A STUDY ON ZIRCON LA-ICP-MS U-PB AND <sup>40</sup>AR/<sup>39</sup>AR AGES OF VOLCANIC ROCKS FROM KENDEKEKE, QIMANTAGE AND THE GEOLOGICAL SIGNIFICANCE

MA Shuai; CHEN Shiyue; SUN Jiaopeng; WANG Feng; SHAN Tengfei

2017 Vol. 23, No. 4

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MA Shuai, CHEN Shiyue, SUN Jiaopeng, WANG Feng, SHAN Tengfei. A STUDY ON ZIRCON LA-ICP-MS U-PB AND 40AR/39AR AGES OF VOLCANIC ROCKS FROM KENDEKEKE, QIMANTAGE AND THE GEOLOGICAL SIGNIFICANCE[J]. Journal of Geomechanics, 2017, 23(4): 558-566.

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MA Shuai, CHEN Shiyue, SUN Jiaopeng, WANG Feng, SHAN Tengfei. A STUDY ON ZIRCON LA-ICP-MS U-PB AND ⁴⁰AR/³⁹AR AGES OF VOLCANIC ROCKS FROM KENDEKEKE, QIMANTAGE AND THE GEOLOGICAL SIGNIFICANCE[J]. Journal of Geomechanics, 2017, 23(4): 558-566.

A STUDY ON ZIRCON LA-ICP-MS U-PB AND ⁴⁰AR/³⁹AR AGES OF VOLCANIC ROCKS FROM KENDEKEKE, QIMANTAGE AND THE GEOLOGICAL SIGNIFICANCE

1.
College of Earth Science and Technology, China University of Petroleum, Qingdao 266555, Shandong, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China

Received Date: 31 December 2016

Publish Date: 25 August 2017

Abstract

Abstract

Zircon LA-ICP-MS U-Pb dating and ⁴⁰Ar/³⁹Ar dating were made on the volcanic samples of Qigaisu group from Kendekeke in upper Devonian. Combined with regional geological features, multicyclic tectonic evolution of Qimantag tectonic zone are summarized and analyzed. The results show that, rhyolites in Qigaisu group formed in late Devonian(384.9±6.0 Ma), while Qigaisu group formed no later than late Devonian. The two inherited zircon ages 767±15 Ma and 915±18 Ma certify that the study area responded to supercontinent aggregation-cracking, but evidence from stratum, sedimentation, metamorphism and deformation do not support the existence of the late Paleozoic ocean or aulacogen in Qimantag area, and Qimantag area in late Paleozoic was an epeiric sea located at the southwest margin of Qaidam. The ⁴⁰Ar/³⁹Ar effective plateau age of the samples is 220.3±1.7 Ma, which shows the latest burial depth is about 8000 m. Large-scale uplift events happened after the late Triassic volcanism, multiphase tectonic events, such as late Indosinian, Yanshanian and Himalayanian, caused the lack of large-scale settlement in Mesozoic and Cenozoic. Intra-continent orogeny lasted to 32 Ma or so. Because of the extension of Kumukuli basin afterwards, Qimantage orogenic belt separated from East Kunlun orogenic belt.
- Kendekeke /
- volcanic rock /
- zircon U-Pb age /
- ⁴⁰Ar/³⁹Ar age /
- geological significance

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References

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