Full
DENG Jialiang, senior engineer, majors in structural geology, E-mail：460862353@qq.com
Outline
In this paper, the geometry, kinematics and chronology of Shenjia-Guanzhuang ductile shear zone on the eastern margin of Dabie orogenic belt are studied in detail by means of field investigation, laboratory study and zircon U-Pb dating, and the geological significance of shear activity duration is discussed. The results showed that: The Shenjia-Guanzhuang ductile shear zone changes from NNW-SSE to SWW-NEE from west to east, and its tendency rotates counterclockwise from NEE to NNW, and its inclination gradually increases from about 40° to about 55°. Its kinematic characteristics change from forward sliding overlying shear to right lateral translacing shear. The overall performance is a "bow" shape with SW protrating, and the upper plate moves towards NEE. The start-up time is not earlier than 129.3±2.5 Ma, and the end is before 124.7±1.7 Ma. The end of ductile shear activity marks the end of intracontinental orogenic evolution of Dabie orogenic belt, and the beginning of post-orogenic uneven block uplift stage. The tectonic regime transformation of Dabie mountains and even eastern China has been completed, and the Dabie mountains have entered the coastal Pacific tectonic domain, which may be closely related to the major adjustment of the movement mode of the Izanagi plate in the western Pacific.
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| 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 |
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