Juxtaposition of adakite, boninite, high-TiO2 and low-TiO2 basalts in the Devonian southern Altay, Xinjiang, NW China
文献类型：期刊论文
| 作者 | Niu, Hecai; Sato, Hiroaki; Zhang, Haixiang; Ito, Jun'ichi; Yu, Xueyuan; Nagao, Takashi; Terada, Kentaro; Zhang, Qi |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2006-12-15 |
| 卷号 | 28期号:4-6页码:439-456 |
| 关键词 | Altay boninite adakite basalts Devonian |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2005.11.010 |
| 文献子类 | Article |
| 英文摘要 | We present petrographic and geochemical data on representative samples of the Devonian adakite, boninite, low-TiO2 and high-TiO2 basalts and associated rocks in the southern Allay areas, Xinjiang, NW China. These volcanic rocks mostly occur as tectonic blocks within suture zones between the Siberian and Junggar plates. Adakite occurs in the Suoerkuduke area ca. 40 km south of Fuyun, and actually represents a poorly-sorted massive volcaniclastic deposit, mostly consisting of a suite of homblende andesite to pyroxene andesite. The geochemical features of the adakite suggest its generation by melting of subducted oceanic crust. Boninite occurs in the Saerbulake area ca. 20 km southwest of Fuyun, as pillowed lava or pillowed breccia. It is associated with high-TiO2 basalt/gabbro and low-TiO2 basalt. The boninites are metamorphosed, but contain relict clinopyroxene with Mg# (= 100*Mg/(Mg+Fe)) of 90-92, and Cr2O3 contents of 0.5-0.7 wt% and chromian spinel with Cr/(Cr+Al) ratio of 0.84. The bulk rock compositions of the boninites are characterized by low and U-shaped REE with variable La/Yb ratios. They are classified as high-Ca boninite. The Cr-rich cpx phenocryst and Chromian spinel suggests that the boninites were formed by melting of mildly refractory mantle peridotite fluxed by a slab-derived fluid component under normal mantle potential temperature conditions. Basaltic rocks occur as massive flows, pillowed lavas, tuff breccia, lapilli tuff and blocks in tectonic melanges. Together with gabbros, the basaltic rocks are classified into high-TiO2 (> 1.7 wt%) and low-TiO2 (< 1.5 wt%) types. They show variable trace element compositions, from MORB-type through transitional back-arc basin basalt to arc tholeiite, or within plate alkalic basalt. A notable feature of the Devonian formations in the southern Allay is the juxtaposition of volcanic rocks of various origins even within a limited area; i.e. the adakite and the boninites are associated with high-TiO2 and low-TiO2 basalts and/or gabbros, respectively. This is most likely produced by complex accretion and tectonic processes during the convergence in the Devonian-Carboniferous paleo-Asian Ocean between the Siberian and Junggar plates. (c) 2006 Elsevier Ltd. All rights reserved. |
| WOS关键词 | MARIANA FORE-ARC ; CONTINENTAL GROWTH ; CRUSTAL GROWTH ; NORTHERN XINJIANG ; KUNLUN MOUNTAINS ; NORTHWEST CHINA ; OPHIOLITE ; GEOCHEMISTRY ; PETROGENESIS ; EVOLUTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000243247600017 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66730]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Sato, Hiroaki |
| 作者单位 | 1.Kobe Univ, Grad Sch Sci & Technol, Dept Earth & Planetary Sci, Nada Ku, Kobe, Hyogo 6578501, Japan 2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Yamaguchi Univ, Fac Sci, Dept Earth Sci, Yamaguchi 7538526, Japan 4.Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Niu, Hecai,Sato, Hiroaki,Zhang, Haixiang,et al. Juxtaposition of adakite, boninite, high-TiO2 and low-TiO2 basalts in the Devonian southern Altay, Xinjiang, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2006,28(4-6):439-456. |
| APA | Niu, Hecai.,Sato, Hiroaki.,Zhang, Haixiang.,Ito, Jun'ichi.,Yu, Xueyuan.,...&Zhang, Qi.(2006).Juxtaposition of adakite, boninite, high-TiO2 and low-TiO2 basalts in the Devonian southern Altay, Xinjiang, NW China.JOURNAL OF ASIAN EARTH SCIENCES,28(4-6),439-456. |
| MLA | Niu, Hecai,et al."Juxtaposition of adakite, boninite, high-TiO2 and low-TiO2 basalts in the Devonian southern Altay, Xinjiang, NW China".JOURNAL OF ASIAN EARTH SCIENCES 28.4-6(2006):439-456. |
入库方式： OAI收割
来源：地质与地球物理研究所
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