Study on the Distribution and Developmental Environment of the Late Paleozoic Volcanoes in Junggar Basin and Its Adjacent Areas
详细信息
- 责任者：Mao Xiang(Key Laboratory of Orogenic Belts and Crustal Evolution ; Ministry of Education ; School of Earth and Space Science ; Peking University ; Beijing 100871 ; China) ; Li JiangHai
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(8)
- 关键词：火山机体 ; volcanic edifice ; 准噶尔盆地 ; Junggar Basin
- 页码：p.2381-2391
- 图表：illus.,1 table,64 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
This paper collects and analyses the 145 Paleozoic volcanoes in north Xinjiang, including 32 volcanoes on the edge of Junggar Basin, which are clustered mainly in Boluokenu Mountain, Bogeda Mountain, Tuoli gold belt and Kerameili Mountain. They can be divided into 3 classes, such as calderas, volcanic domes and volcano vents (volcano necks). There are also 85 volcanoes in Junggar Basin, which are primarily in the Ke-Bai fractured zone of the northwestern margin of Junggar Basin, 3 depressions (Dongdaohaizi depression, Dishuiquan depression, Sannan depression and Wucaiwan depression) and 7 uplifts (Baijiahai uplift, Beisantai uplift, Dibei uplift, Dinan uplift, Sangequan uplift, Shixi uplift and Xiayan uplift). The volcanoes inside the basin are principally controlled by Hercynian fault systems, along NE and near EW trending faults and most developed in the interjunctions of the faults. The modification by late-stage weathering and leaching made the volcanoes difficult to identify. Remaining volcanic landforms, changing trends of the volcanic lithofacies and the typical volcanic rock, such as the crypto-explosive breccia, are the typical marks of the Late Paleozoic volcanoes in the field; and the concealed volcanic edifices are identified by the techniques of seismic identification, such as seismic slicing, analysis of the attribute and tectonic trend plane. The ages of the volcanic rocks are focused on from 340Ma to 320Ma and from 300Ma to 295Ma,corresponding to the subducting periods of West Junggar and East Junggar. From Early Carboniferous to Late Carboniferous, the volcanic activities in Junggar Basin and its adjacent areas show a variation trend from undersea to continental, from deep water to shallow water and from continental margin to intracontinental.
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