Full
Outline
The factors of collision and shear stress in the coesite formation has not been considered in the condition of high static pressure that was the base of the hypothesis of subduction-return of slab in the Earth. After considered these factors, a laboratory method of combining the high-energy mechanical ball milling (HEMBM) and high static pressure was suggested in this paper for modelling synthesis of coesite in the Earth's crust. A mechanical collision-induced intermediate phase of α-quartz has been discovered. Its condition of easily crystallizing into coesite induced by high static pressure is 3.0 GPa, 932 K, and < 1.0 min. The Raman peaks for the coesite synthesized by the present method have covered over the all information of those natural and synthesized coesite obtained before. This implicated that the coesite in the Earth's crust and subduction-return of slab maybe not come from as deep as common accepted value because of its lower pressure 3.0 GPa than that suggested by Jr. L. Coes. However, according to the fact discovered in this paper that the coesite could be synthesized under a condition of very short time (about 10 s) by the high static pressure after pre-treated of HEMBM, the intermediate phase of α-quartz could be transformed into coesite instantaneously by the interaction of an earthquake wave and/or stress. Therefore we suggest some other possible formation mechanisms for coesite in the Earth's crust and show that the coesite in the Earth's crust could record some information about the collision dynamics of plates and an earthquake wave.
20
3
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
