THE FORMATION OF HOLOCENE MARSH FORAMINIFERAL ASSEMBLAGES, MIDDLE ATLANTIC COAST, U.S.A.: IMPLICATIONS FOR HOLOCENE SEA-LEVEL CHANGE
THE FORMATION OF HOLOCENE MARSH FORAMINIFERAL ASSEMBLAGES, MIDDLE ATLANTIC COAST, U.S.A.: IMPLICATIONS FOR HOLOCENE SEA-LEVEL CHANGE
复制标题
美国大西洋中部海岸全新世沼泽有孔虫组合的形成：对全新世海平面变化的影响
DOI：
10.2113/0300272
复制
发表时间：
2000
影响因子：
1.1
通讯作者：
J. Pizzuto
中科院分区：
文献类型：
--
作者：
Scott P. Hippensteel;Ronald E. Martin;D. Nikitina;J. Pizzuto
由于分布不均和季节性繁殖，沉积物-水界面和岩心下的有孔虫输入在短面积距离内发生显着的时空变化；有孔虫组合反过来又受到孔隙水化学的季节性、季节间和年际变化的成岩作用的影响。季节性地表和近地表组合通常不能代表更深层的组合，而后者更有可能被纳入沉积记录中。 “人工时间平均”（ATA）组合的聚类分析揭示了约 20 厘米深度的组合的明显变化。沉积物上部 60 厘米，尤其是上部 20 厘米的有孔虫的差异性保存可能会产生明显的古环境变化，这种变化可能会被误解为过去约 100-200 年海平面的快速下降。
Substantial spatio-temporal variation in foraminiferal inputs occur over short areal distances at the sediment-water interface and downcore as a result of patchy distributions and seasonal reproduction; foraminiferal assemblages are in turn diagenetically overprinted by seasonal, inter-seasonal, and inter-annual changes in pore-water chemistry. Seasonal surface and near-surface assemblages are typically unrepresentative of deeper assemblages that are more likely to be incorporated into the sedimentary record. Cluster analysis of “artificially time-averaged” (ATA) assemblages revealed a distinct change in assemblages at ~20 cm depth. Differential preservation of foraminifera in the upper 60 cm, and especially the upper 20 cm, of sediment may produce an apparent paleoenvironmental change that could potentially be misinterpreted as a rapid fall in sea-level over the last ~100–200 years.