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东天山博格达晚石炭世双峰式火山岩地球化学特征及意义
Geochemical characteristics and significance of Late Carboniferous bimodal volcanic rocks in Bogda area, Eastern Tianshan Mountains
投稿时间:2020-03-22  修订日期:2020-05-28
中文关键词:东天山  博格达  晚石炭世  柳树沟组  双峰式火山岩  地球化学  成因
英文关键词:Eastern Tianshan Mountains  Bogda  Late Carboniferous  Liushugou Formation  bimodal volcanic rocks  geochemistry  genesis
基金项目:新疆维吾尔自治区地质勘查基金项目(A14-1-LQ03);国家自然科学基金项目(41472310)
作者单位
刘亮 攀枝花市自然资源和规划局, 四川 攀枝花 617000
四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621010 
李江涛 乐山市自然资源局, 四川 乐山 614000 
江辉 四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621010 
杨宇东 四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621010 
何文劲 四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621010 
王莲 四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621010 
王傅佳 四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621010 
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中文摘要:
      东天山博格达造山带晚石炭世柳树沟组为一套由玄武岩和流纹岩组成的双峰式火山岩,形成于晚石炭世,其SiO2含量介于46.18%~46.56%和76.06%~76.25%之间,具有明显的Daly成分间断。其中,玄武岩具富Na贫K特征,TiO2、Al2O3、CaO和MgO含量均较高,∑REE为75.54×10-6~80.22×10-6,LREE/HREE值为3.00~3.12,以富集Ba、Rb等大离子亲石元素(LILE)和不相容元素(P、K),相对亏损Ti、Ta、Nb等高场强元素(HFSE)和不相容元素(U、Th)为特征;流纹岩Na2O/K2O值为0.32~0.36,属低Ti、低Mg类流纹岩,∑REE为520.72×10-6~595.26×10-6,LREE/HREE值为5.60~6.53,具有Rb、Th、K、La、Ce、Zr、Hf、Sm等元素的富集以及Ba、U、Ta、Nb、Sr、P和Ti元素的亏损特征。柳树沟组双峰式火山岩形成于大陆裂谷环境,具板内成因特征,玄武岩可能为亏损尖晶石相地幔橄榄岩向石榴石相地幔橄榄岩过渡相较高程度部分熔融的产物,受到地壳物质混染;流纹岩具典型的A型花岗岩的地球化学特征。
英文摘要:
      The Late Carboniferous Liushugou Formation in the Bogda orogenic belt of the Eastern Tianshan Mountains is a bimodal volcanic rock composed of basalt and rhyolite, which was formed in the Late Carboniferous. Its SiO2 content is between 46.18%~46.56% and 76.06%~76.25%, with obvious Daly component discontinuity. Basalt is characterized by rich sodium and poor potassium. Its TiO2, Al2O3, Cao and MgO values are high, ΣREE is 75.54×10-6~80.22×10-6, LREE/HREE is 3.00~3.12, with enrichment of Ba,Rb and other large-distance lithophile elements (LILE) and incompatible elements (P,K), and relative loss of Ti, Ta, Nb and other high field strength elements (HFSE) and incompatible elements (U,Th). The Na2O/K2O ratio of rhyolite is 0.32~0.36, suggesting low titanium (Ti) and low magnesium (Mg) rhyolite. The ∑REE is 520.72×10-6~595.26×10-6, and the LREE/HREE is 5.60~6.53, which shows the enrichment of Rb, Th, K, La, Ce, Zr, Hf, Sm and other elements and the loss of Ba, U, Ta, Nb, Sr, P and Ti elements. The bimodal volcanic rocks of Liushugou Formation were formed in a continental rift environment with intraplate genetic characteristics. Basalts may be the product of partial melting of the transition phase from depleted spinel mantle peridotite to garnet mantle peridotite, which was contaminated by crustal materials. Rhyolites have typical geochemical characteristics of A-type granites.
刘亮,李江涛,江辉,杨宇东,何文劲,王莲,王傅佳,2020,东天山博格达晚石炭世双峰式火山岩地球化学特征及意义[J].岩石矿物学杂志,(5):525~538.
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