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Stable Isotope Characteristics of Uranium Desposits in Southern Zhuguangshan Granitic Batholith, Guangdong, China
Author(s) -
ZHU Minqiang,
LU Xiaoliang,
WU Tie
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12381_48
Subject(s) - batholith , china , key (lock) , chinese academy of sciences , geography , geology , mining engineering , archaeology , seismology , computer science , tectonics , computer security
sources are discussed through analyzing the sulfur isotope of pyrite and published carbon, hydrogen and oxygen isotopic data from main uranium deposits in southern Zhuguang granitic batholith. Sulfur isotope studies show that the δS value is -0.2‰~-0.5‰ in pyrite from nonmineralized fresh diabase that intrude in granite, -6.5‰~ -10.9‰ in pyrite from mineralized cataclastic diabase that cut by fault and -17.4‰~-17.9‰ in pyrite from uraniumrich granitic cataclasite formed by fault. The δS value is significant different between the uranium-rich granitic cataclasite and non-mineralized diabase that indicate the sulfur of uranium-rich ore is not possible from diabase, which may from the surrounding wall rock by hydrothermal extraction. δDH2O-δOH2O plot map shows that hydrogen and oxygen isotopic of quartz vein of metallogenic stage are located in mixing area between the metamorphic water, primary magmatic water or mantle fluid and atmospheric precipitation water. Due to the big time differences between uranium mineralizaion and granite wall rock, also during uranium mineralization there is no obvious regional metamorphism, so the metallogenic fluid is impossible from metamorphic water or primary magmatic water. The changes of δOH2O may be caused by isotope exchange reaction between the wall rock and atmospheric precipitation when the hydrothermal temperature arising. The C value of deposits is -9.8‰~ -4.3‰ that fall in range of southern China granite and mantle carbon C value. Combined with the feature of sulfur, hydrogen and oxygen isotopes, it is inferred that the carbon in the metallogenic fluid may also come from wall rock granite.