New age constraints on the Lower Jurassic Pliensbachian-Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina).
New age constraints on the Lower Jurassic Pliensbachian-Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina).
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DOI：
10.1038/s41598-022-07886-x
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发表时间：
2022-03-23
影响因子：
4.6
通讯作者：
Hesselbo SP
中科院分区：
文献类型：
--
作者：
Al-Suwaidi AH;Ruhl M;Jenkyns HC;Damborenea SE;Manceñido MO;Condon DJ;Angelozzi GN;Kamo SL;Storm M;Riccardi AC;Hesselbo SP
Pliensbachian-Toarcian界线间隔的特征是在欧洲剖面的有机和无机海洋和陆地档案中，如佩尼切（葡萄牙）和Hawsker Bottoms，约克郡（英国），碳同位素偏移（CIE）为~ 3‰。一个新的高分辨率的有机碳同位素记录，说明相同的化学地层学特征，从南半球阿罗约Chacay Melehue部分，Chos Malal，阿根廷，证实了全球意义的碳循环的干扰。碳同位素的负偏移、汞和有机质的富集伴随着高分辨率的菊石和超微化石生物地层学以及来自夹层火山灰层的U-Pb CA-ID-TIMS年代学。基于高精度U-Pb锆石年代学和贝叶斯马尔可夫链蒙特卡罗（MCMC）地层年龄模型，对Pliensbachian-Toarcian界线和tenuicostatum-serpentinum界线分别进行了新的年龄标定，分别为~ 183.73 + 0.35/− 0.50 Ma和182.77 + 0.11/− 0.15 Ma。
The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment are accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U–Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~ 183.73 + 0.35/− 0.50 Ma for the Pliensbachian–Toarcian boundary, and 182.77 + 0.11/− 0.15 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U–Pb zircon geochronology and a Bayesian Markov chain Monte Carlo (MCMC) stratigraphic age model.
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影响因子：
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作者：
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通讯作者：
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