The Nature and the response characteristics of the Roo Rise to subduction zone in the eastern Indian Ocean

The Sunda arc convergent plate subduction tectonic system in Southeast Asia is one of the most active convergent plate boundary zones in the world. Early studies suggest that the Sunda arc subduction system is mainly characterized by subducted accretionary plate margin and typical accretionary prism forearc uplift landform. The latest research found that the Roo Rise, the most eastern section of the Christmas Island Seamount Province in the Wharton Basin of the eastern Indian Ocean, has reached the Java Trench region with plate movement. Compared with the “normal” oceanic crust subduction process in other regions of the Sunda arc, the Roo Rise “Uplift” structure triggered different subduction geological processes in the Sunda arc system. Combined with previous research results, the nature of Roo Rise are comprehensively summarized and understood, including the lithology and chronological origin, and the deep subduction structure characteristics of the “Rise-Trench” area. To further enhance the understanding of the early forearc subduction erosion process, including local accretionary prism front edge collision “concave”, differential uplift of forearc uplift, the compression and narrowing of the forearc basin. We discuss the response characteristics of the backarc basin to the new subduction tectonic framework of “Rise-Trench-Arc-Basin” by using two-dimensional multichannel seismic data interpretation for the first time. At present, a new stage of compressional tectonic movement is taking place in the backarc Kendeng-Madura strait basin. We believe that the characteristics of the shallow compressional anticline are the direct tectonic deformation response in the backarc basin under the new “vertical orthogonal fast and high angle” subduction structure framework formed by the Roo Rise.