帮助 关于我们

返回检索结果

冈底斯带南部新特提斯洋早期俯冲有关岩浆特征与成矿分析
Magmatic properties and metallogenic analyses of magmatism triggered by early Neo-Tethys subduction in South Gangdese, Tibet

查看参考文献65篇

邹银桥 1   陈喜连 1   黄文婷 1   张健 1   梁华英 1 *   许继峰 2   陈玲 3  
文摘 冈底斯南缘经历了新特提斯洋俯冲及其后的陆陆碰撞,发育众多后碰撞环境的斑岩铜矿床,而与洋壳俯冲有关斑岩型矿床却发现不多,目前仅有雄村斑岩型铜金矿床。本工作在冈底斯南缘东西向200多千米范围内发现多个铜矿化岩体及火山岩。岩体锆石U-Pb年龄显示其侵位于早中侏罗世。这些铜矿化岩体及火山岩多发育脉状帘石化蚀变,而其周围新生代岩基多未发生蚀变及矿化,显示矿化及蚀变早于新生代岩基;而磁铁矿-赤铁矿-黄铜矿矿物组合表明铜矿化与岩浆磁铁矿的氧化还原过程有关,矿化时代与岩体基本同期。矿化岩体多富含角闪石,发育磁铁矿-赤铁矿组合,显示岩浆富水氧化特征,而岩浆期榍石、磷灰石及石英中发育原生流体包裹体,显示富水岩浆较早出溶挥发分。综合区内早中生代岩浆岩的时空分布,冈底斯南缘存在东西向的侏罗纪弧岩浆岩带。该套岩浆岩具有典型弧岩浆地球化学特征,锆石ε_(Hf)(t)值(+10 ~ +16)显示近亏损地幔端元的源区特征。上述证据表明,冈底斯南缘在早中生代发生了大范围的岩浆活动和同期铜矿化,新生下地壳或亏损地幔源区可提供良好的Cu金属来源,高氧化富水的母岩浆有利于亲铜元素的富集与成矿,为斑岩铜矿床形成的有利条件。据此,我们提出冈底斯南缘在早中侏罗世可能存在一个包括雄村斑岩型铜金矿床在内的高氧化岩浆岩和矿化带,其与新特提斯洋洋壳在侏罗纪俯冲引发的大规模的岩浆活动相关,该带具备良好的斑岩铜矿找矿前景。鉴于冈底斯南缘在白垩纪之后经历了大规模抬升和剥蚀,在该地区寻找新的俯冲型斑岩铜金矿床应主要集中在早中侏罗世火山岩出露区。
其他语种文摘 South Gangdese has experienced the Neo-Tethys subduction and subsequent collision between the Indian and Eurasian plates. Many post-collision-related porphyry Cu-Mo deposits have been found in the South Gangdese belt. However, only the Xiongcun super-large porphyry Cu-Au deposit was identified as relating to the Neo-Tethys subduction in the South Gangdese belt. This work reports several Cu-mineralized intrusions in the South Gangdese belt, which are distributed widely from the west to the east. Zircon U-Pb ages show that they were emplaced in the Early Mesozoic. Such Cu-mineralized igneous rocks generally develop quartz-epidote vein alterations, while the surrounding Cretaceous-Cenozoic Gangdese granitic batholith did not undergo any corresponding alteration and mineralization. This finding suggests that Cu mineralization and alteration occurred earlier than the batholith's formation. The chalcopyrite-magnetite-hematite mineral assemblage shows that Cu mineralization was related to the redox process of the magmatic magnetite. Thus, the mineralization was coeval with the intrusions. These Jurassic rocks have high hornblende content and quartz-magnetite-titanite and hematite-magnetite mineral assemblages, indicating they originated from highly oxidized and water-rich magmas. The primary fluid inclusions found in the magmatic sphere and apatite of mineralized intrusions indicate that their parental water-rich magmas existed in an exsolved volatile phase during the early stage of the magma evolution process. The temporal and spatial distributions of the Early Mesozoic magmatic rocks show the existence of a west-east magmatic rock belt parallel to the Yarlung Zangbo suture zone in the South Gangdese. These Early Mesozoic magmatic rocks show typical arc magma characteristics, and have high positive zircon ε_(Hf)(t) (+10 ~ + 16),providing evidence of a mantle-derived magma source. The above findings imply that South Gangdese developed large-scale magmatism associated with Cu mineralization in the Early Mesozoic. These Jurassic magmatic rocks originated from a juvenile lower crust, which provided a good Cu metal source. Further, their parental magmas were highly oxidized water-rich magmas, favoring the concentration and mineralization of chalcophile elements during the magma evolution process. Thus, it is proposed that the Early-Middle Jurassic subduction of the Neo-Tethys slab induced a west-east oxidized arc magmatic rock belt and contemporary Cu mineralization in the South Gangdese belt. The results reveal there was good potential for the creation of subduction-related porphyry Cu deposits. Given the strong uplift and denudation in South Gangdese after the Cretaceous, the domains of the Early-Middle Jurassic volcanic rocks or intrusions associated with Cu mineralization in this area are a good prospecting target for subduction-related porphyry Cu deposits.
来源 地球化学 ,2017,46(6):497-510 【核心库】
关键词 冈底斯南缘 ; 早中生代岩浆岩 ; 富水高氧化岩浆带 ; 斑岩型铜矿床
地址

1. 中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广东, 广州, 510640  

2. 中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广东, 广州, 510640  

3. 钦州学院, 广西北部湾海洋灾害研究重点实验室, 广西, 钦州, 535011

语种 中文
文献类型 研究性论文
ISSN 0379-1726
学科 地质学
基金 中国科学院战略性先导科技专项 ;  科技部国家重点研究计划
文献收藏号 CSCD:6105176

参考文献 共 65 共4页

1.  Chung S L. Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism. Earth Sci Rev,2005,68(3/4):173-196 被引 358 次    
2.  Harris N B W. Geochemical characteristics of collisionzone magmatism. Geol Soc London Spec Pub,1986,19(1):67-81 被引 206 次    
3.  Hou Z Q. The Miocene Gangdese porphyry copper belt generated during post-collisional extension in the Tibetan Orogen. Ore Geol Rev,2009,36(1):25-51 被引 143 次    
4.  Yang Z M. Geology of the post-collisional porphyry copper-molybdenum deposit at Qulong, Tibet. Ore Geol Rev,2009,36(1/3):133-159 被引 77 次    
5.  李光明. 西藏冈底斯成矿带斑岩铜矿的成岩成矿年龄. 大地构造与成矿学,2004,28(2):165-170 被引 90 次    
6.  林武. 冈底斯铜矿带冲江含矿斑岩的岩石化学及锆石SHRIMP年龄特征. 地球化学,2004,33(6):585-592 被引 26 次    
7.  孟祥金. 西藏冈底斯成矿带驱龙铜矿Re-Os年龄及成矿学意义. 地质论评,2003,49(6):660-666 被引 87 次    
8.  莫济海. 西藏冲木达铜-金（钼）矿床黑云角闪二长花岗岩锆石U-Pb年龄及其意义. 地球化学,2008,37(3):206-212 被引 23 次    
9.  曲晓明. 冈底斯斑岩铜矿（化）带:西藏第二条“玉龙”铜矿带－. 矿床地质,2001,20(4):355-366 被引 205 次    
10.  芮宗瑶. 冈底斯斑岩铜矿成矿时代及青藏高原隆升. 矿床地质,2003,22(3):217-225 被引 156 次    
11.  Tafti R. Jurassic U-Pb and Re-Os ages for the newly discovered Xietongmen Cu-Au porphyry district, Tibet, PRC: Implications for metallogenic epochs in the southern Gangdese belt. Econ Geol,2009,104(1):127-136 被引 45 次    
12.  Tang J X. Geological characteristics and genesis of the Jurassic No. I porphyry Cu-Au deposit in the Xiongcun district, Gangdese porphyry copper belt, Tibet. Ore Geol Rev,2015,70(4):438-456 被引 49 次    
13.  邹银桥. 西藏冈底斯南缘雄村铜金矿床成矿斑岩厘定及其锆石U-Pb和黑云母Ar-Ar年龄分析. 岩石学报,2015,31(7):2053-2062 被引 4 次    
14.  Wang C. Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt, southern Lhasa terrane: Implications for early subduction of Neo-Tethyan oceanic lithosphere. Lithos,2016,262:320-333 被引 56 次    
15.  Meng Y K. Late Triassic crustal growth in southern Tibet: Evidence from the Gangdese magmatic belt. Gondw Res,2015,37:449-464 被引 5 次    
16.  Chu M F. Zircon U-Pb and Hf isotope constraints on the Mesozoic tectonics and crustal evolution of southern Tibet. Geology,2006,34(9):745-748 被引 231 次    
17.  Guo L S. Petrogenesis of Early to Middle Jurassic granitoid rocks from the Gangdese belt, Southern Tibet: Implications for early history of the Neo-Tethys. Lithos,2013,179(5):320-333 被引 35 次    
18.  Ji W Q. Zircon U-Pb geochronology and Hf isotopic constraints on petrogenesis of the Gangdese batholith, southern Tibet. Chem Geol,2009,262(3/4):229-245 被引 303 次    
19.  Kang Z Q. Geochronology and geochemistry of the Sangri Group Volcanic Rocks, Southern Lhasa Terrane: Implications for the early subduction history of the Neo-Tethys and Gangdese Magmatic Arc. Lithos,2014,200/201:157-168 被引 75 次    
20.  张宏飞. 冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成:新特提斯洋早侏罗世俯冲作用的证据. 岩石学报,2007,23(6):1347-1353 被引 106 次    
引证文献 1 篇

1 郎兴海 西藏雄村矿集区含矿斑岩成因及构造意义:来自年代学及地球化学的约束 岩石学报,2019,35(7):2105-2123
被引 8 次

显示所有1篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护：中国科学院文献情报中心
地址：北京中关村北四环西路33号 邮政编码：100190 联系电话：(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号