伊春-延寿构造带斑岩型钼矿矿床成因及地质特征

伊春-延寿构造带是重要的多金属成矿带，已发现多处钼矿。本文将伊春-延寿构造带成矿构造背景划分为加里东期成矿系列和印支期成矿系列。加里东期成矿系列形成于松嫩和佳木斯地块拼合、碰撞造山的大地构造背景。印支期成矿系列则形成于板内拉分-走滑的构造环境。在古太平洋俯冲挤压的背景下，与板块俯冲体制下的挤压向伸展转换的过程中，形成了一系列深大断裂带，幔源物质上涌形成了该区中生代构造岩浆岩带和相关的斑岩型钼矿床。以该构造带内的鹿鸣斑岩型钼矿床和霍吉河斑岩型钼矿床为对比分析研究对象，研究了与成矿有关的地层、构造、岩浆岩和变质岩，分析了斑岩型钼矿床地质特征及找矿标志。认为斑岩型钼矿的主要成矿时代为燕山早期；围岩蚀变呈面型展布，以钾化、石英-绢云母化为主；霍吉河钼矿床和鹿鸣钼矿床的斑岩体及围岩为偏铝质过铝质、高钾钙碱性系列的 I型花岗岩，具有类似于活动大陆边缘花岗岩的岩石组合特征。同时对伊春-延寿构造带内的找矿潜力做了评价。

MINERALIZATION MODEL AND GEOLOGIC FEATURE OF PORPHYRY MOLYBDENUM DEPOSIT IN THE YICHUN-YANSHOU TECTONIC ZONE

Yichun-Yanshou Tectonic Zone is an important polymetallic metallogenetic belt. Many porphy molybde-num deposits are discovered there. The ore-forming tectonic background of Yichun-Yanshou Tectonic Zone is di-vided into the Caledonian metallogenic series and the Indosinian metallogenic series. The Caledonian metallogenic series formed from the geotectonic background of spliced and collisional orogeny between the Songnen massif and the Jiamusi massif. The Indosinian metallogenic series formed from the geotectonic background of puii-apart and stike-slip of the plates. In the background of subduction and jams of Paleo-Pacific plate,series discordogenic faults formed during the squeezing transforming the unfolding under the effect of plate subduction. The upwelling mantle source formed the Mesozoic struetural-magmatie zone and the porphyry molybdenum deposits. The luming porphyry molybdenum deposit and the huojihe porphyry molybdenum deposit are done contrastive analysis. The lay-er,structure,magmatite and metamorphite related to the mineralization are researched in this tectonic zone. The geo-logic feature and the prospecting criteria are analysed. The metallotec period of Porphyry Molybdenum Deposit is Early YanShanian . The wall rock alteration distribute planarly,which mainly include potassium alteration,silicifica-tion and sericitization. The porphyry mass and wall rock of the luming and huojihe porphyry molybdenum deposit is the peraluminous and high-K calc-alkaline I -type granite,which have similarly rock association characteristic-sin of the Granitoids in the Active Continental Margin. The prospecting potential of Yichun-Yanshou Tectonic Zone is evaluated simultaneously.