Drainage reorganization and Laramide tectonics in north‐central New Mexico and downstream effects in the Gulf of Mexico
Drainage reorganization and Laramide tectonics in north‐central New Mexico and downstream effects in the Gulf of Mexico
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DOI：
10.1111/bre.12373
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发表时间：
2019-06
期刊：
影响因子：
3.2
通讯作者：
Tyson M. Smith;K. Sundell;S. Johnston;Carlos N. Guilherme Andrade;Ross A. Andrea;J. Dickinson;Yiduo Liu;Michael Andrew Murphy;T. Lapen;J. Saylor
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文献类型：
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作者：
Tyson M. Smith;K. Sundell;S. Johnston;Carlos N. Guilherme Andrade;Ross A. Andrea;J. Dickinson;Yiduo Liu;Michael Andrew Murphy;T. Lapen;J. Saylor
新墨西哥州中北部的El Rito和Galisteo沉积中心记录了构造驱动的古近纪水系重组，其影响影响了墨西哥湾西北缘的沉积作用。尽管相隔约100 km，且缺乏El Rito组的沉积年代学，但上述两个新墨西哥沉积中心通常被认为是具有同时代沉积和共享调节机制的单个盆地的残余。碎屑锆石U-Pb最大沉积年龄表明，El Rito和Galisteo地层不是同时代的。此外，地层厚度趋势和映射关系表明Galisteo和El Rito沉积中心的不同调节机制;分别是构造引起的沉降与下切地形的填充。界定El Rito和Galisteo地层基底的区域不整合面是由始新世早期局部构造活动和相关排水重组引起的相关表面，并被河流沉积物的向北上超历时埋藏。两个沉积中心的碎屑锆石分布表明，不整合面上方的中生代地层的再循环增加，但随着局部基底隆起的地形突出性减弱，上部出现分歧。这些沉积中心的沉积物捕获与其他外部排水Laramide盆地的沉积是同时代的。此外，它对应于一个时期的低Laramide省的沉积物输入和替代阿巴拉契亚源沉积物沿着西北边缘的墨西哥湾在全盆地海侵。这说明了在一个横贯大陆的排水系统的集水区内沉积物储存的口袋可能对接收海洋盆地的沉积记录产生的潜在影响。
The El Rito and Galisteo depocenters in north‐central New Mexico archive tectonically‐driven Paleogene drainage reorganization, the effects of which influenced sedimentation along the northwestern margin of the Gulf of Mexico. Although separated by ~100 km and lacking depositional chronology for the El Rito Formation, the two aforementioned New Mexican depocenters are commonly considered remnants of a single basin with coeval deposition and shared accommodation mechanism. Detrital zircon U‐Pb maximum depositional ages indicate that the El Rito and Galisteo formations are not coeval. Moreover, stratigraphic thickness trends and mapping relationships indicate different accommodation mechanisms for the Galisteo and El Rito depocenters; tectonically‐induced subsidence versus infilling of incised topography, respectively. The regional unconformity that bounds the base of both the El Rito and Galisteo formations is a correlative surface induced by local tectonic activity and associated drainage reorganization in the early Eocene, and was diachronously buried by northward onlap of fluvial sediments. Detrital zircon distributions in both depocenters indicate increased recycling of Mesozoic strata above the unconformity, but diverge upsection as topographic prominence of local basement‐involved uplifts waned. Sediment capture in these depocenters is coeval with deposition in other externally‐drained Laramide basins. Further, it corresponds to a period of low Laramide province‐derived sediment input and replacement by Appalachian‐sourced sediment along the northwestern margin of the Gulf of Mexico during a basin‐wide transgression. This illustrates the potential effect that pockets of sediment storage within the catchment of a transcontinental drainage system can have over the sedimentary record in the receiving marine basin.