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2012, 31(1) 20-27 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon LA-ICP-MS U--Pb dating of diorite-porphyrite from Sishanlinchang gold deposit in Heilongjiang and its geological significance |
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GUO Jia-1, HUANG Yong-Wei-2, SUN Jing-Gui-1, TANG Chen-3, WANG Lian-Guo-4, LI Guang-Hui-2 |
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1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� The First Institute of Geology Exploration of Heilongjiang Province��Mudanjiang 157011��Heilongjiang��China; 3�� Bureau of Geology and Mineral Resources of Heilongjiang Province��Harbin 150036��China; 4�� Institute of Geological Sciences of Heilongjiang Province��Harbin 150036��China |
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Abstract��
Sishanlinchang ore deposit is a typical gold deposit in sulfide quartz vein type��and found in Bindong area in recent years�� The authors studied the zircon of diorite-porphyrite closely related to mineralization��which results show that the zircon U--Pb dating in diorite-porphyrite can be inducted six groups i. e�� 1 057 ± 9 Ma��199 ± 2 Ma��144 �� 148 Ma��115 ± 2. 7 Ma��111. 6 ± 1. 7 Ma ( n = 6��MSWD = 0. 55��probability = 0. 77) and 107. 3 ± 2. 8 Ma ( n = 3��MSWD = 0. 088��probability = 0. 92) �� Combined with considerations of the development of the regional thermal event of magma��the authors suggested that diorite magma emplaced in 115 �� 107 Ma��and its evolution underwent the strong contamination by granitic rock in Mesoproterozoic and Early Jurassic�� The mineralization occurred in the conversion stage from later Early Cretaceous to Late Cretaceous��and its metallogenetic and diagenetic background was related to mid-acid granitic magmatism by the subduction of the Pacific plate�� |
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Keywords��
zircon LA--ICP--MS U--Pb dating
diorite-porphyrite
metallogenetic and diagenetic background
Sishanlinchang gold deposit
Heilongjiang
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