龙登红,王思成,郝贺超,慕旭峰,王亮亮,梁明宏,高晓峰.新疆博格达中段木垒地区七角井组火山岩岩石地球化学特征及构造意义[J].西北地质,2020,53(1):13-23 LONG Denghong,WANG Sicheng,HAO Hechao,MU Xufeng,WANG Liangliang,LIANG Minghong,GAO Xiaofeng.Geochemical Features and Tectonic Significance of Volcanic Rock in Qijiaojing Group of Middle Section of Bogda, Xinjiang[J].Northwestern Geology,2020,53(1):13-23
新疆博格达中段木垒地区七角井组火山岩岩石地球化学特征及构造意义
Geochemical Features and Tectonic Significance of Volcanic Rock in Qijiaojing Group of Middle Section of Bogda, Xinjiang
投稿时间:2019-07-03  修订日期:2019-11-18
DOI:10.19751/j.cnki.61-1149/p.2020.01.002
中文关键词:  博格达;木垒;七角井组;双峰式火山岩;弧后裂陷盆地
英文关键词:Bogda;Mulei;Qijiaojing group;bimodal volcanic rocks;the basin of back-arc rift
基金项目:新疆地质勘查基金项目管理中心中央返还两权价款项目"新疆木垒县白杨河一带1:5万K46E002001、K46E002002、K46E003002三幅区域地质矿产调查"(T16-1-LQ10)
作者单位
龙登红 甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃 天水 741020 
王思成 甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃 天水 741020 
郝贺超 甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃 天水 741020 
慕旭峰 甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃 天水 741020 
王亮亮 甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃 天水 741020 
梁明宏 甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃 天水 741020 
高晓峰 中国地质调查局西安地质调查中心/西北地质科技创新中心, 陕西 西安 710054 
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中文摘要:
      博格达构造带木垒地区早石炭世七角井组内发育大量双峰式火山岩,火山岩的SiO2含量在48%~65%之间出现明显的间断,具有Daly成分间断。其玄武岩具有贫K富Na、富Ti、富Al和Mg的特征,K2O/TiO2、K2O/P2O5值高且变化范围较大,总体显示玄武质岩浆后期存在轻度地壳混染作用;英安岩具有贫K富Na、低Ti和P,和共生玄武岩的特征不同。玄武岩轻稀土中度富集,轻、重稀土元素之间存在中等分异;英安岩相对于玄武岩,稀土元素总量高于2~3倍,轻重稀土分异明显,显示为右倾且斜率较大的配分模式,具有较强的负Eu异常(δEu=0.89~0.93)。玄武质岩浆可能为亏损地幔的部分熔融作用形成,英安质岩浆可能为地壳物质重熔形成。综合分析认为博格达早石炭世处于弧后裂陷盆地环境。
英文摘要:
      A large number of bimodal volcanic rocks are formed in the Carboniferous Qijiaojing group in Mulei areas, Bogda tectonic zone, The SiO2 content of the volcanic rocks is obviously interrupted between 48% and 65%, with a discontinuous Daly component. Its basalt is characterized by depleted potassium,and rich in sodium, Ti, Al and Mg. The ratio of K2O/TiO2 and K2O/P2O5 is high and the variation range is large. As a whole, there is mild crustal contamination in the later stage of basaltic magma. Meanwhile, dacite has the characteristics of depleted potassium, rich sodium, and low Ti and P, which is different from basalt. The basalt light rare earth is moderately enriched, and the light and heavy rare earth elements are moderately different; the dacite is higher than the basalt, the total amount of rare earth elements is 2~3 times higher, and the light and heavy rare earths are distinctly different. It has a strong negative anomaly (δEu=0.89~0.93). The basaltic magma may be formed by partial melting of the depleted mantle, and the dacitic magma may be formed by remelting the crustal material. Based on the comprehensive analysis, the Early Carboniferous in Bogda is in the post-arc rift basin environment.
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