云南普朗超大型斑岩铜矿床含矿斑岩成因及其成矿意义
Origin of porphyry intrusions hosting superlarge Pulang porphyry copper deposit in Yunnan Province: Implications for metallogenesis
查看参考文献60篇
|
文摘
|
普朗超大型斑岩铜矿床位于三江特提斯构造域义敦弧南部的中甸弧内,形成于晚三叠世甘孜-理塘大洋板片向西俯冲的消减带上。与成矿作用密切相关的石英闪长岩和石英二长岩具有相似的化学组成,w(SiO_2)> 61%,w(Al_2O_3)为11. 28%~ 19. 12%,w(MgO)为1. 98%~ 4. 04%,Na_2O/K_2O比值介于0. 3~ 2. 4(平均0. 8);富集大离子亲石元素(Rb、Sr、Ba)而亏损高场强元素(Nb、Ta、Zr),具有较高的Sr/Y(27~ 63)和La/Yb(14~ 31)比值,较明显的负Eu异常,在Y-Sr/Y和Yb-La/Yb图解中,部分样品落入埃达克岩范围内,另一些样品则落入正常弧钙碱性岩石范围。普朗含矿斑岩部分样品的埃达克岩地球化学属性可能与以下地质-地球化学过程有关:晚三叠世甘孜-理塘大洋板片向西俯冲时发生脱挥发分作用导致上覆地幔楔遭受流体交代,被流体交代的地幔楔随后发生部分熔融形成正常拉斑玄武质-钙碱性岩浆,这种钙碱性岩浆在岩浆房中或侵位过程中发生角闪石、斜长石和磷灰石等矿物的分离结晶作用形成埃达克质石英闪长岩或石英二长岩。普朗含矿斑岩中黑云母和角闪石斑晶的广泛发育表明原始岩浆是富水的,这种富水环境促进角闪石的大量结晶而抑制部分斜长石的结晶,导致残余岩浆的Sr/Y比值增加,从而使部分岩石样品具有埃达克岩的地球化学特征。这种富水的原始岩浆有利于后期岩浆热液体系的形成及铜等金属元素向流体相中分配转移,并最终形成普朗超大型斑岩铜矿床。 |
|
其他语种文摘
|
The superlarge Pulang porphyry copper deposit is located in northwestern Yunnan Province. Tectonically, it lies in Zhongdian arc in the southern part of the Yidun arc that was formed as a result of the westward subduction of the Garze-Litang ocean crust in Late Triassic. Ore-related quartz diorite and quartz monzonite from the Pulang porphyritic intrusive complex are characterized by w(SiO_2) > 61%, w(Al_2O_3) ranging from 11. 28% to 19. 12%,w(MgO) from 1. 98% to 4. 04% (higher in quartz diorite), enrichment of large ion lithosphile elements (e. g.,Rb, Sr, Ba) and depletion of high field-strength elements (e. g., Nb, Ta, Zr) as well as relatively high Sr /Y (27 ~ 63) and La /Yb ratios (14 ~ 31), with distinct negative Eu anomalies. Some samples fall into the adakite field whereas the others into the normal arc magmas field in the Y-Sr /Y and Yb-La /Yb diagrams. The adakitic affinity of the Pulang ore-bearing porphyries can be interpreted as follows: in late Triassic, dehydration of the westward subducting Garze-Litang ocean crust produced solute-rich aqueous fluids resulting in metasomatization of the overlying mantle wedge, and its partial melting formed basaltic magmas that had experienced fractionation and crystallization of an assemblage consisting of amphibole, plagioclase and apatite in the magma chamber or during their ascent to generate the Pulang ore-bearing porphyries. The abundance of biotite and amphibole phenocrysts in the ore-bearing porphyries indicates that the primitive magmas were hydrous and facilitated fractionation of amphibole and suppression of plagioclase crystallization, a process well explaining the high Sr /Y ratios observed in some samples. The hydrous primitive magmas contributed to the formation of the magmatic-hydrothermal system and the transport of metal elements (e. g., Cu, Au) into the fluid phase. Further ascending of such magmas led to the exsolution of vast oreforming fluids that finally produced the Pulang porphyry copper deposit at the shallow crust level. |
|
来源
|
矿床地质
,2014,33(2):307-322 【核心库】
|
|
关键词
|
地球化学
;
分离结晶
;
斑岩铜矿
;
部分熔融
;
埃达克岩
;
普朗
|
|
地址
|
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.
广州海洋地质调查局, 广东, 广州, 510075
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0258-7106 |
|
学科
|
地质学 |
|
基金
|
国家973计划
|
|
文献收藏号
|
CSCD:5130353
|
参考文献 共
60
共3页
|
|
1.
范玉华. 云南普朗斑岩铜矿床地质特征.
中国地质,2006,33(2):352-362
|
被引
49
次
|
|
|
|
|
2.
侯增谦. 海底热水成矿系统中的流体端员与混合过程:来自白银厂和呷村VMS矿床的流体包裹体证据.
岩石学报,2003,19(2):221-234
|
被引
21
次
|
|
|
|
|
3.
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
|
|
|
|
|
4.
冷成彪. 云南中旬地区两个斑岩铜矿容矿斑岩的地球化学特征——以雪鸡坪和普朗斑岩铜矿床为例.
矿物学报,2007,27(3):414-422
|
被引
39
次
|
|
|
|
|
5.
李文昌. 西南"三江"格咱火山-岩浆弧中红山-属都蛇绿混杂岩带的厘定及其意义.
岩石学报,2010,26(6):1661-1671
|
被引
34
次
|
|
|
|
|
6.
李文昌. 云南普朗斑岩型铜矿床成矿流体特征及矿床成因.
吉林大学学报（地球科学版）,2013,43(5):1436-1447
|
被引
11
次
|
|
|
|
|
7.
庞振山. 云南普朗复式岩体锆石U-Pb年龄和地球化学特征及其地质意义.
岩石学报,2009,25(1):159-165
|
被引
28
次
|
|
|
|
|
8.
任江波. 中甸岛弧成矿斑岩的锆石年代学及其意义.
岩石学报,2011,27(9):2591-2599
|
被引
27
次
|
|
|
|
|
9.
任江波. “三江”地区中甸弧普朗成矿斑岩地球化学特征及其成因.
岩石矿物学杂志,2011,30(4):581-592
|
被引
27
次
|
|
|
|
|
10.
王守旭. 滇西北普朗斑岩铜矿锆石离子探针U-Pb年龄:成矿时限及地质意义.
岩石学报,2008,24(10):2313-2321
|
被引
36
次
|
|
|
|
|
11.
曾普胜. 滇西北中甸斑岩及斑岩铜矿.
矿床地质,2003,22(4):393-400
|
被引
91
次
|
|
|
|
|
12.
曾普胜. 中甸岛弧带构造格架及斑岩铜矿前景.
地球学报,2004,25(5):535-540
|
被引
64
次
|
|
|
|
|
13.
曾普胜. 云南普朗印支期超大型斑岩铜矿床：岩石学及年代学特征.
岩石学报,2006,22(4):989-1000
|
被引
88
次
|
|
|
|
|
14.
Barboni M. Origin of Early Carboniferous pseudo-adakites in northern Brittany (France) through massive amphibole fractionation from hydrous basalt.
Terra Nova,2011,23(1):1-10
|
被引
1
次
|
|
|
|
|
15.
Castillo P R. Petrology and geochemistry of Camiguin Island,southern Philippines: Insights to the source of adakites and other lavas in a complex arc setting.
Contributions to Mineralogy and Petrology,1999,134(1):33-51
|
被引
257
次
|
|
|
|
|
16.
Chen J L. Origin of Cenozoic alkaline potassic volcanic rocks at KonglongXiang,Lhasa terrane,Tibetan Plateau: Products of partial melting of a mafic lower-crustal source?.
Chemical Geology,2010,273(3/4):286-299
|
被引
54
次
|
|
|
|
|
17.
Chiaradia M. Cenozoic continental arc magmatism and associated mineralization in Ecuador.
Mineralium Deposita,2004,39(2):204-222
|
被引
13
次
|
|
|
|
|
18.
Chiaradia M. Rapid transition to longlived deep crustal magmatic maturation and the formation of giant porphyry-related mineralization (Yanacocha,Peru).
Earth and Planetary Science Letters,2009,288(3):505-515
|
被引
6
次
|
|
|
|
|
19.
Chung S L. Adakites from continental collision zones: Melting of thickend lower crust beneath southern Tibet.
Geology,2003,31(11):1021-1024
|
被引
332
次
|
|
|
|
|
20.
Defant M J. Derivation of some modern arc magmas by melting of young subducted lithosphere.
Nature,1990,347(6294):662-665
|
被引
1358
次
|
|
|
|
|
了解气象卫星更多信息，请访问