Hercynian

Geohistory simulation indicates: since Cambrian, Bachu area had experienced the transforming from depression to uplift. Present tectonic uplift began in Hercynian and formed in the Himalayan.

地史模拟结果表明：自寒武纪以来，巴楚地区大致经历了由坳陷至隆起和由稳定的斜坡到活动的前缘隆起的转变，现今构造隆起形态发端于海西期，定型于喜山期。

And ( 2) correspond to a geosynclinal regime with geosynclinal folding and closing ( Hercynian), while ( 3) corresponds to a diwa regime ( epi-Hercynian).

在区域大地构造的关系上：①、②对应于地槽褶皱、封闭的地槽体制（海西期），③对应于地洼体制（后海西期）。

Its contents are similar to those of EM ⅰ OIB from the Gough islands, and show ocean island alkaline basalt characteristics including the discriminant diagrams of tectonic settings for volcanics, which implies that the Hercynian volcanics were formed in tectonic environment of ocean island.

以其不相容元素比值，相当于Gough岛EMⅠOIB型洋岛玄武岩，其构造环境判别图进一步印证了海西期火山岩形成于洋岛碱性玄武岩环境。