| Citation: | Liangjie Tang, Taizhu Huang, Zehong Cui, Suju Yang, Yixiu Zhu, Xianmei Jin. Geodynamic Indications on Igneous Rocks of Transitory Geologic Setting during the Late Hercynian in North Tarim Basin. Journal of Earth Science, 2008, 19(6): 577-590.
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Basic and intermediate-acidic igneous rocks were developed during the late Hercynian in North Tarim basin. The geochemistry characteristics of the rocks show that basic volcanic rock has K2O/Na2O = 0.18-0.61 < 1 and falls into a category of basalt of sodium system. The rocks contain en- riched large-ion lithophile elements (LILE) (K, Rb, Ba, Th) and high-field strength elements (HFSE) (Nb, Ta, Ti, Zr, P), with the magmatic material from the upper mantle. The intermediate-acidic volcanic rocks have σ = 1.91-2.96 < 3.3, K2O/Na2O = 1.25-1.59 > 1, as well as the enriched LILE and depleted HFSE (Nb, Ta, Ti, P), presenting the same trace element compositions and character- istics as in the granitic rocks of South Tianshan Mt.; they are either shoshonitic igneous rocks or high-K calc-alkaline igneous rocks, with a distinct crust-derived component feature. The comprehensive analyses on the characteristics of the trace elements, the graphic tectonic dis-crimination, and the distribution features of the two types of igneous rocks show that they were formed under different tectonic settings and geodynamic environments: the basalt was formed in the active rifting period when the active mantle upwelling caused the thinning of lithosphere; the intermediate- acidic volcanic-intrusive rock was formed in the island arc area of the active continental margin in North Tarim; the formation is associated with the plate subduction during the course of South Tian- shan Ocean closure-the subduction of Middle Tianshan Mountain toward the Tarim plate. The basic and intermediate-acidic igneous rocks reveal a tectonic regime of extension-extrusion transition, which is significant in determining the key tectonic revolution period of North Tarim basin.
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