Computer Science
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.3904c&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 15, p. 3904-3914.
Computer Science
14
Scientific paper
Silicate Nd Sr isotopes of the fine-grained fractions of the 10 major deserts and sandy lands in North China and the loess in Chinese Loess Plateau were systematically investigated. Wide ranges in Nd Sr isotopic compositions have been observed. The results of the <75 μm silicate fractions show that the Nd Sr isotopic compositions of each desert are quite homogeneous and unique. According to the geographic distribution of the deserts and their Nd Sr isotopes of both the <75 and <5 μm silicate fractions, three isotopic regions of Chinese deserts can be identified: (A) the deserts on the northern boundary of China, with the highest ɛNd(0) > -7.0; (B) the deserts on the northern margin of Tibetan Plateau, with ɛNd(0) ranging from -11.9 to -7.4; and (C) the deserts on the Ordos Plateau, with the lowest ɛNd(0) < -11.5. The distribution of the threes isotopic regions is controlled by the tectonic setting in North China, which implies that the materials of the deserts are derived from the locally eroded rocks from the surrounding mountains and the Nd Sr isotopic signatures of these deserts could be quit stable over the past million years on the sub-tectonic time scales if there is any desert at those times. The Nd Sr isotopic compositions of the loess are mostly close to those of the deserts in isotopic region B, suggesting that the main source regions of the last glacial loess in the Chinese Loess Plateau are Badain Jaran Desert, Tengger Desert, and Qaidam Desert. Also, the comparison between the Nd Sr isotopes of the <5 μm silicate fractions of the deserts and the ancient dust falls in the North Pacific and Greenland show that the Asian end members of these dust falls are derived most from the deserts in the isotopic region B and less from those in the isotopic region C.
Balsam William
Chen Jun
Ji Junfeng
Li Gaojun
Lu Huayu
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