Using Mesoproterozoic Sedimentary Geochemistry to Reconstruct Basin Tectonic Geography and Link Organic Carbon Productivity to Nutrient Flux from a Northern Australian Large Igneous Province,Basin Research

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Using Mesoproterozoic Sedimentary Geochemistry to Reconstruct Basin Tectonic Geography and Link Organic Carbon Productivity to Nutrient Flux from a Northern Australian Large Igneous Province
Basin Research ( IF 2.8 ) Pub Date : 2020-04-16 , DOI: 10.1111/bre.12450
Bo Yang ₁ , Alan S. Collins _{1,

2} , Grant M. Cox ₁ , Amber J. M. Jarrett _{2,

3} , Steven Denyszyn ₄ , Morgan L. Blades ₁ , Juraj Farkaš ₁ , Stijn Glorie ₁

Affiliation

[Sedimentary geochemistry data demonstrated relatively juvenile, baslatic sources for the upper Kyalla Formation. Weathering of these source rocks resulted an increase of nutrient supply (e.g. phosphorous) to the basin, which further, enhanced the organic carbon productivity. , Abstract The Beetaloo Sub‐basin, northern Australia, is considered the main depocentre of the 1,000‐km scale Mesoproterozoic Wilton package of the greater McArthur Basin – the host to one of the oldest hydrocarbon global resources. The ca. 1.40–1.31 Ga upper Roper Group and the latest Mesoproterozoic to early Neoproterozoic unnamed group of the Beetaloo Sub‐basin, together, record ca. 500 million years of depositional history within the North Australia Craton. Whole‐rock shale Sm–Nd and Pb isotope data from these sediments reveal sedimentary provenance and their evolution from ca. 1.35 to 0.85 Ga. Furthermore, these data, together with shale major/trace elements data from this study and pyrolysis data from previous publications, are used to develop a dynamic tectonic geography model that links the organic carbon production and burial to an enhanced weathering of nutrients from a large igneous province. The ca. 1.35–1.31 Ga Kyalla Formation of the upper Roper Group is composed of isotopically evolved sedimentary detritus that passes up, into more isotopically juvenile Pb values towards the top of the formation. The increase in juvenile compositions coincides with elevated total organic carbon (TOC) contents of these sediments. The coherently enriched juvenile compositions and TOC the upper portions of the Kyalla Formation are interpreted to reflect an increase in nutrient supply associated with the weathering of basaltic sources (e.g. phosphorous). Possible, relatively juvenile, basaltic sources include the Wankanki Supersuite in the western Musgraves and the Derim Derim–Galiwinku large igneous province (LIP). The transition into juvenile, basaltic sources directly before a supersequence‐bounding unconformity is here interpreted to reflect uplift and erosion of the Derim Derim–Galiwinku LIP, rather than an influx of southern Musgrave sources. A new baddeleyite crystallisation age of 1,312.9 ± 0.7 Ma provides both a tight constraint on the age of this LIP, along with its associated magmatic uplift, as well as providing a minimum age constraint for Roper Group deposition. The unconformably overlying lower and upper Jamison sandstones are at least 300 million years younger than the Kyalla Formation and were sourced from the Musgrave Province. An up‐section increase in isotopically juvenile compositions seen in these rocks is interpreted to document the progressive exhumation of the western Musgrave Province. The overlying Hayfield mudstone received detritus from both the Musgrave and Arunta regions, and its isotopic geochemistry reveals affinities with other early Neoproterozoic basins (e.g. Amadeus, Victoria and Officer basins), indicating the potential for inter‐basin correlations.]

中文翻译：

利用中元古代沉积地球化学重建盆地构造地理并将有机碳生产力与澳大利亚北部大型火成岩省的养分通量联系起来

[沉积地球化学数据表明，Kyalla 组上部的玄武质来源相对年轻。这些烃源岩的风化导致盆地的养分供应（例如磷）增加，这进一步提高了有机碳生产力。, 摘要澳大利亚北部的 Beetaloo 子盆地被认为是大麦克阿瑟盆地 1,000 公里规模的中元古代威尔顿盆地的主要沉积中心，麦克阿瑟盆地是全球最古老的碳氢化合物资源之一。约。1.40-1.31 Ga 上罗珀群和 Beetaloo 盆地的最新中元古代至早新元古代未命名群一起记录了大约北澳大利亚克拉通内 5 亿年的沉积历史。来自这些沉积物的全岩页岩 Sm-Nd 和 Pb 同位素数据揭示了沉积物源及其从约 1.35 至 0.85 Ga。此外，这些数据与本研究中的页岩主要/微量元素数据和先前出版物的热解数据一起，用于开发动态构造地理模型，该模型将有机碳生产和埋藏与增强的风化联系起来来自火成岩大省的养分。约。上罗珀群的 1.35–1.31 Ga Kyalla 地层由同位素演化的沉积碎屑组成，向上传递到地层顶部，成为更年轻的同位素铅值。幼鱼组成的增加与这些沉积物的总有机碳 (TOC) 含量升高相吻合。Kyalla 组上部的连贯丰富的幼鱼组成和 TOC 被解释为反映了与玄武岩源（例如磷）风化相关的养分供应增加。可能的、相对年轻的玄武岩来源包括马斯格雷夫斯西部的 Wankanki Supersuite 和 Derim Derim-Galiwinku 大型火成岩省 (LIP)。在超层序边界不整合面之前直接过渡到幼年玄武岩源在这里被解释为反映了 Derim Derim-Galiwinku LIP 的抬升和侵蚀，而不是南部 Musgrave 源的涌入。1,312.9 ± 0.7 Ma 的新斜斜锆石结晶年龄提供了对该 LIP 年龄及其相关岩浆隆升的严格限制，并为 Roper Group 沉积提供了最小年龄限制。不整合覆盖的上下贾米森砂岩至少比 Kyalla 组年轻 3 亿年，并且来自马斯格雷夫省。在这些岩石中观察到的同位素幼年成分的向上增加被解释为记录了西部马斯格雷夫省的逐步挖掘。上覆的 Hayfield 泥岩接收来自 Musgrave 和 Arunta 地区的碎屑，其同位素地球化学揭示了与其他早期新元古代盆地（例如 Amadeus、Victoria 和 Official 盆地）的亲缘关系，表明存在盆地间相关性的潜力。] 在这些岩石中观察到的同位素幼年成分的向上增加被解释为记录了西部马斯格雷夫省的逐步挖掘。上覆的 Hayfield 泥岩接收来自 Musgrave 和 Arunta 地区的碎屑，其同位素地球化学揭示了与其他早期新元古代盆地（例如 Amadeus、Victoria 和 Official 盆地）的亲缘关系，表明存在盆地间相关性的潜力。] 在这些岩石中观察到的同位素幼年成分的向上增加被解释为记录了马斯格雷夫省西部的逐步挖掘。上覆的 Hayfield 泥岩接收来自 Musgrave 和 Arunta 地区的碎屑，其同位素地球化学揭示了与其他早期新元古代盆地（例如 Amadeus、Victoria 和 Official 盆地）的亲缘关系，表明存在盆地间相关性的潜力。]

更新日期：2020-04-16

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