EXCEPTIONAL PRESERVATION OF MACROFOSSILS FROM THE EDIACARAN LANTIAN AND MIAOHE BIOTAS, SOUTH CHINA
EXCEPTIONAL PRESERVATION OF MACROFOSSILS FROM THE EDIACARAN LANTIAN AND MIAOHE BIOTAS, SOUTH CHINA
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中国南部埃迪卡拉蓝田和庙河生物群的宏观化石保存完好
DOI：
10.2110/palo.2013.085
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发表时间：
2014-06
期刊：
影响因子：
1.6
通讯作者：
Yuan, Xunlai
中科院分区：
文献类型：
--
作者：
Tang, Qing;Chen, Xiang;Chen, Zhe;Yuan, Xunlai
埃迪卡拉纪蓝田和庙河生物群是中国已知最早的具有宏观和形态复杂生命形式的化石组合。这些大型化石的保存被描述为黑色页岩中的碳质压缩。然而，对其保存方式的详细研究尚缺乏。研究了蓝田和庙河生物群中未风化和风化大型化石的保存情况。结果表明，虽然苗河和苗田的一些宏观化石被保存为碳质压缩物，缺乏铝硅酸盐粘土的富集，但蓝田和苗田的许多宏观化石被保存为碳质压缩物，与密集堆积的草莓状黄铁矿有关，黄铁矿的损失在风化标本中留下了簇状的空洞。黄铁矿化可能是在生物广泛降解和三维形态丧失之后才发生的。蓝田化石中的黄铁矿树状体明显大于邻近基质中的黄铁矿树状体，表明其氧化还原条件不同。
ABSTRACT The Ediacaran Lantian and Miaohe biotas (South China) are among the earliest-known fossil assemblages with macroscopic and morphologically complex life forms. Preservation of these macrofossils has been described as carbonaceous compressions in black shales. However, detailed study of their mode of preservation is lacking. We investigated the preservation of unweathered and weathered macrofossils from the Lantian and Miaohe biotas. Our results show that although some Miaohe and Lantian macrofossils are preserved as carbonaceous compressions lacking any enrichment of aluminosilicate clays, many Lantian and Miaohe macrofossils are preserved as carbonaceous compressions associated with densely packed framboidal pyrite, the loss of which leaves clustered cavities in weathered specimens. Pyritization probably did not happen until after extensive degradation of organisms and loss of three-dimensional morphology. Pyrite framboids in Lantian fossils are significantly larger than those in the adjacent matrix, implying different redox conditions.
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