Earliest Jurassic U-Pb ages from carbonate deposits in the Navajo Sandstone, southeastern Utah, USA
Earliest Jurassic U-Pb ages from carbonate deposits in the Navajo Sandstone, southeastern Utah, USA
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DOI：
10.1130/g46338.1
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发表时间：
2019-11
期刊：
影响因子：
5.8
通讯作者：
J. Parrish;E. Rasbury;M. Chan;S. Hasiotis
中科院分区：
文献类型：
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作者：
J. Parrish;E. Rasbury;M. Chan;S. Hasiotis
对美国犹他州东南部纳瓦霍砂岩碳酸盐沉积物的铀铅（U-Pb）分析结果表明，其年龄分别为200.5 ± 1.5 Ma（最早侏罗纪，Hettangian时代）和195.0 ± 7.7 Ma（早侏罗纪，Sinemurian时代）。这些放射性同位素年龄-首次报道的纳瓦霍erg和最古老的年龄报告为这个形成-是至关重要的了解科罗拉多高原地层，因为他们表明，最初的纳瓦霍砂岩沉积开始后，三叠纪和该单位的基础是强烈的时间海侵至少5.5百万年。
New uranium-lead (U-Pb) analyses of carbonate deposits in the Navajo Sandstone in southeastern Utah (USA) yielded dates of 200.5 ± 1.5 Ma (earliest Jurassic, Hettangian Age) and 195.0 ± 7.7 Ma (Early Jurassic, Sinemurian Age). These radioisotopic ages—the first reported from the Navajo erg and the oldest ages reported for this formation—are critical for understanding Colorado Plateau stratigraphy because they demonstrate that initial Navajo Sandstone deposition began just after the Triassic and that the base of the unit is strongly time-transgressive by at least 5.5 m.y.