New Shocked Quartz with High Density from Wolf Creek Impact Crater

Physics

Scientific paper

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Craters, Wolf Creek, Metamorphism, Shock, Quartz, Shock Effects, Waves

Scientific paper

Crystalline parts of fine shocked quartz grains can be discussed the density or structure of impact materials [1]. New type of shocked quartz [2] which reveals "high value" of x-ray diffraction intensity. has been found from only sandstone target-rock of the Wolf Creek meteorite crater. Australia [2,3]. The main purpose of this study is to discuss on new type of shocked quartz with clear high Bragg angle shift and high calculated density formed at impact process. Anomalous shocked quartz sample with trace amounts of Fe. Ni or Ti was collected from the North rim of the crater (No.3), which is chemical relict in vapor plume of impact [2,3]. After correction of minor inclusion in the molecular weight (MW). the x-ray calculated density of anomalous shocked quartz is still high density of about 1% (than standard rock-crystal) as listed in Table 1. where these data were obtained from least square calculation of the highest x-ray intensity peak on each Miller plane [2.3]. Table 1, showing the x-ray calculated density of WC-No. 3 shocked quartz from the Wolf Creek meteorite crater, appears here in the hard copy. Original x-ray data of the shocked quartz are not typical hexagonal cell (in calulation) of a=b axes, but all x-ray data of a is not equal to b. Structural distortion of shocked quartz is larger data in low Bragg angle than in high Bragg angle. as listed in Table 2. This suggests that shocked quartz has slightly long-range periodic structure (beyond the measurement precision) [2,3]. Table 2, showing the changes of x-ray data and unit-cell parameters of anomalous shocked quartz (WC3) from the Wolf Creek meteorite crater, appears here in the hard copy. Atomic structure of the anomalous shocked quartz is also shrinkage. In fact. shock planes of (101), (010), (110), (111), and (012) are short in plane distance than the normal those (i.e. -7.7%, -2.8%, .8%, -0.2%. respectively). Although shocked quartz of the crater reveals various textures of mixing of Fe-Ni, flow-mantle. wormy bubble, and simple shock lamellae with bubble textures, but there are few shock quartz with multiple shock lamellae in the Wolf Creek meteorite crater [2.3]. Therefore, the anomalous shocked quartz with high-density and high Bragg angle shift is obtained by average structure of shocked quartz with long-range disorder structure, which is considered to be formed by recrystallization during or after impact event mixed in vapor plume [4] (i.e. shock retamorphic evolution [2,3]). References: [1] Miura Y.(l991) Shock Waves. 1. 135-141. [2] Miura Y. et al.(1995): Shock Waves Japan (Yokohama), 4. 621-624. [3] Miura Y. et al.(1995): Antarctic Meteorites (NIPR). 20. 166-168.

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