南澳大利亚 Wirrealpa 灰岩(寒武纪第 4 阶段)微生物堆积层中的微观结构和脉状硬岩

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Hao Yun , Xingliang Zhang , Joachim Reitner
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引用次数: 0

摘要

在南澳大利亚的 Wirrealpa 石灰岩(寒武纪第 2 系第 4 阶段)中发现了保存完好的独特柱状微生物岩。然而,要揭示这些微生物岩的微观结构和形成过程,还需要进一步的研究。本文研究的 Wirrealpa 灰岩中的微生物堆积表明,微生物岩柱是由微生物产生的密集分布、多形态和斑块状织物组成的。这些结构由以钙质元古宙骨架和脑敖包虫为特征的包岩沉积物相互镶嵌而成。斑块织物可分为三种类型:1)层状 "斑块";2)均质微石英质 "斑块"(mesoclots);3)胶结 "斑块",内含紧密堆积的鹅掌状硬壳。壳斗硬岩有两种保存条件。居住在微生物礁之间或附近的硬壳虫个体(属于硬壳虫属和罕见的全缘虫属)死亡后,大量硬壳虫被剥落、运输和集中。然后,其中一些被微生物群落固结,形成第三类 "斑块",另一些则与许多三叶虫和软体动物的骨骼碎片一起堆积在礁石空腔和框架间隙的包石中。因此,这个下寒武纪的血栓岩-叠层石复合体是在一个缺乏古脊椎动物,但以微生物(礁石建造者)和腔肠动物(礁石居住者)为主的生态系统中形成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure and chancelloriid sclerites within a microbial buildup of the Wirrealpa Limestone (Cambrian Stage 4), South Australia
Well-preserved, distinctive columnar microbialites were discovered in the Wirrealpa Limestone (Stage 4, Series 2 of Cambrian) of South Australia. However, further studies are still required to unveil the microstructure and formation process of these microbialites. A microbial buildup from the Wirrealpa Limestone examined herein suggests that the microbialitic columns are composed of densely-distributed, polymorphic, and patched fabrics produced by microbes. These fabrics are inter-framed by packstone sediments that characterized by calcareous metazoan skeletons and cerebroid ooids. The patched fabrics can be categorized into three types: 1) laminated ‘patches’, 2) homogeneous microsparitic ‘patches’ (mesoclots), and 3) cemented ‘patches’ containing tightly-packed chancelloriid sclerites. There are two preservational conditions of chancelloriid sclerites. After death of the chancelloriid individuals (belonging to Chancelloria and rare Allonnia) that dwelled among or near the microbial reef, abundant sclerites were exfoliated, transported, and concentrated. Then, some of them were cemented by microbial communities, forming the third type ‘patches’, while others were accumulated in the packstones within reefal cavities and inter-framework space along with many skeletal fragments from trilobites and mollusks. Thus, this lower Cambrian thrombolite-stromatolite complex was formed within an ecosystem lacking archaeocyaths but dominated by microbes (reef builders) and chancelloriids (reef dwellers).
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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