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题名: Compositions and origin of volatiles in Tengchong Cenozoic volcanism from SE margin of the Tibetan Plateau: Constraints from chemical and carbon isotopic compositions of volatiles in volcanic rocks
其他题名: 腾冲新生代火山作用流体组成及其来源—火山岩流体化学组成和碳同位素制约
作者: Yu, M; Tang, QY; Zhang, MJ(张铭杰); He, PP; Shang, H; Li, LW
收录类别: SCIE ; CSCD
出版日期: 2014-12
刊名: ACTA PETROLOGICA SINICA
卷号: 30, 期号:12, 页码:3635-3644
期刊主办单位: 中国矿物岩石地球化学学会 ; 中国科学院地质与地球物理研究所
出版者: SCIENCE CHINA PRESS
出版地: BEIJING
中文摘要: 腾冲新生代火山区是青藏高原唯一幔源挥发份大量排放的火山-地热区,大规模火山作用的流体组成的系统研究具有多方面的科学意义。对腾冲马鞍山、老龟坡和打鹰山等地新生代火山岩进行流体化学组成和碳同位素分析,结果表明腾冲新生代火山岩的流体组成中H2O占有极高的比例,CO2、N2和O2的含量较高,而且不同火山区的流体组成有所差异。CO2的δ13C值为-27.1‰~-7.5‰,位于地壳和地幔范围之间;CH4、C2H6、C3H8和C4H10等甲烷同系物的碳同位素组成随碳数增高具有整体正序、C2H6与C3H8局部反序的分布特征,显示海洋环境I型有机质热裂解成因烃类气体的特征。腾冲火山作用中存在地幔来源的CO2,岩...
英文摘要: The Tengchong Cenozoic volcanic field is characterized uniquely with a large quantity of mantle-derived volatiles emitted from both volcano and geothermal fields in the Tibetan Plateau, Western China. The volatiles in the Cenozoic volcanic events have not been studied systemically for their compositions and origin. In this study, the chemical and carbon isotopic compositions of volatiles in the Cenozoic volcanic rocks were measured for their origins. The results showed H2O as the dominant component with CO2, N-2 and O-2 as major ones in the volatiles of the Tengchong Cenozoic volcanic rocks. The chemical compositions of volatiles varied among different volcanic fields. The delta C-13 values of CO2 were in ranges between -27.1 parts per thousand to -7.5 parts per thousand that was located in the delta C-13 range of crust and mantle, the delta C-13 values of CH4, C2H6, C3H8 and C4H10 etc. methane homologue volatiles show a normal carbon isotopic distribution pattern among CH4 to C4H10 with partial reversal between C2H6 and C3H8, which are the delta C-13 features of thermogenic hydrocarbon gases by thermal decomposition of type I organic materials in oceanic sedimentary. The mantle-derived CO2 were preserved in Tengchong Cenozoic volcanic rocks, and magma undergone the slight CO2 degassing. Carboniferous volatiles were mainly derived from addition of crust volatiles, especially from thermal decomposition of subducted oceanic sedimentary organic materials. Large quantities of H2O could be added from the volatiles of county rocks or recycled fluids during magma ascent. The differences in volatile compositions of different volcano fields could be caused by their distinct magma evolution.
关键词: Origin ; Carbon isotope ; Volatile ; Volcano ; Cenozoic ; Tengchong ; 来源 ; 碳同位素 ; 流体挥发份 ; 火山 ; 新生代 ; 腾冲
作者部门: [Yu Ming ; Tang QingYan ; Zhang MingJie ; He PeiPei ; Shang Hui] Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China ; [Li LiWu] Chinese Acad Sci, Inst Geol & Geophys, Gansu Key Lab Petr Resources, Lanzhou 730000, Peoples R China
通讯作者: Yu, M (reprint author), Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China.
学科分类: Geology
文章类型: Article
所属项目编号: 国家自然科学基金项目(41372095 ; 41072056) ; 教育部科学与技术研究重大项目(311010) ; 中国地质调查局项目(12120114044401) ; 高等学校博士学科点专项科研基金(20120211110023)联合资助
所属项目名称: 国家自然科学基金项目 ; 高等学校博士学科点专项科研基金 ; 教育部科学技术研究重大项目
项目资助者: NSFC ; MOE
语种: 中文
ISSN号: 1000-0569
WOS记录号: WOS:000347270400013
CSCD记录号: CSCD:5306044
IR记录号: CNKI:0004870
第一机构:
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120661
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
Yu, M,Tang, QY,Zhang, MJ,et al. Compositions and origin of volatiles in Tengchong Cenozoic volcanism from SE margin of the Tibetan Plateau: Constraints from chemical and carbon isotopic compositions of volatiles in volcanic rocks[J]. ACTA PETROLOGICA SINICA,2014,30(12):3635-3644.
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