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

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¹,
郑有业^{1, 2, ,},
冯庆来²,
陕亮³,
魏俊浩¹,
张翔⁴,
张刚阳¹,
马国桃⁵,
庞迎春¹

1.
中国地质大学资源学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
3.
中国地调局发展研究中心, 北京 100037
4.
甘肃地勘局第二地质勘查院, 甘肃兰州 730045
5.
成都地质矿产研究所, 四川成都 610082

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
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出版历程
- 收稿日期: 2009-06-16
- 刊出日期: 2009-11-25

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

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Development and Research Center of China Geological Survey, Beijing 100037, China
4.
Second Geological and Mineral Exploration Institute of Gansu Province, Lanzhou 730045, China
5.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China

摘要

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, La_N/Ce_N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.regulare、Alievium cf.fatuum、Archaeospongoprunum cf.patricki、Archaeodictyimitra mitra Dumitrica等早白垩世分子, 其提供了岛弧活动时间上限的约束.
- 白垩纪 /
- 放射虫 /
- 硅质岩 /
- 岩石学 /
- 岛弧 /
- 夏浦沟 /
- 雅鲁藏布江缝合带
Abstract: The stratigraphic units composed of radiolarian chert and lava were found in Xiapugou in western of Yarlung Zangbo Suture Zone during the 1/250000 field geology survey. The radiolarian cherts are characterized by SiO₂ ranging from 89.47 to 92.94%, Si/ Al ratio ranging from 43 to 67, Al/ (Al+Fe+Mn) ratio from 0.68 to 0.74, The average MnO/TiO₂, Ce/Ce^* and LaN/CeN ratio is 0.60, 0.89 and 1.09, which indicates the radiolarian chert was formed in transitional environment between continental margin basin and the oceanic basin, and had much more close relationship with the former one. The lava mainly belongs to andesite and is characterized by (1) low TiO₂ varying from 0.75 to 0.98%; (2) gentle enrichment in LREE; (3) fluid-soluble elements, such as Ba, U and Pb, are extremely enriched compared with LREE; (4) depleted in high-field strength elements (HFSE) such as Nb, Ta, Ti). All these characters imply that the stratigraphic units are consistent with a juvenile intra-oceanic arc, which maybe represents the remains of New-Tethys intra-oceanic subduction system. The early Cretaceous fauna of radiolarian fossils from the chert including Alievium cf. regulare, Alievium cf. fatuum, Archaeospongoprunum cf. patricki, Archaeodictyimitra mitra Dumitrica et al. have been identified, yielding a upper time restrain of this juvenile intra-oceanic arc.
- Cretaceous /
- radiolarian /
- chert /
- lithology /
- island arc /
- Xiapugou /
- Yarlung Zangbo Suture Zone

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图 1 西藏阿里夏浦沟一带地质草图

Q^pal.第四系冲洪积; N₂Q₁Z.札达群; E_1-2L.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; K₂hγδ.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

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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; E₁hγδ.古新世巨斑状花岗闪长岩; F_2-1、F_2-2.达机翁-彭错林-朗县断裂

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

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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.

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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.La_N/Ce_N-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

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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

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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

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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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