湘中锡矿山锑矿床成矿物质来源的同位素示踪

本文利用放射成因同位素（Pb、Sr)和轻稳定同位素（C、O）对锡矿山超大型锑矿床的成矿物质来源进行了示踪，从物源角度揭示了其在规模成矿、元素发生超常富集的原因。研究表明，锡矿山锑矿床的成矿物质不可能是来自赋矿围岩；深部地幔和基底都卷入了该矿的成矿作用；富Sb的交代型地幔和富Sb的元古界基底为其大规模成矿提供了充足的矿源，两者是形成锡成山超大型锑矿床的前提条件。

ISOTOPE TRACING OF ORE-FORMING MATERIALS FOR THE XIKUANGSHAN ANTIMONY DEPOSIT, CENTRAL HUNAN

The Xikuangshan deposit located at Central Hunan, China, is the largest antimony deposit and the only superlarge one so far reported in the world. Despite previous detailed geological investigations, no agreement has been reached on the source of ore forming materials. The objectives of this contribution are to trace the origin of ore forming materials of the Xikuangshan antimony deposit using the radiogenic isotopes (Pb, Sr) and stable isotopes (C and O), and to reveal the large scale mineralization and super enrichment of the element Sb at Central Hunan. It is indicated that the ore forming materials were unlikely to be derived from the ore hosting strata in situ , the upper mantle and the Proterozoic basement were involved in Sb mineralization at Xikuangshan, which provided sufficient Sb for the large scale mineralization. The Sb enriched upper mantle and Sb enriched Proterozoic basement in this region are requisites for the large scale mineralization at the Xikuangshan antimony deposit.