北淮阳新开岭地区花岗岩锆石U-Pb年龄和氧同位素组成

吴元保; 郑永飞; 龚冰; 赵子福

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 659-672

WU Yuan-bao, ZHENG Yong-fei, GONG Bing, ZHAO Zi-fu, 2005. Zircon U-Pb Ages and Oxygen Isotope Compositions for Granite at Xinkailing in the Beihuaiyang Zone and Their Significance. Earth Science, 30(6): 659-672.

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Zircon U-Pb Ages and Oxygen Isotope Compositions for Granite at Xinkailing in the Beihuaiyang Zone and Their Significance

CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2005-07-21
Publish Date: 2005-11-25

Abstract

Abstract

SHRIMP zircon U-Pb dating and oxygen isotope analysis were carried out for granites at Xinkailing in the Beihuaiyang zone. In cathodoluminescence (CL) images, most zircons in one granite sample exhibit primary oscillatory zoning, which is typical for magmatic zircon, but some grains have internal structure altered by hydrothermal fluid; whereas the oscillatory zonations of most zircons in the other granite have been significantly disturbed, reflecting much stronger modification by hydrothermal alteration. The zircon U-Pb dating for the oscillatory zoned and hydrothermally altered domains yields two groups of weighted mean ²⁰⁶Pb/²³⁸U ages at (820±4) Ma and (780±4) Ma, respectively, which are interpreted as timing of granite emplacement and hydrothermal alteration. According to the obtained ages, the formation and later supersolidus hydrothermal alteration of the Xinkailing granite correspond to the two stages of bimodal magmatism with ages of ca. 830 to 795 Ma and ca. 780 to 745 Ma, respectively, for pre-rift and syn-rift during the breakup of the supercontinent Rodinia. They have very low δ¹⁸O values, with 1.90‰ to 5.78‰ for zircon, -2.88‰ to -7.67‰ for quartz, and -4.01‰ to -11.40‰ for plagioclase. Zircon and other minerals display obvious O isotope disequilibrium, while the other minerals approached O isotope re-equilibration at different temperatures during the hydrothermal alteration. Zircons with a more strongly altered internal structure have lower relative δ¹⁸O values. Therefore, the high-T hydrothermal alteration at Xinkailing may have occurred under supersolidus conditions, which not only completely reset the O isotope composition of quartz, but also partly modified the O isotope composition of zircon. The low δ¹⁸O values of zircon in some samples may be partly acquired from the low δ¹⁸O hydrothermal fluid. The anomalously low δ¹⁸O values of -2.88‰ to -7.67‰ for quartz indicate that the hydrothermal fluid may be derived from the meteoric water of a cold paleoclimate. Therefore, the formation of low δ¹⁸O granite during the mid-Neoproterozoic at Xinkailing is correlated with rifting magmatism and the snowball earth event.
- Xinkailing,
- zircon,
- O isotope,
- U-Pb age,
- hydrothermal alteration,
- rift tectonics

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Zircon U-Pb Ages and Oxygen Isotope Compositions for Granite at Xinkailing in the Beihuaiyang Zone and Their Significance

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