The sedimentary architecture and provenance of the early Mesozoic incipient northern Gulf of Mexico basin remains controversial due to both lack of outcrop exposure and sample scarcity across the southern United States with subcrop depths approaching 6 km. The Eagle Mills Formation and coeval deposition across the northern Gulf of Mexico provides both a stratigraphic foundation for some ∼15-km-thick overlying Mesozoic and Cenozoic deposits, and a coeval pre-salt equivalent for southern synrift deposits, in one of the most economically significant hydrocarbon basins in the world. This study presents more than 3200 new detrital zircon U-Pb analyses from sixteen Late Triassic pre-salt, siliciclastic, subcrop well samples, and combines over 14,000 linear kilometers of 2-D multi-channel seismic reflection data, 1511 geophysical well logs, and biostratigraphic data from 2478 wells to construct basin-scale pre-salt isochore and structure maps spanning the northern Gulf of Mexico margin from Florida to the USA-Mexican border.The data show that incipient Gulf of Mexico paleodrainage pathways held individual distinctions between basement sources and tectonic controls in three primary regions across the northern Gulf of Mexico: (1) The western Gulf of Mexico paleodrainage extended from the Central Texas uplift highlands to the submarine Potosi Fan on the western margin of Laurentia with local tributary sources from the East Mexico Arc, Yucatán/Maya, and Marathon-Ouachita provinces as evidenced by inverse Monte Carlo unmixing of peri-Gondwanan (ca. 700–500 Ma), Appalachian/Ouachita (500–280 Ma), Grenville (1250–950 Ma), and Mid-Continent/Granite-Rhyolite Province (1500–1300 Ma) detrital zircon ages. Isochore and associated geophysical well and seismic data suggest that by Early Jurassic time this depocenter had shifted into the present-day western Gulf of Mexico as East Mexico Arc development continued. (2) Southerly drainage in the north-central Gulf of Mexico region bifurcated around the Sabine and Monroe uplifted terranes with southwestern flow characterized by peri-Gondwanan detrital zircon ages from late Paleozoic accreted basement or discrete flexural successor basins, and southeastern fluvial networks distinguished by traditional North American basement province sources including Grenville, Mid-Continent, and Yavapai-Mazatzal. (3) Eastern Gulf of Mexico regional paleodrainage, with regional southern flow dictated by the brittle extensional tectonics of the South Georgia Rift as well as the regional southern flexure of the South Florida Basin, resulted in almost all pre-salt detrital zircon siliciclastic ages from this region to be dominated by local Gondwanan/peri-Gondwanan aged sources including the proximal Suwannee terrane and Osceola Granite complex. These regional, synrift sediment provenance models provide the first critical allochthonous evidence of Late Triassic–Early Jurassic paleodrainage stemming from the Appalachian-Ouachita hinterlands into the incipient northern Gulf of Mexico basin with critical implications for pre-salt hydrocarbon exploration and carbon sequestration reservoir potential.

中文翻译：

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墨西哥湾北部盆地中生代早期的Eagle Mills地层和同时期的硅质碎屑源，汇和沉积物路径

墨西哥湾北部中生代早期盆地的沉积构造和物源仍存在争议，原因是整个美国南部缺乏露头暴露和样品稀缺，且亚露头深度接近6 km。横跨墨西哥湾北部的Eagle Mills地层和近代沉积为大约15 km厚的中生代和新生代上覆沉积提供了地层学基础，同时也为南部同化层沉积提供了相当于前时代的盐下沉积，这是最经济的方法之一世界上重​​要的油气盆地。这项研究提供了来自16个晚三叠纪预盐，硅质碎屑，地下作物样品的3200多个新的碎屑锆石U-Pb分析，并结合了超过14,000线性公里的二维多通道地震反射数据，1511个地球物理测井记录，和大陆中部/花岗岩-流纹岩省（1500-1300 Ma）碎屑锆石年龄。等时线以及相关的地球物理井和地震数据表明，到侏罗纪早期，随着东墨西哥弧的发展，该震源已经转移到了如今的墨西哥湾西部。（2）墨西哥中北部海湾地区的南风分叉，围绕萨宾和门罗隆起的地层，向西南方向流动，其特征是晚古生代基底或离散弯曲后继盆地的冈瓦纳外围碎屑锆石年龄，以及东南河流相网络，其特征是北美地下室的传统资源来源包括格伦维尔，中部大陆和亚瓦派-马扎特。（3）墨西哥东部海湾区域古流域，由于南乔治亚裂谷的脆性伸展构造以及南佛罗里达盆地的区域南部挠曲所决定的区域南部流动，导致该地区几乎所有的盐前碎屑锆石硅质碎屑时代都由当地的冈瓦南/外围地区主导-冈瓦纳（Gondwanan）老化的物源，包括近端的Suwannee地层和Osceola花岗岩复合体。这些区域性的，综合的沉积物物源模型提供了从阿巴拉契亚-瓦希塔腹地进入墨西哥北部湾盆地初期的晚三叠世-早侏罗世古排水的第一个关键的异源证据，对盐下油气勘探和碳固存储层潜力具有重要意义。导致该地区几乎所有的盐前碎屑锆石硅质碎屑时代都被当地的冈瓦南/近旺冈瓦纳年龄较大的来源所控制，包括近端的Suwannee地层和Osceola花岗岩复合体。这些区域性的，综合的沉积物物源模型提供了从阿巴拉契亚-瓦希塔腹地进入墨西哥北部湾盆地初期的晚三叠世-早侏罗世古排水的第一个关键的异源证据，对盐下油气勘探和碳固存储层潜力具有重要意义。导致该地区几乎所有的盐前碎屑锆石硅质碎屑时代都被当地的冈瓦南/近旺冈瓦纳年龄较大的来源所控制，包括近端的Suwannee地层和Osceola花岗岩复合体。这些区域性的，综合的沉积物物源模型提供了从阿巴拉契亚-瓦希塔腹地进入墨西哥北部湾盆地初期的晚三叠世-早侏罗世古排水的第一个关键的异源证据，对盐下油气勘探和碳固存储层潜力具有重要意义。