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| 1 | 基于U-Pb定年和单颗粒锆石粒径分析示踪中国黄土高原黄土和红粘土物源显示文摘中国黄土高原的风成沉积蕴含着丰富的大陆古气候和大气环流变化信息,但关于黄土和红粘土物源是否有变化目前仍存在着争论。近些年,锆石的LA-ICP—MS定年被广泛用于追踪沉积物来源,本文把碎屑锆石的u—Pb定年运用到红粘土中,并结合前人的数据和碎屑锆石粒径分析对黄土和红粘土物源进行了重新的讨论,认为黄土高原黄土碎屑锆石主要来源于黄土高原北部戈壁沙漠和附近的沙漠,极少量锆石来源于青藏高原北部,而不是主要来源于青藏高原北部和柴达木盆地,红粘土的锆石物源受近缘的基岩影响较大,朝那6.2—3.6Ma红粘土锆石碎屑部分来源于附近的六盘山。而且在0.12Ma、0.86Ma、1.25Ma之间,黄土碎屑锆石物源较稳定,存在少量变化,在2.6Ma和3.6Ma前后,黄土、红粘土碎屑锆石物源存在明显变化,这可能和全球变冷导致近地面冬季风增强有关。 | 李云 宋友桂 聂军胜 孙博亚 | 2014 | 地质论评2014，60，2： | 11 |
| 2 | Paleomagnetic and Fission-Track Dating of a Late Cenozoic Red Earth Section in the Liupan Shan and Associated Tectonic Implications显示文摘The north-trending Liupan Shan (六盘山) is an important tectonic boundary between the Tibetan Plateau and the Ordos platform. The Late Cenozoic red earth deposits of the Liupan Shan record its tectonic history and environmental effects. In this article we report a new Late Cenozoic red earth section from an intermontane basin in the southern part of the Liupan Shan. Lithofacies analysis, paleomagnetic and fission-track chronologies, and paleocurrent analysis have been employed to identify the tectonic uplift events of the Liupan Shan. Based on the age constraints of mammal fossils, the pa-leomagnetic polarity zones of the Huating (华亭) Section can be approximately correlated with the standard polarity zones that lie between C3An.2n and C5n.1n of the Geomagnetic Polarity Timescale; the bottom age of this section is approximately 10 Ma. Based on this and the previous studies, we infer that a tectonic event commenced in the southern Liupan Shan in this interval between 8.3 and 8.7 Ma, accompanied by a remarkable increase in sediment accumulation rate. Field observations, fission-track dating, determinations of grain-size frequency distributions and the vertebrate fossils found there suggest that the red earth deposits were reworked by water and mainly transported by fluvial-alluvial processes from the adjacent area. | 李云 宋友桂 千琳勃 李小明 强小科 安芷生 | 2013 | Journal of Earth Science2013，24，4： | 4 |
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