Study Of The Characteristic Of Volcanic Cycles And Stages In Carboniferous Of Malang Sag,Santanghu Basin

Triple division was applied in Malang sag, Santanghu basin volcanic rocks researches:volcanic cycle, stage and rock facies in this paper. The volcanic eruption cycles correspond tothe conception of volcanic edifices, the volcanic stages correspond to the processing of thevolcanic edifice formation and evolution, and the rock facies correspond to the type oferuption of the volcanic edifice. Comprehensive microscope thin section, core observationinformation to identify volcanic, identifying the volcanic lava and pyroclastic rocks into twocategories,38kinds of lithologyï¼› Combination of logging, seismic data,main rock faciesincluded explosive facies (pyroclastic flow subfacies,hot base surge facies, airfall subfacies),overflow facies (upper facies, middle facies, lower sub-facies), volcano-sedimentary facies(handling facies, including foreign debris subfacies), volcanic conduit facies, extrusive faciesand so on five phase, nine subfacies. Applying the technology of seismic horizontal slicesidentify seven large-scale volcanic edificies in work area, and the division of thecorresponding type and eruption patterns, and establishing three volcanic eruption modessuitable for this work area. They include explosive faciesâ†'overflow facies/extrusive facies;overflow faciesâ†'volcano-sedimentary facies; overflow faciesâ†'explosive faciesâ†'(extrusivefacies)â†'volcano-sedimentary facies. Finally Kalagang Formation is divided into fourvolcanic eruption cycles, and seven volcanic eruption stages, Haerjiawuzu Formation isdivided into four volcanic eruption cycles,and six volcanic eruption stages.