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首页> 外文学位 >Late Devonian stratigraphy, stable isotopic analyses, and paleoecology in the Napier, Oscar, and Emanuel Ranges, Canning Basin, Western Australia.
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Late Devonian stratigraphy, stable isotopic analyses, and paleoecology in the Napier, Oscar, and Emanuel Ranges, Canning Basin, Western Australia.

机译：西澳大利亚州坎宁盆地纳皮尔，奥斯卡和伊曼纽尔山脉的晚泥盆世地层学，稳定的同位素分析和古生态。

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摘要

The Canning Basin contains excellent exposures of Frasnian and Famennian reefs, from which models of Upper Devonian reef development can be developed. Facies distribution and composition of these reefs record interactions among sea level changes, sediment supply, ocean chemistry, and paleoecology. Biostratigraphy, sequence stratigraphy and, carbon isotope stratigraphy allow the regional correlation of strata across facies boundaries. Results demonstrate that sea level-driven, carbonate-siliciclastic reciprocal sedimentation at Windjana Gorge correlates to spatial shifts in reef facies in the Oscar Range and Dingo Gap. Transgressive intervals correspond to positive carbon-isotopic excursions within the Canning Basin and can be correlated to time-equivalent carbon isotopic curves from Europe and Canada.; Following the Frasnian-Famennian mass extinction, Famennian reefs were constructed primarily by microbial framestones and bindstones. The morphology and distribution of the microbial communities were controlled by their physical environment. Fenestral stromatolites and porous thrombolites formed in high energy, reef-flat environments. These microbial textures are associated with very coarse grainstone and truncation surfaces, suggesting proximity to sea level. The reef-margin subfacies contains mounds of porous thrombolites, which are more delicate than reef-flat thrombolites, suggesting lower wave energy. Deep-water reefal-slope environments had delicate microbialites composed mostly of Rothpletzella with abundant stromatactis pores.; Renalcids, an enigmatic group of encrusting fossils, are reinterpreted as calcifying biofilms. In the Canning Basin, renalcids grew downwards in cryptic reef environments, such as the undersides of laminar stromatoporoid and within the pores of microdigitate thrombolites. The micritic chambers of the renalcids, Shuguria and Izhella, have carbon isotope values 0.3–1.8‰ lower than contemporaneous early marine cements, suggesting incorporation of respired CO2 into the micrite. Based on growth environment and carbon-isotope geochemistry, renalcids are neither fossilized cyanobacteria nor marine algae. Renalcids may be fossilized biofilm clusters, which calcified due to heterotrophic bacterial activity following pulses of rapid biofilm growth.
机译：坎宁盆地含有丰富的弗拉斯尼亚礁和法门尼亚礁，可从中开发上泥盆统礁发育模型。这些珊瑚礁的相分布和组成记录了海平面变化，沉积物供应，海洋化学和古生态之间的相互作用。通过生物地层学，层序地层学和碳同位素地层学，可以实现跨相边界的地层区域相关性。结果表明，Windjana峡谷的海平面驱动的碳酸盐-硅质碎屑倒向沉积与奥斯卡山脉和丁戈峡的礁岩相的空间变化有关。海侵间隔对应于坎宁盆地内的正碳同位素偏移，并且可以与来自欧洲和加拿大的时间等效碳同位素曲线相关。弗拉斯曼－法门尼族大灭绝之后，法门尼亚礁石主要是由微生物的框架石和黏结石构成的。微生物群落的形态和分布受其物理环境控制。在高能，珊瑚礁平坦的环境中形成了Fenestral叠层石和多孔血栓石。这些微生物的质地与非常粗糙的花岗石和截断表面有关，表明接近海平面。礁边缘亚相包含成堆的多孔闪石，比扁礁闪石更为细腻，表明波能较低。深水暗礁环境具有微细的微辉石岩，主要由 Rothpletzella 组成，具有丰富的层间孔。 Renalcids，一层复杂的化石，被重新解释为钙化生物膜。在坎宁盆地，肾脏类动物在隐蔽的礁石环境中向下生长，例如层状叠层多孔体的下侧和微指状血栓石的孔隙内。肾胞的微缩腔 Shuguria 和 Izhella 的碳同位素值比同期的早期海洋胶结物低0.3-1.8‰，表明掺入了呼吸的CO 2 < / sub>放入micrite。根据生长环境和碳同位素地球化学，肾病既不是化石蓝藻也不是海藻。肾上腺皮质激素可能是生物膜化石簇，由于生物膜快速生长的脉冲后异养细菌的活动而钙化。

著录项

  • 作者

    Stephens, Nathaniel Patrick.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Geology.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 280 p.
  • 总页数 280
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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