Geochemical properties of the variolitic andesite from Susong in the Dabie orogenic belt, China | |
Fu, YT; Li, JL![]() | |
2001-04-01 | |
发表期刊 | ACTA PETROLOGICA SINICA
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ISSN | 1000-0569 |
卷号 | 17期号:2页码:254-262 |
文章类型 | Article |
摘要 | The variolitic andesite from the Susong County in the Dabie Mountains implies that it was erupted in water. The mineralogy of the varioles is primarily radiate plagioclase (albite sind oligoclase), with little pyroxene, hornblende and quartz (derived from alteration). The pyroxene, hornblende and quartz are in the interstices between plagiocalse. The matrix consists of glass, hornblende, chlorite, epidote and zoisite. It is clearly subjected an extensive alteration. The andesite has an uncommon chemical composition. The SiO2 content is about 56.8%, TiO2 = 0.9%, MgO = 6.4%, Fe2O3 (tot) = 6.7%similar to 7.6%, 100Mg/(Mg + Fe) = 64.1 similar to 66.2. Mg-# is significantly high. The andesite has high abundances of large-lithophile trace elements (e.g. K, Ba. Sr, LREE), e.g. La/Nb = 5.56 similar to 6.07, low abundances of high-strength-field elements (HFSE e.g. Ta, Nb, P, Ti), particularly Ta and Nb strongly depleted. These are consistent with the characteristics of subduction-related magmas. In the spider diagram of trace elements, from Ce to right hand, the abundances of elements decrease quickly, showing a character of the continental margins. There has a strong punishment of light-rare-earth elements, with a significant diffraction of REEs (the mean value of (La/Yb)(N) is 32.84). No Eu anomaly, but there are anomaly high (La/Yb)(N) = 28.63 similar to 36.74, (La/Y)(N) = 70.33 similar to 82.4. The elements Y and Yb are depleted greatly, Y<20 |
关键词 | Dabie Orogenic Belt Variolitic Structure Andesite Island-arc Continental Imargin |
学科领域 | Geology |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000168457600010 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/3812 |
专题 | 海洋地质与环境重点实验室 |
作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Lab Lithosphere Tecton Evolutu, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266701, Peoples R China |
推荐引用方式 GB/T 7714 | Fu, YT,Li, JL,Wu, YG. Geochemical properties of the variolitic andesite from Susong in the Dabie orogenic belt, China[J]. ACTA PETROLOGICA SINICA,2001,17(2):254-262. |
APA | Fu, YT,Li, JL,&Wu, YG.(2001).Geochemical properties of the variolitic andesite from Susong in the Dabie orogenic belt, China.ACTA PETROLOGICA SINICA,17(2),254-262. |
MLA | Fu, YT,et al."Geochemical properties of the variolitic andesite from Susong in the Dabie orogenic belt, China".ACTA PETROLOGICA SINICA 17.2(2001):254-262. |
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