滇东北龙街地区泥盆系热液白云岩特征及其成矿指示意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

滇东北龙街地区泥盆系热液白云岩特征及其成矿指示意义

Characteristics of Devonian hydrothermal dolomite in the Longjie area of Northeastern Yunnan and its mineralization indicative significance

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DOI	10.20086/j.cnki.yskw.2025.4129
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(1)
作者	曾毓灿，魏爱英*，薛传东，周红琳，马怀昆，陆双交，李徽琪，毛荣威，周发帅,
作者单位	1. 西南林业大学水土保持学院, 云南昆明 650224; 2. 昆明理工大学地球科学系, 云南昆明 650093; 3. 云南冶金资源股份有限公司, 云南昆明 650000
摘要	热液白云岩(HDS)是MVT Pb-Zn矿床的重要赋矿围岩。然而,热液白云岩的特征沿断层的展布规律不明,使其作为MVT矿床的找矿指示尚不明确。扬子地台西南缘川滇黔MVT Pb-Zn矿集区普遍具有HDS赋矿的特点。本文选取滇东北龙街勘查区的赋矿HDS为研究对象,通过地质填图和岩相学观察,结合矿物的元素组成和C-O同位素分析,并与埋藏白云岩对比,系统查明了容矿HDS沿断层的展布特征。结果表明: ① 赋矿HDS沿走滑正断层或逆冲断层上盘的次级断裂产出,且沿断层上盘的展布范围大于断层下盘。HDS通过交代断层两侧的灰岩或白云岩而形成,离断层的距离越近颜色越浅,白云石结晶粒度越大; ② 赋矿HDS中V、Cr、Cu、Zr、Rb、Ba含量高于埋藏白云岩,其含量距离断层越远反而越高; 稀土元素配分模式呈右倾型,具有δCe负异常(0.61~0.98)及δEu弱正异常(0.74~1.07),且均沿断层向两侧递减; ③ 区内HDS的白云石化处于还原环境,经历了由埋藏到构造热液作用过程,流体沿断层向两侧运移。因而,HDS的V、Rb、Zn、Pb含量及δ¹³C值由断层向围岩递增,可作为MVT Pb-Zn矿床的找矿评价指标。
Abstract	The hydrothermal dolomite (HDS) is a significance ore-bearing wall rock of the MVT Pb-Zn deposit. However, the distribution pattern of hydrothermal dolomite along faults remains unclear, making it as a prospecting indicator of MVT deposit is uncertain. The MVT Pb-Zn ore concentration area in Sichuan, Yunnan and Guizhou on the southwestern margin of the Yangtze platform is generally characterized by HDS ore-endowments. This study focuses on the ore-bearing HDS in the Longjie exploration area of northeastern Yunnan. Through geological mapping and petrographic observation, combined with mineral elemental composition and C-O isotope analysis, and a comparison with buried dolomite, the distribution characteristics of ore-bearing HDS along faults were systematically clarified. The results indicate: ① The ore-bearing HDS is produced along the secondary fracture of the upper disk of the strike-slip normal fault or thrust fault, and the distribution range along the upper disk of the fault is larger than that of the lower disk of the fault. HDS is formed by accounting limestone or dolomite on both sides of the fault. The closer the distance from the fault, the shallower the color, and the larger the crystal size of dolomite. ② The contents of V, Cr, Cu, Zr, Rb and Ba in HDS are higher than those in buried dolomite, and the farther away from the fault, the higher the content is. The distribution pattern of rare earth elements is right-inclined, there are δCe negative anomalies (0.61~0.98) and δEu weak positive anomalies (0.74~1.07), both of which decrease symmetrically away fromt the fault. ③ The dolamitization of HDS in the area occurred in a reduced environment and underwent a process from burial to tectonic hydrothermal alteration, with fluid migrating to both sides along the fault. Therefore, the contents of V, Rb, Zn, Pb and δ¹³C value of HDS increase from the fault to the surrounding rock, which can sever as effective exploration indicators for MVT Pb-Zn deposits.
关键词	热液白云岩(HDS)；岩石学特征；岩石地球化学；C-O同位素；泥盆系；滇东北
KeyWord	hydrothermal dolomite (HDS); petrographic characteristics; petrogeochemistry; C-O isotopes; Devonian system; Northeastern Yunnan
基金项目
页码	51-67

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曾毓灿，魏爱英*，薛传东，周红琳，马怀昆，陆双交，李徽琪，毛荣威，周发帅. 滇东北龙街地区泥盆系热液白云岩特征及其成矿指示意义 [J]. 岩石矿物学杂志. 2025; 44; (1). 51 - 67.

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