MARGIN: 0cm 0cm 0pt" class=MsoNormal>The petrogenesis and tectonic setting of the Indosinian granites within South China Block (SCB) are controversial, and there is no sound geochronological proof on occurrence of Indosinian magmatism in the northwestern mas-microsoft-com:office:smarttags" />Jiangxi Province. The geochronological results show that Mengshan granites consist of three Indosinian magmatisms, with ages of (236±3) Ma, (220±3) Ma and (217±1) Ma, respectively. Researches on geochemistry and Hf isotope of zircons are carried out. The regularity of genetic types and the temporal-spatial distribution of the Indosinian magmatism in SCB are summarized. On this basis, the Indosinian tectonic setting and the petrogenesis of the Indosinian granites in SCB are discussed. The northwestward subduction of Pacific was probably responsible to the Indosinian magmatisms in SCB.
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