| 欧亚大陆东缘存在一个巨型深断裂系统——基于卫星重力的新发现 |
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| 关键词:satellite gravity anomaly fault system Eurasia |
| 基金项目:国家自然科学基金项目(编号: 41574133; 41104061); 国家深部探测技术与实验研究专项(编号: SinProbe-08) |
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| A Huge Deep Fault System at the East Edge of Eurasia: The New Tectonic Interpretation Based on Satellite Gravity |
| Through the subtle processing of satellite gravity data, a regular distribution of gravity anomaly combination was found at the east edge of Eurasia. In order to study geological significance of the combination of these anomalies, the authors adopted gravity inversion based seismic constraints, and the result shows that there exist positive relationships between the discovered gravity anomaly, the uplift of the Moho and the deep fault. According to the gravity anomalies and geological information, the authors found a huge deep fault system at the east edge of Eurasia. The main fault stretches more than 3000 km from Guangzhou northward to the sea of Okhotsk. On the eastern side of the main fault zone, there are 9 parallel faults distributed approximately equidistantly; these faults trend NE and extend to the continental margin into the sea. The authors used numerical simulation method to verify the formation of this fault system: under the horizontal action of force, SN-trending strike slip faults were generated in the east of Eurasian Continent, and then a series of transform fault deep into the lithosphere came into being. In the formation process of the fault system, a large quantity of mantle matter surged upward, resulted in the uplift of Moho, and then triggered massive volcanic- magmatic activities after Mesozoic in eastern China and controlled the distribution of endogenic metallic deposits. The fault system remains active at present, which led to the magnitude 8.5 earthquake in Tancheng and volcanic eruption in the Changbai Mountains. |
| HUANG Zong-li,WANG Dian,YAN Jia-yong,ZHANG Huai.2016.A Huge Deep Fault System at the East Edge of Eurasia: The New Tectonic Interpretation Based on Satellite Gravity[J].Acta Geoscientica Sinica,37(1):25-34. |
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