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    西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩: 新特提斯洋内俯冲体系的记录?

    许荣科 郑有业 冯庆来 陕亮 魏俊浩 张翔 张刚阳 马国桃 庞迎春

    许荣科, 郑有业, 冯庆来, 陕亮, 魏俊浩, 张翔, 张刚阳, 马国桃, 庞迎春, 2009. 西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩: 新特提斯洋内俯冲体系的记录?. 地球科学, 34(6): 884-894.
    引用本文: 许荣科, 郑有业, 冯庆来, 陕亮, 魏俊浩, 张翔, 张刚阳, 马国桃, 庞迎春, 2009. 西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩: 新特提斯洋内俯冲体系的记录?. 地球科学, 34(6): 884-894.
    XU Rong-ke, ZHENG You-ye, FENG Qing-lai, SHAN Liang, WEI Jun-hao, ZHANG Xiang, ZHANG Gang-yang, MA Guo-tao, PANG Ying-chun, 2009. Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet: Records of Neo-Tethys Intra-Oceanic Subduction System?. Earth Science, 34(6): 884-894.
    Citation: XU Rong-ke, ZHENG You-ye, FENG Qing-lai, SHAN Liang, WEI Jun-hao, ZHANG Xiang, ZHANG Gang-yang, MA Guo-tao, PANG Ying-chun, 2009. Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet: Records of Neo-Tethys Intra-Oceanic Subduction System?. Earth Science, 34(6): 884-894.

    西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩: 新特提斯洋内俯冲体系的记录?

    基金项目: 

    国家科技支撑计划 2006BAB01A04

    国家重点基础研究发展计划 2002CB412610

    教育部重大项目 308018

    中国地调局国土资源大调查项目 200210200001

    中国地调局国土资源大调查项目 1212010531504

    详细信息
      作者简介:

      许荣科(1968-), 男, 在读博士生, 高级工程师, 主要从事基础地质及矿床学研究

      通讯作者:

      郑有业, E-mail: zhyouye@163.com

    • 中图分类号: P539.5;P588.2

    Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet: Records of Neo-Tethys Intra-Oceanic Subduction System?

    • 摘要: 在西藏阿里地区夏浦沟野外调查发现放射虫硅质岩、熔岩组合.放射虫硅质岩SiO2含量在89.47%~92.94%之间, Si/Al在43~67之间, Al/ (Al+Fe+Mn) 比值在0.68~0.74之间, MnO/TiO2平均比值为0.60, Ce/Ce*平均值为0.89, LaN/CeN平均值1.09, 指示它位于洋盆和大陆边缘过渡的环境, 总体更接近大陆边缘环境.伴生的火山熔岩以安山质为主, 具低TiO2 (0.75%~0.98%)、轻稀土弱富集和源自板片流体的易溶元素如Ba、U、Pb相对轻稀土富集, 亏损高场强元素(HFSE) Nb、Ta、Ti等, 指示形成于岛弧环境, 很可能是中生代新特提斯洋洋内俯冲系统的组分.放射虫动物群主要包括Alievium cf.regulareAlievium cf.fatuumArchaeospongoprunum cf.patrickiArchaeodictyimitra mitra Dumitrica等早白垩世分子, 其提供了岛弧活动时间上限的约束.

       

    • 图  1  西藏阿里夏浦沟一带地质草图

      Qpal.第四系冲洪积; N2Q1Z.札达群; E1-2L.柳区群; TQ.穷果群; Cy-PS.亚里组-色龙群; PtN.元古界聂拉木岩群; PtNq.元古界念青唐古拉岩群; K2δ.古新世巨斑状花岗闪长岩; arc.中酸性火山熔岩及碎屑岩; Σ.变质超基性岩; β.玄武岩; gh.榴闪岩; Ⅰ.羌塘地块; Ⅱ.班公湖-怒江缝合带; Ⅲ.拉萨地块(Ⅲ1.班戈岩浆岩带; Ⅲ2.狮泉河缝合带; Ⅲ3.冈底斯火山岩浆弧; Ⅲ4.冈底斯南缘弧前沉积带); Ⅳ.印度河-雅鲁藏布江缝合带(Ⅳ1.北支蛇绿岩; Ⅳ2.扎达微陆块; Ⅳ3.南支蛇绿岩); Ⅴ.印度陆块; F1.札达-拉孜-邛多江断裂; F2.达机翁-彭错林-朗县断裂; F3.噶尔藏布右型走滑断裂(地质草图资料据实测, 印控区据遥感解译; 构造位置据Pan et al. (2004)许荣科等(2005)并简化和修正)

      Fig.  1.  Geological sketch map of Xiapugou area in Ngri, Tibet

      图  2  西藏曲松夏浦沟剖面

      1.灰白色硅质岩; 2.紫红色放射虫硅质岩; 3.安山质火山角砾岩; 4.玄武安山岩; 5.断层或韧性剪切带; 6.片麻理; E1δ.古新世巨斑状花岗闪长岩; F2-1、F2-2.达机翁-彭错林-朗县断裂

      Fig.  2.  The section of Xiapugou in Qusong, Tibet

      图  3  雅鲁藏布江缝合带早白垩世放射虫化石(采自札达县夏浦沟, 图中标尺50 μm)

      Fig.  3.  Early Cretaceous radiolarian fossils in the Yarlung Zangbo Suture Zone

      1、2.Archaeodictyimitra mitra Dumitrica; 3、4、5.Pseudodictyomitra sp.; 6.Archaeocenosphaera sp.; 7.Alievium cf. regulare (Wu and Li); 8、9.Archaeospongoprunum cf. patricki Jud.; 10.Paronaella sp.; 11.Halesium sp.; 12.Praeconosphaera sp.; 13.Rikivatella? sp.; 14.Gen. et sp. indeter.

      图  4  硅质岩成因及形成环境判别

      a.Al-Fe-Mn图解, A.生物成因硅质岩区; B.热液成因硅质岩区; b.稀土配分图解; c.LaN/CeN-Al2O3/ (Al2O3+Fe2O3) 图解; a原图据Adachi et al. (1986) and Yamamoto (1987), c原图和北美页岩数据据Gromet et al. (1984)

      Fig.  4.  The distinguish about chert genesis and environment

      图  5  SiO2-Zr/TiO2*0.000 1图解

      原图据Winchester and Floyd (1977)

      Fig.  5.  SiO2 Versus Zr/TiO2*0.000 1 classification diagram for volcanic rocks

      图  6  稀土及微量元素原始地幔标准化曲线

      原始地幔据Mcdonough and Sun (1995)

      Fig.  6.  REE and trace element pattern, normalized to primary mantle values

      表  1  硅质岩及安山岩的主量元素(%)、微量元素(10-6) 组成

      Table  1.   Major element (%), trace elements (10-6) composition of selected siliceous and andesitic samples

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    • 收稿日期:  2009-06-16
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