中国地质2013，Vol.40Issue(1)：43-60,18.
新疆古块体的形成与演化
The formation and evolution of ancient blocks in Xinjiang
摘要
Abstract
Four Precambrian block, i.e., Kuruk Tag-Tarim, Central Tianshan, Yili and Kepin, were recognized in Xinjiang on the southern margin of Central Asian orogenic belt. Studies show that (1) the Central Tianshan block has a close affinity with Tarim-Kuruk Tag block , as evidenced by similar pre -Nanhua basement, similar rock assemblages and tectono -magmatic evolutionary processes, implying that Kuruk Tag might be connected with Central Tianshan, and that the Kuruk Tag and Central Tianshan blocks were parts of the Tarim craton during Proterozoic period; (2) the Central Tianshan is a sub-block which was split from the northern Tarim craton during Neoproterozoic Nanhua period, and the Paleozoic Southern Tianshan oceanic basin was developed between the two blocks; (3) the Yili block was similar to the Tarim craton before Neoproterozoic Nanhua period in such aspects as rock assemblages, stratigraphic sequences, tectonic settings and evolution, showing some affinities for Tarim craton. After Nanhua period, geological differences between two blocks became obvious, and in Paleozoic, the Yili block might be linked with the Balkhash block, and in Silurian, two blocks amalgmated; (4) the Kepin block is an oceanic crustal terrane completely different from Kuruk Tag, Central Tianshan and Yili blocks in terms of rock assemblages, stratigraphic sequences, ages and evolutional history. Evidence from geological, magmatic and geochronological features and distribution of detrital zircon U-Pb ages show that Precambrian blocks (Kuruk Tag-Tarim, Central Tianshan, Yili and Kepin) of the northern Xinjiang region recorded abundant information of crustal deformation and magmatism during the early evolution of the Earth, suggesting a strong response to the global polyphase tectonic and magmatic events, including growth of the global continental core, assembly of the global Columbia, and assembly and breakup of the global Rodinia supercontinent. In contrast to the Kuruk Tag-Tarim, Central Tianshan and Yili blocks, the Kepin block preserved some records of the assembly event of Gondwana.关键词
古块体/构造-岩浆作用/聚合与离散/超大陆/中亚造山带/中国新疆Key words
ancient blocks /tectono-magmatism/ assembly and breakup/ supercontinent/ Central Asian orogenic belt/ northern Xinjiang region分类
天文与地球科学引用本文复制引用
舒良树,朱文斌,王博,吴昌志,马东升,马绪宣,丁海峰..新疆古块体的形成与演化[J].中国地质,2013,40(1):43-60,18.基金项目
国家重点基础研究发展规划项目(2007CB411301)、全国优秀博士论文(FANEDD 201130)、教育部博士点基金(20120091110024)、中国学者委员会项目(201206190049)和南京大学内生金属矿床成矿机制研究国家重点实验室研究项目(2008-I-01)资助. （2007CB411301）
