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Detrital U-Pb zircon and 40Ar/39Ar muscovite geochronology from Middle Pennsylvanian strata in the Anadarko Basin, Texas Panhandle, USA
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2021-07-17 , DOI: 10.1016/j.palaeo.2021.110573
R. Spencer Hollingworth 1 , Ryan J. Leary 1 , Matthew T. Heizler 1, 2
Affiliation  

The Late Mississippian-Permian Anadarko Basin formed in Texas and Oklahoma, USA as the result of inversion of Neoproterozic and Cambrian rift structures. Subsidence was driven by flexural loading of the Amarillo-Wichita Uplift, and this uplift may represent the easternmost element of the Ancestral Rocky Mountains system. The northwestern part of this basin has generally been interpreted to have been filled by sediment derived from the Ancestral Front Range Uplift, ~475 km to the northwest during the early stages of basin filling. We test this model using U-Pb detrital zircon and 40Ar/39Ar detrital muscovite results from three subsurface samples of the Morrow B sandstone in the northwestern part of the Anadarko Basin. We provide a new maximum depositional age of 310.9 ± 4.9 Ma that indicates the age of the Morrow B to be no older than late Atokan to early Desmoinesian Age (Moscovian), ~10 Myr younger than previously interpreted. In contrast to some previous interpretations, we propose that the most likely source for the sediment in the Morrow B is the Amarillo Uplift to the south. Detrital zircon and detrital muscovite data have age peaks at 900–1300 Ma, 1370 Ma and 1600–1800 Ma corresponding to derivation from Grenville, Granite-Rhyolite and Yavapai-Mazatzal basement provinces, respectively. A dominant detrital zircon peak at 1370 Ma suggests that Mesoproterozoic granites in the Amarillo Uplift were exposed by Middle Pennsylvanian time, and detritus eroded from the Amarillo Uplift dominated the lowstand sediment budget of the Texas Panhandle during this time; small volumes of sediment were likely sourced from the Ancestral Front Range. This study presents the first detrital geochronology data from the subsurface Anadarko Basin and the first detrital muscovite data from late Paleozoic southwestern Laurentia. The results presented here highlight the interpretive power of combined detrital zircon and muscovite datasets.



中文翻译:

美国德克萨斯州狭长地带阿纳达科盆地宾夕法尼亚中部地层碎屑 U-Pb 锆石和 40Ar/39Ar 白云母年代学

晚密西西比-二叠纪阿纳达科盆地形成于美国德克萨斯州和俄克拉荷马州,是新元古代和寒武纪裂谷构造反转的结果。下沉是由阿马里洛-威奇托隆起的弯曲载荷驱动的,这种隆起可能代表了祖先落基山脉系统的最东端。在盆地填充的早期阶段,该盆地的西北部通常被解释为已被来自祖先前沿山脉隆起的沉积物填充,距西北部约 475 公里。我们使用 U-Pb 碎屑锆石和40 Ar/ 39测试该模型Ar 碎屑白云母来自阿纳达科盆地西北部莫罗 B 砂岩的三个地下样品。我们提供了一个新的最大沉积年龄 310.9 ± 4.9 Ma,这表明 Morrow B 的年龄不超过 Atokan 晚期到 Desmoinesian 早期(莫斯科),比以前解释的年轻约 10 Myr。与之前的一些解释相反,我们认为 Morrow B 中沉积物的最可能来源是南部的 Amarillo 隆起。碎屑锆石和碎屑白云母数据在 900-1300 Ma、1370 Ma 和 1600-1800 Ma 的年龄峰值分别对应于来自 Grenville、花岗岩-流纹岩和 Yavapai-Mazatzal 基底省的推导。1370 Ma 的主要碎屑锆石峰表明阿马里洛隆起的中元古代花岗岩在宾夕法尼亚时代中期出露,阿马里洛隆起侵蚀的碎屑在此期间主导了德克萨斯狭长地带的低位沉积物收支;少量沉积物可能来自祖先前沿山脉。这项研究提供了来自地下阿纳达科盆地的第一个碎屑地质年代学数据和来自晚古生代劳伦西亚西南部的第一个碎屑白云母数据。此处显示的结果突出了碎屑锆石和白云母组合数据集的解释能力。这项研究提供了来自地下阿纳达科盆地的第一个碎屑地质年代学数据和来自晚古生代劳伦西亚西南部的第一个碎屑白云母数据。此处显示的结果突出了碎屑锆石和白云母组合数据集的解释能力。这项研究提供了来自地下阿纳达科盆地的第一个碎屑地质年代学数据和来自晚古生代劳伦西亚西南部的第一个碎屑白云母数据。此处显示的结果突出了碎屑锆石和白云母组合数据集的解释能力。

更新日期:2021-08-13
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