Winograd I J, Coplen T B, Szabo B J, Riggs A C
Science. 1988 Dec 2;242(4883):1275-80. doi: 10.1126/science.242.4883.1275.
A continuous record of oxygen-18 (delta(18)O) variations in the continental hydrosphere during the middle-to-late Pleistocene has been obtained from a uranium-series dated calcitic vein in the southern Great Basin. The vein was deposited from ground water that moved through Devils Hole-an open fault zone at Ash Meadows, Nevada-between 50 and 310 ka (thousand years ago). The configuration of the delta(18)O versus time curve closely resembles the marine and Antarctic ice core (Vostok) delta(18)O curves; however, the U-Th dates indicate that the last interglacial stage (marine oxygen isotope stage 5) began before 147 +/- 3 ka, at least 17,000 years earlier than indicated by the marine delta(18)O record and 7,000 years earlier than indicated by the less well dated Antarctic delta(18)O record. This discrepancy and other differences in the timing of key climatic events suggest that the indirectly dated marine delta(18)O chronology may need revision and that orbital forcing may not be the principal cause of the Pleistocene ice ages.
通过对大盆地南部一条铀系测年的方解石脉进行研究，获得了更新世中晚期大陆水圈中氧-18（δ¹⁸O）变化的连续记录。该矿脉由地下水沉积而成，这些地下水在50至310千年前流经内华达州阿什梅多斯的一个开放断层带——魔鬼洞。δ¹⁸O随时间变化的曲线形态与海洋和南极冰芯（沃斯托克）的δ¹⁸O曲线极为相似；然而，铀-钍测年结果表明，最后一个间冰期阶段（海洋氧同位素阶段5）始于147±3千年前，比海洋δ¹⁸O记录所显示的时间至少早17000年，比年代测定不太准确的南极δ¹⁸O记录所显示的时间早7000年。这种差异以及关键气候事件时间上的其他不同之处表明，间接测年的海洋δ¹⁸O年表可能需要修正，而且轨道强迫作用可能不是更新世冰期的主要成因。
