A number of hydrocarbon discoveries have been made recently in the Flemish Pass Basin and Central Ridge, offshore Newfoundland, Canada, but there is only limited geological information available. The primary goal of this study was to determine the sedimentary provenance and paleodrainage patterns of mudstones and sandstones from the Upper Jurassic Rankin Formation, including the Upper and Lower Kimmeridgian Source Rock (organic-rich shale) members and Upper and Lower Tempest Sandstone Member reservoirs, in this area. A combination of heavy mineral analysis, whole-rock geochemistry and detrital zircon U-Pb geochronology was determined from cores and cuttings from four offshore wells in an attempt to decipher provenance. Detrital heavy minerals in 20 cuttings samples from the studied geologic units are dominated by either rutile + zircon + apatite ± chromite or rutile + apatite + tourmaline, with minor zircon, indicating diverse source lithologies. Whole rock Zr-Th-Sc trends suggest significant zircon recycling in both mudstones and sandstones. Detrital zircon U-Pb ages were determined in two mudstone and four sandstone samples from the four wells. Five major U-Pb age groups of grains were found: A Late Jurassic group that represents an unknown source of syn-sedimentary magmatism, a Permian–Carboniferous age group which is interpreted to be derived from Iberia, a Cambrian–Devonian group derived from the Central Mobile Belt of the Newfoundland–Ireland conjugate margin, and two older age groups (late Neoproterozoic and >1 Ga) linked to Avalonia. The Iberian detritus is abundant in the Central Ridge and southern Flemish Pass region and units containing sizable populations of these grains are interpreted to be derived from the east whereas units lacking this population are interpreted to be sourced from the northeast and possibly also the west. The Upper Tempest Sandstone contains Mesozoic zircons, which constrain the depositional age of this unit to be no older than Late Tithonian.

中文翻译：

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加拿大近海纽芬兰的佛兰德关口盆地和中央山脊上侏罗统烃源岩的物源研究

最近在加拿大纽芬兰近海的佛兰德关口盆地和中央海岭发现了许多碳氢化合物，但仅有的地质信息有限。这项研究的主要目的是确定上侏罗统兰金组的泥岩和砂岩的沉积物产地和古排水方式，包括上，下基默里底纪烃源岩（富含有机质的页岩）段以及上，下暴风雨砂岩段储层，在这方面。结合重矿物分析，全岩地球化学和碎屑锆石U-Pb地球年代学，从四口近海油井的岩心和岩屑中进行测定，以试图破译物源。来自所研究的地质单元的20个岩屑样品中的碎屑重矿物以金红石+锆石+磷灰石±铬铁矿或金红石+磷灰石+电气石为主，锆石含量较小，表明烃源岩性多种多样。整个岩石的Zr-Th-Sc趋势表明，泥岩和砂岩中锆石的回收率很高。在来自四个井的两个泥岩和四个砂岩样品中确定了碎屑锆石的U-Pb年龄。发现了五种主要的U-Pb年龄年龄组：晚侏罗世组代表同沉积岩浆作用的未知来源，二叠纪至石炭纪年龄组被解释为源自伊比利亚，寒武纪-泥盆纪年龄组来自于伊比利亚。纽芬兰-爱尔兰共轭边缘的中央移动带，以及两个与阿瓦隆有关的较老的年龄段（新元古代晚期和> 1 Ga）。伊比利亚碎屑在中央山脊和佛兰芒山口南部地区丰富，含有这些谷物大量种群的单位被解释为来自东部，而缺乏该种群的单位则被解释为源自东北，也可能来自西部。上部风暴砂岩含有中生代锆石，这限制了该单元的沉积年龄不晚于铁通世晚期。