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在赣东北蛇绿混杂岩带发现含晚古生代放射虫硅质岩，测定了该带内和带外几个关键地点的火山岩和辉长岩的４０Ａｒ／３９Ａｒ同位素地质年龄，获得了以下结果：火山岩的坪年龄为４３４．９～４８６．７Ｍａ，辉长岩的坪年龄为２３２．５～２６６．３Ｍａ．因此可以肯定赣东北地区有早古生代晚期的火山活动，证实了上述火成岩不是中、新元古代的产物．它们中的一部分与晚古生代硅质岩都是蛇绿岩套的成员，属该区晚古生代洋壳的组成部分
The Late Paleozoic radiolarian chert was discovered in the ophiolitic mélange zone in the northeastern Jiangxi Province. The 40Ar / 39Ar isotopic geological ages of volcanic and gabbro in several key locations within and outside this zone were determined. The following results were obtained: volcanic rocks The Ping age is 434.9 ~ 486.7Ma, the gypsum Ping age is 232.5 ~ 266.3Ma. Therefore, we can confirm that there are early Paleozoic volcanic activities in the northeastern Jiangxi Province, confirming that the above igneous rocks are not the products of the Neoproterozoic and Neoproterozoic. Some of these are members of the ophiolite suite with late Paleozoic siliceous rocks and are part of the Late Paleozoic oceanic crust