An analysis of trace elements and isotopic geochemistry suggest that the ore‐forming materials of gold deposits in the Jiaodong granite‐greenstone belt have multiple sources, especially the mantle source. Seismic wave, magnetic and gravity fields show that the crust‐mantle structure and its coupling mechanism are the fundamental dynamic causes for the exchange and accumulation of materials and energy in the metallogenic system. Considering the evolution history of the structural setting, the tectono‐metallogenic dynamics model of the area can be summarized as follows: (1) occurrence of the greenstone belt during the Archean‐Proterozoic—the embryonic form of Au‐source system; (2) stable tectonic setting in the Paleozoic—an intermittence in gold mineralization; (3) intensive activation and reformation of the greenstone belt in the Mesozoic—tectono‐mineralization and tectono‐diagensis; (4) posthumous structural activity in the Cenozoic—destruction of orebodies in the later stage. In the middle and late Indosinian, the Tancheng‐Lujiang fault zone cut deeply into the upper mantle so that the ore‐bearing fluids migrated to higher layers through the crust‐mantle interaction, resulting in alteration and mineralization.
Almost all intraplate caprocks experienced strong deformation during the convergence of microplates, and then disintegrated into many secondary geologic units with the special characters, such as irregular boundaries and particular structural assemblages. In order to understand the formation mechanism of these special phenomena, a rheological experiment on the structural scenery of the Tongling area is carried out. The result shows that the primary regular and uniform boundaries of the Tongling area becomes irregular because of the enclosing and confinement of surrounding geological units in the process of “compression‐shearing‐rotation‐drag”; simultaneously, two specific “drag depressions” developed at two opposite corners of the block. The former and the later phenomena can be regarded as a typical regional‐scale rheological effect and necessary outcome of intraplate deformation respectively.
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