• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>SPE Middle East Oil and Gas Show and Conference >Palynological Correlation of the Late Cambrian to Middle Ordovician Saq Formation in Saudi Arabia and Equivalent Strata in Oman Manuscript Title
【24h】

Palynological Correlation of the Late Cambrian to Middle Ordovician Saq Formation in Saudi Arabia and Equivalent Strata in Oman Manuscript Title

机译：在阿曼稿标题中，寒地阿拉伯中冬梦与中奥陶涅师SAQ形成的腭相关

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Cambro-Ordovician succession of Saudi Arabia comprises dominantly siliciclastic sediments deposited in a passive margin intracratonic setting and includes the fluvial to marginal marine Saq Formation (Late Cambrian to early Middle Ordovician), the marine Qasim Formation (late Middle to Late Ordovician) and the glaciogenic Sarah Formation (Hirnantian, latest Ordovician). The Saq Formation is subdivided into the Risha Member (Late Cambrian) and the Sajir Member (Early to Middle Ordovician). Palynological age-control in the Risha Member is provided by a characteristic acritarch assemblage (CB1 Palynozone) which contains well-known Furongian (Late Cambrian) diagnostic taxa (e.g., Trunculumarium revinium, Timofeevia phosphoritica and Ninadiacrodium dumontii), as recorded in one subsurface locality in the Arabian Gulf. This typical assemblage occurs worldwide in Furongian- aged strata and not only permits a confident age- attribution, but also indicates an open marine facies within the predominantly fluvial to marginal marine lower Saq Formation. In Oman, the same assemblage occurs in the Al-Bashair Member of the Andam Formation. In the lower part of the Sajir Member, one acritarch assemblage characterized by the presence of Acanthodicaodium angustum and Vulcanisphaera spp., was described from a subsurface section in Eastern Saudi Arabia, indicating an earliest Ordovician (Tremadocian) age. This assemblage forms the O6 Palynozone and suggests correlation with the Mabrouk Member of the Andam Formation in Oman. The top of the Sajir Member of the Saq Formation is characterized by mud-rich bioturbated deposits which typically yield a distinct palynological assemblage (O5 Palynozone), characterized by dominance of morphologically distinctive sporomorphs (e.g., Virgatasporites spp., various hilate sporomorphs) and characteristic acritarch species such as ?Clypeolus sp., ?Cymatiosphaera sp., ?Retialetes sp., and Barakella spp. The assemblage is also characterized by the first occurrence of some typical Middle Ordovician acritarch taxa such as Arkonia, Striatotheca, and Frankea. Among the chitinozoan, Siphonochitina formosa is typically represented. The age of this assemblage spans the Dapingian to earliest Darriwilian, in agreement with faunal evidence. The assemblage indicates a marginal marine, restricted paleoenvironment. Virtually identical palynological assemblages occur in Oman in the Saih-Nihayda Formation, considered of late Dapingian to Darriwilian age. More specifically, it is suggested here that the O5 Palynozone of Saudi Arabia permits correlation of the upper Sajir Member of the Saq Formation with the lower, sand-prone, part of the Saih Nihayda Formation in Oman.
机译：沙特阿拉伯的Cambro-OrdiCian继任组包括沉积在被动保证金腹腔内的硅砾沉积物，包括河流的Marginal Marine Saq Chormation（已故寒武纪至早期奥陶诺维安），海洋Qasim形成（中期至后期奥陶涅师）和冰川原子纱拉形成（河流，最新的奥陶语）。 SAQ形成被细分为丽水成员（晚寒武纪）和索尼尔成员（早在中奥陶诺伊人）。 Risha成员中的腭际年龄控制由含有众所周知的Furongian（晚寒武纪）诊断分类群（例如，Trunculumarium revinium，Timofeevia磷酸钠和Ninadiacrodium Dumontii）提供的特征Acritarch组合（CB1 Palynozone）提供，如一个地下局部所记录的在阿拉伯海湾。这个典型的综合集会在全世界发生在芙蓉 - 年龄的地层，而不仅仅是允许自信的年龄归因，而且还表明了一个开放的海洋相对于边际海洋下部SAQ形成。在阿曼，在AndAm形成的Al-Bashair构件中发生相同的组合。在Sajir成员的下部，一种通过acanthodica angustum和vuccanisphaera spp的存在特征的Acritarch组合，其来自沙特阿拉伯东部的地下段，表明了最早的ordovician（Tremadocian）年龄。这种组合形成了O6 Palynozone，并表明与阿曼的Andam形成的Mabrouk成员相关。 SAQ形成的Sajir成员的顶部的特征在于富含泥泥的生物沉积，其通常产生不同的椎间盘突出（O5 Palynozone），其特征在于形态学上独特的孢子素（例如，Virgatasporites SPP。，各种蜂蜜孢子素）和特征Acritarch等物种如？Clypeolus sp。，？cymatiosphaera sp。，？retialetes sp。和barakella spp。该组合的特征还在于第一次出现一些典型的中间奥陶涅迪亚群菌株，如Arkonia，Striatotheca和Frankea。在Chitinozoan中，Siphonochitina Formosa通常表示。这一组织的年龄们与群体证据一致地跨越了Dapingian至最早的Darriwilian。组合指示了边际海洋，限制古环境。几乎相同相同的宫颈组合在阿曼在Saih-Nihayda形成，考虑到Dapingian晚点至Darriwilian时代。更具体地说，在此建议沙特阿拉伯的O5 Palynozone允许SAQ形成的上部Sajir成员与阿曼赛时赛马达达的一部分的较低，易一点。

著录项

相似文献

  • 外文文献
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