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In the center of the eastern Yellow River coalfield cosmic spherules being found at first in late Paleozoic coal-bearing series and its features


In the center of the eastern Yellow River coalfield cosmic spherules being found at first in late Paleozoic coal-bearing series and its features



Acta Sedimentologica Sinica 8(1): 99-105



Cosmic spherules is an important material from the solar system. We found sedimentary cosmic spherules in the rocks of Late Palaeozoic coal-bearing series of the eastern Yellow River Coalfield, while studying the sedimentation of the coalfield with binoculars and scanning electronic microscope. The surface features of micro-textures being found are as follows: irregular holocrystallines, miarolitic, resortive, warty, calaclastic spherulitic, hollow-prism and plicated structure, totalling 8 types. According to the chemical compositions measured by electronic probing, there are three kinds of cosmic spherules such as glassy, silicate and ferrous spherules in this district. This is similar to the cosmic spherules which have been reported in the chemical compositions. The content of Ir (being called as "dactylotype element") is high, up to 1.09%, in the ferrous cosmic sphyerules. The fact that Ir is found so much in the spherules has proved that the spherules is really a kind of of extraterrestrial material. Studying cosmic spherules contributes to knowing the originality and evolution of solar system and the cause of extinct or degenevation of creatures. Meanwhile, it has widely been used in cosmography, astronautics, oceanography, physics, astronomic geology and geological exploration and so on.

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