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Integrated stratigraphy of Pliensbachian and Toarcian strata from the northern Neuquén Basin, Argentina 阿根廷内乌肯盆地北部普利恩巴赫和托阿尔地层的综合地层学

IF 2.1 3区地球科学 Q1 GEOLOGY

Newsletters on Stratigraphy

Pub Date : 2024-07-18 DOI: 10.1127/nos/2024/0817

M. Storm, S. Hesselbo, H. Jenkyns, M. Ruhl, A. Al-Suwaidi, Lawrence M. E. Percival, T. Mather, S. Damborenea, M. Manceñido, A. Riccardi

. The Toarcian Oceanic Anoxic Event (T-OAE, ~183 Ma) was marked by globally recognized environmental perturbations, most notably disturbances to the global carbon cycle and climate. To date, geo-chemical records providing information about the T-OAE have been largely generated from the warm temperate climate zone of the NW European realm. Coeval geochemical records from the Southern Hemisphere, providing a more global perspective on palaeoenvironmental changes associated with the T-OAE, are comparatively scarce. In this study, we present a biostratigraphically calibrated litho-and chemostratigraphic record of Lower Jurassic strata from the northern Neuquén Basin, Argentina, covering the Upper Pliensbachian and Toarcian upper tenuicostatum to lower Dumortieria Andean ammonite zones, equivalent to the upper-most tenuicostatum to pseudoradiosa European standard zones. The integrated stratigraphic data re-define the stratigraphic position of the Andean tenuicostatum–D. hoelderi ammonite Zone boundary and support near-synchroneity of this horizon with the tenuicostatum – serpentinum zonal boundary in NW Europe. The stratigraphic interval recording the negative carbon-isotope excursion associated with the T-OAE appears massively expanded and organic lean in contrast to the coeval organic-rich deposits in other parts of the Neu-quén Basin and in European sections. At Las Overas, persistent sedimentary organic-matter enrichment was limited to brief intervals of black-shale deposition, possibly coinciding with reduced sedimentary organic matter dilution. Depositional rates and inorganic redox proxies suggest that the development of oxygen-de-pleted conditions may have been disrupted by the interplay between basin subsidence, sedimentation rate, relative sea-level change

.托阿克洋缺氧事件（T-OAE，约 183 Ma）的特点是全球公认的环境扰动，其中最主要的是对全球碳循环和气候的扰动。迄今为止，提供 T-OAE 信息的地球化学记录主要来自欧洲西北部的暖温带气候区。来自南半球的同时期地球化学记录则相对稀缺，而这些记录可以提供与 T-OAE 相关的古环境变化的全球视角。在这项研究中，我们展示了阿根廷内乌肯盆地北部下侏罗世地层经生物地层学和化学地层学校准的记录，涵盖了上普利恩巴赫期和托阿尔期的上tenuicostatum至下Dumortieria安第斯氨虫区，相当于上tenuicostatum至pseudoradiosa欧洲标准区。综合地层数据重新定义了安第斯tenuicostatum-D. hoelderi氨石区边界的地层位置，并支持该地层与西北欧tenuicostatum-serpentinum区边界接近同步。记录与 T-OAE 相关的负碳同位素偏移的地层区间出现大规模扩张，有机质贫乏，与内乌肯盆地其他地区和欧洲地段同时期富含有机质的沉积形成鲜明对比。在 Las Overas，沉积有机质的持续富集仅限于黑色页岩沉积的短暂时间段，这可能与沉积有机质稀释程度降低有关。沉积速率和无机氧化还原代用指标表明，含氧贫化条件的发展可能受到了盆地沉降、沉积速率、相对海平面变化之间相互作用的干扰。

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引用次数: 0

Conodonts in Biostratigraphy. A 300-million-years long journey through geologic time 生物地层学中的齿孔动物。长达 3 亿年的地质时间之旅

IF 2.1 3区地球科学 Q1 GEOLOGY

Newsletters on Stratigraphy

Pub Date : 2024-07-01 DOI: 10.1127/nos/2024/0822

Carlo Corradini, Charles M. Henderson, James E. Barrick, Annalisa Ferretti

引用次数: 0

Composite ages of pelagic clay enriched in rare-earth elements in the Pacific Ocean based on Sr isotope chemostratigraphy and ichthyolith biostratigraphy 基于锶同位素化合地层学和鱼类石生物地层学的太平洋富含稀土元素的浮游粘土的复合年龄