Abstract: The authors recently worked on the geological research project about East-Southern Asia, read a lot of geological publications of Sulawesi during the latest 10 years and discovered about 25 midacidic rock samples that may be considered as normal adakites or adakite-like rock according to rock-chemical analysis data. These adakites and adakite-like rock samples are distributed in southern, central, northwestern and northern Sulawesi respectively to form a Cenozoic adakite belt at the Sundaland margin. The rock types of adakites in Sulawesi belonging to the tholeiitic, calc-alkaline and high potassium calc-alkaline series, are characterized by low values of Y and Yb of heavy REE elements and high contents of Sr. There are positive Th ，Sr anomaly value peaks and negative Nb，Ta anomaly value valley on the spider grams of the trace elements. And there are enrichments in high-field strength elements (HFSE) and large-ion thophytes elements (LITE). The adakites and adakite-like rocks of Sulawesi can be divided into two types: the first belonging to tholeiitic/calc-alkaline series may be considered to be oceanic island arc and/or continental margin volcano arc with characteristics of REE pattern of oceanic island arcs(O type). The other type belonging to high potassium calc-alkaline series may be related to continental adakites(C type) is located at continental within-plat related to main continent-continent collision or post-collision of Sulawesi.

Key words: Sulawesi(Indonesia), adakites, adakite-like, oceanic island arc, continent-continent collision or post-collision