| 摘要: |
| 超高压变质杂岩成因模式的关键是折返机制的解释,笔者将天文事件作为一种地球动力学模式来解释超高压变质杂岩的成因,较好地阐明了这个关键问题。该“天文模式”认为超高压变质杂岩分形成、折返和剥露三个阶段形成。天体撞击陆壳所产生的高温高压形成超高压变质杂岩;撞击后新的动力平衡使陆壳重熔的片麻岩里携超高压变质杂岩沿撞击形成的压力薄弱部位向地表折返运移;后期表层的剥蚀使超高压变质杂岩剥露。 |
| 关键词: 天文事件 超高压变质杂岩 |
| DOI： |
| 附件 |
| 投稿时间：1999-07-30 |
| 基金项目: |
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| Astronomical events and geodynamic model for the generation mechanisms of ultrahigh-pressure metamorphic rocks |
| FU Heng, SONG Shan-lin, QIN Tian-xi, HAO Ji-peng, HU Beichen |
(1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China;
2. Northwest China Bureau of Petroleum, Urumqi 830011, Xinjiang, China) |
| Abstract: |
| The key problem for the geodynamic model for the generation mechanisms of the ultrahigh-pressure metamorphic rocks is the explanation of the exhumation mechanism. In this paper the astronomical events are presented as a kind of geodynamic model to interpret the genesis of the ultrabigh-pressure metamorphic rocks.According to this “astronomical model”,the ultrahigh-pressure metamorphic rocks record three phases of formation,return and exhumation.These rocks tend to be generated under the high-temperature and high-pressure crustal conditions created by the impact of celestial bodies.The resultant new dynamic equlibrium allows for the return and migration of the remelted gneiss within the crust together with the ultrahigh-pressure metamorphic rocks upwards to the surface along the low-pressure fractured channels caused by the impact of celestial bodies.The ensuing subaerial erosion in the late stages is believed to be the main cause for the exhumation of the ultrahigh-pressure metamorphic rocks. |
| Key words: astronomical event ultrahigh-pressure metamorphic rock |
