东昆仑巴颜喀拉浊积盆地二叠纪火山岩

朱云海; PanYuan-ming; 王国灿; 林启祥; 贾春兴

东昆仑巴颜喀拉浊积盆地二叠纪火山岩

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
萨斯卡切温大学地质系, 萨斯喀通, S7N5E2, 加拿大
3.
青海省地调院, 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学位论文专项资金项目“造山带混杂岩区非史密斯地层研究———以青海东昆仑和拉脊山混杂岩带为例” 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及教学工作

中图分类号: P58
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出版历程
- 收稿日期: 2004-08-28
- 刊出日期: 2004-11-25

Permian Volcanic Rocks in the Bayan Hala Turbidite Basin, East Kunlun Area

1.
Faculty ofEarth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Department of Geological Sciences, University of Saskatchewan, Saskatoon SK S7N5E2, Canada
3.
Regional Geological Survey Academy of Qinghai, Xining 810012, China

摘要

摘要: 东昆仑巴颜喀拉浊积盆地内沿扎拉依-哥琼尼洼断裂带及约古宗列断裂带的断夹块内出露有一套二叠纪马尔争组火山岩, 火山岩呈构造岩片形式产出, 扎拉依-哥琼尼洼断裂带火山岩岩石组合主要为玄武岩、玄武安山岩, 少量玄武岩具枕状构造, 岩石SiO₂含量均匀, TiO₂的含量较高, ALK的含量较低, 为拉斑系列的玄武岩, 玄武岩稀土总量较高, 稀土配分曲线为轻稀土富集型, 与洋岛型火山岩的稀土配分曲线相一致, 火山岩大离子亲石元素较富集, 高场强元素及重稀土元素较平坦, 稀土、微量元素特征及构造环境判别显示其形成于较富集的洋岛环境, 少数为洋中脊的构造环境.约古宗列断裂带火山岩岩石组合为玄武岩、玄武安山岩, 岩石SiO₂含量较高, TiO₂含量较低, 均 < 1%, 为钙碱性系列火山岩, 玄武安山岩的稀土配分曲线与扎拉依-哥琼尼洼断裂带一致, 而英安岩的轻稀土富集程度高, 与岛弧高钾安山岩的稀土配分曲线相吻合, 构造环境判别显示其形成于岛弧构造环境.根据扎拉依-哥琼尼洼断裂带两侧火山岩成分的差异以及断裂带两侧巴颜喀拉群碎屑物成分的差异, 可以把巴颜喀拉山三叠纪浊积盆地进一步划分为北亚带和南亚带.
- 东昆仑 /
- 巴颜喀拉 /
- 火山岩 /
- 二叠纪
Abstract: Permian volcanic rocks are developed in fault nip blocks of the Zanayi-Geqiongniwa and Yueguzonglie fault zones in the Bayan Hala turbidite basin, east Kunlun area. Volcanic rocks are output in tectonic slices. The volcanic rock assemblage in the Zanayi-Geqiongniwa fault zone is mainly basalts and basaltic andesites, some with the pillow structure. The SiO₂ content of the volcanic rocks is uniform, the TiO₂ content is higher and the ALK content is lower. The rock type is mainly tholeiitic basalt. REE distribution patterns of which are LREE-rich type and consistent with those of ocean island type volcanic rocks, the large ion lithophile elements of volcanic rocks is more enrichment, HFS elements and HREE of them is flatten. The characteristics of REE, trace elements and tectonic setting distinguishing reveal that the volcanic rocks of the Zanayi-Geqiongniwa fault belt were formed mainly in an ocean island tectonic setting, while some were formed in a middle ocean ridge tectonic setting. The volcanic rock assemblage in the Yueguzonglie fault zone consists of basalt and basaltic andesite. Their SiO₂ content is higher, while TiO₂ content is less than one percent. The rock types are calc-alkaline series. REE distribution patterns of basaltic andesite are consistent with that of the volcanic rocks in the Zanayi-Geqiongniwa fault zones, that of dacite is high rich in LREE and consistent with island arc high-K andesite. Tectonic setting distinguishing reveals that the volcanic rocks of the Yueguzonglie fault belt are formed in island arc tectonic setting. According to the differing contents of the volcanic rocks and clast from the Bayan Hala Group beside the Zanayi-Geqiongniwa fault belt, we can divide the Bayan Hala turbidite basin into north subbelt and south subbelt.
- East Kunlun /
- Bayan Hala /
- volcanic rock /
- Permian

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图 1 巴颜喀拉地区构造单元

1.第四系; 2.三叠纪巴颜喀拉山群; 3.二叠纪马尔争组; 4.印支—燕山期二长花岗岩; 5.印支—燕山期花岗闪长岩; 6.断层; 7.活断层; 8.超镁铁质岩; 9.逆断层

Fig. 1. Tectonic unit of Bayan Hala area

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图 2 扎拉依-哥琼尼洼构造带在贡恰陇巴处的构造地层剖面

Fig. 2. Tectonic strata section of Zalayi-Geqiongniwa tectonic belt in Gongchalongba

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图 3 扎拉依-哥琼尼洼构造带在哥琼尼洼处的构造地层剖面

Fig. 3. Tectonic strata section of Zalayi-Geqiongniwa tectonic belt in Geqiongniwa

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图 4 巴颜喀拉地区二叠纪火山岩TAS图(Le Bas, 1986; IUGS, 1989)

图中碱性亚碱性界线据Irvine and Baragar, 1971; B.玄武岩; O₁.玄武安山岩; O₂.安山岩; O₃.英安岩

Fig. 4. TAS nomination diagram of Permian volcanic rocks in Bayan Hala area

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图 5 巴颜喀拉地区二叠纪火山岩AFM图(Irvine and Barager, 1971)

T.拉斑玄武岩系列; C.钙碱性系列

Fig. 5. AFM diagram of Permian volcanic rocks in Bayan Hala area

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图 6 巴颜喀拉地区二叠纪火山岩稀土配分曲线

Fig. 6. REE distribution patterns of Permian volcanic rocks in Bayan Hala area

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图 7 巴颜喀拉地区二叠纪火山岩微量元素比值蛛网图

Fig. 7. Spider diagram of trace elements of Permian volcanic rocks in Bayan Hala area

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图 8 巴颜喀拉地区二叠纪火山岩w (∑FeO) /w (∑FeO+MgO) -w (TiO₂) 图(据Serri et al., 1985)

HT.高钛玄武岩; LT.低钛玄武岩

Fig. 8. w (∑FeO) /w (∑FeO+MgO) -w (TiO₂) diagram of Permian volcanic rocks in Bayan Hala area

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图 9 巴颜喀拉地区二叠纪火山岩w (K₂O) -w (TiO₂) -w (P₂O₅) 图(Pearce, 1975)

OT.大洋拉斑玄武岩; CT.大陆拉斑玄武岩

Fig. 9. w (K₂O) -w (TiO₂) -w (P₂O₅) diagram of Permian volcanic rocks in Bayan Hala area

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图 10 巴颜喀拉地区二叠纪火山岩w (TiO₂) -w (FeO^*) /w (MgO) 图(Miyashiro, 1975)

OIB.洋岛玄武岩; MORB.洋中脊玄武岩; IAT.岛弧拉斑玄武岩; CA.钙碱性玄武岩; T.拉斑玄武岩

Fig. 10. w (TiO₂) -w (FeO^*) /w (MgO) diagram of Permian volcanic rocks in Bayan Hala area

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图 11 巴颜喀拉地区二叠纪火山岩w (Y/15) -w (La/10) -w (Nb/8) 图(Cabanis and Lecolle, 1989)

1.火山弧; 1A.钙碱性玄武岩; 3.大洋玄武岩; 3A.陆间裂谷碱性玄武岩; 3B.E-型MORB; 其他区略

Fig. 11. w (Y/15) -w (La/10) -w (Nb/8) diagram of Permian volcanic rocks in Bayan Hala area

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表 1 巴颜喀拉地区二叠纪火山岩化学分析结果

Table 1. Chemical analysis results of Permian volcanic rocks in Bayan Hala area

表 2 巴颜喀拉地区二叠纪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 standardise of Permian volcanic rocks in Bayan Hala area

表 3 巴颜喀拉地区二叠纪马尔争组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 standardise of Permian volcanic rocks in Bayan Hala area

参考文献(14)

[1]	Bruguier, O., Lancelot, J.R., Malavieille, J., 1997. U-Pb dating on single detrital zircon grains from the Triassic SongpanGanze flysch(central China); provenance and tectonic correlations. Earth and Planetary Science Letters, 152: 1-4, 217-231. doi: 10.1016/S0012-821X(97)00152-0
[2]	Cabanis, B., Lecolle, M., 1989. Le diagramme La/10-Y/15Nb/8: Un outil pour la discrimination des series volcaniques el la mise en evidence des processus de melange et/ou de contamination crustale. C.R. Acad. Sci. (Ser. Ⅱ), 309: 2023-2029.
[3]	Gu, X., 1994. Geochemical characteristics of the Triassic Tethys-turbidites in the northwestern Sichuan, China: Implications for provenance and interpretation of the tectonic setting. Geochim. Cosmochim. Acta, 58: 4615-4631. doi: 10.1016/0016-7037(94)90195-3
[4]	Irvine, T.N., Barager, W.R.A., 1971. A guide to the chemical classification of the common volcanic rocks. Can. J. Earth Sci. , 523-548.
[5]	Jiang, X.S., Pan, G.T., Yan, Y.J., et al., 1996. Triassic sedimentary framework and tecto-paleogeographic evolution of the juncture of the Qinling, Qilian and Kunlun orogenic belts. Acta Geologica Sichuan, 16(3): 204-208(in Chinese with English abstract).
[6]	Le Bas, M.J., 1986. A chemical classification of volcanic rocks based on the total alkali-silica diagram. J. Petrol. , 27: 745-750. doi: 10.1093/petrology/27.3.745
[7]	Miyashiro, A., 1975. Classification, characteristics and origin of ophiolites. J. Geol. , 83: 249-281. doi: 10.1086/628085
[8]	Pearce, J.A., 1983. Role of the sub-continental lithosphere in magma genesis at active continental margins. In: Hawkesworth, C. J., Norry, M. J., eds., Continental basalts and mantle xenoliths. Shiva, Nantwich, 230-249.
[9]	Pearce, T.H., 1975. The TiO₂-K₂O-P₂O₅ diagram: A method of discriminating between oceanic and nonoceanic basalts. Earth Planet. Sci. Lett. , 24: 419-426. doi: 10.1016/0012-821X(75)90149-1
[10]	Serri, G., Hebert, R., Hekinian, R., 1985. Chemistry of ultramafic tectonites and ultramafic to gabbroic cumulates from the major oceanic basins and the northern Apennines ophiolites. Ofioliti. , 10: 63-76.
[11]	Taylor, S.R., McLennan, S.M., 1985. The continental crust: Its composition and evolution. Blackwell, Oxford.
[12]	Zhang, Y.F., 1995. Some opinions about the Triassic stratigraphy in the Bayan Hala area. Regional Geology of China, 1: 21-31(in Chinese with English abstract).
[13]	江新胜, 潘桂棠, 颜仰基, 等, 1996. 秦、祁、昆交接区三叠纪沉积相格架及构造古地理演化. 四川地质学报, 16(3): 204-208. https://www.cnki.com.cn/Article/CJFDTOTAL-SCDB603.002.htm
[14]	张以茀, 1995. 对巴颜喀拉区三叠纪地层系统的认识. 中国区域地质, 1: 21-31. https://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD501.003.htm