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Potential for Porphyry Copper Deposits in Northern Tōhoku (or the Exploration Potential for Base and Precious Metal Deposits in Japan 2020)

机译:北部北部斑岩铜矿潜力(或日本碱基和贵金属矿床的勘探潜力2020)

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Abstract >There are no known porphyry copper deposits in Japan. Attempts were made in the past to explain this paradox as the Japanese islands sit above a subduction zone of the type widely accepted to give rise to porphyry‐type deposits within subvolcanic magmatic–hydrothermal systems. Is it possible that porphyry copper systems are incompatible with the volcanoplutonic setting of the Japanese islands? In other words, is the established model for the genesis of porphyry copper systems not completely correct, or is it that the elusive Japanese porphyry deposit has not yet been found? We argue that, until proven otherwise, the answer lies in the latter option. >In this article, we focus on Akita Prefecture and the surrounding areas and consider the potential for the existence of porphyry copper deposits mainly from an empirical and practical point of view, in contrast with the obviously important petrogenetic and/or tectonic perspectives. We argue that this region is representative of the Tōhoku province of northern Honshu and that it serves as a proxy for Japan in general. Akita is rich in mineralization styles and deposits, including two main magmatic‐hydrothermal deposit types of Neogene age: (i) middle Miocene submarine stratiform volcanogenic massive sulfide (VMS) deposits (Kuroko) and (ii) late Miocene to Pleistocene Ag–Au‐bearing polymetallic epithermal/subepithermal veins. In particular the Au–Ag‐bearing polymetallic veins, which are comparable to intermediate‐sulfidation epithermal deposits commonly associated with porphyry copper systems, were discovered and mined for several centuries before the first Kuroko deposits were found in the late 1800s. Osarizawa, the last active vein mine, closed in 1978. Kuroko deposits, the main source of metal production in Akita in the 20th century, had peak of production in the 1970s, followed by a rapid decline during the 1980s and complete cessation of all mining by 1995. Not surprisingly, the end of mining in Akita, combined with a series of strategic decisions made by the Government and the Japanese metal mining industry, coincided with a cessation of mineral exploration, both in Akita and throughout Japan, with the exception of VMS deposits offshore and limited exploration for bonanza‐grade, low‐sulfidation epithermal gold deposits in Hokkaido. Our analysis of post‐1945 regional exploration in northern Tōhoku indicates that Kuroko deposits were by far the dominant target and that the number of drill holes in the 1990s accounted for less than 4% of the total completed from the early 1960s to 1995. These data indicate that essentially no mineral exploration has been conducted in Tōhoku for Au–Ag‐bearing polymetallic vein deposits during the past 30+ years. We conclude that exploration stopped too early and certainly before it could have benefited from the significant applicable metallogenic and technological breakthroughs of the last few decades. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译:</span><Abstract XMLNS =“http://www.wiley.com/namespaces/wiley”type =“main”xml:lang =“en”> <标题类型=“main”>抽象</ title> >日本没有已知的斑岩铜矿。过去的尝试是为了解释这个悖论,因为日本岛屿位于广泛接受的类型的俯冲区以上,以引起亚氰岩浆 - 水热系统中的斑岩型沉积物。斑岩铜系统是否可能与日本岛的火山助型环境不相容?换句话说,是斑岩铜系统的成因的既定模型,不完全正确,还是尚未发现难以发现的日本斑岩矿床?我们争辩说,直到否则,答案在后一种选择。</ p> 在本文中,我们专注于秋田县及周边地区,并考虑主要从实际和实际的观点来看斑岩铜存款的潜力,相反,与明显重要的化学性和/或构造观点相比。我们认为,该地区代表了北北部Třhoku省,它是一般的日本代理。秋田丰富的矿化风格和矿床,包括两种主要的岩浆 - 热水沉积类型的新生代时代:(i)中间氨基潜艇层层血管生成的大规模硫化物(VMS)沉积物(KUROKO)和(ii)晚期内科(II)晚期对级联 - ag-au-轴承多金属夹层/亚膜静脉。特别地,在180年代后期发现,在第一个Kuroko沉积物发现之前,发现并开采了与卟啉铜系统通常与斑叠铜系统共同相关的中间硫化骨骺沉积物相当的Au-Ag的多金属静脉。 1978年的最后一个活跃的静脉矿,奥萨里扎瓦湖休息.Kuroko矿床,20世纪秋田的金属生产的主要来源,在20世纪70年代拥有高峰,其次在20世纪80年代迅速下滑,并完全停止所有采矿到1995年。罕有奇怪的是,秋田采矿结束,联合政府和日本金属矿业的一系列战略决定,恰逢艾基塔和整个日本的矿物勘探,除了VMS存款海上和北海道赤川血管曲线金矿床有限探索。我们分析了1945年北部北部地区勘探的分析表明,KUROKO存款是迄今为止的主导目标,而20世纪90年代钻孔的数量占20世纪60年代初期至1995年截止日期的4%。这些数据表明,在过去30多年的情况下,在TōHOKU中已经在TōHOKU进行了矿物勘探。我们得出结论,探索太早停止,当然可能会受益于过去几十年的显着适用的金属和技术突破。</ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-26853/'>《Resource Geology》</a> <b style="margin: 0 2px;">|</b><span>2018年第2期</span><b style="margin: 0 2px;">|</b><span>共20页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Arribas Antonio&option=202" target="_blank" rel="nofollow">Arribas Antonio;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Mizuta Toshio&option=202" target="_blank" rel="nofollow">Mizuta Toshio;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Faculty of International Resource SciencesAkita UniversityAkita Japan;</p> <p>Faculty of International Resource SciencesAkita UniversityAkita Japan;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/165.html" title="地质学">地质学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Akita Prefecture&option=203" rel="nofollow">Akita Prefecture;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=copper–gold–silver–zinc&option=203" rel="nofollow">copper–gold–silver–zinc;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=epithermal deposits&option=203" rel="nofollow">epithermal deposits;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=exploration potential&option=203" rel="nofollow">exploration potential;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Japan&option=203" rel="nofollow">Japan;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=porphyry copper systems&option=203" rel="nofollow">porphyry copper systems;</a> </p> <div class="translation"> 机译:秋田县;铜金银 - 锌;膜状沉积物;勘探潜力;日本;斑岩铜系统; 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