Preservation and Grain-Size Trends of Holocene Wave-Dominated Facies Successions in Eastern Japan: Implications for High-Resolution Sequence Stratigraphic Analysis
Preservation and Grain-Size Trends of Holocene Wave-Dominated Facies Successions in Eastern Japan: Implications for High-Resolution Sequence Stratigraphic Analysis
复制标题
日本东部全新世波浪主导相序列的保存和粒度趋势：对高分辨率层序地层分析的启示
DOI：
10.1306/021304740718
复制
发表时间：
2004
影响因子：
2
通讯作者：
T. Tamura
中科院分区：
文献类型：
--
作者：
T. Tamura
垂向粒度趋势为硅质碎屑波控相层序的层序地层分析提供了重要信息。本文利用高分辨率AMS 14C测年、沉积相和粒度，讨论了两个截然不同的沿海平原——九十九里和仙台全新世波控层序的保存时间与粒度趋势之间的关系。众数粒度被提议作为评估沉积深度定性变化的一个良好标准。九十九里和仙台层序均为向上变细 - 向上变粗的波控层序，发育在侵蚀面之上。九十九里层序向上变细的部分形成于高位期的海退沉积中，而仙台的则形成于海侵期间。向上变细产生时间的差异是由于海侵滨面沉积在侵蚀面上的保存潜力不同。在仙台地区，这种潜力比九十九里地区高得多，因为在海侵期间仙台侵蚀面从邻近河流获得了更多的沉积物供应。由于时间尺度较短，两个地区之间不同的构造抬升速率对保存潜力并不关键。这些层序在底部显示出双峰粒度分布，在其他地方则为单峰分布。双峰性被认为是粗粒海侵滞留物与来自外部源的较细沉积物混合的结果。较细的模态与上覆沉积中的单峰粒度形成一致的趋势。在九十九里，该趋势是简单的向上变粗，在仙台则是向上变细再变粗，这与沉积深度的变化显示出明显的相关性。因此，众数粒度（而非均值或中值）的垂向趋势最适合评估古代波控相层序中沉积深度的变化。
Vertical grain-size trends provide significant information for the sequence stratigraphic analysis of siliciclastic wave-dominated facies successions. This paper discusses the relationships between the preservation timing and the grain-size trends of Holocene wave-dom- inated successions in two contrasting coastal plains: the Kujukuri and Sendai, using high-resolution AMS 14 C dating, depositional facies, and grain size. Modal grain size is proposed as a good criterion for eval- uating qualitative changes of depositional depth. The Kujukuri and Sendai successions are both fining-upward to coarsening-upward wave-dominated successions that have developed upon ravinement surfaces. The fining-upward part of the Kujukuri succession formed in regressive deposits during a highstand period, whereas that of the Sendai formed during transgression. A difference in the timing of the generation of upward fining is due to the varying preservation potential of transgressive shoreface deposits on the ravi- nement surface. In the Sendai area, the potential was much higher than in the Kujukuri area, because the Sendai ravinement surface had re- ceived greater sediment supply from the adjacent rivers during trans- gression. A differing rate of tectonic uplift between the areas was not critical to the preservation potential because of the short time scale. The successions show bimodal grain-size distributions in the basal parts and unimodal distributions elsewhere. The bimodality is consid- ered to be the result of mixing of a coarse transgressive lag with finer sediment derived from external sources. The finer mode forms a con- sistent trend with unimodal grain sizes in overlying deposits. The trend is of a simple upward coarsening in the Kujukuri and an upward fining to coarsening in the Sendai, showing distinctive correlation with chang- es of depositional depth. Thus, the vertical trend of the modal grain size (and not mean or median) is best for evaluating changes of de- positional depth in ancient wave-dominated facies successions.
YOKO OTA 等人：“根据美国华盛顿州纳塞尔河口的埋藏森林和埋藏泥炭估算的古地震活动”第四纪研究。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--
日本北部太平洋海岸仙台海岸棱柱体的内陆架到岸面沉积序列：与全新世相对海平面变化相关的空间和时间生长模式
DOI：
--
发表时间：
2004
期刊：
Journal Asian Earth Sciences 23
影响因子：
--
作者：
Tamura;T.;F.Masuda
通讯作者：
F.Masuda