| Compositions of heavy minerals in Northeastern China sandlands and provenance analysis |
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| 作者单位： | XIE Jing（Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Graduate University of Chinese Academy of Sciences,Beijing 100049,China） ;
DING ZhongLi（Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China） ; |
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| 基金项目： | Supported by the Innovation Research Group Project of the National Natural Science Foundation of China (Grant No.40021202) |
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| 摘 要： | Sand samples deposited since the Last Glacial Maximum (LGM) from the Hulun Buir, Horqin and Otin-dag sandlands were measured for their assemblages of heavy minerals and chemical compositions of detrital garnets and tourmalines. Heavy mineral assemblages of these three sandlands consist mainly of garnet, ilmenite, epidote and minor amphibole and magnetite. Garnets consist mainly of high Mg type-A ones (58% on average), and minor type-B ones. Toumalines are mainly composed of Mg-rich and minor Fe-rich ones. Compared with those of central-southern Mongolia and central Tarim, these three sandlands are derived from the Phanerozoic rocks of the Central Asian Orogenic Belt and the Archean and Paleoprotorozoic basement rocks of the North China Craton. Our results provide direct evidence that the present-day sands may be reworked from LGM ones. Differences of heavy mineral composi-tions occur between the samples of the three sandlands and Taklimakan Desert, indicating that the material of the western arid regions contributes little to the eastern sandlands.
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| 收稿时间： | 29 January 2007 |
| 修稿时间： | 5 June 2007 |
Compositions of heavy minerals in Northeastern China sandlands and provenance analysis |
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| Authors: | Xie Jing Ding ZhongLi |
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| Institution: | 1. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Graduate University of Chinese Academy of Sciences,Beijing 100049,China
2. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China |
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| Abstract: | Sand samples deposited since the Last Glacial Maximum (LGM) from the Hulun Buir, Horqin and Otin-dag sandlands were measured for their assemblages of heavy minerals and chemical compositions of detrital garnets and tourmalines. Heavy mineral assemblages of these three sandlands consist mainly of garnet, ilmenite, epidote and minor amphibole and magnetite. Garnets consist mainly of high Mg type-A ones (58% on average), and minor type-B ones. Toumalines are mainly composed of Mg-rich and minor Fe-rich ones. Compared with those of central-southern Mongolia and central Tarim, these three sandlands are derived from the Phanerozoic rocks of the Central Asian Orogenic Belt and the Archean and Paleoprotorozoic basement rocks of the North China Craton. Our results provide direct evidence that the present-day sands may be reworked from LGM ones. Differences of heavy mineral composi-tions occur between the samples of the three sandlands and Taklimakan Desert, indicating that the material of the western arid regions contributes little to the eastern sandlands. |
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| Keywords: | heavy minerals provenance Northeastern China garnet tourmaline |
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