Samarium–neodymium isotope systematics of hydrothermal calcites from the Xikuangshan antimony deposit (Hunan, China): the potential of calcite as a geochronometer
Samarium–neodymium isotope systematics of hydrothermal calcites from the Xikuangshan antimony deposit (Hunan, China): the potential of calcite as a geochronometer
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DOI：
10.1016/s0009-2541(03)00187-6
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发表时间：
2003-10
期刊：
影响因子：
3.9
通讯作者：
Jian‐tang Peng;R. Hu;P. Burnard
中科院分区：
文献类型：
--
作者：
Jian‐tang Peng;R. Hu;P. Burnard
锡矿山锑矿是世界上最大的锑存款矿床。锡矿山热液方解石的稀土元素丰度和Sm/Nd比值变化较大，具有MREE和HREE富集、LREE亏损的特征。Sm-Nd同位素组成的同硫化物方解石落在明确的线在等时线图。早、晚期成矿方解石形成两个明显的等时线，分别对应于155.5±1.1和124.1± 3.7Ma。等时线年龄表明锡矿山地区的锑成矿作用发生在晚侏罗世-早白垩世，与前人的地质观测和独立的同位素数据相一致。方解石的钐-钕定年显示出确定热液成矿年龄的潜力。
The Xikuangshan antimony mine located at Central Hunan, China, is the largest antimony deposit in the world. Hydrothermal calcites from the Xikuangshan Mine display relatively large variations in REE abundance and Sm/Nd ratios and are characterized by MREE- and HREE-enriched and LREE-depleted patterns. Sm–Nd isotopic compositions of syn-sulfide calcites fall on well-defined lines in the isochron plot. Calcites from early- and late-stage mineralization form two distinct isochrons corresponding to 155.5±1.1 and 124.1±3.7 Ma, respectively. The isochron ages suggest that Sb mineralization took place during the Late Jurassic–Early Cretaceous Period in the Xikuangshan district, consistent with previous geological observations and with independent isotope data. Samarium–neodymium dating of calcites shows potential for determining ages of hydrothermal mineralization.