摘要
上盘围岩是矿床钻探过程中首先遇到的围岩，研究其蚀变特征具有重要的找矿指导意义。对胶东西北部露天开采的仓上金矿床的详细研究表明，上盘围岩蚀变以绿泥石化为主，蚀变分带自远矿端到近矿端依次为方解石绿泥石化带、赤铁矿绿泥石化带、绿帘石化带和绢英岩化带。黄铁矿的形态、成分和热电性标型显示，成矿过程中上盘围岩提供了丰富的Ｆｅ、Ｃｏ、Ｎｉ、Ｃｕ、Ｐｂ、Ｚｎ和Ａｕ、Ｐｔ等。上盘围岩的近矿标志是绢英岩化增强，黄铁矿的｛１００｝＋｛２１０｝增多，Ｓ、Ｃｕ、Ｐｂ、Ｚｎ和Ａｕ、Ｐｔ增高，Ｓ／Ｆｅ离子比和ｗ（Ｃｏ＋Ｎｉ）／ｗ（Ａｓ＋Ｓｂ）降低，Ｐ型黄铁矿出现率增高，蚀变岩的金含量增高。
It is important for gold prospecting to study the alteration and mineralization of hanging wall rock of gold deposit because that the hanging wall rock is first encountered during drilling in ore prospecting and exploration. Detailed studies in the open pit in Cangshang gold deposit, northwestern Jiaodong, indicate that the main alteration of hanging wall rock is chloritization, and the alteration zonation can be divided into calcitization chloritization zone, hematitization chloritization zone, epidotization zone, and phyllic alteration zone from the hanging wall rock to the ore body. The typomorphic characteristics of pyrite, which is crystal form, chemical composition and thermoelectricity show that many ore forming elements such as Fe, Co, Ni, Cu, Pb, Zn, Au and Pt were taken out from the hanging wall rock during mineralization. The indicators of closing to ore body in the hanging wall rock are the strengthening of phyllic alteration, the increasing of {100}+{210} crystal form of pyrite, the percentage of P type pyrite, the gold content in altered rock, and the contents of S,Cu,Pb,Zn,Au and Pt in pyrite, and the decreasing of the ratio of S 2- /Fe 2+ and w (Co+Ni)/ w (As+Sb).
出处
《现代地质》
CAS
CSCD
北大核心
1999年第1期73-77,共5页
Geoscience
基金
国家科委攀登计划
关键词
金矿床
围岩蚀变
黄铁矿
标型特征
alteration of hanging wall rock, typomorphism of pyrite, gold deposit of wall rock alteration type, Cangshang gold deposit, northwestern Jiaodong
