摘要
综合利用南海北部陆坡珠江口盆地白云深水区水深数据、海底多波束地形资料及高分辨率多道地震资料,对该区海底重力滑脱构造的内部结构、外部形态及地震反射特征进行识别,并探讨了其主要控制因素。研究发现,白云深水区海底重力滑脱构造发育,在陆架边缘、陆坡和深海平原均有分布,海底重力滑脱构造与珠江海底峡谷共同塑造了该区的海底地形地貌特征,多期发育造成的复杂结构使其外部形态和内部地震反射呈现多样性。结合该区构造沉积背景及天然气水合物勘探研究现状,可以发现该区构造格局和上新世末珠江口海平面升降是控制其发育的必要条件,天然气水合物的多期次分解可能与其相互作用,后期底流的影响进一步改造了局部微观地貌。
Based on the water depth data,multi-beam topography data and high-resolution multi-channel seismic data,this paper identified the internal structure,external morphological characteristics and seismic reflection feature of the seafloor gravity décollement structure of Baiyun deep-water zone,Pearl river mouth basin in the northern slope of the South China sea,and analyzed the main controlling factors.The study indicated that seafloor gravity decollement structures are highly developed in Baiyun deep-water zone and distributed in the edge of continental shelf,continental slope and abyssal plain.The seafloor gravity decollement structure and Zhujiang submarine canyon together shaped the seafloor topography and geomorphology characteristics.The complex structure caused the diversity of external morphological characteristics and the internal seismic reflection characteristics.Combined the structural and sedimentary background,as well as the natural gas hydrate research status,it can be found that the seafloor gravity decollement structure is controlled by the tectonic pattern and sea level change of Pearl river estuary at the late of pliocene.Then,the natural gas hydrate decomposition and underflow further modified the local micro topography.
出处
《物探化探计算技术》
CAS
CSCD
2016年第2期219-224,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家科技重大专项(2011ZX05030-001)
国家自然科学基金(41306057)
关键词
深水区
海底重力滑脱构造
地震地质综合识别
重力搬运
deep-water zone
sea floor gravity decollement structure
seismic and geologic comprehensive identification
gravity flow
