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    沙捞越古晋地区伦杜基性岩的形成时代、地球化学特征及其地质意义

    房旭东 张爱梅 王岳军 胡祥云 钱鑫 何慧莹 陈敏

    房旭东, 张爱梅, 王岳军, 胡祥云, 钱鑫, 何慧莹, 陈敏, 2021. 沙捞越古晋地区伦杜基性岩的形成时代、地球化学特征及其地质意义. 地球科学, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048
    引用本文: 房旭东, 张爱梅, 王岳军, 胡祥云, 钱鑫, 何慧莹, 陈敏, 2021. 沙捞越古晋地区伦杜基性岩的形成时代、地球化学特征及其地质意义. 地球科学, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048
    Fang Xudong, Zhang Aimei, Wang Yuejun, Hu Xiangyun, Qian Xin, He Huiying, Chen Min, 2021. Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak. Earth Science, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048
    Citation: Fang Xudong, Zhang Aimei, Wang Yuejun, Hu Xiangyun, Qian Xin, He Huiying, Chen Min, 2021. Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak. Earth Science, 46(6): 2133-2144. doi: 10.3799/dqkx.2020.048

    沙捞越古晋地区伦杜基性岩的形成时代、地球化学特征及其地质意义

    doi: 10.3799/dqkx.2020.048
    基金项目: 

    自然资源部第三海洋研究所基本科研业务费 海三科2018002

    国家自然科学基金项目 41506050

    广东省基础与应用基础研究基金 2019B1515120019

    详细信息
      作者简介:

      房旭东(1983-), 男, 博士, 主要从事地球物理研究. ORCID: 0000-0003-1392-8054. E-mail: fangxudong@tio.org.cn

      通讯作者:

      张爱梅, E-mail: zhangaimei@tio.org.cn

    • 中图分类号: P548

    Geochronoloy and Geochemical Characteristics of Lundu Mafic Rocks in Kuching Area, Sarawak

    • 摘要: 加里曼丹岛作为南海南部最大的岛屿,处于印度-澳大利亚板块、欧亚板块和菲律宾海板块的汇聚带,具有复杂的构造演化史.西加里曼丹岛古晋地区晚白垩世岩浆作用强烈,虽然该期基性岩分布少,但其成因研究对探讨西加里曼丹晚白垩纪构造演化过程具有重要意义.对古晋地区伦杜基性岩开展了详细的岩石学、年代学和地球化学研究,结果表明,该地区基性岩的岩石组成主要为辉绿岩和含橄榄石辉长岩,其中辉绿岩锆石定年显示其结晶年龄为83.4±0.9 Ma,说明岩体侵位于晚白垩世.岩石具有较为均一的SiO2(52.01%~52.38%),大部分样品具有较低的TiO2含量(0.81%~0.92%),K2O含量(0.37%~0.53%)和较高的Al2O3(14.00%~14.54%)、MgO(7.40%~7.86%).微量元素分析结果显示具有较低的稀土元素总量(∑REE=43.96×10-6~48.19×10-6),呈LREE轻度富集的平坦型配分模式,富集大离子亲石元素,亏损Nb、Ta和Ti等高场强元素.(87Sr/86Sr)i=0.705 1~0.705 3,εNdt)=2.1~3.3.综合分析表明,伦杜基性岩来源于受到俯冲沉积物和板片流体交代改造影响的地幔源区,并结合前人数据推测伦杜基性侵入岩形成于古太平洋俯冲格局下的弧后盆地构造背景,可能与中国东南沿海-海南-越南构成一条俯冲带.

       

    • 图  1  加里曼丹岛所在地理位置图(改自Hall,2012)

      Fig.  1.  Location of Kalimantan Island (modified from Hall, 2012)

      图  2  (a) 加里曼丹岛图;(b)西加里曼丹岛大地构造简图;(c)古晋地区概况及采样点位置

      a.改自Breitfeld et al., 2017;b.改自Hennig et al., 2017;c.改自Aftab et al., 2017

      Fig.  2.  Simplified map of Kalimantan (a), simplified geological map in West Sarawak (b), geological map of Kuching area showing the sampling locations (c)

      图  3  伦杜基性岩体野外及镜下特征照片

      a.闪长岩脉侵入基性岩体;b.辉绿岩手标本;c.辉绿岩显微照片;d.含橄榄石辉长岩显微照片;Ol.橄榄石;Cpx.单斜辉石;Pl.斜长石

      Fig.  3.  Field photographs and photomicrographs from the Lundu mafic rocks, Sarawak

      图  4  (a) 沙捞越伦杜辉绿岩(17SA-47A1)锆石U-Pb谐和图和(b)锆石稀土元素球粒陨石配分模式图

      Fig.  4.  Concordia diagram of zircons U-Pb dating from the Lundu mafic rocks (17SA-47A) (a) and chondrite-normalized REE patterns from the Lundu mafic rocks, Kuching (b)

      图  5  伦杜基性岩SiO2-K2O+Na2O(a)和Zr-Y判别(b)图解

      a据Le Bas et al.(1986);b据Barrett et al.(1994);华南内陆基性岩数据来自Wang et al.(2003);海南岛基性岩数据来自葛小月等(2003);东南沿海基性岩来自Xie et al.(2006)Chen et al.(2008)

      Fig.  5.  Rock classification TAS SiO2-K2O+Na2O diagrams (a) and Zr-Y diagram of the Lundu mafic rocks, Kuching (b)

      图  6  伦杜基性岩的球粒陨石标准化稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b)

      用于标准化的球粒陨石和原始地幔数据分别引自Taylor and McLennan(1995)Sun and McDonough(1989)

      Fig.  6.  Chondrite-normalized REE pattern (a) and PM-normalized incompatible element spiderdiagram (b) for the Lundu mafic rocks, Kuching

      图  7  伦杜基性岩(87Sr/86Sr)-εNd(t)关系图(改自张云等,2019)

      Fig.  7.  (87Sr/86Sr)iNd(t) diagram of the Lundu mafic rocks(modified from Zhang et al., 2019)

      图  8  古晋伦杜地区基性岩的(Ta/La)N-(Hf/Sm)N(a)和U/Th-Th判别图解(b)

      Fig.  8.  Plots of (Ta/La)N-(Hf/Sm)N (a) and U/Th-Th (b) from Lundu mafic samples, Kuching

      图  9  (a) 沙捞越伦杜基性岩Ti-Zr判别图解、(b)Zr/Y-Y判别图解、(c)Th/Zr-Nb/Zr和(d)V-Ti/1 000判别图解

      数据来源同图 3

      Fig.  9.  Ti-Zr (a), Zr/Y-Y (b), Th/Zr-Nb/Zr (c), V-Ti/1 000 (d) for the Lundu mafic rocks, Kuching

      图  10  研究区及邻近区域晚白垩世岩浆岩出露分布

      Fig.  10.  Simplified map showing the distribution of Late Cretaceous magmatism rock locations in the study area and adjacent areas

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