摘要
城门山、武山铜矿床是由斑岩型-矽卡岩型-似层状硫化物型、矽卡岩型和似层状硫化物型组成的“多位一体”铜矿床。本文概括了成矿与岩浆侵入活动、断裂构造和围岩性质的关系;对三种类型矿石的空间分布、金属元素的分带、黄铁矿的特征元素、稳定同位素特征及成矿温度等进行了较详细的阐述。根据三类矿石的密切联系和相似性,提出了它们是在同一岩浆成矿作用下彤成的一组有内在联系的铜矿床。
The Chengmenshan and Wushan copper deposits are two rather typical 'several types in one system' copper deposits in middle and lower reaches of the Yangtze River. Metallization is controlled by deep-source epizonalsuperepizonal intermediate-acid complexes, ore deposits are closely related to intrusive bodies in time and space, and ore-forming elements and mineralizer elements of orebodies assume zonal distribution around the intrusive body; the specialization of chemical composition of rocks and the highly-abundant metallic elements in rock bodies are consistent with ore-forming element associations of the ore deposits. The regional NWW-trending tectomagmatic belt controls the stretching of the orebelt. The intersections of NW-, NE-and NEE-, NNE-trending faults of different grades seem to be the localities of ore fields and ore deposits. The fissure zones within rock bodies, the contact zone between the rock body and the Carboniferous-Triassic limes- tone, and cataclastic zone between the clastic rock of Wutong Formation and the carbonate rock of Huanglong Formation outside the rock body control the production of porphyry type orebodies, sharn type orebodies and stratiform sulfide type orebodies respectively.
The stratiform sulfide type copper deposit bears close resemblance to its associated porphyry type and skarn type copper deposits in a series of characteristics such as zoning of ore-forming elements, Co/Ni and S/Se ratios of pyrite, stable isotopes (δ^(34)S, δ^(18)O_(H_2O), δD_(H_2O), ^(206)Pb/^(204)Pb, ^(207)Pb/^(204)Pb and ^(208)Pb/^(204)Pb) and ore-forming temperatures; nevertheless, these deposits are obviously different from typical sedimentary type, volcanogene sedimentary type and sedimento-metamorphic or hydrothermal superimposed stratabouud deposits.
The above characteristics further prove that the three types of copper orebodises are a set of internally-related ore deposits formed when ore fluids entered different structural-wall rock spaces under the action of the same magmatic-hydrothermal action. It is thus uggested that they should be named skarn 'three types in one system' metallogenic model in a broad sense.
出处
《矿床地质》
CAS
CSCD
北大核心
1990年第4期291-300,308,共11页
Mineral Deposits
