文章基本信息

标题：Late Archean basement in the Bangenhuken Complex of the Nordbreen Nappe, western Ny-Friesland, Svalbard
本地全文：下载
作者：Fredrik J. Hellman ; David G. Gee ; Patrik Witt-Nilsson 等
期刊名称：Polar Research
印刷版ISSN：1751-8369
出版年度：2001
卷号：20
期号：1
页码：49-59
DOI：10.3402/polar.v20i1.6499
语种：English
出版社：Co-Action Publishing
摘要：The rocks of western Ny-Friesland, northern Svalbard, are part of a tectonostratigraphy including four thrust sheets, each composed mainly of orthogneisses overlain by younger metasedimentary rocks. Previous geochronological studies have shown that the orthogneisses are dominated by ca. 1750 Mya granitoids. This study of a quartz-monzonite in one of the thrust sheets, the Nordbreen Nappe, yields a single-zircon U-Pb ion-microprobe age of 2709 Ø 28 My. This is the oldest rock unit so far reported in the Svalbard Caledonides. However, age-determinations on detrital zircons in the metasediments of western Ny-Friesland have shown that Late Archean rocks were prominent sources. The new ages presented here provide the first evidence of a local source for these sedimentary rocks.