期刊
JOURNAL OF METAMORPHIC GEOLOGY
卷 38, 期 5, 页码 471-493出版社
WILEY
DOI: 10.1111/jmg.12529
关键词
Ellesmerian Orogeny; high Arctic; monazite; Pinkie unit; QuiG barometry; Svalbard
类别
Quartz-in-garnet inclusion barometry integrated with trace element thermometry and calculated phase relations is applied to mylonitized schists of the Pinkie unit cropping out on the island of Prins Karls Forland, western part of the Svalbard Archipelago. This approach combines conventional and novel techniques and allows deciphering of the pressure-temperature (P-T) evolution of mylonitic rocks, for which theP-Tconditions could not have been easily deciphered using traditional methods. The results obtained suggest that rocks of the Pinkie unit were metamorphosed under amphibolite facies conditions at 8-10 kbar and 560-630 degrees C and mylonitized at ~500 to 550 degrees C and 9-11 kbar. TheP-Tresults are coupled with in-situ Th-U-total Pb monazite dating, which records amphibolite facies metamorphism atc.359-355 Ma. This is the very first evidence of late Devonian-early Carboniferous metamorphism in Svalbard and it implies that the Ellesmerian Orogeny on Svalbard was associated with metamorphism up to amphibolite facies conditions. Thus, it can be concluded that the Ellesmerian collision between the Franklinian margin of Laurentia and Pearya and Svalbard caused not only commonly accepted brittle deformation and weak greenschist facies metamorphism, but also a burial and deformation of rock complexes at much greater depths at elevated temperatures.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据