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| 1 | Paleoclimate and Paleoenvironment of Gonghe Basin, Qinghai-Tibet Plateau, During the Lastdeglacial: Weathering, Erosion and Vegetation Cover Affect Clay Mineral Formation显示文摘With the analysis of the sources and formation mechanism of the clay minerals in the sediment core from the Dalianhai lake in the Gonghe Basin, northeastern Tibet-Qinghai Plateau, clay mineral composition proxies, grain-size and carbonate contents have been employed for highresolution study in order to reconstruct East Asian Summer Monsoon(EASM) over the northeastern Tibet-Qinghai Plateau during the lastdeglacial. The study also extended to establish a relationship between vegetation cover changes and erosion during the last 14.5 ka with pollen record and clay mineral proxies. Smectite/kaolinite and smectite/(illite+chlorite) ratios allow us to assess hydrolysis conditions in lowlands and/or physical erosion process in highlands of the Gonghe Basin. Before 12.9 Cal ka BP, both mineralogical ratios show low values indicative of strong physical erosion in the basin with a dominant cold and dry phase. After 12.9 Cal ka BP, an increase in both mineralogical ratios indicates enhanced chemical weathering in the basin associated with a warm and humid climate. The beginning of Holocene is characterized by high smectite/(illite+chlorite) and smectite/kaolinite ratios that is synchronous as with deposition of many peat laminae, implying the best warm and humid conditions specifically between 8.0 to 5.5 Cal ka BP. The time interval after 5.0 Cal ka BP is characterized by a return to high physical erosion and low chemical weathering with dry climate conditions in the basin. Comparing variations of clay mineral assemblages with previous pollen results, we observe a rapid response in terms of chemical weathering and physical erosion intensity to a modification of the vegetation cover in the basin. | SUN Qingfeng Christophe COLIN | 2014 | Acta Geologica Sinica(English Edition)2014，88，2： | 6 |
| 2 | Last Deglaciation Climatic Fluctuation Record by the Palaeo-Daocheng Ice Cap, Southeastern Qinghai-Tibetan Plateau显示文摘The last deglaciation, a key period for understanding present and future climate changes, has long been the hot topic for palaeoclimatological study. The Qinghai-Tibetan Plateau(QTP) is often a target study area for understanding hemispheric, or even global environment changes. The glacial landforms on the QTP provide a unique perspective for its climate change. In order to investigate the onset of the last deglaciation at the QTP and its regional correlation, the terrestrial cosmogenic nuclides(TCN) 10 Be and 26 Al surface exposure dating was chosen to date the roche moutonnée, the polished surface and the moraine debris located at the palaeo-Daocheng Ice Cap(pDIC), southeastern QTP. Our results show that the onset of the last deglaciation is at about 19 ka, followed by another warming event occurring around 15 ka in the p-DIC area. These timings agree well with other records, e.g. equivalent with a rapid sea level rise at 19 ka and the onset of B?lling warming event at about 15 ka. Thus, our new data can provide good reveal constraint on the climate evolution at the QTP. | ZHANG Zhigang XU Xiaobin WANG Jian ZHAO Zhijun BAI Shibiao CHANG Zhi Yang | 2014 | Acta Geologica Sinica(English Edition)2014，88，6： | 6 |
| 3 | Cosmogenic ^(10)Be and ^(26)Al Chronology of the Last Glaciation of the Palaeo-Daocheng Ice Cap,Southeastern Qinghai-Tibetan Plateau显示文摘The glacial landforms of the Qinghai-Tibetan Plateau(QTP) provide a unique opportunity to research hemispheric and global environmental changes. In this study,we focus on the glacial history of the palaeo-Daocheng Ice Cap(p-DIC) in the southeastern QTP during the last glacial cycle. Based on field investigations,morphostratigraphy,and surface exposure dating of roche moutonnée,polished surface and moraine debris through the terrestrial cosmogenic nuclides(TCN) 10 Be and 26 Al. We identify glacial deposits of the last deglaciation,with minimum ages of 14.9±1.3–18.7±1.7 ka,the Last Glacial Maximum(LGM) of 24.7±2.2 ka,and the early part of the last glacial period(marine oxygen isotope stage(MIS) 3) of 37.1±3.4–45.2±3.9 ka. Our results show that in this region,the extent of the glacial advance during MIS 3 was larger than that during the traditional LGM(MIS 2). These ages are consistent with prior chronologies,and the 10 Be age is consistent with the 26 Al age for the same sample. Thus,these data provide reliable constraints on climate change in the QTP,during the last glaciation. | ZHANG Zhigang WANG Jian XU Xiaobin BAI Shibiao CHANG ZhiYang | 2015 | Acta Geologica Sinica(English Edition)2015，89，2： | 5 |
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