An analysis on ore-controlling conditions and geological features of the Cu-W polymetallic ore deposit in the Zhuxi area of Jingdezhen, Jiangxi Province
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摘要:
景德镇朱溪铜钨多金属矿是近年发现的一个矽卡岩型矿床，发育在江南新元古代基底之上。在区域地层、构造、岩浆岩和最新勘探资料综合分析的基础上，本文对该矿床的地质特征和控矿地质条件进行了研究。结果表明，其矿化岩体为晚中生代花岗斑岩，晚古生代黄龙组和船山组是成矿的物质基础，矿化蚀变发育在花岗斑岩与黄龙组、船山组的接触带。矽卡岩存在分带现象，自花岗斑岩往围岩一侧，自内向外依次出现角岩带、石榴石-透辉石带、透闪石-阳起石带、含石榴石大理岩带；品位高、厚度大的矿体主要产于矽卡岩带中。在地表和浅部，存在成矿分带性；由东往西，依次出现铜→铜-白钨矿→白钨矿，成矿温度则由中温→中高温→高温，揭示一个向西北倾斜的成矿带面貌。本研究提出，该矿床的形成明显受NE向断裂构造的制约，主矿带主要分布在黄龙组与新元古代基底的接触面附近，浅部为铜或铜锌矿，往深处变为铜-白钨矿，更深处为白钨矿赋存场所。在塔前-赋春盆地东段的晚古生代碳酸盐岩盆地与花岗质岩体的接触带，是寻找矽卡岩型铜钨钼等多金属矿床最有利的远景区带。
Abstract:The Zhuxi Cu-W polymetallic ore deposit, located in the southern Jingdezhen of the middle Jiangnan belt in Jiangxi Province, is a skarn-type ore deposit in the Late Paleozoic carbonate basin on the Neoproterozoic basement. On the basis of analysis on regional-scale strata, tectonics, magmatic rocks and the recent prospecting data, this paper studies the geological features and ore-controlling conditions of the Zhuxi ore deposit. It is suggested that the Late Paleozoic Huanglong and Chuangshan formations are significant ore-bearing strata, the Late Mesozoic granitic porphyry is the mineralized body and the mineralization zone develops in the contact between the granitic porphyry and the Huanglong Formation or Chuangshan Formation. Along the direction from granitic porphyry to wall rocks, five contact-metamorphosed zones, namely, hornfels, garnet-diopside, tremolite-actinolite, and garnet-bearing marble zones occurred; industry ore bodies with high content and large thickness are distributed in the tremolite-actinolite and garnet-diopside zones. At the surface, from east to west, we can observe copper ore zone → copper-tungsten ore zone → tungsten ore zone that are corresponding to various mineralizing temperatures, namely, middle temperature → middle-high temperature → high temperature field, respectively; and this reflects a trend of ore zone dipping toward the northwest. We conclude that (1) the Zhuxi ore deposit was obviously controlled by a NE-trending fault zone during its mineralization stage; (2) major ore bodies occur in the contact zone between Huanglong Formation and Neoproterozoic slate, or between the Late Paleozoic carbonate rock and the granitic porphyry; (3) there exist a zoning of mineralized bodies from surface to underground, that is, a zinc-copper ore body in the shallow level, then a copper-tungsten ore body and finally a tungsten ore body in the deep level; and (4) the contact zone between the Late Mesozoic granitic porphyry and the Late Paleozoic carbonate strata in the eastern part of Taqian-Fuchun basin is a valuable area of metallization foreground for skarn-type polymetallic copper-tungsten ore deposits.
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图 2
江南东部朱溪铜钨多金属矿区域地质图
Figure 2.
Regional geological map of the Zhuxi Cu-W polymetallic ore deposit in the eastern Jiangnan area
图 6
研究区侵入岩的SiO2-(Na2O+K2O) 图(a, 据Wilson, 1989) 和SiO2-K2O图(b, 据Peccerillo and Taylor, 1976)
Figure 6.
SiO2-(Na2O+K2O) diagram (a, after Wilson, 1989) and SiO2-K2O diagram (b, after Peccerillo and Taylor, 1976) for intrusive rocks in the studied area
图 8
朱溪矿区铜、铜钨及钨矿体分布示意图
Figure 8.
The distribution of Cu, Cu-W and W-ore bodies in the Zhuxi ore deposit
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