内蒙古乌兰哈达一楚鲁达板地区铀矿化特征及找矿方向
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关键词：乌兰哈达一楚鲁达板;矿化特征;找矿方向；火山岩型铀矿;次火山岩型;蚀变裂隙带型doi：10.13278/j.cnki.jjuese.20240009 中图分类号：P619.14 文献标志码：A
Abstract： The Wulanhada-Chuludaban area in Inner Mongolia is located in the middle section of the Zhalantun volcanic rock-type uranium mineralization prospecting zone and is one of the hydrothermal uranium polymetalic mineralization clusters in Northern China. The area experienced intense and frequent Mesozoic volcanic eruptions， providing excellent geological conditions for mineralization and promising exploration prospects. Through the colltion of previous data，comprehensive mapping，and uranium geological survey and evaluation，the geological characteristics and ore-controlling factors of volcanic rock-type uranium deposits in the Wulanhada-Chuludaban area have been preliminarily summarized. Through driling verification，it is found that the volcanic rock-type uranium deposits in the research area can be classified into two types based on the main ore-controlling factors： subvolcanic rocks and altered fracture zones. It is believed that the peak period of uranium mineralization in the research area was from the Late Jurasic to the Early Cretaceous，mainly concentrated between l49 and 99Ma ，with the characteristics of a large time span and multiple stages. Uranium mineralization anomalies are mainly distributed along the NE-trending Fw2 trans-shell faults and are mostly found in the NE and NW-trending secondary faults and structural fracture zones. Uranium mineralization is mainly controlled by uranium source，strata and structure，subvolcanic rocks，and hydrothermal alteration. Hematitization，fluoritization，and silicification can be used as direct exploration indicators. The next exploration work should focus on searching for altered fracture zone-type uranium mineralization on both sides of the NE-trending FW2 ore-controlling faults， and secondly， strengthen the exploration of uranium mineralization around volcanic structures and subvolcanic rocks.
Key words： Wulanhada-Chuludaban; mineralization characteristics; prospecting direction； volcanic type uranium ore;subvolcanic type;altered fracture zone type
0 引言
1 区域地质概况
乌兰哈达一楚鲁达板地区处于大兴安岭巨型中生代火山岩带的中段，成矿区带属于扎兰屯火山岩型铀成矿远景带[1]和林西—突泉多金属成矿带[2-3]东三省及内蒙古东部比例尺为 1：50 万遥感地质调查表明，在成矿背景和矿化特征上，大兴安岭地带具有较大的铀矿成矿潜在价值[4]。（剩余22781字）