Morphological and Sedimentological Signatures of Late Holocene Prodelta Lobes in Lingayen Gulf, Philippines
Morphological and Sedimentological Signatures of Late Holocene Prodelta Lobes in Lingayen Gulf, Philippines
复制标题
菲律宾林加延湾晚全新世前三角洲叶的形态和沉积特征
DOI：
10.2112/jcoastres-d-14-00023.1
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发表时间：
2016
影响因子：
--
通讯作者：
F. Siringan
中科院分区：
文献类型：
--
作者：
Z. Mateo;F. Siringan
摘要Mateo，Z.R.P.和Siringan，F.P.，2016。菲律宾林加延湾晚全新世前三角洲叶的形态和沉积学特征。三角洲转换是海岸演化的一个组成部分，可能是自生因素和异源因素共同作用的结果。我们展示了现代和古代前三角洲沉积的近海签名，这些签名记录了菲律宾西北部林加延湾湾头地区的三角洲转换。前积体系的前三角洲浅滩在95年内以6m左右的浅水区为标志，粘土含量约为30%，而废弃三角洲则表现为加深约3m的区域，含砂率高达80%。泥质组分的分选和峰度进一步划分了现代和现代沉积环境和过程，如侵蚀和滨面环境以及以沉积物羽流和正常近海沉积为主的地区。高分辨率的海底剖面揭示了与最近四次构造诱导的三角洲转换事件有关的不同前三角洲波瓣的堆积和截断性质。记录在案的半封闭盆地中保存完好的三角洲单元序列说明了热带沿海沉积环境对自生和异生因素的敏感性，如构造作用、海平面和季风气候变化。
ABSTRACT Mateo, Z.R.P. and Siringan, F.P., 2016. Morphological and sedimentological signatures of Late Holocene prodelta lobes in Lingayen Gulf, Philippines. Delta switching is an integral part of coastal evolution and may be caused by a combination of autogenic and allogenic factors. We present offshore signatures of modern and ancient prodelta deposits that document delta switching in the bayhead region of Lingayen Gulf, NW Philippines. Prodelta lobes of prograding systems are marked by areas of shoaling of about 6 m within 95 years, with around 30% clay, whereas abandoned deltas are manifested as areas of deepening of around 3 m with as much as 80% sand. The sorting and kurtosis of the mud fraction further categorize recent and current sedimentary environments and processes such as erosional and shoreface environments and areas dominated by sediment plume and normal offshore deposition. High-resolution subbottom profiles reveal the stacked and truncated nature of different prodelta lobes associated with the latest four tectonically induced delta-switching events. This documented succession of well-preserved deltaic units in a semienclosed basin illustrates the sensitivity of tropical coastal sedimentary environments to autogenic and allogenic factors such as tectonism, sea-level, and monsoonal climate changes.