保山地块西缘早古生代增生造山作用

毛晓长; 尹福光; 唐渊; 王冬兵; 廖世勇; 熊昌利

doi:10.3799/dqkx.2014.099

保山地块西缘早古生代增生造山作用

doi: 10.3799/dqkx.2014.099

毛晓长^{1, 2,},
尹福光³,
唐渊³,
王冬兵³,
廖世勇³,
熊昌利⁴

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质调查局, 北京 100037
3.
成都地质矿产研究所, 四川成都 610081
4.
四川省地质调查院, 四川成都 610081

基金项目:

中国地质调查项目 1212011220412

中国地质调查项目 12120113049100

中国地质调查项目 12120113050300

详细信息

作者简介:
毛晓长(1979-), 男, 博士研究生, 主要从事区域地质研究及管理.E-mail: xmaoteng@163.com

中图分类号: P542
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出版历程
- 收稿日期: 2014-06-15
- 刊出日期: 2014-08-01

Early Paleozoic Accretionary Orogenesis on Western Margin of Baoshan Block

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
China Geological Survey, Beijing 100037, China
3.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China
4.
Sichuan Institute of Geological Survey, Chengdu 610081, China

摘要

摘要: 在保山地块西缘泸水-潞西构造带内, 出露一套构造混杂岩.主体为强变形的震旦系-古生界蒲满哨群、公养河群浅变质碎屑岩夹碳酸盐岩及火山岩等复理石浊积岩系等构成, 另有硅质岩、杂砂岩、灰岩、砾岩、玄武岩及花岗岩等弱变形的构造块体.岩石时代从震旦纪至古生代, 跨度大, 高度混杂, 并有从东向西变新的逐势, 表现为后退式增生.构造样式早期为同斜倒转冲断作用的叠瓦构造, 后期表现为近N-S向剪切.玄武安山岩、流纹岩类具弧火山岩特征, 而玄武岩类则为板内火山岩, 2种火山岩分别对应岛弧与弧后拉张洋盆产物.寒武纪、奥陶纪侵位的花岗岩也分为东西2个带, 西晚东早, 代表了保山陆块西缘岩浆弧的一部分.这样就记录了洋壳俯冲消亡、增生楔形成过程的沉积、火山-岩浆、变质和构造变形的地质事件群, 也记录了保山地块西缘早古生代增生造山形成过程的地质事件, 并证明了泸水-潞西构造带在震旦纪-古生代存在一洋盆.
- 保山地块 /
- 早古生代 /
- 增生造山作用 /
- 岩石学 /
- 沉积 /
- 构造
Abstract: On the western margin of the Baoshan block, a set of tectonic mélange can be seen along the western Lushui-Luxi tectonic zone. It is characterized by matrices consisting of strongly deformed and low-grade metamorphic clastic rocks bearing graptolite of Sinian-Paleozoic Pumanshao Group and Gongyanghe Group and volcanic flysch turbidite, and structural lens consisting of siliceous, graywacke, part limestone, conglomerate, basalt and granite. The ages of these rocks range from Sinian to Paleozoic and get younger from east to west, which shows the characters of retrogressive accretion. In the early stage, the structural styles are characterized by imbricate structures formed by thrust faults and homoclinal-overturned folds, and nearly N-S-trending shear in the late stage. The characteristics of basalt-andesite and rhylite are of arc volcanic rocks, and the basalt shows characteristics of continental intraplate volcanic rocks. Both of the two types of volcanic rocks maybe account for the tectonic setting of island arc and back-arc extension. Cambrian and Ordovician granite can be divided into the western belt and eastern belt, and the ages of the latter are earlier than that of the former. Those granites are part of magmatic arc of the western margin of the Baoshan block. Therefore, this tectonic mélange records the geological events such as extinction to the subduction of the oceanic crust and magmatic sedimentation-volcanic-magmatic-tectonic events during the formation process of accretionary wedge, and also records the information of the Early Paleozoic accretionary orogenesis on the western margin of the Baoshan block. Meanwhile, it suggests the existence of an ocean basin during Sinian-Paleozoic in the Lushui-Luxi tectonic zone.
- Baoshan block /
- Early Paleozoic /
- accretionary orogenesis /
- petrology /
- sedimentology /
- tectonics

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图 1 保山地块西缘大地构造位置简图

Ⅰ.华南板块；Ⅱ.三江造山系；Ⅱ₁.哀牢山结合带；Ⅱ₂.墨江-绿春陆缘弧；Ⅱ₃.昌都-思茅地块；Ⅱ₄.云县-景谷火山弧；Ⅱ₅.澜沧江结合带；Ⅱ₆.临沧-勐海岩浆弧；Ⅲ.昌宁-孟连结合带；Ⅳ.冈底斯-腾冲陆缘造山系；Ⅳ₁.保山-镇康地块；Ⅳ₂.潞西-三台山结合带；Ⅳ₃.冈底斯-腾冲岩浆弧；Ⅳ₄.腾冲-梁河岩浆弧

Fig. 1. Geological geotectonic map of the western margin of the Baoshan block

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图 2 保山地块西缘地质简图(云南省地质调查院，云南1∶25万腾冲县幅、潞西市幅区域地质调查报告，2008)

1.第四系；2.新近系；3.古近系；4.侏罗系-白垩系；5.三叠系(?)；6.奥陶系-志留系；7.上古生界；8.下古生界；9.蒲满哨群；10.公养河群；11.新元古界；12.古元古界；13.古近纪花岗岩；14.晚白垩世花岗岩；15.早白垩世花岗岩；16.早白垩世花岗闪长岩；17.侏罗纪花岗岩；18.三叠纪花岗岩；19.三叠纪超基性岩；20.奥陶纪花岗岩；21.中元古代花岗岩；22.分区断裂及编号；23.一般断裂及编号；24.糜棱岩带；25.超糜凌岩带；26.背斜轴线；27.向斜轴线；28.角度不整合界线；29.火山喷发不整合界线；30.构造层及岩体界线；31.居民点；32.山峰；33.水系

Fig. 2. Geological map of the western margin of the Baoshan block

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图 3 保山地块西缘火山岩稀土元素配分图(a)和微量元素比值蛛网图(b) (据云南省地质调查院，云南1∶25万腾冲县幅、潞西市幅区域地质调查报告，2008)

Fig. 3. Chondrite-normalized REE patterens diagrams (a) and primitive mantle-normalized trace elements spider diagrams (b) of the volcanic rocks in western Baoshan block

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图 4 泸水-潞西火山岩带Ti-Zr图解(a)和Ti/100-Zr-3Y图解(云南省地质调查院，云南1∶25万腾冲县幅、潞西市幅区域地质调查报告，2008)

Fig. 4. Discrimination Ti-Zr diagrams (a) and discrimination Ti/100-Zr-3Y diagrams (b) of tectonic environment of Lushui-Nujiang volcanic zone

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图 5 保山地块西缘奥陶纪花岗岩的稀土元素配分图(a)和微量元素比值蛛网图(b) (云南省地质调查院，云南1∶25万腾冲县幅、潞西市幅区域地质调查报告，2008)

Fig. 5. Chondrite-normalized REE patterens diagrams (a) and primitive mantle-normalized trace elements spider diagrams (b) of the Ordovician granite in western Baoshan block

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图 6 保山地块西缘奥陶纪花岗岩的R₁-R₂图解(a)和Rb/30-Hf-3Ta图解(b) (云南省地质调查院，云南1∶25万腾冲县幅、潞西市幅区域地质调查报告，2008)

1.地幔分异的花岗岩；2.碰撞前花岗岩；3.碰撞后隆起的花岗岩；4.造山晚期-晚造山期花岗岩；5.非造山区花岗岩；6.同碰撞花岗岩；7.造山期后的花岗岩

Fig. 6. Discrimination R₁-R₂ diagrams (a) and discrimination Rb/30-Hf-3Ta diagrams (b) of the Ordovician granite in western Baoshan block

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图 7 保山地块西缘奥陶纪花岗岩微量元素原始地幔标准化蜘蛛图解(a)和稀土元素球粒陨石标准化图解(b) (熊昌利等，2012)

Fig. 7. Primitive mantle-normalized trace elements spider diagrams (a) and chondrite-normalized REE patterens diagrams (b) of the Ordovician granite in western Baoshan block

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图 8 三台山超基性岩铅同位素组成图解(中国地质调查局成都地质调查中心，云南1∶5万梁河幅、江东幅、帕底幅区域地质调查报告，2011)

Fig. 8. Pb-isotope compositions of ultra-basic rocks from Santaishan area

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图 9 公养河群向东逆冲推覆于奥陶系老尖山组石英砂岩之上(云南省地质调查院，云南1∶25万腾冲县幅、潞西市幅区域地质调查报告，2008)

Zgy.公养河群；O₁lj.老尖山组；S₀.层理；b.劈理；F.断层

Fig. 9. Generalized section indicating Gongyanghe Group upthrust over the quartz sandstone of Ordovician Laojianshan Formation

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