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Contribution of crustal and mantle sources to genesis of Sn, B and Pb-Zn deposits in South Sikhote-Alin subprovince (Russian Far East): evidence from high–precision MC-ICP-MS lead isotope study
Ore Geology Reviews ( IF 3.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.oregeorev.2020.103683
A.V. Chugaev , I.V. Chernyshev , V.V. Ratkin , V.G. Gonevchuk , O.A. Eliseeva

Abstract South Sikhote-Alin metallogenic subprovince (SSAP) is located in the southern part of the Sikhote-Alin orogenic belt. It encompasses more than one hundred well-known deposits and occurrences of boron, tin, lead, and zinc. These deposits have been genetically related to the Late Cretaceous and Paleocene granitoid magmatism. Pb isotope composition was measured using the MC-ICP-MS method in 20 SSAP deposits. Pb isotope ratios (48 samples of galena) vary within narrow limits: 206Pb/204Pb ranges from 18.321 to 18.474, 207Pb/204Pb − 15.608–15.655, and 208Pb/204Pb 38.601–38.796. The high degree of homogeneity of the Pb isotope composition and absence of correlations between the lead isotope characteristics of the deposits, on the one hand, and the age and type of ore mineralization, on the other, indicate the presence of a regional uniform Pb source for all the SSAP deposits. The results of Pb-Pb studies of the different rocks of the SSAP suggest that the source was most likely the Mesozoic sedimentary sequences of the Sikhote-Alin accretionary complexes. In turn, individual lead isotope characteristics of the SSAP deposits are caused by varibale contribution of mantle source to the overall balance of lead.

中文翻译:

地壳和地幔源对南锡霍特-阿林亚省(俄罗斯远东)锡、硼和铅锌矿床成因的贡献:来自高精度 MC-ICP-MS 铅同位素研究的证据

摘要 南锡霍特-阿林成矿亚省(SSAP)位于锡霍特-阿林造山带南部。它包括一百多个著名的硼、锡、铅和锌矿床和矿床。这些矿床在成因上与晚白垩世和古新世花岗岩类岩浆作用有关。使用 MC-ICP-MS 方法在 20 个 SSAP 沉积物中测量了 Pb 同位素组成。铅同位素比(方铅矿的 48 个样本)在狭窄的范围内变化:206Pb/204Pb 的范围从 18.321 到 18.474、207Pb/204Pb - 15.608-15.655 和 208Pb/204Pb 16.38.70 一方面,铅同位素组成的高度同质性和铅同位素特征与矿床的年龄和类型之间缺乏相关性,另一方面,表明所有 SSAP 矿床都存在区域统一的铅源。对 SSAP 不同岩石的 Pb-Pb 研究结果表明,其来源很可能是 Sikhote-Alin 增生杂岩的中生代沉积层序。反过来,SSAP 矿床的个别铅同位素特征是由地幔源对铅整体平衡的可变贡献引起的。
更新日期:2020-10-01
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