Preliminary assessment of 188bet zokb characteristics of late Miocene - Quaternary intrusive and extrusive magmatism in 188bet zokb Tu Chinh - Vung May basin, Southeastern continental shelf of Vietnam
Summary
Based on 188bet zokb seismic and well dataset provided by 188bet zokb Vietnam Petroleum Institute (VPI), 188bet zokb authors have mapped and described 188bet zokb characteristics of 188bet zokb distribution and morphology of magmatic bodies as well as relatively dated them in 188bet zokb Tu Chinh - Vung May basin and adjacent areas. To distinguish magmatic bodies from other amplitude anomalies such as gas zone or carbonate build-up/layers, multiple criteria were used such as cross-cutting relationship, associated deformation of surrounding strata, morphology and geological relationship between different magmatic bodies. Intrusive bodies are usually sheet-like or saucer-shaped sills that cross-cut strata and even deform overlying strata, while extrusive bodies are usually cone-shaped vents/volcanoes or extensive lava sheets that conform to strata. 188bet zokb magmatic bodies often distribute in clusters around one or more magmatic conduits. Middle Miocene and older syn-rift faults controlled 188bet zokb pathway of 188bet zokb conduits. Magmatic bodies are more abundant closer to 188bet zokb East Sea spreading margin. Late Miocene - Quaternary magmatism is widespread in 188bet zokb study area in particular, and in 188bet zokb East Sea and adjacent areas in general. These activities took place after rifting and oceanic crust formation had ended, which is characteristic of magma-poor margins.
Key words: Intrusive, extrusive, Tu Chinh - Vung May basin, Late Miocene - Quaternary, Vietnam continental shelf.
