中国地质2012，Vol.39Issue(5)：1162-1171,10.
黑龙江鹿鸣钼矿区花岗岩锆石年龄、地球化学特征及其地质意义
Geochronology and geochemistry of granite of the Luming molybdenum deposit in Heilongjiang and their geological significance
摘要
Abstract
The recently—discovered Lumin molybdenum deposit is located in the southern section of the Yichun— Yanshou polymetallic ore—forming belt. The ore—forming rocks mainly include adamellite —granite porphyry, and the LA -ICP - MS micro- situ isotopic analysis shows that their ages arel95.4±1.4 Ma and 197.6±1.3 Ma, suggesting products of the late Indosinian — Early Yanshanian period. Geochemical studies indicate that SiO2 (wt%) values vary in the range of 3.36%～5.78% .whereas K2O and Na2O vary in the range of 3.36%～5.78% and 2.60%～3.78% respectively. Rittmann indexes vary between 0.9 and 3.1. Analysis shows that the intrusions belong to high—K calc—alkaline—shoshonitic series. The EREE values are low with a strong fractionation between light and heavy rare earth elements (LaN/YbN=7.76～26.47) and obvious Eu negative anomaly (Eu/Eu*=0.34～0.62). Trace elements display enrichment of Rb, Th , U , K and depletion of Nb , Ta, Ti, Y, Yb , suggesting that the source might have been a relatively water—rich magma, or the magma might have suffered from metasomatism by subduction zone fluid. Combined with results of previous studies, it is concluded that the formation of the deposit was probably controlled by the subduction of Pacific plate in early Mesozoic.关键词
鹿鸣钼矿/锆石U-Pb年龄/岩石地球化学/太平洋板块俯冲Key words
Luming molybdenum deposit/zircon U-Pb age/geochemistry/subduction of Pacific plate分类
天文与地球科学引用本文复制引用
马顺清,陈静..黑龙江鹿鸣钼矿区花岗岩锆石年龄、地球化学特征及其地质意义[J].中国地质,2012,39(5):1162-1171,10.基金项目
国土资源大调查项目(资[2010]矿评01-20-06)资助. （资[2010]矿评01-20-06）
