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东南亚新生代两类埃达克岩的分布、成因和含矿性

朱章显 杨振强

朱章显, 杨振强, 2008. 东南亚新生代两类埃达克岩的分布、成因和含矿性. 地质力学学报, 14 (4): 328-338.
引用本文: 朱章显, 杨振强, 2008. 东南亚新生代两类埃达克岩的分布、成因和含矿性. 地质力学学报, 14 (4): 328-338.
ZHU Zhang-xian, YANG Zhen-qiang, 2008. DISTRIBUTION, ORIGIN AND MINERALIZATION OF TWO TYPES OF CENOZOIC ADAKITE AND ADAKITE-LIKE ROCKS IN SOUTHEASTERN ASIA. Journal of Geomechanics, 14 (4): 328-338.
Citation: ZHU Zhang-xian, YANG Zhen-qiang, 2008. DISTRIBUTION, ORIGIN AND MINERALIZATION OF TWO TYPES OF CENOZOIC ADAKITE AND ADAKITE-LIKE ROCKS IN SOUTHEASTERN ASIA. Journal of Geomechanics, 14 (4): 328-338.

东南亚新生代两类埃达克岩的分布、成因和含矿性

基金项目: 

中国地质调查局“中国大陆周边地区主要成矿带成矿规律对比及潜力评价”项目 1212010661308

详细信息
    作者简介:

    朱章显(1959-), 男, 硕士, 四川省威远县人。地质矿产高级工程师。长期从事区调及矿产普查工作。现从事境外地质矿产编图工作。E-mail:zzx765000@sina.com。联系电话:13986833460

  • 中图分类号: P581

DISTRIBUTION, ORIGIN AND MINERALIZATION OF TWO TYPES OF CENOZOIC ADAKITE AND ADAKITE-LIKE ROCKS IN SOUTHEASTERN ASIA

  • 摘要: 东南亚的巽他群岛-巴布亚新几内亚是新生代埃达克岩和类埃达克岩发育的地区。这些中酸性岩浆岩广泛见于印度尼西亚几内亚岛、苏拉威西和巴布亚新几内亚, 零星见于苏门答腊、班达岛弧、西爪哇和中加里曼丹等地。本区埃达克岩和类埃达克岩岩石类型分别属于岛弧拉斑钙碱性系列和高钾钙碱性系列, 以重稀土元素Y, Yb含量低(分别为Y ≤19 ×10-6和Yb ≤1.8 ×10-6)和高Sr值(>355 × 10-6)为特征。微量元素蛛网图上有明显的Ba、K、Sr正异常峰和负的Th、Nb (Ta)异常谷。大离子亲石元素(LILE)和高场强元素(HFSE)相对富集。本区埃达克岩和类埃达克岩的构造位置为新生代缝合线附近的大洋岛弧和陆缘造山带, 可划分为两种成因类型:第一种为岛弧拉斑/钙碱性系列, 其REE配分模式属于大洋岛弧型, 见于现代大洋岛弧, 称为岛弧型(O-型)埃达克岩; 另一种为高钾钙碱性系列, 其REE配分模式属于大陆型, 产于大陆板块边缘造山带, 与弧-陆碰撞和后碰撞构造环境有成因联系, 见于大陆边缘, 称为大陆型(C-型)埃达克岩。 研究结果表明:大陆型(C-型)埃达克岩和类埃达克岩分布区域与世界级斑岩铜-金矿分布相一致, 而大洋岛弧型(O-型)主要与浅成热泉金矿和喷气型有成因联系。

     

  • 图  1  埃茨贝格矿区(Gunung Bijih矿床)位于伊里安查亚的中央山脉内[8], 细点区域表示高程大于1000米

    矿床的符号:▲=斑岩Au±Cu系统, ●=Au矿床, EB =埃茨贝格, OT =奥克太迪, FR =费里达河, HV =海登谷, LD=拉多拉姆(利希岛), PG =潘古纳(布尔干维尔岛), MI =米西岛, PR=波格拉

    Figure  1.  Map showing the location of the Ertsberg mine (Gunung Bijih deposit) within the Central Ranges of Irian Java[8]. Stippled area shows elevations of more than 1000 m

    Other deposits are shown for reference:▲=porphyry Au±Cu systems, ●=Au deposits, EB =Ertsberg, OT=Ok Tedi, FR= Freida River, HV=Hidden Valley, LD =Ladolam (Lihir Island), PG =Panguna (Bougainville Island), MI =Misima Island, PR=Porgera

    图  2  苏拉威西的构造图(表示主要的岩石层序和断层) [22]

    Figure  2.  Generalized tectonic map of Sulawesi, showing major lithologic sequences and faults[22]

    图  3  东南亚地区埃达克岩微量元素分蛛网图

    □大洋型埃达克岩; △大陆型埃达克岩(包括类埃达克花岗闪长岩); ■岛弧型安山岩

    Figure  3.  Spider diagram for trace elements in southeastern Asia

    表  1  埃茨贝格矿田和哈马黑拉岛弧代表性埃达克岩地球化学特征

    Table  1.   The geochemical characteristics of adakite and adakite-like rocks from Ertsberg area and Halmahera island arc

    表  2  巴布亚新几内亚代表性埃达克岩和类埃达克岩的地球化学特征

    Table  2.   The geochemical characteristics of typical adakite and adakite-like rocks from Papua New Guinea

    表  3  北新几内亚-新不列颠岛弧代表性O-型埃达克岩和类埃达克岩的地球化学特征

    Table  3.   The geochemical characteristics of O-type adakite and adakite-like rocks from North New Guinea-New Britain island arc

    表  4  阿德默勒尔蒂群岛—所罗门群岛弧代表性O-型埃达克岩和类埃达克杂岩体的地球化学特征

    Table  4.   The geochemical characteristics of O-type adakite and adakite-like rocks from Admiralty-Solomon island arc

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  • 收稿日期:  2008-02-03
  • 刊出日期:  2008-12-28

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