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对分别取自贵州天柱大河边重晶石矿床和玉屏重晶石矿床的19件重晶石样品进行了锶同位素测定, 其中 17 件层状重晶石样品 Sr/86Sr 比值集中在 0.708310~0.708967 之间, 低于同期的海水 Sr/86Sr 87 87比值, 反映了成矿流体中有幔源物质的混入, 锶同位素组成可能是海水与海底热卤水混合的结果, 该过程类似于造成重晶石在海底沉积物中富集的现代洋底热水活动. 研究发现, 脉状重晶石和含黄铁矿重晶石结核的87Sr/86Sr比值明显增高, 分别为 0.709585 和0.709537, 因壳源杂质的混入导致锶同位素组成的增高. 本文锶同位素的研究为天柱大河边重晶石矿床和玉屏重晶石矿床的海底热水沉积成因提供了新的证据, 并对区分晚期叠加的重晶石矿化提供了依据.
The strontium isotopes of 19 barite samples taken from Daheian barite deposit and Yuping barite deposit in Tianzhu of Guizhou Province were measured. The Sr / 86Sr ratios of 17 lamellar barite samples were concentrated at 0.708310 ~ 0.708967, which is lower than that of the seawater Sr / 86Sr 87 87 in the same period, reflecting the mixing of mantle-derived materials in the ore-forming fluid. The strontium isotope composition may be the result of mixing seawater with seabed hot brine, The results show that the ratio of 87Sr / 86Sr in vein-like barite and barite-bearing barite with barite is obviously higher (0.709585 and 0.709537 respectively) The results show that the strontium isotopes in this paper provide new evidence for the hydrothermal sedimentary genesis of the Dahebian barite deposit and the Yuping barite deposit in Tianzhu, Stone mineralization provided the basis.