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地质科学  1995, Vol. Issue (4): 329-337    DOI:
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多宝山斑岩铜矿区水热蚀变矿物的激光显微探针40Ar/39Ar定年
刘驰, 穆治国, 刘如曦, 黄宝玲
北京大学地质学系 北京 100871
40Ar/39Ar LASER MICROPROBE DATING ON HYDROTHERMAL MINERALS FROM DUOBAOSHAN PORPHYRY COPPER MINING DISTRICT, HEILONGJIANG PROVINCE, CHINA
Liu Chi, Mu Zhiguo, Liu Ruxi, Huang Baoling
Department of Geology, Peking University, Beijing 100871
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摘要 在利用脉冲显微激光探针40Ar/39Ar定年技术测定标准样品的J值和年龄适用范围的基础上,研究了黑龙江省嫩江县北部多宝山斑岩铜矿区水热成因矿物的年代学。结果表明,高钾含量的水热蚀变矿物适合于激光探针的表面微区测定,并且可以克服水热蚀变矿物中的39Ar “反冲”丢失对年龄结果的影响。矿区的岩浆-水热事件主要有两期,分别为253-220Ma和184-162Ma,前者代表了成矿时代,后者反映出由成矿期后岩浆活动所引起的水热叠加事件。
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刘驰
穆治国
刘如曦
黄宝玲
关键词40Ar/39Ar定年   激光显微探针   斑岩铜矿   水热蚀变矿物     
Abstract: The hydrothermal alteration assemblages of Duobaoshan porphyry copper district indicate a spatial distribution of ore bodies and ore belts. They are mainly divided into K-silicate alteration zone, quartz-sericite alteration zone and chlorite-epidotecalcite alteration zone. Some K-rich hydrothermal minerals, produced in K-silicate zone and quartz-sericite zone:K-feldspar, biotite, sericite and illite, are considered to be directly associated with the hydrothermal events of mineralization and ore forming period.The experiment used laser microprobe 40Ar/39Ar dating technique equipped with a Nd-YAG pulsing laser. The background level of mass spectrometer is 36Ar≈1×10-15mol, 37Ar≈4×10-16 mol, 39Ar≈2×10-15 mol, 40Ar≈9×10-15 mol, with a measurement of atmospheric Ar isotopes being (40Ar/36Ar)A≈295.3±1.0(1σ). We determined two K-rich standard samples:K-feldspar (SB-778, K-Ar method, recommend.ed as (1.84±0.08)Ma) and muscovite (KF-1M, Rb-Sr method, recommended as 803Ma). The results of laser microprobe 40Ar/39Ar dating are (2.6±0.1) Ma and (785.5 ±6.5) Ma, respectively.Following electron microprobe studies, the whole rock samples collected from mineralization zone were made of a thin section about 0.5 mm in thickness. Then,the hydrothermal minerals are measured in situ by means of laser microprobe 40Ar/39Ar technique under a microscope’s location. The age results of ten samples show that there are two major periods of hydrothermal events:253-220 Ma and 184-162 Ma,respectively, corresponding to the Late-Variscan and the Early-Yanshanian magmatic activities in the district.It is considered that Late-Variscan magmatic activities formed the mineralization intrusion of granodiorite and granodiorite porphyry bodies, and Early-Yanshanian magmatic intrusion mostly emerged in the northwest of structural belts of the district without porphyry copper mineralization. Therefore, the period of hydrothermal mineralization is 253-220 Ma while another hydrothermal period, 184-162 Ma,reflects an superimposed influence of magmatic-hydrothermal activities on the mineralization zones.
Key words40Ar/39Ar dating   Laser microprobe   Porphyry copper deposit   Hydrothermal mineral   
收稿日期: 1994-11-07;
引用本文:   
刘驰,穆治国,刘如曦等. 1995, 多宝山斑岩铜矿区水热蚀变矿物的激光显微探针40Ar/39Ar定年. 地质科学, (4): 329-337.
Liu Chi,Mu Zhiguo,Liu Ruxi et al. 40Ar/39Ar LASER MICROPROBE DATING ON HYDROTHERMAL MINERALS FROM DUOBAOSHAN PORPHYRY COPPER MINING DISTRICT, HEILONGJIANG PROVINCE, CHINA[J]. Chinese Journal of Geology, 1995, (4): 329-337.
 
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