According to the detailed study of the historical earthquake records and causative structure of the Minxian M6 1/2 earthquake in 1573 A.D., we have found that the most grievous disaster area lies nearby the Minxian co...According to the detailed study of the historical earthquake records and causative structure of the Minxian M6 1/2 earthquake in 1573 A.D., we have found that the most grievous disaster area lies nearby the Minxian county seat （Minzhou county at that time ）. So, we have identified the extremely seismic area of the 1573 A.D. The Minxian M6 1/2 earthquake was located in Minxian city, the intensity of the meizoseismal region is Ⅷ - Ⅳ, the epicenter is 34.4°N, 104.0°E, the location precision is Ⅱ and the deviation of location is less than or equal to 25km. Tectonically, this area lies in the transition region of stress transfer and structural transform between the east Kunlun fault and the northern margin of the west Qiuling fault. The differential activity of the Lintan-Dangchang fault zone is obvious, and only parts of the segment put up Holocene activity. There are landslides and rock bursts of different sizes in the meizoseismal region. By integrated analysis, we conclude that the Minxian-Dangchang segment of the Lintan-Dangchang fault is the seismogenic structure of the 1573 A.D. M6 1/2 Minxian earthquake, in Gansu Province.展开更多
The survey of fluorite ore resources in Shangkuli area is based on years of data collection and research in the survey area and mineral inspection to select some favorable ore-forming sections. It summarizes the metal...The survey of fluorite ore resources in Shangkuli area is based on years of data collection and research in the survey area and mineral inspection to select some favorable ore-forming sections. It summarizes the metallogenic geological background, strata, magmatic rocks, structures and other metallogenic geological conditions in the survey area. It synthesizes the geological, geophysical, geochemical and remote sensing anomalies and the temporal and spatial distribution laws of minerals in the survey area, systematically summarizes the mineralization laws of the ore-controlling factors of fluorite ore in the survey area, conducts the prediction research on typical deposits and regional minerals, divides the prospecting areas and selects 2 prospecting target areas. Through anomaly verification and ore spot inspection, one new mineral spot, six ore spots and eight mineralized spots have been discovered, and a number of geochemical anomalies of 1: 50,000 have been circled, and the resources have been predicted and estimated respectively.展开更多
基金This research was sponsored bythe sub-project entitled "Active Tectonic Framework and Assessment of Tendency of Seismic Riskinthe Key Earthquake Risk Regionsin Gansu,Sichuan and Qinghai Provinces"under the"Special project of emergent intensive observation of earthquake situation onthe north-south earthquake zone"of China Earthquake Administration and the Joint Earthquake Science Foundation of CEA under grant number 604018.Contribution number :LC20060042 of Lanzhou Institute of Seismology,CEA.
文摘According to the detailed study of the historical earthquake records and causative structure of the Minxian M6 1/2 earthquake in 1573 A.D., we have found that the most grievous disaster area lies nearby the Minxian county seat （Minzhou county at that time ）. So, we have identified the extremely seismic area of the 1573 A.D. The Minxian M6 1/2 earthquake was located in Minxian city, the intensity of the meizoseismal region is Ⅷ - Ⅳ, the epicenter is 34.4°N, 104.0°E, the location precision is Ⅱ and the deviation of location is less than or equal to 25km. Tectonically, this area lies in the transition region of stress transfer and structural transform between the east Kunlun fault and the northern margin of the west Qiuling fault. The differential activity of the Lintan-Dangchang fault zone is obvious, and only parts of the segment put up Holocene activity. There are landslides and rock bursts of different sizes in the meizoseismal region. By integrated analysis, we conclude that the Minxian-Dangchang segment of the Lintan-Dangchang fault is the seismogenic structure of the 1573 A.D. M6 1/2 Minxian earthquake, in Gansu Province.
文摘The survey of fluorite ore resources in Shangkuli area is based on years of data collection and research in the survey area and mineral inspection to select some favorable ore-forming sections. It summarizes the metallogenic geological background, strata, magmatic rocks, structures and other metallogenic geological conditions in the survey area. It synthesizes the geological, geophysical, geochemical and remote sensing anomalies and the temporal and spatial distribution laws of minerals in the survey area, systematically summarizes the mineralization laws of the ore-controlling factors of fluorite ore in the survey area, conducts the prediction research on typical deposits and regional minerals, divides the prospecting areas and selects 2 prospecting target areas. Through anomaly verification and ore spot inspection, one new mineral spot, six ore spots and eight mineralized spots have been discovered, and a number of geochemical anomalies of 1: 50,000 have been circled, and the resources have been predicted and estimated respectively.
