湖南黄沙坪铅锌多金属矿区岩浆岩地球化学特征

湖南黄沙坪铅锌多金属矿区岩浆岩位于骑田岭西北部，主要有英安斑岩、花斑岩、石英斑岩、花岗斑岩，K—Ar法年龄为141．1～164Ma，ω（SiO2）=69．98％～77．00％，ω（Al2O3）普遍大于ω（CaO＋Na2O＋K2O），属铝过饱和岩石。岩石稀土元素ω（∑REE）=118×10^-6～311×10^-6平均276×10^-6，稀土元素球粒陨石值标准化配分曲线均为平缓右倾曲线，δ（Eu）=0．25～0．48，具铕的负异常。微量元素的亲铜元素普遍偏高，有为本矿床提供成矿物质来源的可能。根据地球化学特征并与区域对比，认为矿区岩浆岩属过渡性岩浆成因，既有深源型又有浅源型的特点，且经历过结晶分异和较强的交代作用。

GEOCHEMICAL CHARACTERISTICS OF MAGMATIC ROCKS OF HUANGSHAPING LEAD-ZINC DEPOSIT IN HUNAN,CHINA

Magmatic rock in Huangshaping Pb-Zn poly-metallic ore deposit is located in the northwest of Qitianling, Hunan province mainly consisting of dasitic porphyry, granoporphyry, quartz porphyry and granitic porphyry. The intrusive rockes are determined at age of 141. 1-164. 00 Ma with ω（SiO2） = 69.98 %-77.00 % and ω（Al2O3 ） 〉ω（CaO＋ Na2 O＋ K2 O） belonging to the Al-saturated rock. ω（∑REE） is in range of 118×10^-6-311×10^-6. The chondrite-normalized REE pattern shows gentle curve line oblique to right and negative Eu anomaly （δ（Eu）：0. 25-0. 48）. Mocro-elements of the intrusive rocks are characterized by higher chalcophile element content that is the evidence of their supplying ore materials to Huangshaping Pb-Zn poly-metallic ore deposit. Based on the geochemical feature and regional correlation magmatic rocks in the deposit is of transitional genesis and characterized by both deep source and shallow source and crystalline differentiation and strong metasomatism.