本文選題：南海西北次海盆　切入點(diǎn)：層序地層　出處：《大地構(gòu)造與成礦學(xué)》2017年02期 　論文類(lèi)型：期刊論文

【摘要】：通過(guò)對(duì)南海西北次海盆新獲得的地震資料進(jìn)行綜合解釋和層序地層分析,揭示了海盆中的沉積對(duì)構(gòu)造演化階段的響應(yīng)。始新世-早漸新世陸緣裂陷期,盆地以對(duì)稱(chēng)裂谷形式,發(fā)育地塹裂谷層序,沉積以近物源為特征,相變大,發(fā)育了沖積扇-扇三角洲-湖相沉積,沉積體系的配置受同沉積斷裂控制明顯,快速沉降和充分的物源供給決定了沉積體系的構(gòu)成特征。晚漸新世海底擴(kuò)張期,巖石圈破裂,陸緣進(jìn)一步拉開(kāi)并開(kāi)始海底擴(kuò)張,出現(xiàn)海相沉積,來(lái)自陸坡的陸架邊緣三角洲越過(guò)陸坡進(jìn)入海盆,在海盆內(nèi)沉積了一套向海盆中部逐漸減薄的楔狀地層,并伴有大量的火山碎屑沉積物。早-中新世以來(lái)熱沉降期,隨著構(gòu)造沉降增大,相對(duì)海平面總體不斷上升,進(jìn)入深水盆地,形成陸架陸坡體系,大量的碎屑物質(zhì)以重力流、深水底流等深水作用方式進(jìn)入海盆;沉降晚期陸架-陸坡物源供應(yīng)減弱,瓊東南中央峽谷成為其主要的物質(zhì)供應(yīng)來(lái)源通道,在此期間二次海平面下降、回升的綜合作用下,海盆內(nèi)發(fā)育了多期以下切水道為特征的低水位域沉積體系。
[Abstract]:Based on the comprehensive interpretation and sequence stratigraphy analysis of the newly acquired seismic data in the northwest subbasin of the South China Sea, the response of the sediments in the basin to the tectonic evolution stage was revealed. The basin was in the form of symmetric rift valley during the Eocene to early Oligocene continental margin rifting. The graben rift sequence is developed, the deposition is characterized by near material source, large phase change, alluvial fan, fan delta and lacustrine facies, and the configuration of sedimentary system is obviously controlled by synsedimentary faults. Rapid subsidence and sufficient material supply determine the structural characteristics of the sedimentary system. During the late Oligocene seafloor expansion, the lithosphere ruptured, the continental margin further opened and began to spread, resulting in marine deposits. The continental shelf marginal deltas from the continental slope crossed the slope into the basin and deposited a set of gradually thinning wedge formations in the middle of the basin, accompanied by a large amount of pyroclastic sediments. With the increase of tectonic subsidence, relative sea level rises continuously, and enters deep water basin, forming continental shelf slope system. A large amount of clastic material enters the ocean basin by gravity flow, deep water flow and other deep-water processes. In the late stage of subsidence, the material supply of shelf and slope weakened, and the central valley of southeast Hainan became its main material supply channel. During this period, the secondary sea level dropped and recovered. The sedimentary system in the low water level region is characterized by multiple periods of undercut waterways in the basin.
【作者單位】： 國(guó)土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室廣州海洋地質(zhì)調(diào)查局;中國(guó)科學(xué)院深�？茖W(xué)與工程研究所;
【基金】：“南海北部陸坡及臺(tái)灣海峽盆地西部油氣地質(zhì)特征及賦存歸律研究”項(xiàng)目(基[2013]GZH002-31)資助
【分類(lèi)號(hào)】：P736.1

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