Metamorphic Pressure of the Luzhenguan Group in the North Huaiyang Low-grade Metamorphic Belt and Its Indication for Evolution of the Dabie Mountains

详细信息   

• 责任者：Wang Yongsheng (School of Resource and Environmental Engineering ; Hefei University of Technology ; Hefei 230009 ; China) ; Sheng Yong
• 刊名：Geological Review
• 出版年：2012
• 卷期：58(5)
• 关键词：超高压变质带 ; ultrahigh pressure metamorphic zones ; 地质压力计 ; geologic barometry ; 板块俯冲 ; subduction ; 大别山 ; Dabie Mountains
• 页码：p.865-872
• 图表：3 illus., 1 table, 40 refs.
• 分类号：0802
• issnNo：ISSN0371-5736
• isbnNo：CN11-1952/P

摘要

The Luzhenguan Group is an important part of the North Huaiyang low-grade metamorphic belt (NH), whose evolution process is critical for offering evidences for deep-subduction of the uhra-pressure rocks and getting integrated history of the Dabie Mountains. In this work, some biotite two feldspar gneisses with garnet and garnet-biotite gneisses were collected in Niujiaochong and Yu’erjie, Huoshan County, for electronic analysis. Using the garnet-biotite-plagioclase-quartz geobarometry, metamorphic pressure between 1.89 ~1.99 GPa and the average 1.94 GPa was gained. Based on average density of the rocks located in upper and middle crust of the Dabie Mountains, a conclusion is drawn that the Luzhenguan Group once subducted into 64.7 km in depth. This conclusion suggests that the North Huaiyang belt experienced deeper subduction and supports that the suture zone between the North China block and the South China locates in north of the North Huaiyang belt.