Early Cretaceous uplift history of the Dabie orogenic belt: Evidence from pluton emplacement depths

The North Dabie complex unit (NDC) is a widely exposed petro-tectonic unit. To understand post-orogenic uplift history and mechanism of the Dabie orogenic belt, many samples of granite, granodiorite, diorite, and alkali feldspar granite with precise zircon U-Pb ages were collected for electron micro...

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Published inScience China. Earth sciences Vol. 57; no. 5; pp. 1129 - 1140
Main Authors Wang, YongSheng, Wang, HaiFeng, Sheng, Yong, Xiang, BiWei
Format Journal Article
LanguageEnglish
Published Heidelberg Science China Press 01.05.2014
Springer Nature B.V
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Summary:The North Dabie complex unit (NDC) is a widely exposed petro-tectonic unit. To understand post-orogenic uplift history and mechanism of the Dabie orogenic belt, many samples of granite, granodiorite, diorite, and alkali feldspar granite with precise zircon U-Pb ages were collected for electron microprobe analysis of hornblende. Emplacement pressure values were then cal- culated by using an Al-in-hornblende geobarometer. The result shows that total A1 (A1T) values in hornblende range from 1.17 to 1.97 p.f.u., XFe(=Fe/(Fe+Mg)) from 0.4 to 0.65, and corresponding pressure values from 256.8 to 676.2 MPa for A1T greater than 1.17. It is suggested that although the main mechanism for the uplift is tectonic extension, inhomogeneous uplift related to the pluton emplacement is also important during post-orogenic evolution of the Dabie orogenic belt. Emplacement depth dis- tribution of the plutons shows that uplift in the NDC is affected by horst-graben structures since 120 Ma.
Bibliography:11-5843/P
Dabie orogenic belt, North Dabie complex belt, Early Cretaceous plutons, Al-in-hornblende geobarometer
The North Dabie complex unit (NDC) is a widely exposed petro-tectonic unit. To understand post-orogenic uplift history and mechanism of the Dabie orogenic belt, many samples of granite, granodiorite, diorite, and alkali feldspar granite with precise zircon U-Pb ages were collected for electron microprobe analysis of hornblende. Emplacement pressure values were then cal- culated by using an Al-in-hornblende geobarometer. The result shows that total A1 (A1T) values in hornblende range from 1.17 to 1.97 p.f.u., XFe(=Fe/(Fe+Mg)) from 0.4 to 0.65, and corresponding pressure values from 256.8 to 676.2 MPa for A1T greater than 1.17. It is suggested that although the main mechanism for the uplift is tectonic extension, inhomogeneous uplift related to the pluton emplacement is also important during post-orogenic evolution of the Dabie orogenic belt. Emplacement depth dis- tribution of the plutons shows that uplift in the NDC is affected by horst-graben structures since 120 Ma.
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ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-013-4659-5