphy and structure of the southern Espanola Basin, New Mexico
On-going studies have refined our understanding of the stratigraphy and structure of the southern Española basin south of Santa Fe. Here, four lithostratigraphic units of the Tesuque Fm (Oligocene-Miocene) laterally grade into one another. Lithosome S is mostly a pebbly sand deposited by an ancestral Santa Fe River sourced east of the Picuris-Pecos fault. To the south, lithosome S laterally grades into sand and silty sand of lithosome A derived from the southern Sangre de Cristo Mountains. Lithosome E generally consists of muddy sand derived from erosion of Cieneguilla Basalt and Espinaso Formation on the eastern flank of a paleotopographic high between the Santa Fe embayment and Santo Domingo basin. A fourth lithosome within lithosome S consists of clay and sandy clay, possibly as thick as 150 m, that is penetrated by drill holes north of Arroyo Hondo near the Santa Fe Airport. We interpret that these clayey sediments were deposited in a lake or playa in a closed basin, possibly during rapid tectonic subsidence during the middle(?) Miocene.
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