岩石矿物学杂志2011，Vol.30Issue(5)：873-882,10.
西伯利亚克拉通东南缘1.84Ga构造热事件——俄罗斯斯塔诺夫南带南缘混合岩化黑云斜长片麻岩锆石U-Pb年龄和Hf同位素记录
Recognition of the 1.84 Ga tectono-thermal event in the southeastern margin ofthe Siberian craton: record from zircon U-Pb dates and Hf isotopes of migmatitic biotite plagioclase gneiss from the southern edge of southern Stanov belt, Tydna,Far East, Russia
摘要
Abstract
These data indicate that the metamorphic rocks were formed in Paleoproterozoic instead of Archaean as conventionally thought. Hafnium analysis shows that the cores of zircons from migmatitic felsic gneiss have negative or positive as well as variable εHf(t) values ( - 16.2 to + 2.7) and Archean (3.7 to2.8 Ga) depleted-mantle model ages, the overgrowths of zircon have negative variable εHf (t) values ( - 18.6 to -7.5) and Archean (3.6 to 2.9 Ga) depleted-mantle model ages. The eHf(t) values of most zircon cores are negative, indicative of a recycled continental crust. The source region of these magmas might have been related to Archean material of the Aldan Craton, suggesting derivation from an isotopically heterogeneous old crust source. U-Pb in situ zircon dating shows a 1. 84 Ga overgrowth of zircons in migmatitic gneiss, implying Paleoproterozoic migmatization. The 1.84 Ga age of the migmatization event is correlated with the 1.9'-1.8 Ga high grade metamorphism recorded in other regions of the world such as North America craton, Greenland, Baltica, and North China Craton, and was probably related to the formation of the Columbia.关键词
锫石U-Pb年龄/Hf同位素/混合岩化黑云斜长片麻岩/斯塔诺夫/西伯利亚克拉通/俄罗斯Key words
zircon U-Pb ages/ Hf isotope/ migmatitic biotite plagioclase gneiss/ Stanov/ Siberian craton/ Russia分类
天文与地球科学引用本文复制引用
王彦斌,童英,王涛,Andrey Sorokin,韩娟,侯可军..西伯利亚克拉通东南缘1.84Ga构造热事件——俄罗斯斯塔诺夫南带南缘混合岩化黑云斜长片麻岩锆石U-Pb年龄和Hf同位素记录[J].岩石矿物学杂志,2011,30(5):873-882,10.基金项目
国家自然科学重点基金资助项目(90714006) （90714006）
中国地质调查局项目(1212011121066) （1212011121066）
