A MODEL FOR ORGANIC FOSSILIZATION OF THE EARLY CRETACEOUS JEHOL LAGERSTÄTTE BASED ON THE TAPHONOMY OF “EPHEMEROPSIS TRISETALIS”
A MODEL FOR ORGANIC FOSSILIZATION OF THE EARLY CRETACEOUS JEHOL LAGERSTÄTTE BASED ON THE TAPHONOMY OF “EPHEMEROPSIS TRISETALIS”
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DOI：
10.2110/palo.2013.119
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
Yan-Hong Pan;J. Sha;F. Fürsich
中科院分区：
文献类型：
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作者：
Yan-Hong Pan;J. Sha;F. Fürsich
摘要利用辽西四合屯地区下白垩统义县组3次高分辨率（mm ~ cm）地层发掘中获得的不同类型的蜉蝣化石，系统研究了蜉蝣幼虫的埋藏途径。研究的所有化石都在三维或二维上完全铰接，这表明腐烂在外骨骼脱位之前的某个阶段就已终止。我们的结论是，热河有机骨架代表至少两种一般类型的保存所产生的黄铁矿化和崩溃/压缩，分别。二维压缩没有显示自生矿物的证据，但三维保存的化石全部或部分黄铁矿化。我们的研究还表明，铝硅酸盐粘土和黄铁矿矿化密切相关的化石“Ephemeropsis trisetalis”，这表明粘土和黄铁矿在湖相化石沉积中发挥了重要作用，如在一些海洋化石Lagerstätten。通过对“三毛蜉蝣”埋藏学的研究，提出了热河Lagerstätte有机组织埋藏的一般模式。
ABSTRACT The taphonomic pathways of “Ephemeropsis trisetalis” nymphs (mayfly larvae) were systematically investigated based on fossils of different preservational types, collected during three high–stratigraphic-resolution (mm to cm) excavations in the Lower Cretaceous Yixian Formation in the Sihetun area of western Liaoning, China. All fossils studied are fully articulated either in three or two dimensions, which indicates that decay was terminated at a stage before the exoskeleton became disarticulated. We conclude that the Jehol organic skeletons represent at least two general types of preservation produced by pyritization and collapse/compression, respectively. The two-dimensional compressions show no evidence for authigenic minerals, but the three-dimensionally preserved fossils are wholly or partially pyritized. Our study also indicates that aluminosilicate clay and pyrite mineralization are closely associated with fossil “Ephemeropsis trisetalis” nymphs, suggesting that both clay and pyrite played important roles in lacustrine fossil preservations, as in some marine fossil Lagerstätten. We propose a general model for organic tissue fossilization in the Jehol Lagerstätte based on study of taphonomy of “Ephemeropsis trisetalis” nymphs.