甘肃金川Ⅱ号岩体辉石化学特征及其地质意义
MINERAL CHEMISTRY AND GEOLOGICAL SIGNIFICANCE OF PYROXENE FROM SEGMENT Ⅱ OF THE JINCHUAN INTRUSION, GANSU PROVINCE
查看参考文献34篇
|
文摘
|
金川Ⅱ号岩体主要由二辉橄榄岩和硫化物橄榄岩构成，单斜辉石和斜方辉石为岩相中主要造岩矿物，单斜辉石含量一般高于斜方辉石。矿物间的结构关系表明主要造岩矿物的结晶顺序为：橄榄石-斜方辉石-单斜辉石-斜长石。单斜辉石的TiO_2，Al_2O_3，Cr_2O_3和Na2O质量分数依次为：0．29％～1．26％、3．17％～3．59％、0．86％～1．14％、0．29％～0．57％，斜方辉石的TiO_2，Al_2O_3，Cr_2O_3和Na2O质量分数普遍低于单斜辉石，依次为：0．16％～0.40％、1．85％～2．38％、0．48％～0.68％、0．03％～0．10％。元素间的相关关系显示辉石的类质同像置换方式为：~(MI)Fe~(2＋) ＋2Si=^MITi＋2^IVAl,^MIFe~(2＋) ＋Si=^MIFe^3＋ ＋~(IV) Al,Fe~(3＋)和Ti进入矿物晶格置换Fe~(2＋)来平衡Al置换Si产生的正电价差。两种辉石较低的TiO_2，Al_2O_3和Na_2O质量分数显示出母岩浆为拉斑玄武岩浆的特征。二辉石温度计和单辉石温度计算表明斜方辉石的结晶温度下限和单斜辉石结晶温度上限大致在1146℃～1166℃之间，单斜辉石的结晶一直持续到1032℃或者更低。金川Ⅱ号岩体单斜辉石演化明显表现出向透辉石端员偏离，暗示岩浆在结晶分异过程中，可能与富钙质围岩发生了同化混染作用。 |
|
其他语种文摘
|
The Segment Ⅱ of the Jinchuan intrusion was composed mainly of lherzolite and sulfide dunite. Clinopyroxene and orthopyroxene were the main minerals for the two rock types, with the content of the former more than the latter one. The relationship of mineral texture indicated that the successive crystallization sequence of the Segment Ⅱ was olivine, orthopyroxene, clinoyroxene and plagioclase. Chemical analysis of cliopyroxene was characterized by TiO_2 （0. 29%- 1.26% ）, Al_2O_3（3.17%-3.59%）, Cr_20_3（0.86%-1.14%） and Na_2O （0.29%-0.57%）, and orthopyroexen by TiO_2 （0.16%-0.40%）, Al_2O （1.85%-2.38%）, Cr_2O_3 （0.48%-0.68%） and Na_2O （0.03%-0.10%）. The correlations of elements of pyroxene suggested that the elements substitution in pyroxenes were ： ~(MI)Fe~(2＋) ＋2Si=^MITi＋2^IVAl,^MIFe~(2＋) ＋Si=~(MI)Fe~(3＋) ＋~(IV) Al. The octahedral bound Fe~(3＋) and the octahedral Ti entered pyroxene crystal structure and replaced Fe~(2＋) to balance the Al in the tetrahedral site and replaced the tetrahedral Si. The lower contents of TiO_2, Al_2O and Na_2O of pyroxene demonstrated that the sources of magma of the intrusion were characteristic of basalt magma. Equilibrium temperature of pyroxene was calculated by two- pyroxene geothermometers （T_(BM85) and T_(BK90) ） and single-pyroxene geothermometer （T_(NT00Di)）. The results showed that the lowest crystallization temperature of orthopyroxene and the highest of cli- nopyroxene were 1 146 ℃ to 1 166 ℃ and the crystallization temperature of clinopyroxene persisted to 1 032 ℃ or lower. The evolution of pyroxene from segment II of the Jinchuan intrusion leaned to diopside obviously,which imply that the magma assimilated carbonate-rich rock when it experienced fractional crystallization. |
|
来源
|
矿物岩石
,2008,28(1):88-96 【核心库】
|
|
关键词
|
金川岩体
;
辉石
;
辉石地质温度计
;
单斜辉石压力计
;
类质同像
;
同化混染
|
|
地址
|
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1001-6872 |
|
学科
|
地质学 |
|
基金
|
国家自然科学基金
;
中国科学院“百人计划”项目
|
|
文献收藏号
|
CSCD:3246085
|
参考文献 共
34
共2页
|
|
1.
汤中立.
金川铜镍硫化物(含铂)矿床成矿模式及地质对比,1995
|
CSCD被引
61
次
|
|
|
|
|
2.
Chai Gang. The Jinchuan uhramfic intrusion:cumulate of a high-Mg basaltic magma.
Journal of Petrology,1992,33:277-303
|
CSCD被引
54
次
|
|
|
|
|
3.
苟国朝. 金川超镁铁杂岩体中硅酸盐和氧化物的矿物化学特征.
甘肃地质,1990,11:43-70
|
CSCD被引
2
次
|
|
|
|
|
4.
吴志勇. 金川铜镍硫化矿床成矿温度压力计算及成矿.
矿物岩石,1992,12(1):89-95
|
CSCD被引
1
次
|
|
|
|
|
5.
徐庆生. 金川超镁铁质岩体矿物化学特征及矿物地质温度计压力计研究.
甘肃地质学报,1994,3(1):59-70
|
CSCD被引
4
次
|
|
|
|
|
6.
De Waal S A. Emplacement of viscous mushes in the Jinchuan ultramafic intrusion,westem China.
The Canadian Mineralogist,2004,42:371-392
|
CSCD被引
22
次
|
|
|
|
|
7.
Yang X Z. Muhiphase melt inclusions in the Jinchuan complex China:implications for petrogenic and metallogenie physico-chemical conditions.
International Geology Renew,1998,40:335-349
|
CSCD被引
8
次
|
|
|
|
|
8.
Yang X Z. Genesis of the Jinchuan PGE deposit China:evidence from fluid inclusions mineralogy and geochemistry of precious elements.
Mineralogy and Petrology,2006,86:109-128
|
CSCD被引
14
次
|
|
|
|
|
9.
史基安. 金川超镁铁质岩元素及稀有气体同位素地球化学特征.
矿物岩石,2005,25(1):45-51
|
CSCD被引
5
次
|
|
|
|
|
10.
Lehmann J. Field relationships and geochemical constraints on the emplacement of the J inchuan intrusion and its Ni-Cu-PGE sulfide deposit Gansu China.
Economic Geology,2007,102:75-94
|
CSCD被引
27
次
|
|
|
|
|
11.
Song XY. Role of crustal contamination in formation of the Jinchuan intrusion and its world-class Ni-Cu(PGE)sulfide deposit northwest China.
International Geology Review,2006,48:1-20
|
CSCD被引
5
次
|
|
|
|
|
12.
宋谢炎. 含矿岩浆通道对于岩浆铜镍硫化物矿床找矿工作的意义.
矿物岩石地球化学通报,2005,24(4):293-298
|
CSCD被引
14
次
|
|
|
|
|
13.
Chai Gang. Pyroxene Mineral Chemistry of the Jinchuan Intrusion China.
Mineralogy and Petrology,1994,51:1-20
|
CSCD被引
4
次
|
|
|
|
|
14.
Poldervaart A. Pyroxenes in the crystallization of basaltic magma.
The Journal of Geology,1951,59:472-489
|
CSCD被引
21
次
|
|
|
|
|
15.
Troger WE.
Optische bestimmung der gesteinsbildenden minerale,Teil 1 Bestimmungstabellen,1971:1-147
|
CSCD被引
1
次
|
|
|
|
|
16.
Campbell I H. The geochemistry of pyroxenes from the lower layered series of the Jimberlana intrusion Western Australia.
Contributions to Mineralogy and Petrology,1974,47:281-297
|
CSCD被引
14
次
|
|
|
|
|
17.
Li C. Compositional variations of olivine from the Jinchuan Ni-Cu sulfide deposit western China:implication for ore genesis.
Mineralium Deposita,2004,39:159-172
|
CSCD被引
33
次
|
|
|
|
|
18.
杨合群. 金川硫化铜镍矿床成矿岩浆性质和源区特征讨论.
甘肃地质学报,1997,6(1):44-52
|
CSCD被引
11
次
|
|
|
|
|
19.
Le Bas M J. The role of alurainum in igneous clinopyroxenes with relation to their parentage.
American Journal of Science,1962,260:267-288
|
CSCD被引
45
次
|
|
|
|
|
20.
邱家骧. 浙闽新生代玄武岩的岩石成因学与Cpx矿物化学.
火山地质与矿产,1996(17):16-25
|
CSCD被引
31
次
|
|
|
|
|
了解气象卫星更多信息，请访问