摘要
在黑龙江省东部牡丹江市以东八面通杂岩（原黑龙江群）的黑云花岗片麻岩中发现了早期旋回的碎屑岩浆锆石，采用锆石单颗粒双带源逐层蒸发－沉积法，测得该锆石的结晶时代为２８７１±８Ｍａ，属中太古代晚期。这是迄今发现的该区最古老地质记录。由此推测，文献中所说的佳木斯地块南部可能曾经发育中太古代结晶基底，黑龙江省东部地壳形成过程中曾经遭受了中太古代晚期构造热事件。
The late Middle Archean geological record ,residual zircon of 2871Ma, has been discoveredfrom the Bamiantong complex(primary Heilongjiang group) exposed on the Mudanjiang area(129°59′58″E, 44°41′40″N), eastern Heilongjiang province, NE China. It implies that the late MiddleArchean tectonothermal event took place in the early stage of the crustal formation and evolution,and that there probably existed the mature continental crust during the late Archean in the area.
关键词
中太古代
碎屑岩浆
地质意义
锆石
residual zircon late Middle Archean eastern Heilongjiang province
