• 责任者：Zhang Hanzhi (Laboratory of Earth Surface Process and Environment ; School of Geographic and Oceanographic Sciences ; Nanjing University ; Nanjing 210093 ; China) ; Lu Huayu
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(2)
• 关键词：沙地 ; sandy land ; 锆石 ; zircon ; 沙漠 ; deserts ; 中国 ; China
• 页码：p.334-344
• 图表：illus., 1 table, 70 refs.
• 分类号：1400
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

Deserts,sand fields,and Gobi deserts in Northern China are proposed as one of the most persistent sources of world wide wind-blown mineral dust, and also source of the aolian deposit in Chinese Loess Plateau. However, specific pathways and detailed area of dust have not been established yet. This paper contributes to this problem by investigating source areas of six major deserts and sand fields （Taklimakan desert, Badain Jaran desert, Tengger desert, Mu Us sand field, Otindag sand field, Horqin sand field）in Northern China.spacerun: yes">  Here, zircon typology is introduced as a tool to trace the original orogenic belts or cratons for aeolian sediment since their shape is associated with the rock petrogenetic types. Long columnar zircons often come from magmatic rock, short columnar and columnar with well developed pyramids come from alkaline granites. Acidic granite zircons are always columnar, while sandstones produce flat columnar zircons. Thus, six types of zircon shape mentioned above are introduced to distinguish different rocks; five colors of the zircons are recognized（ colorless,light pink, pink,light purpl and purple）to identify relative ages of the rocks. Inclusion in zircon is also introduced to analyze rock metamorphism.spacerun: yes">  Four orogenic belts and cratons are discussed in this study, the Tarim Craton, the Central Asian Orogenic System（CAOS） ,the Central Orogenic Belt（COB） and the North China Craton（NCC）. The Tarim Craton is widely distributed by Neoarchaean gneisses （TTG type granites and minor supracrustal rocks ）, and Proterozoic metamorphic rocks. The CAOS mainly consists of Early-Middle Triassic metaluminous-weakly peraluminous, calc-alkaline-high-K calc-alkaline or weak alkaline rocks and Late Triassic-Early Jurassic metaluminous-wealy peraluminum,high-K calc-alkaline or alkaline granites. The NCC is mainly covered by Early to Late Archean basement rocks. On the north of the NCC, the Yanshan Fold and Thrust Belt （YFTB） , is characterized by Late Triassic to Late Jurassic sandstones. While the COB has remarkable number of metamorphic rocks.spacerun: yes">  Thirty six dune samples are selected for zircon typology analysis. The result suggests that detrital zircon typology among one desert is relative homogenous. The detrital zircons in Taklimakan desert are mainly columnars with well developed pyramids or short columnars indicating an alkaline granites origin. The CAOS to the north is most likely to be the source of these detrital zircons. Most detrital zircons in Tengger desert contain inclusion, revealing a source of metamorphic rock. This feature implies COB is an important source for sediments in Tengger desert. Zircons of B~dain Jaran desert share characters of the two deserts above, suggesting a mixing origin of these two orogenic belts. As for the Mu Us sand field and Otindag sand field, zircons with alkaline-series-granite origin make a large proportion,as well as the dark ones. These features indicate a mixing origin of the CAOS and NCC. The Horqin sand field has large amount of seriously eroded flat columnar zircons, suggesting a sandstone origin. Sandstones widely distributed in the YFTB are probably source of these sediments. This study concludes that detrital zircon shape in a desert or sand field is characterized by the sediment source,and the deposit is transported by river or near-surface wind to these deserts or sand fields.