LATE PALEOZOIC OCEAN-CONTINENT TRANSITION IN WEST JUNGGAR, CENTRAL ASIAN OROGENIC BELT:EVIDENCE FROM LATE CARBONIFEROUS RHYOLITES

SHI Jian-jie; CHEN Xuan-hua; DING Wei-cui; LI Bing

Volume 23 Issue 1

Feb. 2017

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SHI Jian-jie, CHEN Xuan-hua, DING Wei-cui, et al., 2017. LATE PALEOZOIC OCEAN-CONTINENT TRANSITION IN WEST JUNGGAR, CENTRAL ASIAN OROGENIC BELT:EVIDENCE FROM LATE CARBONIFEROUS RHYOLITES. Journal of Geomechanics, 23 (1): 150-160.

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LATE PALEOZOIC OCEAN-CONTINENT TRANSITION IN WEST JUNGGAR, CENTRAL ASIAN OROGENIC BELT:EVIDENCE FROM LATE CARBONIFEROUS RHYOLITES

Chinese Academy of Geological Science, Beijing 100037, China

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Received: 2016-10-12
Published: 2017-02-01

Abstract

Abstract

The late carboniferous rhyolites with columnar joints have been found in the West Junggar, then we studyed their tectonic environment through the geochemical characteristics. The rhyolites from the West Junggar have the characteristics of high K, low Na, so they belong to high-k calc-alkaline or cala-alkaline magmatic series. According to the Ⅴ patterns of the REE distribution patterns of the rhyolites, Eu is deficited, testifying the process of the crystallization differentiation of plagioclase. The rhyolites are enrichment of elements Rb、K (LILE), and deficient of Nb、Ta(HFSE), this is same to the characteristic of subduction zone magma. The study shows that the rhyolites which belong to A2 rock type derived from post-orogenic tectonic environment. The rhyolites and granites batholith have the same magmatic source and both belong to rich alkaline magmatism in orogenic environment. Similarly to the environment of the rhyolites in the east China, the study proves the existence of sea-land transition zone during the late Paleozoic, indicating that the Junggar Oceanic Plate subducted under the Kazakhstan Plate. Ocean subduction mainly developed in Karamay-Baogutu area, where the Junggar oceanic plates subducted to the northwest under the Kazakhstan plates. The rich alkaline magmatism in the post-orogenic stretch environment which the late carboniferous rhyolites with columnar joins occured, put an end to the ocean-land transition environment.
- the West Junggar,
- rhyolites,
- geochemical charateristics,
- ocean-land transition,
- tectonic evolution

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