Preliminary elemental analysis of fossil insects from the Middle Jurassic of Daohugou, Inner Mongolia and its taphonomic implications |
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Authors: | Bo Wang JianFeng Li Yan Fang HaiChun Zhang |
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Institution: | (1) State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China;(2) Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;(3) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China |
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Abstract: | Fossil insects from the Middle Jurassic of Daohugou, Inner Mongolia were investigated using Scanning Electron Microscope (SEM)
for the first time, and portions and distribution of some elements in compression and pyrited fossils were also revealed by
X-ray Energy Dispersive Spectroscopy (EDS) attached to SEM. Most of compression fossil insects from the Daohugou Biota are
preserved in organic remains (diagenetic products of the original organic components). A small part of compression fossils
retain a comparatively high Fe concentration which probably resulted from the absorption of Fe by biopolymers during the decaying
period. Pyritized insect fossils suggest that the “fossil envelop” model found in the Early Cretaceous Jehol Biota probably
also occurs in the Daohugou Biota. Different preservation modes show various mechanisms of fossilization, and also suggest
that several different microenvironments are present in Daohugou palaeolakes.
Supported by National Basic Research Program of China (Grant No. 2006CB806400), National Natural Science Foundation of China
(Grant Nos. 40872015, 40523004, 40632010), and Special Fund for Graduates in the Graduate University of the Chinese Academy
of Sciences |
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Keywords: | Inner Mongolia Middle Jurassic Daohugou fossil insects taphonomy |
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