青藏高原冈底斯带中部朱诺地区林子宗群火山岩锆石U-Pb年龄和地球化学特征

梁银平; 朱杰; 次邛; 何卫红; 张克信

doi:10.3799/dqkx.2010.021

Volume 35 Issue 2

Mar. 2010

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Article Navigation > Earth Science > 2010 > 35(2): 211-223

LIANG Yin-ping, ZHU Jie, CI Qiong, HE Wei-hong, ZHANG Ke-xin, 2010. Zircon U-Pb Ages and Geochemistry of Volcanic Rock from Linzizong Group in Zhunuo Area in Middle Gangdise Belt, Tibet Plateau. Earth Science, 35(2): 211-223. doi: 10.3799/dqkx.2010.021

Citation:

LIANG Yin-ping, ZHU Jie, CI Qiong, HE Wei-hong, ZHANG Ke-xin, 2010. Zircon U-Pb Ages and Geochemistry of Volcanic Rock from Linzizong Group in Zhunuo Area in Middle Gangdise Belt, Tibet Plateau. Earth Science, 35(2): 211-223. doi: 10.3799/dqkx.2010.021

Citation:

LIANG Yin-ping, ZHU Jie, CI Qiong, HE Wei-hong, ZHANG Ke-xin, 2010. Zircon U-Pb Ages and Geochemistry of Volcanic Rock from Linzizong Group in Zhunuo Area in Middle Gangdise Belt, Tibet Plateau. Earth Science, 35(2): 211-223. doi: 10.3799/dqkx.2010.021

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Zircon U-Pb Ages and Geochemistry of Volcanic Rock from Linzizong Group in Zhunuo Area in Middle Gangdise Belt, Tibet Plateau

doi: 10.3799/dqkx.2010.021

LIANG Yin-ping^{1, 2},
ZHU Jie³,
CI Qiong⁴,
HE Wei-hong^{1, 2},
ZHANG Ke-xin^{1, 2
,
,}

1.
Key Laboratory of Geobiology and Environmental Geology, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
4.
No.2 Geological Party, Tibet Bureau of Geology and Exploration and Exploitation of Mineral Resources, Lhasa 850000, China

Received Date: 2009-04-26
Publish Date: 2010-03-01

Abstract

Abstract

The Paleogene volcanic rock in Linzizong Group is developed in the Gangdise belt, southern Tibet plateau and it is deemed to represent the result of Neo-Tethys from its subduction to the India-Asia collision. Its precise age is significant to constrain the time of the India-Asia collision. Herein a systematic study, including zircon U-Pb ages, major and trace elements and Sr-Nd isotopic geochemistry, has been done to volcanic rock from Linzizong Group in Zhunuo area in middle Gangdise belt. We obtain Linzizong Group volcanic rock LA-ICP-MS zircon U-Pb data showing the following ages: the Dianzhong Formation, 64.8±1.6 Ma, the Nianbo Formation, 59.7±1.8 Ma, the Pana Formation, 48.9±0.8 Ma. The data of elementary and isotopic geochemistry suggest that the characteristics of these formations in Zhunuo area are similar to regional characteristics. Among them, Dianzhong and Nianbo formations are calc-alkalic and high-K calc-alkalic rocks with characteristics of arc-island volcanic rocks. Pana Formation contains shoshonite and is syn-collision volcanic rock. It is proved that suture of the Yarlung Zangbo oceanic basin and the beginning of collision between India and Asia were about 50 Ma.
- zircon U-Pb age,
- geochemistry,
- Linzizong Group volcanic rock,
- middle Gangdise belt

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Zircon U-Pb Ages and Geochemistry of Volcanic Rock from Linzizong Group in Zhunuo Area in Middle Gangdise Belt, Tibet Plateau

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