矿床地质2012，Vol.31Issue(6)：1326-1336,11.
辽西河坎子碱性侵入杂岩体及钼多金属矿床同位素年代学研究
Isotopic age dating of the alkaline intrusive complex and its related molybdenum polymetallic deposit at Hekanzi, western Liaoning Province
摘要
Abstract
The newly discovered Hekanzi deposit is a medium-size porphyry molybdenum deposit in western Liaoning Province. Intrusive complexes are widely distributed in the study area, with the Mesozoic alkaline and calc-alka-line rocks being the most developed alkaline rocks. They intruded into the Precambrian and Paleozoic volcanic-sedimentary rocks in the forms of batholiths, stocks, and dykes. Alkaline intrusive rocks are mainly miascite, alkaline syenite and alkaline diabase. The calc-alkaline rocks are mainly granite porphyry, granodiorite, biotite granite and K-feldspar granite. Isotopic ages of the Hekanzi alkaline granite and its related Mo polymetallic deposit have been determined. The rock-forming age of the biotite-orthoclase granite is (235.3 ± 1.0) Ma with MSWD value of 0.68. Re-Os isotopic data of six molybdenite separates define a correlation line corresponding to an age of (224.0 ?1.3) Ma with MSWD value of 0.72. The metallic minerals in the ore are pyrite, chalcopy-rite, molybdenite, pyrrhotite, marcasite and a little scheetine. Gangue minerals are mainly calcite, fluorite, garnet, serpentine, peridotite, dolomite, feldspar, plagioclase and quartz. The NE-trending, NS-trending and NW-trending fault zones are widely distributed in the alkaline intrusive complex and its related molybdenum polymetallic deposit at Hekanzi.关键词
地球化学/锆石LA-ICP-MS铀-铅年龄/辉钼矿Re-Os同位素年龄/钼多金属矿床/碱性侵入杂岩体/河坎子/辽西Key words
geochemistry/ zircon LA-ICP-MS U-Pb dating/ molybdenite Re-Os isotopic dating/ molybdenum polymetallic deposit/ alkaline intrusive complex/ Hekanzi/ western Liaoning Province分类
天文与地球科学引用本文复制引用
刘勇,聂凤军,方俊钦..辽西河坎子碱性侵入杂岩体及钼多金属矿床同位素年代学研究[J].矿床地质,2012,31(6):1326-1336,11.基金项目
本文得到国家重点自然科学基金项目(编号:41030421)和地质调查项目(编号:1212010911029)的资助 （编号:41030421）
