地质科学2012，Vol.47Issue(4)：993-1004,12.
准噶尔盆地中拐地区石炭—二叠纪火山岩特征及构造环境分析
Geochemical characteristics and tectonic setting of the Carboniferous-Permian volcanic rocks in Zhongguai area northwestern Junggar Basin
摘要
Abstract
Zhong-Guai area is located in the Northwest margin of Junggar Basin, it is a broad nose palaeohigh formed in compressional stress field of Carboniferous Early Permain Period. Carboniferous-Permain volcanic rock is one of the mainly oil-bearing series, until now many hydrocarbon reservoirs and oil entry points are discovered, and showing good exploration prospects. According to systematic and elaborate seismic data interpretation, Zhong-Guai area have four tectonic movements in the Carboniferous-Permian period, corresponding to four unconformity respectively: 1 ) Between the Carboniferous and Permian system; 2) Between the Jiamuhe and Xiawuerhe Formation of Permian system; 3 ) Between the Xiawuerhe and Shangwuerhe Formation of Permian system; 4) Between the Xiawuerhe Formation of Permian system and Baikouquan Formation of Triassic system. The rock element analysis shows that the research area are mainly neutral-acidic andesites, quartz andesite , rhyolite, volcanic breccia and tuff,the content of SiO, are generally high, the average content is 66. 840%. It is considered that the volcanic eruption environment of Carboniferous-Permain system in research area is inside mainland of island arc system, in the eruption process it experienced the molten role of continental crust. Combining previous study of circumferential volcanic rocks, it is considered that the evolution of Zhong-Guai area in Carboniferous-Permain period is from island arc to intracontinent, and in Triassic period it began to enter into the stable sedimentary evolution period.关键词
全岩元素分析/石炭—二叠系火山岩/中拐地区/准噶尔盆地西北缘Key words
The rock element analysis, Carboniferous-Permain volcanic rock, Zhong- Guai area, The northwest margin of Junggar Basin分类
天文与地球科学引用本文复制引用
孙国强,史基安,张顺存,陈吉,贾艳艳..准噶尔盆地中拐地区石炭—二叠纪火山岩特征及构造环境分析[J].地质科学,2012,47(4):993-1004,12.基金项目
国家重大专项"准噶尔盆地深层火山岩储集体形成演化与分布预测"(编号:2011ZX05008-003-40)资助. （编号:2011ZX05008-003-40）
