兰坪盆地科登涧脉状铜矿床地质、地球化学特征
Geology and geochemistry of the Kedengjian vein-type copper deposit in western Lanping basin
查看参考文献34篇
|
文摘
|
兰坪盆地西缘发育一系列脉状铜矿床,科登涧铜矿床是其组成之一。该矿床矿体主要产出于上三叠统崔依比组(T_(3C))中基性火山岩内部的断层破碎带中。热液期成矿作用可大致划分为2个成矿阶段:主成矿阶段主要发育大量含铜硫化物石英脉,晚成矿阶段主要发育贫硫化物方解石脉。流体包裹体结果表明,主成矿期石英和成矿后期石英/方解石中均主要发育两相水溶液包裹体,含CO_2包裹体极少出现。主成矿期石英脉中包裹体均一温度变化幅度较小,集中在180~240℃,盐度(NaCl_(eq),质量分数)集中在8%~14%。成矿流体主要表现出盆地热卤水的特征,这与兰坪盆地内其它Pb、Zn、Cu等贱金属矿床的成矿流体特征较为一致。成矿流体的δ~(18)O值为3.5‰~5.5‰,δD值为-62‰~ -38‰,介于岩浆水/变质水和大气降水之间。热液硫化物黄铜矿、黄铁矿、斑铜矿的δ~(34)S值显示较低的负值(-20.8‰~-9.4‰),明显有别于赋矿围岩(安山岩)的δ~(34)S值(11.1‰~11.6‰),推测该矿床成矿所需还原硫主要来自于地层硫酸盐。综合分析认为,该矿床成矿物质主要来源于地层,成矿流体主要为源于大气降水或建造水的盆地热卤水。 |
|
其他语种文摘
|
A series of sediments-hosted vein-tpye copper deposits have been discovered in the western part of the basin. The Kedengjian vein-type copper deposit is one of these deposits in Lanping basin. The Cu mineralization mainly occurs as sulfide-bearing quartz-carbonate veins in faults and fractures, hosted by volcanic rocks of Triassic Cuiyibi Formation (T_(3C)). Ore-forming process of the Kedengjian copper deposit can be divided into two stages: the major stage (massive polymetallic sulfide quartz vein stage), and the late stage (carbonate-quartz stage). A detailed study of fluid inclusions led to the recognition of two types of fluid inclusions, i.e., aqueous water, and CO_2-H_2O inclusions, with the aqueous water inclusions being dominant. Total homogenization temperatures range from 180℃ to 240℃,with corresponding salinities from 8% to 14% NaCl equivalent. These characteristics of fluid inclusions in the Kedengjian copper deposit are comparable with those of basinal mineralization systems, which formed most Pb-Zn deposits in the Lanping basin. The H, O isotope studies of inclusions in quartz suggest that the ore-bearing fluid was derived from atmospheric water. The δ~(34)S of sulfide minerals are widely variable between - 20.8‰ and - 9.4‰, indicating that the sulfur was derived from the sedimentary rocks of the basin. Comprehensive studies indicate that the ore-forming materials originated mainly from sedimentary rocks, and the ore-forming fluids were mainly composed of basinal brines, derived from formation water in strata and meteoric water. |
|
来源
|
岩石矿物学杂志
,2016,35(4):692-702 【核心库】
|
|
关键词
|
地质特征
;
地球化学
;
科登涧脉状铜矿床
;
兰坪盆地
|
|
地址
|
1.
中国地质调查局成都地质调查中心, 四川, 成都, 610081
2.
中国科学院地球化学研究所, 贵州, 贵阳, 550002
3.
成都理工大学地球科学学院, 四川, 成都, 610059
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1000-6524 |
|
学科
|
地质学 |
|
基金
|
国家自然科学基金国家杰出青年科学基金
;
国土资源部中国地质调查局项目
|
|
文献收藏号
|
CSCD:5756621
|
参考文献 共
34
共2页
|
|
1.
Bodnar R J. Revised equation and table for determining the freezing point depression of H_2O-NaCl solutions.
Geochimica et Cosmochimica Acta,1993,57:683-684
|
CSCD被引
453
次
|
|
|
|
|
2.
Chi Guoxiang. Abundance of CO_2-rich fluid inclusions in a sedimentary basin-hosted Cu deposit at Jinman, Yunnan, China: Implications for mineralization environment and classification of the deposit.
Mineralium Deposita,2011,46:365-380
|
CSCD被引
20
次
|
|
|
|
|
3.
Friedman I.
Compilation of Stable Isotope Fractionation Factors of Geochemical Interest. US Geol. Survey Prof. Paper, 440 kk,1977
|
CSCD被引
6
次
|
|
|
|
|
4.
He Longqing. Thrust-controlled, sediment-hosted, Himalayan Zn-Pb-Cu-Ag deposits in the Lanping foreland fold belt,eastern margin of Tibetan Plateau.
Ore Geology Reviews,2009,36:106-132
|
CSCD被引
51
次
|
|
|
|
|
5.
Ohmoto H. Systematics of sulfur and carbon isotopes in hydrothermal ore deposits.
Economic Geology,1972,67:551-578
|
CSCD被引
511
次
|
|
|
|
|
6.
Su Wenchao. Sediment-hosted gold deposits in Guizhou,China: products of wall-rock sulfidation by deep crustal fluids.
Economic Geology,2009,104:73-93
|
CSCD被引
11
次
|
|
|
|
|
7.
Tian Shihong. S,C,O,H isotope data and noble gas studies of the Maoniuping LREE deposit, Sichuan province, China: a mantle connection for mineralization.
Acta Geologica Sinica,2006,80:540-549
|
CSCD被引
7
次
|
|
|
|
|
8.
Xue Chunji. Two fluid systems in the Lanping basin, Yunnan, China-their interaction and implications for mineralization.
Journal of Geochemical Exploration,2006,89:436-439
|
CSCD被引
11
次
|
|
|
|
|
9.
Xue Chunji. Geologic, fluid inclusion and isotopic characteristics of the Jinding Zn-Pb deposit, western Yunnan, South China: a review.
Ore Geology Reviews,2007,31:337-359
|
CSCD被引
92
次
|
|
|
|
|
10.
董方浏. 云南兰坪盆地喜马拉雅期碱性岩40Ar/39Ar年龄及地质意义.
岩石矿物学杂志,2005,24(2):103-109
|
CSCD被引
34
次
|
|
|
|
|
11.
何龙清. 云南兰坪盆地推覆构造及其控矿作用.
地质与勘探,2004,40(4):7-12
|
CSCD被引
42
次
|
|
|
|
|
12.
何明勤.
兰坪盆地铅锌铜大型矿集区的流体成矿作用机制--以白秧坪铜钻多金属地区为例,2004
|
CSCD被引
1
次
|
|
|
|
|
13.
侯增谦. 青藏高原碰撞造山带:Ⅱ.晚碰撞转换成矿作用.
矿床地质,2006,25(5):521-543
|
CSCD被引
268
次
|
|
|
|
|
14.
侯增谦. 青藏高原碰撞造山带Pb—Zn—Ag—Cu矿床新类型：成矿基本特征与构造控矿模型.
矿床地质,2008,27(2):123-144
|
CSCD被引
98
次
|
|
|
|
|
15.
李峰.
滇西红层铜矿地质,2000
|
CSCD被引
4
次
|
|
|
|
|
16.
李文昌. 西南“三江”地区新生代构造及其成矿作用.
云南地质,2001,20(4):333-346
|
CSCD被引
37
次
|
|
|
|
|
17.
李文昌.
西南三江多岛弧盆-碰撞造山成矿理论与勘查技术,2010
|
CSCD被引
2
次
|
|
|
|
|
18.
李永森.
云南澜沧江中南段铜多金属矿床地球化学研究,2002
|
CSCD被引
1
次
|
|
|
|
|
19.
刘仕军. 云南兰坪科登涧构造热液型铜多金属矿.
云南地质,2014,33(1):51-54
|
CSCD被引
2
次
|
|
|
|
|
20.
刘家军. 兰坪—思茅盆地砂页岩中铜矿床同位素地球化学.
矿床地质,2000,19(3):223-234
|
CSCD被引
42
次
|
|
|
|
|
了解气象卫星更多信息，请访问