黄陵地区基性岩墙群的地球化学特征及其地质意义

曾雯; 钟增球; 周汉文; 江麟生; 周忠友; 陈铁龙

黄陵地区基性岩墙群的地球化学特征及其地质意义

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
湖北省区域地质调查研究院, 湖北宜昌 443000

基金项目:

国家自然科学基金重点项目 40032010B

详细信息

作者简介:
曾雯(1981-),女,2003级硕士研究生,原地质学理科基地班010991班学生,研究方向为岩石学.E-mail: rodinia@tom.com

中图分类号: P595;P588
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- 被引次数: 0
出版历程
- 收稿日期: 2003-09-09
- 刊出日期: 2004-01-25

Geochemistry of Mafic Dykes in Huangling Area and Its Tectonic Implications

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 443000, China

摘要

摘要: 黄陵地区的基性岩墙群主要由辉绿岩脉和辉绿玢岩脉组成, 走向主要为NEE向, 少量为NNW向.元素地球化学显示其为形成于板内拉张环境下的亚碱性玄武岩特征, 其很低的Mg# 指示为岩浆高度演化的产物, 同时Nb、Ta的亏损和Pb的富集表明其受到地壳物质的混染, 这说明可能是在拉张环境下由先前被俯冲带流体交代的地幔源重熔的结果.根据前人的年代学研究结果, 它形成于770Ma左右, 可能跟Rodinia超级古陆裂解构造背景相关.
- 基性岩墙群 /
- 黄陵花岗岩 /
- 地球化学 /
- Rodinia
Abstract: According to the geological characteristics, the mafic dykes in Huangling area mainly include diabase and diabase-prophyrite, with nearly NEE trend and NNW trend. Geochemical characteristics of the dykes indicate that they are sub-alkaline basalt formed in WPB. The low Mg^#(Mg^#=100×MgO/(MgO+0.9×TFe₂O₃))shows the magma for the dykes was highly evolutionary. The depletion in Nb and Ta, and the enrichment in Pb indicate that the mafic dykes are contaminated by crustal material. All these suggest that it may be the product of remelted materials from mantle source, which had been metasomatismed by the fluid in subduction zone, under the extensional circumstance. Based on the previous geochronological researches, it is concluded that the mafic dyke swarms intruded at about 770 Ma and may be related to the breakup of the Rodinia supercontinent.
- mafic dyke swarm /
- Huangling granite /
- geochemistry /
- Rodinia

HTML全文

图 1 黄陵地区地质略图(马大铨等, 1997)

Ar₃.基底片麻岩; Pt₁.表壳岩; ∑₂.橄榄岩; γ₂.辉长岩; δ₂.闪长岩; γ₂¹.圈椅垧花岗岩; γ₂².黄陵花岗岩; Z+Pz.震旦系及古生界; 1.地质界线; 2.不整合; 3.断层; 4.基性岩墙

Fig. 1. Geological sketch map of Huangling area

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图 2 黄陵地区基性岩墙群的TAS岩石分类图解

R.流纹岩; T.粗面岩; O₁.玄武安山岩; O₂.安山岩; O₃.英安岩; Pc.苦橄玄武岩; S₁.粗面玄武岩; S₂.玄武质安山岩; S₃.粗面安山岩; B.玄武岩; U₁.碱玄岩或碧玄岩; U₂.响岩质玄武岩; U₃.碱玄质响岩; Ph.响岩; F.副长石岩

Fig. 2. TAS diagram for rock classification of mafic dyke swarms in Huangling area

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图 3 黄陵地区基性岩墙群的Harker图解(李昌年, 1992)

Fig. 3. Harker-type oxides vs. MgO for mafic dyke swarms in Huangling area

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图 4 黄陵地区基性岩墙群微量元素与MgO的相关图解

Fig. 4. Selected trace element abundances vs. MgO variation diagram

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图 5 黄陵地区基性岩墙群的球粒陨石标准化稀土分布模式

Fig. 5. Chondrite-normalized REE patterns for mafic dyke swarms in Huangling area

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图 6 黄陵地区基性岩墙群的不相容元素蛛网图

Fig. 6. Primitive mantle-normalized incompatible trace element spidergrams for mafic dyke swarms in Huangling area

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图 7 黄陵地区两类基性岩墙形成的构造环境w(Zr)/w(Y)-w(Zr)相关图(Rollinson, 1993)

WPB.板内玄武岩; MORB.洋中脊玄武岩; IAT.岛弧拉斑玄武岩

Fig. 7. Tectonic environments discriminant w(Zr)/w(Y)-w(Zr)diagram for mafic dykes in Huangling area

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图 8 黄陵地区基性岩墙群的地幔类型判别图(Rollinson, 1993; 邵济安等, 2001)

N.亏损地幔; T.过渡型地幔; P.富集地幔

Fig. 8. Mantle discriminant diagram for mafic dyke swarms in Huangling area

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图 9 黄陵地区基性岩墙群形成的构造环境判别图(Rollinson, 1993)

Fig. 9. Tectonic environments discriminant diagram for mafic dyke swarms in Huangling area

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表 1 黄陵地区基性岩墙群的主量元素组成

Table 1. Major element data for mafic dyke swarms in Huangling area w_B/%

表 2 黄陵地区基性岩墙群的微量元素组成

Table 2. Trace element data for mafic dyke swarms in Huangling area w_B/10^-6

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