RESEARCH ON IMPACT TECTONICS AND IMPACTITES:STATUS AND PROSPECTS

YOU Zhen-dong; LIU Rong

Volume 14 Issue 1

Mar. 2008

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YOU Zhen-dong, LIU Rong, 2008. RESEARCH ON IMPACT TECTONICS AND IMPACTITES:STATUS AND PROSPECTS. Journal of Geomechanics, 14 (1): 22-36, 21.

Citation:

YOU Zhen-dong, LIU Rong, 2008. RESEARCH ON IMPACT TECTONICS AND IMPACTITES:STATUS AND PROSPECTS. Journal of Geomechanics, 14 (1): 22-36, 21.

Citation:

YOU Zhen-dong, LIU Rong, 2008. RESEARCH ON IMPACT TECTONICS AND IMPACTITES:STATUS AND PROSPECTS. Journal of Geomechanics, 14 (1): 22-36, 21.

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RESEARCH ON IMPACT TECTONICS AND IMPACTITES:STATUS AND PROSPECTS

School of Earth Science, China University of Geosciences, Wuhan 430074, Hubei, China

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Abstract

Abstract

Transient (within 1 second)dynamic high pressures (ca tens of to up to one hundred GPa) and high temperatures (>1500℃)caused by the impact process will eventually result in the development of an astrobleme when a large meteorite impacts the earth's surface, and the surrounding rocks must undergo a special kind of metamorphism called impact metamorphism. The studies of impact tectonics include the following four topics:1. structure and morphology of the impact crater and its formation mechanism; 2. impact metamorphism and impact metamorphic rocks; 3. numerical simulation and experimental calculation of impact tectonics; and 4. economic benefits of impact tectonics. The studies of impact tectonics not only have academc significance but also have actual economic benefits. Vredefort-Witwatersrand in South Africa is one of the oldest impact tectonics and is also famous for its gold-uranium deposits. The Sudbury impact structure in Canada is famous for occurrence of a large syn-impact Cu-Ni deposit. Now oil and gas reservoirs related to post-impact tectonics are being explored for in a number of areas of North America and Central America. In addition, many impactites are used as building materials and many astroblemes become famous resort places, such as the Ries crater in Nordlingen, Germany. Much progress has been made in impact studies in China since the end of the 20th century. The Baisha crater found in Hainan in the early 1990s is known to the world and there are reports on possible craters such as Taihu in Jiangsu, Duolun in Inner Mongolia and Luoquanli near Xiuyan in Liaoning. However these structures remain to be further confirmed. The studies of global impact tectonics show that long-term stable cratons are favorable to discovering impact craters and many craters are hidden beneath Quaternary and older sediments. So satellite-borne photography and geophysical exploration will be effective in determining targets, and on that basis, through strengthening petrological and structural studies, impact craters may be confirmed.
- impact tectonics,
- impact metamorphism,
- impactite,
- indicator of impact cratering,
- economic geology significance

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致谢: 本文在编写过程中获中国地质科学院地质研究所张泽明研究员主持的国家自然科学基金项目(40272032)的资助。中国地质大学(武汉)RogerMason教授提供了Ries陨石坑冲击岩的显微照片, 特表谢忱。

References(18)

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