【摘要】：出露于江山—紹興斷裂帶東南側(cè)的陳蔡群是浙東南地區(qū)重要的賦礦地層之一,已發(fā)現(xiàn)有多處金、銀、銅等多金屬礦床。有關(guān)這些礦床的成因,特別是成礦物質(zhì)來源一直是學(xué)者們關(guān)注的焦點(diǎn),因此陳蔡群變質(zhì)巖的元素地球化學(xué)特征也備受關(guān)注。以諸暨地區(qū)新近發(fā)現(xiàn)的周家塢銅礦為研究對象,對陳蔡群變質(zhì)巖及礦石的微量元素和稀土元素地球化學(xué)特征進(jìn)行了系統(tǒng)分析,結(jié)果表明:陳蔡群變質(zhì)巖中Au、Ag、Cu、Zn、S、Mo等元素具有較高的初始含量,為成礦提供了有利的物質(zhì)條件;陳蔡群中矽卡巖與礦石之間的稀土配分曲線均表現(xiàn)為明顯的右傾模式,一致性和繼承性的特點(diǎn)明顯,表明在周家塢銅礦中,元素的富集乃至成礦可能主要與陳蔡群變質(zhì)巖中元素自身的活化遷移有關(guān)。通過以上研究,為認(rèn)識陳蔡群在成礦中的作用提供了直接證據(jù)。
[Abstract]:Chen Cai Qun, which emerged in the southeast of Jiangshan-Shaoxing fault zone, is one of the important ore-hosting strata in southeastern Zhejiang Province. Many polymetallic deposits such as gold, silver and copper have been found. The origin of these deposits, especially the source of ore-forming materials, has always been the focus of scholars, so the element geochemical characteristics of metamorphic rocks in Chen Cai Qun have been paid more attention. The geochemical characteristics of trace elements and rare earth elements in metamorphic rocks and ores of Chencai Group were systematically analyzed with the newly discovered Zhoujiawu Copper Mine in Zhuji area. The results show that the high initial content of au _ (Ag) Cu _ (Cu) Zn ~ (+) S _ (Mo) in metamorphic rocks of Chencai Group provides favorable material conditions for mineralization, and the distribution curves of rare earth elements between skarn and ore in Chen Cai Group show an obvious right-dip pattern. The characteristics of consistency and inheritance indicate that the enrichment and mineralization of elements in Zhoujiawu copper deposit may be mainly related to the activation and migration of elements themselves in the metamorphic rocks of Chen Cai Qun. The above research provides direct evidence for understanding the role of Chen Cai Qun in metallogeny.
【作者單位】： 中國地質(zhì)科學(xué)院地球物理地球化學(xué)勘查研究所;中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;
【基金】：國土資源部公益性行業(yè)科研專項(xiàng)(2011110008)
【分類號】：P595;P618.2

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