现代地质Issue(6):1170-1182,13.
澜沧江河流沉积物碎屑锆石 U-Pb 年龄、Hf 同位素组成及其地质意义
U-Pb Dating and Hf Isotopic Composition of Detrital Zircons in the Sediments from the Lancang River and Its Geological Significance
摘要
Abstract
In order to study the source of sediments from Lancang River and the crustal growth history of adja-cent block,Lancang River’s detrital zircons were measured for U-Pb ages and Hf isotopic composition by LA-MC-ICP-MS.The detrital zircon U-Pb ages show 5 populations including <177 Ma,201 -418 Ma,428 -544 Ma,581 -1,189 Ma and 1,406 -2,533 Ma.The peak ages are 260 Ma,788 Ma,1,827 Ma and 2,474 Ma.The detrital zircon U-Pb age distribution of sediments from the Lancang River is consistent with those of the North Qiangtang Block,which indicates dominant contribution of material from the North Qiangtang Block to the Lancang River.The detrital zircon U-Pb ages and Hf isotopic composition of the Lancang River’s sediments may reflect the formation and evolution history of the North Qiangtang Block.The period from Neoarchean to Meso-proterozoic is the continuous stage of crustal growth from the depleted mantle in the North Qiangtang Block, which accounts for more than 78% of the whole crust;until 0.64 Ga,the crustal growth of North Qiangtang block have mainly completed.关键词
澜沧江/碎屑锆石/U-Pb/Hf 同位素/北羌塘地块/地壳形成与演化Key words
Lancang River/detrital zircon/U-Pb/Hf isotope/North Qiangtang Block/formation and evolu-tion of crust分类
天文与地球科学引用本文复制引用
陈雪,陈岳龙,包创,李光琪,闫家盼,李大鹏..澜沧江河流沉积物碎屑锆石 U-Pb 年龄、Hf 同位素组成及其地质意义[J].现代地质,2014,(6):1170-1182,13.基金项目
国土资源部公益性行业科研专项(201011027-1B)。 ()