摘要
黑龙江多宝山斑岩铜矿位于兴—蒙海西期造山带的东端。该区早古生代的演化受制于兴—蒙洋向东偏北消减于布列亚—佳木斯地块之下,火山弧呈近北西向;晚古生代的演化受制于兴—蒙洋向北西消减于克鲁伦—额尔古纳地块之下,构造线为北东走向。多宝山矿床的金属铜是多来源的,主要矿源层是中奥陶世弧火山岩,次要矿源层是早泥盆世裂谷火山岩。中海西期的中性侵入岩也提供了部分矿源,但它对成矿更主要的贡献是三期脉动式的热液活动成为高背景场中铜元素迁移和富集的主要动力。金属铜在从围岩中汲取出来富集就位于斑岩体周围的同时,在矿区及邻区较大范围内形成铜元素的降低区。多宝山斑岩铜矿的成矿期是中海西期。晚海西-印支期和燕山期的构造—岩浆事件中有其它类型的铜(或铜-多金属)矿床形成,并使多宝山斑岩铜矿遭受改造。
The Duobaoshan porphyry copper deposit in NW Heilongjiang province is situated in eastern sector of the Xing＇anling-Mongolian（for short, Xing-Meng）orogen. The regional tectonic evolution in Early Paleozoic was constrained by east （ to north） ward subduction of the Xing-Meng ocean under the Burean-Jiamusi Block, and the Middle Ordovician volcanic arc was NW-striking. The tectonic evolution in Late Paleozoic was controlled by northwestward subduction of the Xing-Meng ocean under the Kerlen-Ergun Block, with the structural line（the Devonian rifting and Permian magmatic arc）being NE-striking. The Cu-source in Duobaoshan area might be of multiple origin, with the main source layer being the Middle Ordovician arc-volcanic rocks, and the minor source one being the Early Devonian rift volcanics. Although the Middle Hercynian granodiorite and granodioritic porphyry might support a part of mineral source, its main contribution to the mineralization could be concluded that the pulsating hydrothermal activities were dynamics for migration and enrichment of copper in a high background. The copper was absorbed from the wallrocks enriched and emplaced in the surrounding positions of the porphyries, and meanwhile some Cu-descended positions appeared in the mining and adjacent areas. The metallogenic epoch of the Duobaoshan porphyry copper deposit was Middle Hercynian, when three stages of hydrothermal activity accompanied the Late Carboniferous volcanism, the intrusions of granodiorite and granodioritic porphyry respectively. The copper or copper-polymetallic ores of other types formed in the Late Hercynian-Indosinian and Yanshanian tectonothermal events, and the Duobaoshan porphyry copper deposit was reformed in these later orogenies.
出处
《地质科学》
CAS
CSCD
北大核心
2008年第4期671-684,共14页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
斑岩铜矿
金属来源
富集规律
中海西期
兴—蒙造山带
黑龙江多宝山
Porphyry copper deposit, Metal sources, Enrichment laws, The Middle Hercynian movement,The Xing＇anling-Mongolian orogen, Duobaoshan in Heilongjiang
