中国台湾龟山岛热液自然硫中微观包体的元素富集特征
Elemental Enrichment in the Microscopic Inclusions of the Native Sulfur from Kueishantao Hydrothermal System, Taiwan, China

台湾东北部的龟山岛浅海热液体系产生大量的热液自然硫.为了理解微量元素在自然硫中的富集规律和机制，采用激光剥蚀等离子体质谱仪(LA-ICPMS)对龟山岛自然硫进行了元素含量分析.结果显示，硫磺基底仅含有As、Se和Te等岩浆脱气产生的挥发性亲铜元素.Fe、Mn、Co、Ni等亲铁元素主要来自于安山岩基岩，富集于富铁或含硅包体中.Al、Zn、Ba、Pb、La、Ce、Au、Ag等元素显著富集于含硅包体中，表明这些元素受硅酸盐矿物控制.富铜包体具有最高的Hg、Pb、Zn等亲铜元素的单位富集程度.首次对龟山岛热液自然硫中的微量元素分布进行了原位微区分析，有助于理解微量元素在热液活动中的来源、分布和分配等地球化学行为.
The Kueishantao shallow-water hydrothermal system, offshore northeast Taiwan, discharges large amounts of native sulfur. In order to unveil the distribution of trace elements in the native sulfur, we analyzed the elemental contents of sulfur matrix and microscopic inclusions in the KST native sulfur by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). The results indicate that the sulfur matrix only contains volatile chalcophile elements such as As, Se, and Te, which are mainly originated from magma degassing. The siderophile elements including Fe, Mn, Co, and Ni are mainly contributed by the andesite host rock of the KST system. These elements are enriched in the Fe-rich and/or Si-bearing inclusions as various sulfides. Al, Zn, Ba, Pb, La, Ce, Au, and Ag were significantly enriched in Si-bearing inclusions, suggesting that the occurrence of these elements was mainly controlled by silicate particles.The Cu-rich inclusions contain higher per unit chalcophile elements (Hg, Pb, and Zn) than Fe-rich inclusions. The distribution of trace elements is analyzed in-situ in the KST native sulfur for the first time. This study will help to better understand the geochemical behaviors of trace elements during hydrothermal processes