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Through visco-elastic-plastic-thermodynamic numerical simulation, this study reveals the dynamic processes following magma intrusion into the mid-crust and elucidates the synergistic control mechanism of magma properties and wall-rock rheological characteristics on migration pathways. The results show that: 1) The density difference between magma and wall rock is the key factor controlling whether magma can ascend. When the density difference is low, magma tends to spread laterally in the mid-crust; when the density difference is high, magma has sufficient buoyancy to initiate ascent. 2) Given that the density difference provides the driving force for ascent, viscosity dominates the migration style. Low-viscosity magma can rapidly intrude into tensile fractures at the top to form vertical dikes, whereas high-viscosity magma, constrained by flow resistance, ascends obliquely along shear zones at the margins of sills. 3) The presence of a mid-crustal magma chamber alters the surrounding stress field, prompting magma to ascend asymmetrically along ring faults and form double-wing transport channels. The numerical simulation results reveal the physical mechanism governing the divergence of mid-crustal magma migration pathways, clarify the potential constraints of deep migration processes on shallow volcanic eruption styles, and provide an understanding of the complexity of volcanic conduit systems and the spatial differentiation of eruptive activity.
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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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