地质科技情报2017，Vol.36Issue(3)：286-292,7.DOI:10.19509/j.cnki.dzkq.2017.0339
谷—丘互相对称的地震反射特征与成因及对琼东南盆地北礁凹陷的意义
Genesis and Characteristics of the Mutually Symmetric Trough-Mound/Hummock Seismic Reflections and Their Geological Significance in Beijiao Sag,Qiongdongnan Basin
摘要
Abstract
The mutually symmetric trough-mound/hummock seismic reflections have not attracted the attention of the geologists for a long time.With the widespread employment of seismic exploration technology,an increasing number of these reflections are found to be originated from various genesis.The paper summarizes five types of genesis for these seismic reflections:the conversation opal-A to opal-CT,the mudstone density inversion,the erosion and deposition controlled by bottom current,the differential compaction for the sand-prone fill channel in deepwater mud depositional environment and invasive magmatite sill.Comparing the five types of genesis for these seismic reflections,we implemented these seismic reflections characteristics to explain the mutually symmetric trough-mound/hummock seismic reflections in Beijiao Sag and inferred that the genesis of this seismic reflection attributes to the erosion and deposition controlled by bottom current.Mid-Miocene strata were cut or incised by bottom current in the early Late Miocene and carved into trough and mound morphology.The early Late Miocene strata were deposited into troughs and mounds which were located over or on mounds and troughs in mid-Miocene strata respectively.In the Late Miocene,the trough of the new series with turbidite has obvious migration and incision,which is fundamentally different with other four types.It is suggested the genesis of trough and mound controlled by bottom current should occur in other sags,South China Sea.关键词
丘—谷互相对称/蛋白石-A/蛋白石-CT/底流侵蚀/差异压实/岩浆岩岩床/北礁凹陷Key words
mutually symmetric trough-mound/hummock/opal-A/opal-CT/bottom current/differential compaction/magmatite sill/Beijiao Sag分类
地质学引用本文复制引用
李俞锋,蒲仁海,牛宁,李斌..谷—丘互相对称的地震反射特征与成因及对琼东南盆地北礁凹陷的意义[J].地质科技情报,2017,36(3):286-292,7.基金项目
国家科技重大专项(2011ZX05025-006-02) （2011ZX05025-006-02）
国家自然科学基金项目(41390451) （41390451）
