东昆仑造山带海德乌拉一带早侏罗世火山岩特征及其构造意义

朱云海; 朱耀生; 林启祥; 王国灿

东昆仑造山带海德乌拉一带早侏罗世火山岩特征及其构造意义

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
青海省地质调查研究院, 青海西宁 810012

基金项目:

中国地质调查局1∶25万阿拉克湖幅区域地质调查项目 19991300004021

高等学校全国优秀博士论文作者专项资金项目 200228

详细信息

作者简介:
朱云海(1964 -), 男, 副教授, 1985年毕业于武汉地质学院, 主要从事造山带蛇绿岩、岩浆岩及造山带填图方法的研究及教学工作

中图分类号: P58
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出版历程
- 收稿日期: 2003-05-15
- 刊出日期: 2003-11-25

Early Paleozoic Volcanism in Nuomuhongguole Area, East Kunlun Orogenic Belt

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Institute of Qinghai Geological Survey, Xining 810012, China

摘要

摘要: 对东昆仑造山带哈拉郭勒地区海德乌拉山一带的火山岩进行了较系统的岩石学、地球化学研究.在实测剖面研究、同位素年代学及区域地层对比的基础上, 把该套火山岩厘定为早侏罗世火山岩.火山岩岩石组合主要为基性和酸性熔岩, 成分上具典型的裂谷"双峰式"特征, 缺乏中性岩石, 基性火山岩碱性程度较高, 酸性火山岩主要为钙碱性岩石, 其形成的构造环境为俯冲过程中在岛弧靠近大陆一侧弧后拉张形成的陆内裂谷的构造环境.
- 东昆仑造山带 /
- 早侏罗世 /
- 裂谷 /
- 火山岩
Abstract: This article studies systematically the petrology and geochemistry of the volcanic rocks of Haidewula area, east Kunlun orogenic belt, Qinghai Province. Based on the section, isotopic dating and regional strata contrasting, it has determined that this suit of volcanic rocks should be Early Jurassic. These volcanic rocks are mainly basic and acid, showing typical "Bi-model" character of rifting, but lacking in intermediate rocks. The basic rocks have a higher alkali degree, while the acid rocks mainly belong to calc series. The volcanic rocks are formed in the rift tectonic environment, split from inner continent among the post orogeny.
- east Kunlun orogenic belt /
- Early Jurassic /
- rift /
- volcanic rock

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图 1 早侏罗世火山岩分布

Qp₃^pal.晚更新世洪冲积; Qp₁^l-al.早更新世河潮积; Ent.古近纪沱沱河组; J₁y.早侏罗世羊曲组; J₁.早侏罗世火山岩; T₃b.晚三叠世八宝山组; T₁H.早三叠世洪水川群; CPh.晚石炭世—早二叠世浩特洛哇组; d (Pz₁N).早古生代纳赤台群变碎屑岩岩片; Pt₂l.中元古代狼牙山组; Pt₁B.古元古代白沙河岩群; 1.早三叠世二长花岗岩; 2.早三叠世钾长花岗岩; 3.晚石炭世二长花岗岩; 4.晚石炭世花岗岩; 5.晚奥陶世石英闪长岩; 6.断层; 7.地质界线; 8.实测剖面线及剖面号

Fig. 1. Sketch distribution map of Early Jurassic volcanic rocks

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图 2 海德乌拉山北侧早侏罗世火山岩实测剖面(AP51)

1.砾岩; 2.复成分砾岩; 3.砂岩; 4.石英砂岩; 5.长石砂岩; 6.长石石英砂岩; 7.铁质粉砂岩; 8.粉砂岩; 9.灰岩; 10.石英闪长岩; 11.石英闪长玢岩; 12.花岗闪长岩; 13.玄武岩; 14.杏仁状玄武岩; 15.英安岩; 16.含角砾晶屑凝灰岩; 17.玄武质凝灰岩; 18.断层

Fig. 2. Section of Early Jurassic volcanic rocks in north of Haidewula Mountain

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图 3 海德乌拉山南侧早侏罗世火山岩实测剖面(AP50)

1.砾岩; 2.含砾砂岩; 3.砂岩; 4.长石砂岩; 5.粉砂岩; 6.石英闪长岩; 7.玄武岩; 8.杏仁状玄武岩; 9.安山岩; 10.石英安山岩; 11.杏仁状安山岩; 12.粗面岩; 13.流纹岩; 14.豆状流纹岩; 15.安山质火山角砾岩; 16.安山质凝灰岩; 17.晶玻屑凝灰岩; 18.玻屑凝灰岩

Fig. 3. Section of Early Jurassic volcanic rocks in south of Haidewula Mountain

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图 4 早侏罗世火山岩TAS图^[7]

B.玄武岩; O3.英安岩; R.流纹岩; S1.粗面玄武岩; S2.玄武质粗面安山岩; T.粗面岩, 其他符号略

Fig. 4. TAS diagram of Early Jurassic volcanic rocks^[7]

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图 5 早侏罗世火山岩AMF图^[8]

T.拉斑玄武岩系列; C.钙碱性系列

Fig. 5. AFM diagram of Early Jurassic volcanic rocks^[8]

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图 6 早侏罗世火山岩稀土配分曲线

Fig. 6. REE distribution patterns of Early Jurassic volcanic rocks

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图 7 早侏罗世火山岩微量元素比值蛛网图

Fig. 7. Normalized-MORB trace elements spider diagram of Early Jurassic volcanic rocks

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图 8 早侏罗世玄武岩w (Y) /15-w (La) /10-w (Nb) /8关系^[13]

1.火山弧; 1A.钙碱性玄武岩; 1B.过渡区; 1C.火山弧拉斑玄武岩; 2.大陆玄武岩; 2A.大陆玄武岩; 2B.弧后盆地玄武岩; 3.大洋玄武岩; 3A.陆内裂谷碱性玄武岩; 3B, 3C.E-型MORB (B富集, C略富集); 3D.N-型MORB

Fig. 8. Diagram of w (Y) /15-w (La) /10-w (Nb) /8 of Early Jurassic basalts^[13]

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图 9 早侏罗世玄武岩w (Ti) /100-w (Zr) -3w (Y) 图^[14]

A.IAT; B.MORB+CA; C.CA; D.WPB; IAT.岛弧拉斑玄武岩; MORB.洋中脊玄武岩; CA.钙碱性玄武岩; WPB.板内玄武岩

Fig. 9. Diagram of w (Ti) /100-w (Zr) -3w (Y) of Early Jurassic basalts^[14]

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图 10 早侏罗世玄武岩2w (Nb) -w (Zr) /4-w (Y) 图^[15]

AⅠ.板内碱性玄武岩; AⅡ.板内碱性+板内拉斑玄武岩; B.E-型MORB; C.板内拉斑+火山弧; D.N-型MORB+火山弧玄武岩

Fig. 10. Diagram of 2w (Nb) -w (Zr) /4-w (Y) of Early Jurassic basalts^[15]

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表 1 早侏罗世火山岩化学分析结果

Table 1. Chemical analysis results of Early Jurassic volcanic rocks

表 2 早侏罗世火山岩稀土元素分析结果

Table 2. Analysis results of REE of Early Jurassic volcanic rocks

表 3 早侏罗世火山岩微量元素分析结果

Table 3. Trace elements analysis results of Early Jurassic volcanic rocks

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