玲珑金矿西山脉岩SHRIMP锆石UPb年龄

Zircon SHRIMP UPb Age of Xishan Vein Rock in Linglong Gold Deposit

摘要:

SHRIMP IIe MC具备高分辨、高灵敏、高精度和微量及原位微区分析的特点，可以进行20μｍ范围内的原位同位素分析，保持了测定对象原有的性质。玲珑西山脉岩锆石的氧同位素值显示了幔源数据特征，也具较强的壳源特征，这指示了再循环地壳或沉积物的贡献。SHRIMP UPb定年测试得出，55号脉的成岩年龄为(125.80±0.86)Ma，成矿时代为早白垩世，后地金矿的成岩年龄为(142.77±0.96)Ma，成矿时代是燕山早期。

Abstract:

SHRIMP IIe MC has the characteristics of high resolution, high sensitivity, high precision, trace analysis and in-situ analysis. In-situ istopic analysis within the scope of 20μm can be carried out. Thus, the original property of the determination object can be kept. Zircon oxygen isotopic value of Xishan vein rocks in Linglong gold deposit shows the characteristics of mantle-derived source. It also has the characteristics of crust source. It indicates the contribution of recycled crust or sediments. As showed by SHRIMP UPb zircon dating, rock-forming age of No. 55 vein is (125.80±0.86)Ma, metallogenic age is the early Cretaceous; while rock-forming age of Houdi gold deposit is (142.77±0.96)Ma, and metallogenic age is the early Yanshan.