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首页> 外文期刊>Journal of South American earth sciences >Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions
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Mineralogy and geochemistry of deeply-buried marine sediments of the Vaca Muerta-Quintuco system in the Neuquen Basin (Chacay Melehue section), Argentina: Paleoclimatic and paleoenvironmental implications for the global Tithonian-Valanginian reconstructions

机译：Neuquen盆地Vaca Muerta-Quintuco系统的深层埋藏海洋沉积物的矿物学和地球化学矿物学和地球化学沉积物（Chacay Melehue Section）：全球古代和古环境对全球性近海瓦朗尼亚重建的影响

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摘要

The Vaca Muerta-Quintuco (VM-Q) system of Tithonian-early Valanginian age was studied in the Chacay Melehue section of the Neuqu en Basin (western Argentina) by means of sedimentological, mineralogical and geochemical analyses in order to determine the main driving factors that triggered the paleoenvironmental change from a carbonate ramp (Vaca Muerta Formation, VMFm) to a mixed siliciclastic/carbonatic marine environment (Quintuco Formation, QFm). The VMFm was divided into two stratigraphic intervals: Lower VMFm (LVMFm) and Upper VMFm (UVMFm), whereas the QFm is subdivided into the Puesto Barros Member (PBMb) and the Cerro La Visera Member (CVMb), which can be correlated to other sections in the basin (e.g., Puerta Curaco). Isolated, turbiditic sandstone beds, correlated to the Huncal Member, are included in the QFm.The LVMFm (Tithonian) and the UVMFm (Berriasian) are constituted by dark, well-laminated marls, mudstones, calcite concretions and tuffs. The PBMb (earlier early Valanginian) is constituted by marls and sand-stones, whereas the CVMb (later early Valanginian) is constituted by marls, mudstones, siltstones, sandstones and coquinas. The LVMFm (Total organic carbon, TOC similar to 1-4 wt%) is characterized by the enrichment of redox sensitive trace elements (RSTE), where the enrichment of Ni and Cu suggest high productivity in the water column, and the enrichment of Mo, U, V points to sea bottom anoxia, with periods of increased oxygenation as deduced from higher P concentrations in marls and mudstones. The clay mineral association is constituted by mixed-layer illite/smectite formed by the transformation of smectitic layers. The predominance of smectite in coeval sucessions, less overprinted by burial diagenesis, suggests a temperate and semi-arid climate in the adjacent continent. The UVMFm (TOC similar to 1 wt%) is characterized by a gradual decrease of the RSTE pointing to a decrease in productivity and a slight increase in the oxygenation of the sea bottom. In addition, a change towards more humid conditions in the continent is inferred by both the increase in the Chemical Index of Alteration and the Al2O3/TiO2 ratio. The PBMb (TOC similar to 1 wt%) has even lower content of RSTE indicating diminished sea water productivity and a gradual rise of the oxygenation of the sea bottom. In this interval, increased illite contents suggest periods of enhanced physical weathering, probably related to the tectonic uplift of the Huincul Ridge. The RSTE in the CVMb (TOC 1 wt%) documents a fully oxygenated sea bottom, where the productivity of the water column was negligible. The presence of kaolinite and the increment of the detrital sedimentation in the CVMb indicate a change towards more humid conditions in the hinterlands. The enhanced runoff caused by this paleoclimatic change towards more humid conditions that started in the early Berriasian and increased during the later early Valanginian triggered the change from carbonate ramp to mixed siliciclastic/carbonatic to siliciclastic marine paleoenvironments. The organic carbon isotope composition (delta C-13(org) vs. VPDB) of the VMFm ranges between 30.0 and 23.4%, whereas in the QFm values range between 29.0 and -23.9%. Two positive carbon isotope excursions (PCIE) are recorded in the system: PCIE-A in the lower part of the VMFm (early Tithonian) with delta C-13(org) values similar to -25%, and PCIE-B in the upper part of the QFm (later early Valanginian) with delta C-13(org) values similar to -24.5%. The shift in delta C-13(org) at PCIE-B is up to +4.2% and marks the onset of the Weissert Event. This is the first time that the onset of this event is recorded in the Neuqu ' en Basin, within the Lissonia riveroi ammonite zone. The results of our study confirm that clay mineralogy, trace elements and stable isotopes are valuable proxies of past ocean-climate variability even in sediment deposits that underwent near-surface and deep burial diagenesis.
机译：通过沉积物，矿物学和地球化学分析研究了Neuqu En盆地（西阿根廷西部）的Chacay Melehue段的瓦朗尼岛年龄的VACA Muerta-Quintuco（VM-Q）系统，以确定主要的驾驶因素将古环境从碳酸盐斜坡（Vaca muerta形成，VMFM）触发到混合硅淤积/碳船环境（Quintuco形成，QFM）。 VMFM分为两个地层间隔：较低的VMFM（LVMFM）和上部VMFM（UVMFM），而QFM被细分为PueTo Barros成员（PBMB）和Cerro La Vieera成员（CVMB），其可以与其他相互关联盆地中的部分（例如，Puerta Curaco）。隔离的砂岩床与Huncal构件相关的QFM。LVMFM（Tithonian）和UVMFM（Berriasian）由深色，层压的Marls，Mudstones，方解石凝结和凝固物构成。 PBMB（早期的瓦朗尼亚）由Marls和Sand-Stones构成，而CVMB（后续早期的瓦朗伊尼）由Marls，Mudstones，粉砂岩，砂岩和Coquinas构成。 LVMFM（总有机碳，TOC类似于1-4wt％）的特征在于氧化还原敏感痕量元素（RSTE）的富集，其中Ni和Cu的富集表明水柱中的高生产率，以及MO的富集，U，V指向海底缺氧，随着从Marl和Mudstones中的较高P浓度推导出来的氧气增加。粘土矿物结合由混合层illite /蒙脱石构成，由宫氏层的转化形成。蒙脱石在群体成功中的优势较少，埋藏成岩作用叠印较少，尤其是邻近大陆的温带和半干旱气候。 UVMFM（TOC类似于＆ 1wt％）的特征在于RSTE指向生产率降低的逐渐减小，并且海底氧合的略微增加。此外，通过改变的化学指标和Al2O3 / TiO2比例的增加推断出在大陆的更潮湿条件的变化。 PBMB（类似于1wt％）的PBMB（TOC类似）甚至较低的RSTE含量，表明海水生产率减少和海底氧合的逐渐上升。在这种间隔中，增加了Imlite内容的提示了增强的物理风化，可能与Huincul Ridge的构造隆起有关。 CVMB中的RSTE（TOC 1重量％）文件是完全含氧的海底，其中水柱的生产率可忽略不计。高岭石的存在和CVMB中脱滴沉降的增量表明腹地中更潮湿的病症的变化。这种古色细方法变化引起的增强径流朝着早期的Berriasian中开始的更加潮湿的条件，并在早期的valanginian期间增加了从碳酸盐坡道的变化到混合的硅基纤维/碳酸纤维古环境。有机碳同位素组合物（△C-13（有机）相对于VPDB）的范围VMFm 30.0和23.4％之间，而在QFM值的范围之间的29.0和-23.9％。两个正碳同位素偏移（PCIE）被记录在系统：PCIE-A在VMFm（早期提通阶）的与delta C-13（ORG）值相似的-25％的下部，和PCIE-B在上QFM（后续早期valanginian）的一部分具有ΔC-13（ORG）值类似于-24.5％。 PCIe-B的Delta C-13（ORG）的转变高达+ 4.2％，标记Weissert事件的开始。这是第一次在Lissonia Riveroi AmMonite区内的Neuqu'Zen盆地中记录了这一事件的发作。我们的研究结果证实，粘土矿物学，微量元素和稳定同位素是过去海洋气候变异性的有价值代理，即使在沉积物沉积物中，沉积物沉积物沉积物沉积物，也是在接近表面和深埋地的成岩作用。

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  • 来源
    《Journal of South American earth sciences》 |2021年第4期|103103.1-103103.24|共24页
  • 作者

    Capelli Ignacio A.; Scasso Roberto A.; Spangenberg Jorge E.; Kietzmann Diego A.; Cravero Fernanda; Duperron Maria; Adatte Thierry;

  • 作者单位

    Univ Buenos Aires CONICET Inst Geociencias Basicas Aplicadas & Ambientales Intendente Guiraldes 2160 RA-1428 Buenos Aires DF Argentina;

    Univ Buenos Aires CONICET Inst Geociencias Basicas Aplicadas & Ambientales Intendente Guiraldes 2160 RA-1428 Buenos Aires DF Argentina|Univ Buenos Aires Fac Ciencias Exactas & Nat Dept Ciencias Geol Intendente Guiraldes 2160 RA-1428 Buenos Aires DF Argentina;

    Univ Lausanne Inst Dynam Surface Terr IDYST Quartier UNIL Mouline Batiment Geopolis CH-1015 Lausanne Switzerland;

    Univ Buenos Aires CONICET Inst Geociencias Basicas Aplicadas & Ambientales Intendente Guiraldes 2160 RA-1428 Buenos Aires DF Argentina|Univ Buenos Aires Fac Ciencias Exactas & Nat Dept Ciencias Geol Intendente Guiraldes 2160 RA-1428 Buenos Aires DF Argentina;

    Consejo Nacl Invest Cient & Tecn CIC Ctr Tecnol Recursos Minerales & Ceram CETMIC Camino Centenario & 506 RA-1897 Buenos Aires DF Argentina;

    Univ Buenos Aires CONICET Inst Geociencias Basicas Aplicadas & Ambientales Intendente Guiraldes 2160 RA-1428 Buenos Aires DF Argentina;

    Univ Lausanne Inst Sci Terre ISTE Quartier UNIL Mouline Batiment Geopolis CH-1015 Lausanne Switzerland;

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  • 正文语种 eng
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  • 关键词

    Organic carbon isotope composition; Clay minerals; Diagenesis; Paleoredox; Paleoproductivity; Vaca Muerta Formation;

    机译：有机碳同位素组成;粘土矿物质;成岩作用;古罗铁西;古生植造效率;Vaca muerta形成;

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