东天山觉罗塔格构造带石炭纪弧后盆地:来自基性火山岩的证据

罗婷; 陈继平; 廖群安; 王国灿; 张雄华; 张随安; 康琴琴

doi:10.3799/dqkx.2018.325

Volume 45 Issue 1

Jan. 2020

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Article Navigation > Earth Science > 2020 > 45(1): 194-210

Luo Ting, Chen Jiping, Liao Qun'an, Wang Guocan, Zhang Xionghua, Zhang Suian, Kang Qinqin, 2020. A Back-Arc Basin in Eastern Tianshan, Central Asia: Evidence from Geochronology and Geochemistry of Carboniferous Basalts. Earth Science, 45(1): 194-210. doi: 10.3799/dqkx.2018.325

Citation:

Luo Ting, Chen Jiping, Liao Qun'an, Wang Guocan, Zhang Xionghua, Zhang Suian, Kang Qinqin, 2020. A Back-Arc Basin in Eastern Tianshan, Central Asia: Evidence from Geochronology and Geochemistry of Carboniferous Basalts. Earth Science, 45(1): 194-210. doi: 10.3799/dqkx.2018.325

Citation:

Luo Ting, Chen Jiping, Liao Qun'an, Wang Guocan, Zhang Xionghua, Zhang Suian, Kang Qinqin, 2020. A Back-Arc Basin in Eastern Tianshan, Central Asia: Evidence from Geochronology and Geochemistry of Carboniferous Basalts. Earth Science, 45(1): 194-210. doi: 10.3799/dqkx.2018.325

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A Back-Arc Basin in Eastern Tianshan, Central Asia: Evidence from Geochronology and Geochemistry of Carboniferous Basalts

doi: 10.3799/dqkx.2018.325

1.
Shaanxi Experimentation Center of Geological Survey, Xi'an 710054, China
2.
Shaanxi Institute of Geological Survey, Xi'an 710054, China
3.
Shaanxi Hydrogeology Engineering and Environment Geology Survey Center, Xi'an 710054, China
4.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-09-04
Publish Date: 2020-01-15

Abstract

Abstract

Carboniferous volcanic rocks are widely distributed in the Jueluotage belt of eastern Tianshan, located in the southern Central Asian Orogenic Belt. The petrogenesis and tectonic history of this region have long been a matter of debate. Data on major and trace elements and Sr-Nd isotopes of whole rocks, and in-situ U-Pb age of zircons are reported for Carboniferous volcanic rocks in the Juluotage area in this paper. The main results are obtained as follows:(1) These volcanic rocks erupted in two episodes, with zircon U-Pb ages of ca. 336 Ma and ca. 320 Ma respectively. The ca. 336 Ma volcanic rocks are dominated by arc-like igneous rocks. They show enrichment of light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), and depletion of high field-strength elements (HFSEs) according to the N-MORB-normalized and chondrite-normalized diagrams. However, the ca. 320 Ma volcanic rocks mainly consist of MORB-like igneous rocks that show nearly flat REE patterns. They are also slightly enriched in LILEs and LREEs according to the N-MORB-normalized and chondrite-normalized diagrams. (2) The inherited zircon ages of volcanic rocks from the Jueluotage belt show similar trends and features to those of the Central Tianshan Block, suggesting they shared the same basement, at least before the Early Carboniferous. (3) These Carboniferous volcanic rocks are geochemically similar to the back-arc basin basalt (BABB) from the Mariana and Okinawa troughs. The evolution from arc-like volcanic rocks to MORB-like volcanic rocks reflects the development of the back-arc basin in the northern Central Tianshan Block during the Carboniferous. The subduction of the Tianshan Ocean ended at the end of the Late Carboniferous period. The final closure of the main ocean and back-arc basins is likely to be south of the Central Tianshan mountain.
- volcanic rocks,
- Carboniferous,
- petrogenesis,
- back-arc basin,
- eastern Tianshan,
- petrology

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References(50)

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