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Geoscience ›› 2024, Vol. 38 ›› Issue (04): 853-864.DOI: 10.19657/j.geoscience.1000-8527.2024.082

• Theories and Methods of Tectono-physicochemistry • Previous Articles     Next Articles

Multi-order Characteristics of the “Tectonic Uplift-Detachment Depression” in Blocks of the Neocathaysian Tectonic System: A Study of the Greater Khinganling Orogenic Belt

LÜ Guxian1(), ZHANG Baolin2, JIAO Jiangang3, WANG Cuizhi4, BI Minfeng5, FU Xu6, LÜ Chengxun7, MA Licheng1   

  1. 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    3. School of Earth Science and Resources, Chang’an University, Xi’an, Shaanxi 710064, China
    4. Zijin School of Geology and Mining, Fuzhou University, Fuzhou, Fujian 350108, China
    5. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    6. Inner Mongolia Geological Prospecting Co., Ltd., Hohhot,Inner Mongolia 010010, China
    7. Development Research Center of China Geological Survey Bureau, Beijing 100037, China
  • Online:2024-08-10 Published:2024-10-16

Abstract:

Block morphology can be divided into two categories: tectonic belt and tectonic block.The “tectonic belt” refers to an extension belt within a block characterized by strong rock deformation and complex geological processes, and often manifests itself as an uplift orogenic belt.The regions with weak rock deformation, primarily characterized by sedimentary processes and similar length and width, are termed tectonic blocks.Most of them are depression basins controlled by detachment structures.In the tectonic system, the block feature of “uplift and detachment” holds universal significance.This paper reveals the hierarchical characteristics of block distribution.Tectonic blocks at a certain level may be considered tectonic belts on a larger scale or at a higher level.Conversely, on a smaller scale or at a lower level, they may be represented as a combination of lower-level tectonic belts and tectonic blocks.Taking the Greater Khinganling orogenic belt as an example, this paper describes a five-order “uplift and disassembly depression” tectonic features of blocks.The first order of the Neocathaysian tectonic system is the Eastern Asian tectonic assemblage, characterized by an anticlockwise compressional shear dynamic relationship between the oceanic and continental plates.In the Neocathaysian tectonic system of Eastern China, the NNE-trending giant uplift tectonic belt and the giant detachment sedimentary basin belt represent the second order.The Greater Khinganling orogenic belt is the third-order structure, with alternating uplifted tectonic belts and subsidence depression belts.The southern section of the Greater Khinganling Mountains, known as the “magmatic core complex uplift-detachment basin depression belt” in the Chifeng area, belongs to the fourth order of the Neocathaysian tectonic system.At the fifth order, the “Mesozoic granite-complex core uplift belt-volcanic depression belt” in the Chaihulanzi gold field is crucial for orefield prospecting.The characteristics of the five-order “tectonic uplift-detachment depression belts” within the Neocathaysian tectonic system can guide the determination of metallogenic regionalization units, as well as the study of metallogenic patterns and prospecting work.In particular, the distribution of blocks within the orefield, part of the fifth order tectonic system, has fundamental and guiding significance for achieving breakthrough in ore prospecting within the key mining belt.

Key words: Neocathaysian tectonic system, distribution of tectonic uplift-detachment depression, block hierarchy

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