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首页> 外文期刊>Facies >New contributions to the palaeoenvironmental framework of the Los Molles Formation (Early-to-Middle Jurassic), Neuquen Basin, based on palynological data
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New contributions to the palaeoenvironmental framework of the Los Molles Formation (Early-to-Middle Jurassic), Neuquen Basin, based on palynological data

机译：基于Palynology数据，Los Molles Chormation（早期侏罗纪）的古环境框架的新贡献

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摘要

Being the main oil-bearing basin of Argentina, the Neuquen Basin contains a well-documented stratigraphic record of continental and marine sedimentation during the Jurassic and Cretaceous in the western margin of Gondwana. Marine sedimentation started in the Early Jurassic with the deposition of the offshore to prodelta shales of the Los Molles Formation, the basal unit of the Cuyo Group. A palynological study of outcrop samples of the Los Molles Formation at two localities, Puente Picun Leufu, southern Neuquen Basin, and Cordillera del Viento, central basin area, is presented. The palynological evidence allows inferring two different palaeoceanographic contexts during the deposition of the Los Molles Fm. At Puente Picun Leufu and the lower part of the Cordillera del Viento localities, the record of acritarchs and prasinophytes suggests a stratified water column, suboxic-to-anoxic bottom conditions, and a reduced salinity within the photic zone, associated with a marginal marine environment under restricted oceanic circulation. These conditions would have last at least until the Early Bajocian. Conversely, at the middle and mainly the upper part of Cordillera del Viento locality, the predominance of dinocysts in the assemblages indicates a hydrographically unstable shelf (non-stratified water mass column) with well-oxygenated bottom waters developed under open-marine settings with non-restricted oceanic circulation. The abundance and diversity of dinocyst assemblages are comparable with those observed in the Late Callovian Lotena Formation. These evidences suggest an open oceanic circulation due to the establishment of different seaways in the Neuquen Basin, during the final accumulation of the Los Molles Formation (Early Callovian).
机译：Neuquen盆地是阿根廷的主要储油盆地，含有在侏罗纪和白垩纪的巨大和海洋沉积在吉拉尼斯和Cretape的Gondwana的内部沉积物。海洋沉积在早期的侏罗纪开始，沉积海上到Prodelta Shales的Los Molles形成，Cuyo组的基底单位。提出了对洛杉矶莫尔斯组成的露头样本的腭积研究，普华斯·佩恩·雷福，Neuquen盆地南部的Neuquen盆地和Cordillera del Viento，中央盆地地区。术语证据允许在锁定LOS蒙布斯FM期间推断出两种不同的古英语语境。在Puente Picun Leufu和Cordillera del Viento地区的下半部分，刺激群体和普罗基因糖的记录表明，与边际海洋环境相关的光区内的分层水柱，对缺氧底部条件和降低的盐度在受限制的海洋循环下。这些条件至少持续到早期的Bajocian。相反，在中间和主要是Cordillera del Viento局部的上部，DinoCysts在组装中的优势表明了一种随着氧化底部水域的水DinoCysts的优势表明，在开放的海洋环境下开发出的良好氧气底部水域 - 将海洋循环。 DinoCyst组合的丰富和多样性与晚点议会Lotena形成中观察到的那些相当。这些证据表明，由于洛杉矶莫尔斯形成的最终积累期间，由于Neuquen盆地的最终积累（早期Callovian），由于建立了不同的海洋，因此开放的海洋循环。

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