Sphalerites Rb-Sr Dating and geological significance of the Shuitoushan Pb-Zn deposit in Yunnan Province,SW China
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摘要: 水头山铅锌矿床位于保山地块南端芦子园矿集区，区内以发育矽卡岩型和热液脉型两类铅锌矿化为特点。为查明铅锌多金属成矿作用过程，本文对水头山热液脉型铅锌矿床主成矿阶段的闪锌矿开展了Rb-Sr同位素组成测定，获得闪锌矿的Rb-Sr等时线年龄为135.8±4.2Ma(MSWD=1.70，n=6)，结合区内其他矿床的成矿年龄，认为芦子园矿集区在早白垩世发生过较大规模的铅锌多金属成矿事件。闪锌矿的初始Sr同位素组成((87Sr/86Sr)i=0.710258~0.710430)及矿石中硫化物的S、Pb同位素组成特征共同揭示，水头山铅锌矿床的成矿物质主要来源于区内深部的隐伏中酸性侵入岩，并有部分围岩物质加入。结合区内矿床地质特征和成矿地质背景，认为早白垩世腾冲地块和保山地块的碰撞造山作用引发地壳重熔，在芦子园矿集区产生大量富含Fe、Cu、Pb、Zn的花岗质岩浆，上侵就位形成隐伏中酸性岩体，并在与沙河厂组大理岩接触部位形成芦子园矽卡岩型铁铅锌矿床。此后，热液沿区内北东向和近东西向断裂继续活动，在有利空间形成水头山、放羊山和罗家寨等一系列热液脉型铅锌多金属矿床。
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关键词:
- 水头山铅锌矿床 /
- 闪锌矿Rb-Sr定年 /
- 成矿物质来源 /
- 保山地块 /
- 云南
Abstract: The Shuitoushan lead-zinc deposit is located in Luziyuan ore concentration area at the southern margin of the Baoshan block, Yunnan Province. The Luziyuan ore concentration area is characterized by the development of skarn type and hydrothermal vein type lead-zinc mineralization. The Rb and Sr isotopic composition of Sphalerite formed in the main mineralization stage of Shuitoushan hydrothermal vein lead-zinc deposit is determined to investigate the process of lead-zinc polymetallic mineralization in the area. The obtained Rb-Sr isochron age of sphalerite is 135.8 ±4.2Ma (MSWD = 1.70, n = 6), which is equivalont to the metallogenic ages of other deposits in the area, indicates that a large-scale lead-zinc polymetallic metallogenic event had occurred in Luziyuan ore concentration area in the Early Cretaceous. The initial Sr isotopic composition of sphalerite ((87Sr/86Sr) i = 0.710258~0.710430) and the existing sulfur and lead isotopic characteristics of sulfides jointly reveal that the metallogenic materials of Shuitoushan lead-zinc deposit are mainly derived from the concealed intermediate-acid intrusive rocks in the deep part of the region, with a small contribution of surrounding rocks. Basing on the geological characteristics and metallogenic geological background of the deposit in the area, we put forward the point of view that the collision orogeny of Tengchong block and Baoshan block in the Early Cretaceous triggered crustal remelting, which produced a large number of granitic magma rich in Fe, Cu, Pb and Zn in Luziyuan ore concentration area. Intrusion of these magmas led to the emplacement of the regional concealed granite body, and formed Luziyuan skarn type iron-lead-zinc deposit at the contact zone between the granite and the marble of Shahechang Formation. After that, the hydrothermal fluids continued to move along the Northeast and near East-West faults in the area, and formed a series of hydrothermal vein lead-zinc polymetallic deposits such as Shuitoushan, Fangyangshan, Luojiazhai and Pipashui. -
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