冈底斯带甲玛矿区花岗斑岩类年代学、地球化学及岩石成因

孟元库; 马士委; 许志琴; 陈希节; 马绪宣

doi:10.3799/dqkx.2018.713

冈底斯带甲玛矿区花岗斑岩类年代学、地球化学及岩石成因

doi: 10.3799/dqkx.2018.713

1.
山东科技大学地球科学与工程学院, 山东青岛 266590
2.
中国地质调查局青岛海洋地质研究所, 山东青岛 266071
3.
中国地质科学院地质研究所, 北京 100037
4.
南京大学地球科学与工程学院, 江苏南京 210023

基金项目:

国土资源部公益性行业基金项目 201511022

中国地质调查局项目 DD20160137

山东省自然科学基金博士基金项目 ZR2017BD033

中国博士后基金项目 2017M612220

详细信息

作者简介:
孟元库(1986-), 男, 博士, 研究方向为造山带构造

中图分类号: P588.121;P588.122;P597.3
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-15
- 刊出日期: 2018-04-15

Geochronology, Geochemistry and Petrogenesis of the Granitoid Porphyries from Jiama Ore Deposit in Gangdese Belt

Meng Yuanku^{1,2,3
,},
Ma Shiwei³,
Xu Zhiqin^3,4,
Chen Xijie³,
Ma Xuxuan³

1.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

摘要

摘要: 藏南冈底斯带中新世斑岩成因主要存在残留洋壳的部分熔融、加厚下地壳的部分熔融、陆下岩石圈的部分熔融和俯冲流体交代基性下地壳的部分熔融四种观点.为了进一步阐明该时期的岩浆成因和大地构造背景，对冈底斯带甲玛矿区不同类型的斑岩体进行了岩石学分析和LA-ICP-MS锆石U-Pb测试，并运用X荧光光谱仪和电感耦合等离子体质谱仪分别对样品进行了全岩主、微量元素测试.测试结果显示冈底斯带甲玛矿区的斑岩类形成于16.7~14.4 Ma，总体上具有埃达克质岩石的地球化学特征.其中花岗斑岩类来自于藏南加厚的基性新生下地壳的部分熔融，而辉长闪长玢岩来源于富集的岩石圈地幔.早中新世以来（18~13 Ma）青藏高原处于构造转换阶段，含矿的埃达克质岩浆沿断裂通道上升，并且在上升过程中遭受到了中上地壳物质的混染，演化形成甲玛矿区内石英闪长玢岩、花岗闪长斑岩、二长花岗斑岩和花岗斑岩，而近乎同时期来自于岩石圈地幔的岩浆则演化形成辉长闪长玢岩；矿区内含矿热液流体在岩浆热驱动和构造应力作用下，在林布宗组砂板岩、角岩与多底沟组大理岩、灰岩的层间滑脱带或褶皱的构造虚脱空间就位，形成冈底斯带甲玛矽卡岩型铜多金属主矿体.
- 埃达克质 /
- 斑岩体 /
- 中新世 /
- 甲玛 /
- 冈底斯带 /
- 岩石学
Abstract: The petrogenesis of Miocene porphyries is still under debate, involving four different genetic models, such as, partial melting of residual oceanic crust, partial melting of thickened lower crust, partial melting of sub-continental lithospheric mantle and partial melting of metasomatized mafic lower crust related to subducted fluids. In order to clarify the petrogenesis and tectonic setting, petrological analyses and zircon LA-ICP-MS U-Pb dating in this study were carried out. In addition, whole-rock major and trace elements were analyzed by means of XRF and ICP-MS methods. The results demonstrate that the porphyries formed at 16.7-14.4 Ma, showing adakitic geochemical features. Geochemical characteristics, trace elemental ratios and discrimination diagrams suggest that magma source of the granitoid porphyries was derived from partial melting of the lower juvenile crustal material, whereas magma source of gabbro diorite porphyrite was sourced from the enriched lithospheric mantle. Together with published data, it is proposed that the Qinghai-Tibetan plateau was in the tectonic transformation from compression to extension or strike-slip during 18-13 Ma in the early stage of Miocene. The ore-bearing porphyries ascended through vertical fractures or faults and mingled with mid-upper crustal material generating granite porphyry, monzonitic granite porphyry, granodiorite porphyry and quartz diorite porphyrite. On the contrary, the coeval magma derived from the lithosphere mantle formed gabbro diorite porphyrite. Ore-bearing hydrothermal fluid was driven by tectonic stress and heat flow from magma took place at the sandstone slate and hornfel of the Linbuzong Formation, and marble and limestone of the Duodigou Formation characterized by inter-bedded tectonic fracture belts and collapse locations of folds, forming skarn-type copper polymetallic ore deposits.
- adakitic /
- porphyry pluton /
- Miocene /
- Jiama /
- Gangdese belt /
- petrology

HTML全文

图 1 青藏高原大地构造格架简图(a)和冈底斯带甲玛矿区及邻区地质构造简图(b)

图a据Yin and Harrison, 2000; JSSZ.金沙江缝合带; BNSZ.班公湖怒江缝合带; IYZSZ.印度斯雅鲁藏布江缝合带; 1.花岗岩类; 2.叶巴组火山岩; 3.典中组; 4.基性岩; 5.设兴组; 6.第四系; 7.楚木龙组; 8.林布宗组; 9.塔克那组; 10.多底沟组; 11.却桑温泉组; 12.三叠系麦隆岗组; 13.二叠系洛巴堆组; 14.石炭系松多岩组; 15.岔萨岗岩组; 16.褶皱冲断带; 17.逆冲断层; 18.正断层

Fig. 1. Tectonic simplified framework of the Tibetan plateau (a) and simplified geological map of the Jiama ore deposit and adjacent regions in the Gangdese belt (b)

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图 2 冈底斯带甲玛铜多金属矿集区地质简图

据唐菊兴等，2011; 钟康惠等，2012.1.第四系; 2.下白垩统楚木龙组; 3.下白垩统林布宗组; 4.上侏罗统多底沟组; 5.上侏罗统却桑温泉组; 6.下-中侏罗统叶巴组; 7.花岗斑岩; 8.岩脉; 9.矽卡岩型1号主矿体; 10.矽卡岩矿体(SK-skarn); 11.地质界线; 12.正断层; 13.逆断层; 14.倒转向斜; 15.倒转背斜; 16.硅帽; 17.甲玛滑脱带

Fig. 2. Simplified geological map of the Jiama copper polymetallic deposit and adjacent regions, southern Tibet

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图 3 冈底斯带甲玛铜多金属矿床矿化斑岩代表性锆石阴极发光CL图像

Fig. 3. CL images of representative zircons of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 4 冈底斯带甲玛铜多金属矿床矿化斑岩年龄谐和图

Fig. 4. Concordia diagrams for zircons of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 5 冈底斯带甲玛铜多金属矿床矿化斑岩主量元素判别图

图a据Maniar and Piccoli(1989); 图b据Middlemost(1994); 图c据Peccerillo and Taylor(1976); 图d据Irvine and Baragar(1971).1.橄榄辉长岩; 2.亚碱性辉长岩; 3.辉长闪长岩; 4.闪长岩; 5.花岗岩闪长岩; 6.花岗岩; 7.石英岩; 8.碱性辉长岩; 9.二长辉长岩; 10.二长闪长岩; 11.二长岩; 12.石英二长岩; 13.正长岩; 14.似长石辉长岩; 15.似长石二长闪长岩; 16.似长石二长正长岩; 17.似长石正长岩

Fig. 5. Discriminative diagrams of major elements of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 6 冈底斯带甲玛铜多金属矿床矿化斑岩SiO₂和主要氧化物的Harker图解

Fig. 6. Harker diagrams of the SiO₂ and oxides of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 7 冈底斯带甲玛铜多金属矿床矿化斑岩原始地幔标准化微量元素蛛网图和稀土元素球粒陨石标准化曲线图

图a~d据标准化据Sun and McDonough(1989); 图e~h据标准化据Boynton(1984)

Fig. 7. Primitive mantle-normalized trace element spider diagrams and chondrite-normalized rare earth element distribution patterns of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 8 冈底斯带甲玛铜多金属矿床矿化斑岩SiO₂ vs.微量元素Harker图解

Fig. 8. Harker diagrams of SiO₂ vs. trace elements of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangese belt

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图 9 冈底斯带甲玛铜多金属矿床矿化斑岩年龄统计

Fig. 9. Statistical graph of geochronological ages of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 10 冈底斯带甲玛矿区花岗斑岩的地球化学亲缘性判别图解

底图据Richards and Kerrich(2007); 红色虚线修自秦克章等(2014); 浅灰色区域代表埃达克岩的成分区域

Fig. 10. Geochemical discrimination diagrams for porphyry rocks from Jiama ore deposits in the Gangdese belt

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图 11 冈底斯带甲玛铜多金属矿床矿化斑岩SiO₂ vs.微量元素判别图解

据Wang et al.(2006); 秦克章等(2014)

Fig. 11. Discrimination diagrams of the SiO₂ vs. trace elements of mineralized porphyry from the Jiama copper polymetallic deposit in the Gangdese belt

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图 12 冈底斯带甲玛铜多金属矿床矿化斑岩岩浆源区判别图解

图a据Patino Douce(1999); 图b据朱弟成等(2008)

Fig. 12. The magma source discriminative diagrams of mineralized porphyries from the Jiama copper polymetallic deposit in the Gangdese belt

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图 13 冈底斯带甲玛铜多金属矿床矿化斑岩部分熔融判别图解

据Schiano et al.(2010)

Fig. 13. Partial melting discriminative diagrams of mineralized porphyry from Jiama copper polymetallic deposit in the Gangdese belt

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图 14 冈底斯带甲玛铜多金属矿床岩浆-成矿模式

据Chung et al.(2005); 秦克章等(2014); Hou et al.(2015)修改

Fig. 14. Magma-metallogenic model of the Jiama copper polymetallic deposit in the Gangdese belt

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