A New 14C Data Set of the PY608W-PC Sediment Core from Lake Pumoyum Co (Southeastern Tibetan Plateau) Over the Last 19 kyr
A New 14C Data Set of the PY608W-PC Sediment Core from Lake Pumoyum Co (Southeastern Tibetan Plateau) Over the Last 19 kyr
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DOI：
10.1017/s0033822200046518
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发表时间：
2010
期刊：
影响因子：
8.3
通讯作者：
Takahiro Watanabe;Tetsuya Matsunaka;Toshio Nakamura;M. Nishimura;Yasuhiro Izutsu;M. Minami;F. Nara;T. Kakegawa;Liping Zhu
中科院分区：
文献类型：
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作者：
Takahiro Watanabe;Tetsuya Matsunaka;Toshio Nakamura;M. Nishimura;Yasuhiro Izutsu;M. Minami;F. Nara;T. Kakegawa;Liping Zhu
2006年8月，在普木阴湖东部采集了一个新的连续沉积物岩心（PY608W-PC， 3.8 m长），用于青藏高原东南部气候环境变化的重建。PY608W-PC下部沉积物层（深度380-300 cm）主要由相对较大的植物残体（长度可达~ 3 cm）组成，并含有细砂和砂质粉砂的混合物。PY608W-PC岩心的大型植物残留物在~ 300-290 cm深度处消失，取而代之的是粉砂质粘土。PY608W-PC下部的大量植物残留物可能是水生的，因为植物残留物的13C含量非常丰富（平均高达-3.0‰，- 5.6±2.3‰）。另一方面，岩心上部（深度290 ~ 0 cm）植物残体（PRC馏分）可能为陆生C3植物（δ13C平均值为-21.8±1.7‰）。对PY608W-PC沉积物岩心中的大型植物残体和PRC组分进行了放射性碳定年，它们代表了从~ 19,000 cal BP到现在的年代。
A new continuous sediment core (PY608W-PC; 3.8 m length) for reconstruction of climatic and environmental changes in the southeastern Tibetan Plateau was taken from the eastern part of Lake Pumoyum Co in August 2006. Sediment layers of the lower part of PY608W-PC (380–300 cm depth) were composed mainly of relatively large plant residues (up to ∼3 cm in length) with an admixture of fine sand and sandy silt. The large plant residues disappeared at ∼300–290 cm depth in core PY608W-PC and were replaced by silt-silty clay. The large plant residues from the lower part of PY608W-PC could be aquatic, because the plant residues were extremely enriched in 13C (up to –3.0‰, −5.6 ± 2.3‰ on average). On the other hand, the plant residue concentrates (PRC fractions) from the upper part of the core (290–0 cm in depth) could be terrestrial C3 plants (δ13C = –21.8 ± 1.7‰ on average). Radiocarbon dating was performed on the large plant residues and PRC fractions from the PY608W-PC sediment core, which represented the chronology from ∼19,000 cal BP to present.