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| Lithology, kinematics and geochronology related to Late Mesozoic basin-mountain evolution in the Nanxiong-Zhuguang area, South China | |
| 作者姓名： | SHU Liangshu DENG Ping WANG Bin TAN Zhengzhong YU Xinqi & SUN Yan . |
| 作者单位： | SHU Liangshu1，DENG Ping1，2，WANG Bin1，TAN Zhengzhong2，YU Xinqi1 & SUN Yan1 1. Department of Earth Sciences，Nanjing University，Nanjing 210093，China; 2. Research Institute No.290，CNNC，Shaoguan 512026，China |
| 基金项目： | 国家自然科学基金，国家重点项目 |
| 摘 要： | The Nanling Mountain is an important Mesozoic orogenic belt in the south of China, its E-W-trending granites and adjacent sedimentary basins form a dis-tinctive basin-mountain landform. The Nanxiong basin and the Zhuguang granite, both located in the northern Nanling belt, make up a typical basin-mountain sys-tem. Since the 1970s, a systematical research on gran-ites and their deposit ores was carried out, from that the two main viewpoints were proposed1—5], including (1) the polyphase gr… |
Lithology,kinematics and geochronology related to Late Mesozoic basin-mountain evolution in the Nanxiong-Zhuguang area,South China |
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| SHU Liangshu,DENG Ping,,WANG Bin,TAN Zhengzhong,YU Xinqi & SUN Yan ..Lithology, kinematics and geochronology related to Late Mesozoic basin-mountain evolution in the Nanxiong-Zhuguang area, South China[J].Science in China(Earth Sciences),2004,47(8):673-688. | |
| Authors: | Liangshu Shu Ping Deng Bin Wang Zhengzhong Tan Xinqi Yu Yan Sun |
| Institution: | 1. Department of Earth Sciences,Nanjing University,Nanjing 210093,China 2. Department of Earth Sciences,Nanjing University,Nanjing 210093,China;Research Institute No.290,CNNC,Shaoguan 512026,China 3. Research Institute No.290,CNNC,Shaoguan 512026,China |
| Abstract: | The Nanxiong red-bed basin and its adjacent Zhuguang granite form a distinctive basin-mountain landform in the Nanling region, South China. Research results suggest that the Zhuguang granite is a polyphase composite pluton developed on the metamorphic basement of the paleo-Tethys-paleo-Asian tectonic regime and possesses geometrical and kinematic features of hot-doming extensional tectonics at the middle-upper crustal level, which is considered as a magmatic complex that resulted from the collision-orogeny during the Indosinian Period, the subduction-consuming during the Early Yanshanian Period and the intra-continental basaltic underplating and deep-seated geodynamics during the Late Yanshanian Period. The Nanxiong basin is a Late Cretaceous-Paleogene asymmetric faulted basin that is characterized by a fault boundary on the northern side and an uncomformable boundary on the southern side, its deposit center was migrated gradually from south to north. Structural kinematic results on the basin-mountain coupled zone demonstrate that the ductile and the brittle rheological layers show a quite coincident sense of shear, implying that it is a continuous process from the ductile extensional deformation followed by locally sinistral strike-slip shear at a middle-crustal level to the brittle tensional deformation at a upper-crustal level during formation of granitic doming extensional tectonics. The Zhuguang granite and the Nanxiong faulted basin constructed a semi-graben tectonic system. Lithological and geochemical results suggest that the Late Triassic to Jurassic granitic bodies in the Zhuguang have some similar features: high SiO2, Al2O3, K2O contents, alkalinity index ＞ 2.8, ANKC value ＞ 1.1, LREE-enriched pattern with high REE contents, marked negative Eu anomalies, enrichment in Rb and Th, depletion in Ba and Nb, showing a K-rich and Al-rich calc-alkaline affinity, which suggest a continuous magmatic evolution from Late Triassic to Jurassic. Formation of Nanxiong basin and evolution of basin-mountain system were controlled both by the Zhuguang granitic-doming and the regional extensional tectonics.Development of the olivine basalt in the basin suggests that tension action was very strong during lava eruption. The magma-type zircon grains of basalt from the Nanxiong basin yielded the SHRIMP age of 96±1Ma, providing reliable geochronological constraint on the tectono-thermal event and basin-mountain evolution in the Nanling region, South China. |
| Keywords: | lithology structural kinematics basin-mountain evolution SHRIMP age Zhuguang granite Nanxiong basin |
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