IF 7.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Alexander Wheeler, Ulrich Heimhofer, Joan S. Esterle
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引用次数: 0

摘要

澳大利亚昆士兰州二叠纪时期的沃尔夫冈盆地是由裂谷控制的半地堑形成的,其中蕴藏着大量煤炭资源。最近,利用高分辨率锆石年龄重新校准了澳大利亚东部的古地层,从而有必要重新研究沃尔夫冈盆地相对于标志澳大利亚晚古生代冰期结束的冰川期的沉积时间。我们选择了四个煤层进行古生物学和有机碳同位素分析:沃尔夫冈主煤层、沃尔夫冈上煤层、展望煤层和高里煤层。沃尔夫冈盆地的古地层学得出沃尔夫冈主煤层和上煤层的年龄为 APP3.2(Kungurian-Roadian),Prospect 煤层的年龄为 APP3.3(Roadian 中高层),Gowrie 煤层的年龄为 APP4.2(Wordian)。这表明沃尔夫冈主煤层和上煤层的形成时间早于 P3 冰川期,而 Gowrie 煤层以及可能的 Prospect 煤层则与冰川期同时形成。古植物群落总体上以三裂孢子(Leiotriletes、Microbaculispora、Acanthotriletes)为主,尤其是在沃尔夫岗主煤层和沃尔夫岗上部煤层,但花粉粒(Protohaploxypinus、Scheuringipollenites、Marsupipollenites)在展望煤层和高里煤层的数量有所增加。Gowrie 煤层中的单囊花粉(Plicatipollenites、Cannoropollis)含量也较高。葡萄条带的有机碳同位素显示出微妙的富集,从沃尔夫冈主煤层的平均值-24‰到展望煤层的-23.3‰。高里煤层显示出从-23.2‰到-23.9‰的上断面贫化。这些趋势与现有的记录相当,可能反映了与 P3 冰期有关的向较冷条件的转变,尽管当地的构造和环境制度仍然允许泥炭形成时期的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Palynostratigraphic reassessment of the Permian Wolfang Basin (Queensland, Australia) − implications for climate and timing of coal formation
The Permian-aged Wolfang Basin in Queensland, Australia, formed as a rift-controlled half graben containing significant coal resources. Recently, the use of high-resolution zircon ages has allowed for a recalibration of the eastern Australian palynostratigraphy, necessitating a re-examination of the timing of deposition in the Wolfang Basin relative to the glacial episodes that mark the end of the Late Palaeozoic Ice Age in Australia. Four coal seams were selected for palynological and organic carbon isotope analysis: the Wolfang Main, Wolfang Upper, Prospect and Gowrie seams. Palynostratigraphy from the Wolfang Basin yields an APP3.2 age for the Wolfang Main and Upper seams (Kungurian-Roadian), an APP3.3 age for the Prospect seam (mid-upper Roadian), and an APP4.2 age for the Gowrie seam (Wordian). This indicates the timing of formation of the Wolfang Main and Upper seams preceded the P3 glaciation, whereas the Gowrie and possibly the Prospect seams were contemporaneous with the glaciation. Palynofloras show an overall dominance of trilete spores (Leiotriletes, Microbaculispora, Acanthotriletes), particularly in the Wolfang Main and Wolfang Upper seams, however pollen grains (Protohaploxypinus, Scheuringipollenites, Marsupipollenites) increase in abundance in the Prospect and Gowrie seams. The Gowrie seam also shows a higher abundance of monosaccate pollen (Plicatipollenites, Cannanoropollis). Organic carbon isotopes of vitrain bands show subtle enrichment from a mean of −24‰ in the Wolfang Main seam to –23.3‰ in the Prospect seam. The Gowrie seam shows upsection depletion from –23.2‰ to –23.9‰. These trends are comparable to existing records and may reflect a shift to cooler conditions related to the P3 glaciation, though local tectonic and environmental regimes still allow for periods of peat-formation.
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来源期刊
Gondwana Research
Gondwana Research 地学-地球科学综合
CiteScore
12.90
自引率
6.60%
发文量
298
审稿时长
65 days
期刊介绍: Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.
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