三江地区俯冲增生-碰撞造山过程中含矿斑岩的地球化学特征对比:对成矿物质源区差异的指示
Geochemical comparison of the Mesozoic and Cenozoic ore-bearing porphyries related to subduction accretion and collision orogenesis in the Sanjiang region: Implication for source variety
查看参考文献93篇
文摘
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青藏高原东南部三江地区在中-新生代时期的大洋俯冲增生和陆-陆碰撞造山过程中,为不同时期的成矿过程提供了有利的构造环境,其中最为典型的是与洋壳俯冲相关的晚三叠世中甸弧斑岩成矿区和与陆内汇聚作用相关的新生代玉龙-马厂箐斑岩成矿带。虽然上述含矿斑岩均为具有高Sr/Y比值的埃达克质岩组成特征;但两者在其他地球化学组成上还是存在一定的差异。同玉龙-马厂箐成矿带相比,中甸弧成矿区含矿斑岩有着相对较高的TiO_2含量、MgO含量、Mg~#值以及高的CaO/Na2O比值、低的Al_2O_3/TiO_2和La/Yb比值。上述地球化学组成的差异,结合研究区晚三叠世和新生代早期的构造演化,指示中甸弧成矿区含矿斑岩的母岩浆很可能为俯冲的大洋板片熔体与其上覆的地幔楔相互作用的结果,同时这些含矿熔体在随后的上升过程中并没有经历广泛的MASH(即熔融作用、同化作用、存储和均一化)过程;而玉龙-马厂箐成矿带含矿斑岩母岩浆很可能是含石榴子石角闪岩相的加厚下地壳与少量的源于富集地幔的钾质熔体相互作用并在地壳深部经历了一定程度分异的结果。 |
其他语种文摘
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Since the Mesozoic, the Sanjiang region in SE Tibet has transitioned from an oceanic subduction accretion to intra-continental collision orogeny, which has formed numerous porphyry Cu deposits, such as the Late Triassic Zhongdian arc and the Cenozoic Yulong-Machangqing porphyry Cu belts. Although these ore-bearing porphyries have some adakitic affinities (high Sr/Y ratios), there still are some differences between them in other geochemical compositions. Compared with ore-bearing porphyries developed in the Yulong-Machangqing belt, those in the Zhongdian arc have high TiO_2, MgO, Mg~#, CaO/Na_2O, and low Al_2O_3/TiO_2 and La/Yb values. These differences, when combined with tectonic evolution during the Meso-Cenozoic in the study region,indicate that the ore-bearing parent magmas of the Zhongdian arc were probably produced by the interaction between melts derived from subducted oceanic slab and overlying mantle wedges. Furthermore, these ore-bearing melts did not experience extensive melting-assimilation-storage-homogenization processes during ascent. The Yulong-Machangqing ore-bearing porphyries probably resulted from the mixing of melts originating from a thickened lower crust and the enriched mantle (potassic melts), which subsequently experienced some differentiation in the deep crust (≥ 30 km). |
来源
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地球化学
,2019,48(4):342-355 【核心库】
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DOI
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10.19700/j.0379-1726.2019.04.003
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关键词
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含矿斑岩
;
中甸弧
;
岩石地球化学
;
源区组成
;
玉龙-马厂箐
;
三江地区
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地址
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1.
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
2.
中国科学院大学, 北京, 100049
3.
(北京)中国地质大学地球科学与资源学院, 北京, 100083
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0379-1726 |
学科
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地质学 |
基金
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国家重点研发计划
;
国家自然科学基金
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文献收藏号
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CSCD:6576113
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参考文献 共
93
共5页
|
1.
Richards J P. Geologic evolution of the Escondida area, northern Chile: A model for spatial and temporal localization of porphyry Cu mineralization.
Econ Geol,2001,96(2):271-306
|
被引
52
次
|
|
|
|
2.
Sillitoe R H. A plate tectonic model for the origin of porphyry copper deposits.
Econ Geol,1972,67(2):184-197
|
被引
158
次
|
|
|
|
3.
Mitchell A H G. Relationship of porphyry copper and circum-pacific tin deposits to paleo-Benioff zones.
Inst Min Metal,1972,81:B10-B25
|
被引
1
次
|
|
|
|
4.
Kelser S E. Intrusive rocks associated with porphyry copper mineralization in island arc areas.
Econ Geol,1975,70(3):515-526
|
被引
7
次
|
|
|
|
5.
Jorhan T E. Andean tectonics related to geometry of subducted Nazca plate.
Geol Soc Am Bull,1983,94(3):341-361
|
被引
8
次
|
|
|
|
6.
Solomon M. Subduction, arc reversal, and the origin of porphyry copper-gold deposits in island arcs.
Geology,1990,18(7):630-633
|
被引
39
次
|
|
|
|
7.
Bektas O. Porphyry copper systems as markers of the Mesozoic-Cenozoic active margin of Eurasia: Comment.
Tectonophysics,1990,172(1/2):191-194
|
被引
2
次
|
|
|
|
8.
芮宗瑶. 西藏斑岩铜矿对重大地质事件的响应.
地学前缘,2004,11(1):145-152
|
被引
71
次
|
|
|
|
9.
侯增谦. 冈底斯斑岩铜矿成矿带有望成为西藏第二条"玉龙"铜矿带.
中国地质,2001,28(10):27-29,40
|
被引
105
次
|
|
|
|
10.
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
|
|
|
|
11.
Hou Z Q. The Himalayan Yulong porphyry copper belt: Product of large-scale strike-slip faulting in eastern Tibet.
Econ Geol,2003,98(1):125-145
|
被引
201
次
|
|
|
|
12.
Hou Z Q. The Miocene Gangdese porphyry copper belt generated during post-collisional extension in the Tibetan orogeny.
Ore Geol Rev,2009,36(1/3):25-51
|
被引
143
次
|
|
|
|
13.
Hou Z Q. Porphyry Cu (-Mo-Au) deposits related to melting of thickened mafic lower crust: Examples from the eastern Tethyan metallogenic domain.
Ore Geol Rev,2011,39(1):21-45
|
被引
73
次
|
|
|
|
14.
侯增谦. 三江地区义敦岛弧造山带演化和成矿系统.
地质学报,2004,78(1):109-120
|
被引
158
次
|
|
|
|
15.
Hou Z Q. Sanjiang Tethyan metallogenesis in S.W. China: Tectonic setting, metallogenic epochs and deposit types.
Ore Geol Rev,2007,31(1/4):48-87
|
被引
176
次
|
|
|
|
16.
Yin A. Geologic evolution of the Himalayan-Tibetan orogen.
Annu Rev Earth Planet Sci,2000,28:211-280
|
被引
1687
次
|
|
|
|
17.
Tapponnier P. Oblique stepwise rise and growth of the Tibet plateau.
Science,2001,294(5547):1671-1677
|
被引
1235
次
|
|
|
|
18.
季建清. 青藏高原东南部新生代挤出块体西边界.
科学通报,2000,45(2):128-135
|
被引
30
次
|
|
|
|
19.
Hou Z Q. Metallogenesis of the Tibetan collisional orogen: A review and introduction to the special issue.
Ore Geol Rev,2009,36(1):2-24
|
被引
140
次
|
|
|
|
20.
王保弟. 三江上叠裂谷盆地人支雪山组火山岩锆石 U-Pb定年与地质意义.
岩石矿物学杂志,2011,30(1):25-33
|
被引
29
次
|
|
|
|
|