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长江中下游地区变质基底及地壳形成时间 被引量:14

TIME OF FORMATION FOR METAMORPHIC BASEMENT AND CRUST IN THE MIDDLE-LOWER REACHES OF YANGTZE RIVER
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摘要 本文根据长江中下游地区中生代侵入岩长石Pb同位素组成和Nd同位素模式年龄研究,提出长江中下游地区是由几个晚太古-早元古代和中元古代块体组成的变质基底;其地壳的形成具有多阶段演化的特点,大致是:晚太古代(>2500Ma)形成古陆核,早元古代(2500-1900Ma)陆壳初步形成,中元古代(1800-1200Ma)陆壳快速增长,晚元古代(1000Ma)以后区内陆壳增生基本趋于停止。 Based on Pb isotope compositions and Nd isotope model ages of feldspar for the Mesozoic intrusive rocks in the Middle-Lowet Reaches of Yangtze River, the authors suggest the metamorphic basement consist of several terrains of late Archean-early Proterozoc and middle Proterozoic. The formation of crust is characteristic of the poly-stage evolution. An evolutionary process is described. The old nuclus formed in late Archean (>2500Ma). The orisinal crust formed in early Proterozoic (2500- 1900Ma),growing rapidly in Middle Proterozoic (1800-200Ma) and ceased growing in late Proterozoic (<1000Ma).
出处 《火山地质与矿产》 1996年第3期42-50,共9页 Volcanology & Mineral Resources
基金 国家攀登项目!A30
关键词 长江中下游地区 变质基底 地壳 形成时间 Middle-Lower Reaches of Yangtze Rirer Metamorphic basement crust growing
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