文章摘要
刘礼广,吴大天,韩双,孙海涛,李和禄,熊志强.辽南瓦房店金刚石矿田110号金伯利岩管的地质特征及成因探讨[J].矿产勘查,2021,12(6):1339-1354
辽南瓦房店金刚石矿田110号金伯利岩管的地质特征及成因探讨
Geological characteristics and genesis of No.110 kimberlite pipe in Wafangdian diamond ore field in southern Liaoning
投稿时间：2020-11-26  
DOI：
中文关键词: 找矿标志  控矿因素  成矿模式  瓦房店矿田  金伯利岩管
英文关键词: prospecting indicators  ore-controlling factors  metallogenic model  Wafangdian ore field  kimberlite pipe
基金项目:本文受辽宁省自然资源地质勘查项目“瓦房店金刚石整装勘查区增储专项”(LNZC2019-0078-20)和中国地质调查局基金项目“塞尔维亚铜金资源调查”(DD20201162)联合资助。
作者单位
刘礼广 辽宁省第六地质大队有限责任公司， 辽宁 大连 116200
许洪斌职工创新工作室， 辽宁 大连 116200 
吴大天 中国地质调查局沈阳地质调查中心，辽宁 沈阳 110032 
韩双 辽宁省第六地质大队有限责任公司， 辽宁 大连 116200
许洪斌职工创新工作室， 辽宁 大连 116200
辽宁地质海上工程勘察院有限责任公司，辽宁 大连 116200 
孙海涛 辽宁省第六地质大队有限责任公司， 辽宁 大连 116200
辽宁地质海上工程勘察院有限责任公司，辽宁 大连 116200 
李和禄 辽宁省第六地质大队有限责任公司， 辽宁 大连 116200
辽宁地质海上工程勘察院有限责任公司，辽宁 大连 116200 
熊志强 辽宁省第六地质大队有限责任公司， 辽宁 大连 116200
辽宁地质海上工程勘察院有限责任公司，辽宁 大连 116200 
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中文摘要:
      本文以辽南瓦房店金刚石矿田110 号金伯利岩管为例，系统分析了该矿床地质特征。瓦房店110 号金伯利岩管位于Ⅰ矿带中段，岩管展布方向与NEE-SWW向张性断裂方向一致，岩管为中间宽大呈岩墙，两侧变窄呈脉状；岩管的形成与NEE-SWW向张性破裂变形构造直接相关。岩管的岩石类型主要为含围岩角砾的斑状金伯利岩，造岩矿物有橄榄石和金云母，指示矿物及副矿物有镁铝榴石、铬铁矿、辉石、角闪石、金云母、钛铁矿等。岩石化学成分表明，SiO2 平均含量22.66%，属于硅酸不饱和碱系列超基性岩。主量元素特征为SiO2、MgO偏低，而CaO、CO2偏高，Na2O+K2O含量为0.14%～1.16%，K2O/Na2O为1.5～7.7， 显示富钾金伯利岩特征。SiO2 与CaO为负相关，与Na2O+K2O为正相关。SiO2-Al2O3图反映出110号岩管的金伯利岩未发生地壳物质混染。岩石中Cr、Ni、Ti、Co等元素含量相对偏低，不相容元素Ba、Sr、Zr、Nb、Ta、U、Th元素含量较高。研究认为，瓦房店金伯利岩型金刚石是在地幔中由地幔流体交代地幔岩石， 含碳物质在950～1200 ℃发生氧化还原反应形成的。来自于上地幔或地幔过渡带的岩浆以“细长的管道”形式向上运移过程中捕获了已经形成的金刚石，到达地壳浅部，冷却形成了金伯利岩。
英文摘要:
      This paper takes the No.110 kimberlite pipe in the Wafangdian diamond field in southern Liaoning as an example to systematically analyze the geological characteristics of the deposit. The Wafangdian No.110 Kimberlite pipe is located in the middle section of ore belt I. Based on field studies, it is shown that the distribution direction of the rock pipe is consistent with the direction of the NEE-SWW tensile fracture. The rock pipe is wide in the middle and narrows on both sides of the rock wall. The formation of rock tube is directly related to the current strain. The rock type of the rock tube is mainly porphyritic kimberlite containing wall rock breccia. The rock-forming minerals include olivine and phlogopite. The indicator minerals and accessory minerals include pyrite, chromite, pyroxene, amphibolite, mica, Ilmenite etc. The chemical composition of the rock shows that the average content of SiO2 is 22.66%, which belongs to the ultrabasic rock of silicic acid unsaturated alkalicontaining series. The main elements are characterized by low SiO2, MgO, high CaO, CO2, Na2O+K2O content ranging from 0.14% to 1.16%, and K2O/Na2O ranging from 1.5 to 7.7, showing the characteristics of potassiumrich kimberlite. SiO2 is negatively correlated with CaO, and positively correlated with Na2O+K2O. The SiO2-Al2O3 map reflects that the kimberlite of No.110 rock tube has not been contaminated by crustal materials. The content of Cr, Ni, Ti, Co and other elements in the rock is relatively low, and the content of incompatible elements Ba, Sr, Zr, Nb, Ta, U, and Th is relatively high. Studies have shown that the Wafangdian Kimberlite-type diamonds are formed by mantle fluids in the mantle replaced by mantle rocks, and carbonaceous materials undergo oxidationreduction reactions at 950 to 1200 ℃. The magma from the upper mantle or transition zone of the mantle captures the formed diamonds during the upward migration in the form of “slender pipes”, reaches the shallow part of the crust, and cools to form kimberlite.
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