拼合的准噶尔盆地基底:基底火山岩Sr-Nd同位素证据

NATURE AND EVOLUTION OF AMALGAMATED BASEMENT OF JUNGGAR BASIN, NORTHWESTERN CHINA: Sr-Nd ISOTOPE EVIDENCES OF BASEMENT IGNEOUS ROCK

在详细岩相学、主元素和微量元素研究基础上 ,报道了准噶尔盆地基底不同区块火山岩的Sr-Nd同位素和锆石颗粒年龄研究成果 ,结合盆地周缘造山带古生代构造史、古生物、沉积建造、火山岩、侵入岩的综合研究成果 ,表明准噶尔盆地基底可能由分属哈萨克斯坦板块、塔里木板块 (?)和西伯利亚板块刚性体外围的岛弧体系经构造软碰撞拼合而成 ,它们又经历了块体拼合后的构造 -岩浆热事件 (如基性岩浆底侵作用 )的进一步改造和影响 .

The basement of Junggar basin in the shape of triangle, interspersed in the Tarim plate, Siberia plate and Kazakhstan plate, is the key to initiating the dispute on the Xinjiang geological evolution. The igneous rocks of basement act as the role of “igneous probe”. On the basis of the research into the detailed lithofacies, major elements and trace elements, the age dating research results of Sr_Nd isotope and zircon grain of the igneous rocks in different regions, together with the comprehensive results in Palaeozoic tectonic history, palaeontology, sedimentary formation, igneous rocks, intrusive rocks in the orogenic zone around the basin, indicate that the Junggar basement may have been a product of the soft collision and matching in tectonics between island arc systems located in the periphery of rigid bodies of the Kazakhstan plate, Tarim plates (?) and Siberia plate that occurred in different stages of the Paleozoic and subsequently experienced Mesozoic modification by tectonic_magmatic thermal events (such as the basic magmatic basal erosion).