Cosmic Spherules from Changzhogou Formation Changcheng System, Precambrian of North China
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    Abstract:

    Cosmic spherules were discovered among artificial heavy mineral grains in Changzhogou formation, Taoyuan, Lunxian;Changzhogou, Jixian of Hebei and the Ming Tombs, District of Beijing. Precambrian conglomerates and sandstones are one hosted rocks of cosmic spherules. Characteristics of surficial texture and compositions of cosmic spherules are similar to the recent deep-sea cosmic spherules.The spherules generally can be divided into three kinds: ferric, silicateferric and silico-glassy, but the most of them is ferric. Cosmic spherules are formed as globular, spheriod, droplet and hollow spherule etc. Commonly globular iron spherules are characterized by distinctive surficial texture, for example, wrinkled, impact crater, air hole, droplet and double colour sphere. The diameters of spherules range from 0.064 to 0. 27 mm. They are opaque spherules with black, metallic, luster, strong magnetic, friability and fracture uneven, but silicate-iron cosmic spherules are unknown in these area.Interior texture of the spherules can be divided into core, solid spehrule and hollow spherule. The core generally is made of Fe-Ni, but Some core of spherules without Ni. One of the characteritics is different distribution of elements in core and crust of spherules.Author supposed that most of the cosmic spherules might be the droplets sprayed from the fusion crust of a meteorite as it ablates by grazing in atmo sphere.

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刘仲秋,1988,北方前寒武纪长城系常州沟组的宇宙尘[J].岩石矿物学杂志,7(4):325~332. Liu Zhongqiu,1988,Cosmic Spherules from Changzhogou Formation Changcheng System, Precambrian of North China[J]. Acta Petrologica et Mineralogica,7(4):325~332.

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