書誌事項
- タイトル別名
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- Earliest Cambrian fossil embryos and their fossilization processes and paleoceanographic background
- カンブリアキ サイゼンキ ハイカセキ ノ カセキカ カテイ ト コカイヨウテキ ハイケイ
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抄録
Paleontological, petrological and geochemical studies from the Kuanchuanpu Formation in southern Shaanxi Province, strata known for the earliest Cambrian animal embryos, revealed the paleoceanographic settings and processes permineraling an exceptionally rich fauna. Lack of highenergy sedimentary structures and presence of fossilized photosynthetic microbes indicated that a calm and shallow depositional environment was developed on the northern marginal Yangtze platform. The upward-decreasing trend of reductive elements (Mn and Fe) in carbonate fraction indicated a gradual transition to oxic conditions, which allowed animals to inhabit during the deposition of the upper Kuanchuanpu Formation. The animal embryos and small shelly fossils were permineralized by apatite due to intensified upwelling that rose the concentration of phosphates in the bottom water. The intensified upwelling was probably responsible for the upward-decreasing trend of the carbonate δ^<13>C values. The permineralization selectively proceeded in the organic lipid membranes that were resistant against decomposition. The lowered pH, locally developed by bacterial activities inside the embryos was another potential factor for the precipitation of apatite.
収録刊行物
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- 化石
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化石 84 (0), 5-17, 2008
日本古生物学会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390282679412351104
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- NII論文ID
- 110006967284
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- NII書誌ID
- AN00041606
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- ISSN
- 24242632
- 00229202
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- NDL書誌ID
- 9687416
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可