(1. 中南大學(xué) 有色金屬成礦預(yù)測(cè)與地質(zhì)環(huán)境監(jiān)測(cè)教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083)
摘 要: 一六礦床是粵北鎢錫多金屬礦床中一個(gè)重要的鎢礦床。礦區(qū)內(nèi)出露的寶山、一六兩期巖體的巖性均為二長(zhǎng)花崗巖，具有高硅、過鋁質(zhì)、富鉀和鈣堿性等相似特征，為分異的S型花崗巖。兩期巖體源區(qū)相同，繼承了陸內(nèi)造山向板內(nèi)伸展環(huán)境過渡的沉積物質(zhì)，經(jīng)歷了巖石圈沉積巖和早期火成巖的部分熔融，并通過巖漿結(jié)晶分異作用使W、Sn等成礦元素富集。將礦床內(nèi)的矽卡巖分為兩組：第一組Rb、Sr、Ba等大離子親石元素虧損程度低，稀土元素總量(∑REE)高，具有顯著的Eu負(fù)異常；第二組Rb、Sr、Ba等元素虧損程度高，∑REE值較低，具有弱Eu異常。兩組矽卡巖是礦區(qū)內(nèi)兩期熱液活動(dòng)作用的產(chǎn)物，寶山巖體與帽子峰組砂巖發(fā)生接觸交代作用形成矽卡巖型白鎢礦，一六巖體出溶熱液沿矽卡巖中的裂隙充填交代形成石英脈型白鎢礦，這兩期熱液成礦事件反映了一六鎢礦復(fù)合型礦床的本質(zhì)。
關(guān)鍵字: 一六鎢礦床；S型花崗巖；結(jié)晶分異；兩期成礦
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:Yiliu deposit is an important tungsten deposit of W-Sn polymetallic deposits in Northern Guangdong. The lithology of Baoshan and Yiliu intrusion exposed in the mineral area are both adamellite. Two stages of intrusions which have similar geochemical characteristics: high-SiO2, peraluminous, K-rich and calc-alkaline, belong to differentiated S-type granite. These intrusions have the same source region which inherits the sediment transition from the intran-continent orogeny environment to intraplate extensional environment, experiences the partial melting of sedimentary rocks and early stage igneous rocks, and enriches the ore-forming elements, such as W and Sn, mainly through the fractional crystallization of magma. The skarn is divided into two groups. The first group of skarn is slightly depleted in large ion lithophile elements, such as Rb, Sr, Ba, and has the high total REE content, with significant negative Eu anomaly. The second group of skarn is highly depleted in large ion lithophile elements and has the lower total REE content, with slightly Eu anomaly. It is believed that the two groups of skarn in the mineral area are the product of the two hydrothermal activities. The skarn type scheelite was formed by contact metasomatism between Baoshan intrusion and sandstone of Maozifeng Formation. Yiliu intrusion’s dissolution hydrothermal filling and metasomatism occurring along the cracks of skarn formed quartz vein type scheelite. The two stages of hydrothermal mineralization events reflect the nature that Yiliu tungsten deposit is a composite deposit.
Key words: Yiliu tungsten deposit; S-type granite; fractional crystallization; two metallogenic stages
