东昆仑造山带诺木洪郭勒早古生代火山活动

朱云海; 王国灿; 贾春兴; 林启祥; 王青海

东昆仑造山带诺木洪郭勒早古生代火山活动

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研究与教学工作

中图分类号: P588.1
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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: 诺木洪郭勒一带发育早古生代火山岩, 可明显分为2种类型: 一类为基性火山岩组合, 岩石主要为具枕状构造的玄武岩, SiO₂碱度均较低, 为拉斑系列玄武岩, 稀土、微量元素特征及构造环境判别显示其形成于洋中脊的构造环境; 另一类为中基性火山岩组合, 火山岩岩石类型复杂, 熔岩和火山碎屑岩均较发育, 熔岩成分从基性到中酸性均有, 火山岩SiO₂成分变化较大, 既有亚碱性, 又有碱性, 亚碱性系列岩石多属钙碱性系列.稀土、微量元素特征及构造环境判别其形成于火山弧的环境.
- 东昆仑造山带 /
- 早古生代 /
- 火山岩 /
- 诺木洪郭勒
Abstract: Early Paleozoic volcanic rocks developed in Nuomuhong area can be devided into two types. One is the basic volcanic assemble, mainly consisting of tholeiite basalts with low SiO₂ and alkali. Its characteristics of REE, trace elements and tectonic setting reveal that it formed in middle ocean ridge tectonic setting. The other is called middle-basic volcanic assemble with complex rock types and well developed lava and pyroclastics. The volcanic rocks belong to subalkali and alkali series, and the subalkali rocks belong to calalkali series. The charecteristics of REE, trace elements and tectonic setting indicate that they formed in volcanic arc tectonic setting.
- East Kunlun orogenic belt /
- Early Paleozoic /
- volcanic rock /
- Nuomuhongguole area

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图 1 诺木洪地区地质简图

1.第四纪冲洪积物; 2.早侏罗世羊曲组; 3.晚三叠世八宝山组; 4.早中三叠世洪水川组; 5.早石炭世哈拉郭勒组; 6~9.早古生代纳赤台群; 6.基性火山岩组合; 7.中基性火山岩组合; 8.碎屑岩组合; 9.碳酸岩组合; 10.狼牙山组; 11.苦海岩群; 12.中三叠世二长花岗岩; 13.中三叠世花岗闪长岩; 14.中三叠世浆混花岗岩; 15.中石炭世二长花岗岩; 16.早石炭世钾长花岗岩; 17.早泥盆世二长花岗岩; 18.中志留世辉石闪长岩; 19.玄武岩; 20.中基性火山岩; 21.强片理化中基性火山岩; 22.强片理化火山碎屑岩; 23.大理岩; 24.强片理化碎屑岩; 25.变硅质岩糜棱岩; 26.眼球状片麻岩; 27.糜棱岩; 28.超镁铁质岩; 29.逆断层; 30.斜冲断层; 31.正断层

Fig. 1. Sketch geological map of Nuomuhong area

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图 2 早古生代基性火山岩组合实测剖面

1.复成分砾岩; 2.枕状玄武岩; 3.二长花岗岩; 4.英安斑岩; 5.花斑岩; 6.玄武质构造角砾岩; 7.粗安岩; 8.断层及运动方向; 9.玻基玄武岩; 10.玄武岩; 11.条带状亮晶灰岩; 12.砾屑灰岩; 13.泥质灰岩; 14.大理岩; 15.玻屑凝灰岩; 16.晶屑凝灰岩; 17.硅质岩

Fig. 2. Section of basalt slice of Early Paleozoic

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图 3 早古生代中基性火山岩组合实测剖面

1.砂岩; 2.石英砂岩; 3.长石砂岩; 4.泥质粉砂岩; 5.泥质岩; 6.灰岩; 7.结晶灰岩; 8.硅质岩; 9.斜长角闪岩; 10.辉绿岩; 11.闪长岩; 12.石英闪长岩; 13.辉石闪长岩; 14.玄武岩; 15.杏仁状玄武岩; 16.安山岩17.玻基安山岩; 18.石英安山岩; 19.英安岩; 20.流纹斑岩; 21.英安流纹斑岩; 22.凝灰岩; 23.晶屑凝灰岩; 24.玻屑凝灰岩; 25.玄武质凝灰岩; 26.含火山角砾晶屑凝灰岩; 27.安山质凝灰角砾岩; 28.安山质火山角砾岩; 29.板岩; 30.斑点状板岩; 31.粉砂质板岩; 32.硅质板岩; 33.凝灰质板岩; 34.大理岩; 35.石英片岩; 36.绿泥绿帘片岩; 37.片理化; 38.断层角砾岩及碎裂岩化; 39.断层; 40.产状

Fig. 3. Section of metavolcanic slice of Early Paleozoic

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图 4 玄武岩岩枕裂隙素描

Fig. 4. Sketch map of fracture of pillow basalts

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图 5 早古生代火山岩TAS图^[4]

B.玄武岩; O₁.玄武安山岩; O₂.安山岩; O₃.英安岩; R.流纹岩; S₁.粗面玄武岩; S₂.玄武质粗面安山岩; S₃.粗面安山岩; 其他符号略(图中碱性亚碱性界线据Irvine和Barager^[5]); ▲基性火山岩组合(斜线区); ●中基性火山岩组合(竖线区)

Fig. 5. TAS diagram of Early Paleozoic volcanic rocks

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图 6 早古生代火山岩AFM图^[5]

T.拉斑玄武岩系列; C.钙碱性系列; ▲基性火山岩组合; ●中基性火山岩组合

Fig. 6. AFM diagram of Early Paleozoic volcanic rocks

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图 7 早古生代火山岩稀土配分曲线

●基性火山岩组合(阴影区); ▲中基性火山岩组合(竖线区)

Fig. 7. REE distribution patterns of Early Paleozoic volcanic rocks

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图 8 早古生代火山岩微量元素比值蛛网图

a.基性火山岩组合; b.中基性火山岩组合

Fig. 8. Spider diagram of trace elements of Early Paleozoic volcanic rocks

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图 9 早古生代火山岩w (K₂O) -w (TiO₂) -w (P₂O₅) 图

OT.大洋拉斑玄武岩; CT.大陆拉斑玄武岩; 基性火山岩组合: ●玄武岩; 中基性火山岩组合: ▲玄武岩; ■玄武质粗面安山岩

Fig. 9. Diagram of w (K₂O) -w (TiO₂) -w (P₂O₅) of Early Paleozoic volcanic rocks

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图 10 早古生代火山岩w (Y/15) -w (La/10) -w (Nb/8) 图

1.火山弧: 1A.钙碱性玄武岩; 1B.地渡区; 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-MORB型(B富集, C略富集); 3D.N-MORB型; 基性火山岩组合: ●玄武岩; 中基性火山岩组合: ▲玄武岩; ■玄武质粗面安山岩

Fig. 10. Diagram of w (Y/15) -w (La/10) -w (Nb/8) of Early Paleozoic volcanic rocks

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表 1 早古生代纳赤台混杂岩群火山岩化学分析结果

Table 1. Chemical analysis results of Early Paleozoic volcanic rocks

表 2 早古生代纳赤台混杂岩群火山岩稀土元素分析结果及球粒陨石标准化值

Table 2. Analysis results of REE and meteorite standardized values of Early Paleozoic volcanic rocks

表 3 早古生代火山岩微量元素分析结果及MORB标准化值

Table 3. Analysis results of trace elements and MORB standardized values of Early Paleozoic volcanic rocks

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