| 何保,李莹,杨仲杰.大兴安岭博克图地区中生代火山岩地质特征及地质意义[J].地质找矿论丛,2019,34(1):92-103 |
| 大兴安岭博克图地区中生代火山岩地质特征及地质意义 |
| Basic characteristics and geological significance of Mesozoic volcanic rocks in Boktu area of the Daxinganling |
| 投稿时间：2018-07-09 |
| DOI：10.6053/j.issn.1001-1412.2019.01.014 |
| 中文关键词: 博克图地区 中生代火山岩 地球化学特征 岩浆来源 伸展环境 大兴安岭 |
| 英文关键词:Boktu area Mesozoic volcanic rocks geochemical characteristics source of magma extensional environment Daxinganling |
| 基金项目:国家自然科学基金项目（编号：51304114、41672247）、辽宁教育厅项目（编号：LJ2017FAL016）联合资助。 |
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| 中文摘要: |
| 博克图属大兴安岭火山岩带中部，中生代火山岩浆作用强烈，广泛分布中生代陆相火山岩地层。文章通过对火山岩地层的岩石学特征、地球化学特征研究，探讨了博克图地区中生代火山岩成因及其构造环境。结果表明：1）博克图地区塔木兰沟组以玄武岩和粗面岩为主，满克头鄂博、玛尼吐组和白音高老组以流纹岩为主。2）塔木兰沟组火山岩源区为受俯冲流体交代形成的富集型岩石圈地幔；玛尼吐组-白音高老组火山岩的岩浆来源于下地壳基性岩浆，并且受到了上地壳物质的混染。3）博克图地区中生代火山岩形成于岩石圈伸展和减薄环境，岩浆演化与蒙古-鄂霍茨克洋闭合造山后的伸展环境有关。 |
| 英文摘要: |
| Boktu area is situated at middle of Daxinganling volcanic rock belt and Mesozoic volcanism-magmatism very strong. Continental volcanic strata are widely distributed. Genesis and tectonic environment are studied on the petrological and geochemical characteristics of the volcanic strata. The result shows that Tamulangou formation in Boktu area is dominated by basalt and trachyte; Manketouebo Formation, Manitu Formation and Baiyingaolao Formation by rhyolite; 2)source area of volcanic rock of Tamulangou fromation is derived from the hydrothermal fluid metasomatic enrichment lithospheric mantle during subduction, and the volcanic rocks in Manitu Formation-Baiyingaolao Formation from lower crustal basic magma and is disseminated with crustal materials; 3)Mesozoic volcanic rocks in Boktu area is formed under lithospheric extension and thining environment and the magma evolution related to post Mongol-Okhotsk Ocean closure extension enviroment. |
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