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U-Th-Pb behavior of zircons under high-grade metamorphic conditions:A case study of zircon dating of meta-diorite near Qixia,eastern Shandong

查看全文 作　　者：Yusheng [1]Wan;Dunyi [1]Liu;Chunyan [1]Dong;Shoujie [1]Liu;Shijin [2]Wang 高影响力作者 机构地区：[1]Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;[2]Shandong Geological Survey, Jinan 250013, China高影响力机构 出　　处：《Geoscience Frontiers》索引2011年第2卷第2期,共10页高影响力期刊 基　　金：supported by the Key Program of the Ministry of Land and Resources of China(Grant Nos.1212010811033, 1212010711815) 摘　　要：This paper carried out a study on U—Th—Pb behavior of zircons in a'dry'rock system during high-grade metamorphism in the Archean basement of eastern Shandong.The studied sample has a mineral assemblage of plagioclase + K-feldspar + clinopyroxene + biotite + quartz and its protolith is considered to be diorite.The zircons are stubby,equant or irregular in shape and show fir-leaf, sectorial,banded or oscillatory zoning.They contain inclusions,including mineral assemblages of clinopyroxene + orthopyroxene + hornblende + quartz and plagioclase + K-feldspar + biotite + quartz. Fifty SHRIMP analyses were performed on 34 zircon grains,which commonly yielded high Th/U ratios (mostly>0.5).Most analyses are distributed along concordia from 2.54 to 2.25 Ga,with the youngest age being~1.95 Ga.Compositions and ages show large variations even in a same zircon grain.Combined with early studies,conclusions can be drawn as follows:1) the diorite underwent two episodes of high-grade metamorphism.at the end of the Neoarchean and the Paleoproterozoic(~2.50 Ga and~1.95 Ga or slightly later):2) high-grade metamorphism in a'dry'rock system may partially reset the U—Th—Pb system of zircons and.in this case,the ages between the oldest and youngest 关 键 词：变质条件 闪长岩 锆石 行为 Pb 案例 山东 SHRIMP
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