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Influence of mid-crustal rheology on the deformation behavior of continental crust in the continental subduction zone
Li, FC; Sun, Z; Zhang, JY; lfc@scsio.ac.cn
2018
发表期刊JOURNAL OF GEODYNAMICS
卷号117页码:88-99
摘要Although the presence of low-viscosity middle crustal layer in the continental crust has been detected by both geophysical and geochemical studies, its influence on the deformation behavior of continental crust during subduction remains poorly investigated. To illustrate the crustal deformation associated with layered crust during continental subduction, we conducted a suite of 2-D thermo-mechanical numerical studies with visco-brittle/plastic rheology based on finite-differences and marker-in-cell techniques. In the experiments, we established a three-layer crustal model with a quartz-rich middle crustal layer embedded between the upper and lower continental crust. Results show that the middle crustal layer determines the amount of the accreted upper crust, maximum subduction depth, and exhumation path of the subducted upper crust. By varying the initial effective viscosity and thickness of the middle crustal layer, the further effects can be summarized as: (1) a rheologically weaker and/or thicker middle crustal layer results in a larger percentage of the upper crust detaching from the underlying slab and accreting at the trench zone, thereby leading to more serious crustal deformation. The rest of the upper crust only subducts into the depths of high pressure (HP) conditions, causing the absence of ultra-high pressure (UHP) metamorphic rocks; (2) a rheologically stronger and/or thinner middle crustal layer favors the stable subduction of the continental crust, dragging the upper crust to a maximum depth of similar to 100 km and forming UHP rocks; (3) the middle crustal layer flows in a ductile way and acts as an exhumation channel for the HP-UHP rocks in both situations. In addition, the higher convergence velocity decreases the amount of subducted upper crust. A detailed comparison of our modeling results with the Himalayan collisional belt are conducted. Our work suggests that the presence of low-viscosity middle crustal layer may be another possible mechanism for absence of UHP rocks in the southern Tibet.
部门归属[Li, Fucheng; Sun, Zhen; Zhang, Jiangyang] South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Li, Fucheng] Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China
学科领域Geochemistry & Geophysics
关键词[WOS]Mid-crustal layer ; Crustal deformation ; Continental subduction ; Tibet
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17133
专题中科院边缘海地质重点实验室
通讯作者lfc@scsio.ac.cn
推荐引用方式
GB/T 7714
Li, FC,Sun, Z,Zhang, JY,et al. Influence of mid-crustal rheology on the deformation behavior of continental crust in the continental subduction zone[J]. JOURNAL OF GEODYNAMICS,2018,117:88-99.
APA Li, FC,Sun, Z,Zhang, JY,&lfc@scsio.ac.cn.(2018).Influence of mid-crustal rheology on the deformation behavior of continental crust in the continental subduction zone.JOURNAL OF GEODYNAMICS,117,88-99.
MLA Li, FC,et al."Influence of mid-crustal rheology on the deformation behavior of continental crust in the continental subduction zone".JOURNAL OF GEODYNAMICS 117(2018):88-99.
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