多宝山铜矿硫同位素空间分布特征

多宝山铜矿是一大型斑岩铜矿床.矿床位于大兴安岭隆起带与松辽沉降带的接舍部位.矿区出露的地层主要是奥陶系中统多宝山组地层岩性主要为安山岩、凝灰岩、凝灰质砂岩、砂岩;侵入岩主要是华力西晚期花岗闪长斑岩和花岗闪长岩;围绕花岗闪长斑岩体具有蚀变分带现象,由内向外分为钾化带-绢云母化带-青磐岩化带,矿体多产于绢云母化带内;研究表明,多宝山铜矿形成于中低温条件下,矿体内金属硫化物具有分带性,由矿体中心向边缘依次是斑铜矿-黄铜矿-黄铁矿.文章对多宝山铜矿硫同位素空问分布特征以及与矿体富集部位的对应关系进行了分析,并解释了形成这一现象的原因.

DISTRIBUTION CHARACTER OF SULFUR ISOTOPE IN THE DUOBAOSHAN COPPER DEPOSIT

Duobaoshan Cu deposit is a big porphyry copper deposit, which is located in the bound of Daxinhnling uplift zone and Songliao subsidence zone. Outcrop strata are mainly middle Ordovician Duobaoshan formation. Intrusive rocks mainly include granodiorite porphyry and granodiorite in the late period of Variscan movement. Around granodiorite porphyry there exists wallrock alteration zonation, showing potassium alteration, sericitization and propvlitization zonation from inner to outside. Ore bodies are most located in sericitization zone. It is shown that Duobaoshan Cu deposit was formed in a low temperature, in which metal sulfides have zonation as bornite, chalcopyrite and pyrite from the center to the edge. Based on sulfur isotope distribution character and homologous relationship with bonanza in Duobaoshan Cu deposit, some forming characters are analyzed.