U-Pb isotopic dating of cassiterite: Development of reference materials and in situ applications by LA-SF-ICP-MS

被引：53

作者：

Yang, Ming ^{[1
,2
,3
]}

Romer, Rolf L. ^{[4
]}

Yang, Yue-Heng ^{[1
,2
,3
]}

Wu, Shi-Tou ^{[1
,2
]}

Wang, Hao ^{[1
,2
,3
]}

Tu, Jia-Run ^{[5
]}

Zhou, Hong-Ying ^{[5
]}

Xie, Lie-Wen ^{[1
,2
]}

Huang, Chao ^{[1
,2
]}

Xu, Lei ^{[1
,2
]}

Yang, Jin-Hui ^{[1
,2
,3
]}

Wu, Fu-Yuan ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, PB 9825, Beijing 100029, Peoples R China

[2] Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China

[3] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China

[4] GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany

[5] China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China

来源：

CHEMICAL GEOLOGY | 2022年 / 593卷

基金：

中国国家自然科学基金;

关键词：

Cassiterite; U-Pb dating; Pb-208; correction; LA-SF-ICP-MS; Reference materials; FURONG TIN DEPOSIT; AGE CONSTRAINTS; IOLITE FREEWARE; HUNAN PROVINCE; MOLE GRANITE; GEOCHRONOLOGY; MINERALIZATION; MAGMATISM; EVOLUTION; CRYSTALLIZATION;

D O I：

10.1016/j.chemgeo.2022.120754

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Cassiterite, the economically most important tin mineral, typically has moderate U and variable common Pb contents, making it amenable for U-Pb dating. Cassiterite has extremely low Th/U ratios (Th/U < 0.01) and its Pb-208 is dominantly common Pb. This is particularly helpful as there is significant interference of tungsten oxides on Hg-202 and Pb-204. The feasibility of the Pb-208 correction procedure is discussed in detail. The Pb-208 corrected LA-SF-ICP-MS data are in good agreement with intercept ages in the Tera-Wasserburg diagram and Pb-207 corrected ages. Twelve cassiterite samples were investigated using the ID-TIMS and LA-SF-ICP-MS methods. The ID-TIMS results of Pit-AB, Rond-A, RG-114, BB#7 and 19GX cassiterite are reported for the first time in this study. RG-114, BB#7 and 19GX cassiterite have very low common Pb contents and are recommended for use as primary reference materials for in situ cassiterite. Pit-AB, Rond-A and Yankee cassiterite contain a small amount of common Pb, produce reliable and consistent ages and are suitable as primary reference materials. The remaining five cassiterite samples (Kard, Zinnwald, Els, XBD-W and Y724) were only investigated using the LA-SF-ICP-MS method and produce ages consistent with published age data from the host rocks associated with the tin deposits and with published U-Pb ages of cassiterite from the same deposits. We present an ID-TIMS U-Pb of 154.3 +/- 0.7 Ma for the commonly used cassiterite reference material AY-4. This age differs from previously reported ID-TIMS ages. This age discrepancy is caused by different initial common Pb compositions rather than age heterogeneity.

引用

页数：19