• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Facies >Palynotaphofacies analysis applied to Jurassic marine deposits, Neuquen Basin, Argentina
【24h】

Palynotaphofacies analysis applied to Jurassic marine deposits, Neuquen Basin, Argentina

机译：Palynotaphofacies分析应用于阿根廷内乌肯盆地的侏罗纪海相沉积

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Taphonomic analysis was performed on palynological samples of marine successions from the Cuyo Group of the Neuquen Basin. The group comprises the Los Molles and Lajas Formations (Middle Jurassic) and represents the first major marine depositional episode after the configuration of the basin. A total of 21 outcrop samples from five sections, located in the central-western part of the basin, were analyzed. The palynological counts of each sample were carried out taking into account the preservation state of the palynomorphs, which was mainly influenced by two parameters: their intrinsic properties and the environmental depositional conditions. Four main deterioration types (corrosion, degradation, mechanical damage, and concealment by authigenic minerals) and their six combinations were identified. The growth of pyrite crystals within the palynomorphs was strongly influenced by the exine structure, being dominant in bisaccate pollen grains. Mechanical damage appears to be the most important deterioration type, reflecting the highly dynamic conditions of shelfal marine environments. The term Palynotaphofacies (Pt) was proposed to characterize a sedimentary rock yielding palynological associations with distinctive preservational features. Three palynotaphofacies have been recognized: Pt-1 (tidal-influenced environments) is characterized by the highest percentage of deteriorated forms, reflecting either intermittent exposure to weathering or intense reworking. Pt-2 shows the highest percentage of well-preserved palynomorphs associated with rapid burial due to a high sedimentation rate and it comes from the delta-front facies of fluvial-dominated deltas. Finally, Pt-3 was identified in samples of prodelta hyperpycnites with a wide predominance of terrigenous components and it is characterized by the coexistence of well-preserved and deteriorated palynomorphs.
机译：对内乌肯盆地库约群海相演替的孢粉学标本进行了组相分析。该组包括Los Molles和Lajas组（侏罗纪中部），代表了盆地构造后的第一个主要海洋沉积事件。分析了位于盆地中西部的五个地区的总共21个露头样本。每个样品的孢粉计数均考虑到了形态的保存状态，这主要受两个参数的影响：其固有性质和环境沉积条件。确定了四种主要的变质类型（腐蚀，降解，机械损伤和自生矿物的掩盖）及其六个组合。黄ly晶内黄铁矿晶体的生长受外在结构的强烈影响，在双花粉的花粉粒中占主导地位。机械损坏似乎是最重要的恶化类型，反映了海洋货架环境的高度动态条件。提出了术语Palynotaphofacies（Pt）来表征沉积岩，该沉积岩产生具有独特保存特征的孢粉学组合。已经认识到三种palynotaphofacacy：Pt-1（受潮汐影响的环境）的特点是变质形式的百分比最高，反映了间歇性暴露于风化或强烈的返工。由于沉积速率高，Pt-2表现出与快速埋葬相关的保存完好的类孢子虫的百分比最高，并且它来自河流主导的三角洲的三角洲前缘相。最后，在原发性高辉石样品中鉴定出Pt-3，其具有大量的陆源成分，并且其特征是保存完好的和退化的粉状体共存。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号