Late Weichselian deglaciation and sea level history of St Jonsfjorden, Spitsbergen: A contribution to ice sheet reconstruction
Late Weichselian deglaciation and sea level history of St Jonsfjorden, Spitsbergen: A contribution to ice sheet reconstruction
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斯匹次卑尔根岛圣琼斯峡湾晚魏希瑟尔冰消期和海平面历史：对冰盖重建的贡献
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发表时间：
2005
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通讯作者：
B. Rea
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作者：
D. Evans;B. Rea
摘要斯匹次卑尔根岛西部圣约恩峡湾测得的海岸线的海拔和年龄提供了韦克塞尔晚期冰消的年表和前冰厚度的代表。支持西北斯匹次卑尔根岛的两套海岸线，最古老的（在60米的圣约恩峡湾）可追溯到前晚期Weichselian冰川和最年轻的记录冰后期反弹以前的报告。古老海岸线的显著幸存表明，斯匹次卑尔根岛西北部的大部分地区要么被保护性的冷基冰覆盖，要么在韦克塞尔晚期仅受到局部冰川作用的影响，即使冰川冰延伸到伊斯峡湾海槽的陆架边缘。在圣Jonsfjorden口的46米的海洋限制是兼容的区域晚Weichselian海洋限制（LWML）的日期为1.13万年BP。一个部分相对海平面曲线和等距海岸线图制作的圣Jonsfjorden和使用结合相对海平面曲线的基础上，从以前的研究数据，以产生一个等基图9万年BP。曲线表明，西部网站受到最初的缓慢出现，然后迅速出现之间的10万年和8.2万年BP，趋势特征的地区受一个完整的冰海或至少受到早期打破了薄或不连续的冰川冰盖。在分隔伊斯峡湾和货车米延峡湾的半岛西端，9 ka BP海岸线长剖面中的一个台阶表明，全新世新构造运动可能在该地区产生了非常高的回弹率。
Abstract The elevation and age of surveyed shorelines in St Jonsfjorden, western Spitsbergen, provide a chronology for Late Weichselian deglaciation and a proxy for former ice thickness. Support is provided for previous reports of two sets of shorelines on NW Spitsbergen, the oldest (at 60 m in St Jonsfjorden) dating to a pre‐late Weichselian glaciation and the youngest documenting postglacial rebound. The remarkable survival of the older shorelines suggests that a large area of NW Spitsbergen was either covered by protective, cold‐based ice or was subject to only local glaciation during the late Weichselian even though glacier ice extended to the shelf edge in the Isfjorden Trough. A marine limit of 46 m at the mouth of St Jonsfjorden is compatible with the regional late Weichselian marine limit (LWML) dated to ∼13 ka BP. A partial relative sea level curve and equidistant shoreline diagram are produced for St Jonsfjorden and used in conjunction with relative sea level curves based on data from previous studies to produce an isobase map for 9 ka BP. The curves indicate that western sites were subject to initial slow emergence followed by rapid emergence between 10 ka and 8.2 ka BP, trends characteristic of areas affected by a full glacial sea or at least subject to early break up of a thin or discontinuous glacier ice cover. A step in the 9 ka BP shoreline long profile over the western end of the peninsula separating Isfjorden and van Mijenfjorden suggests that Holocene neotectonics may have produced anomalously high rebound rates in that area.