北方前寒武纪长城系常州沟组的宇宙尘
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Cosmic Spherules from Changzhogou Formation Changcheng System, Precambrian of North China
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    摘要:

    河北滦县、蓟县、北京十三陵三个地方的常州沟组宇宙尘是在人工重砂的重矿物中发现的,产在古老沉积岩地层中的砾岩和砂岩里,大部分是铁质宇宙尘,形态各异,表面构造多种多样,内部构造各有不同,具Fe—Ni金属,核与壳的化学元素分布不匀匀,化学成分与深海宇宙尘相似。

    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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