华北克拉通南缘太古—元古宙界线安沟群火山岩的年龄及地球化学

高山; 周炼; 凌文黎; 刘勇胜; 周鼎武

Volume 30 Issue 3

May 2005

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Article Navigation > Earth Science > 2005 > 30(3): 259-263

GAO Shan, ZHOU Lian, LING Wen-li, LIU Yong-sheng, ZHOU Ding-wu, 2005. Age and Geochemistry of Volcanic Rocks of Angou Group at the Archean-Proterozoic Boundary. Earth Science, 30(3): 259-263.

Citation:

GAO Shan, ZHOU Lian, LING Wen-li, LIU Yong-sheng, ZHOU Ding-wu, 2005. Age and Geochemistry of Volcanic Rocks of Angou Group at the Archean-Proterozoic Boundary. Earth Science, 30(3): 259-263.

GAO Shan, ZHOU Lian, LING Wen-li, LIU Yong-sheng, ZHOU Ding-wu, 2005. Age and Geochemistry of Volcanic Rocks of Angou Group at the Archean-Proterozoic Boundary. Earth Science, 30(3): 259-263.

Citation:

GAO Shan, ZHOU Lian, LING Wen-li, LIU Yong-sheng, ZHOU Ding-wu, 2005. Age and Geochemistry of Volcanic Rocks of Angou Group at the Archean-Proterozoic Boundary. Earth Science, 30(3): 259-263.

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Age and Geochemistry of Volcanic Rocks of Angou Group at the Archean-Proterozoic Boundary

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2005-01-16
Publish Date: 2005-05-25

Abstract

Abstract

The Dengfeng Group and Angou Group from the Dengfeng area, Henan Province preserve rocks at the Archean- Proterozoic boundary. Kröner et al.(1988) yielded an SHRIMP U-Pb zircon age of (2 512± 12) Ma for a date from the up- per Dengfeng Group. Here we report an Sm-Nd whole rock isochron age of (2 507± 96) Ma (MSWD= 6.3) for 7 volcanic rocks from the Angou Group with initial ¹⁴³Nd/¹⁴⁴Nd= 0.509 560± 0.000 093, which corresponds to ε_Nd(2.5 Ga)= 3.27± 1.82. This constrains an age difference of less than 113 Ma between the top of Dengfeng and the bottom of Angou volcanic rocks. The less evolved Angou metatholeiites are characterized by asthenospheric La/Nb ratios (< 2.0). Together with the bimodal character, it is inferred that the Angou Group formed in a continental rift setting.
- North China craton,
- Archean,
- bimodal volcanic rocks,
- Sm-Nd isotope

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References(21)

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