爱达荷州中部辉锑矿-爱德华兹堡地区矿床区域地质格架

IF 5.5 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Reed S. Lewis, David E. Stewart, Vincent H. Isakson, Niki E. Wintzer, Eric D. Stewart, Jeffrey D. Vervoort
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引用次数: 0

摘要

爱达荷中部stibite - edwardsburg地区的地质填图和相关的U-Pb年代学工作为该地区金-锑-钨-汞成矿提供了区域地质背景。保存了大约6000米的中元古代Belt-Purcell超群之后的地层;总的来说,这些地层在西南方向形成,在爱达荷岩基中被发现为屋顶垂坠或隔层。该地区早期工作人员怀疑年龄为下古生代的岩石含有500 Ma的碎屑锆石,证实了这一年龄分配。我们确定了白垩纪侵入岩的4个可填期,年龄在95 ~ 85 Ma之间,但认为进一步的定年和详细的填图将更好地显示侵入历史的复杂性。区域变质作用从绿片岩相到角闪岩相不等,白垩系深部岩附近接触变质作用明显。Lu-Hf石榴石年代学表明辉锑矿西北方地层的区域变质作用发生在113 Ma左右,早于岩基侵入。接触变质作用可能发生在15到30万年之后,这取决于具体的岩体年龄。发现了4个始新世大体积的火山灰流矿床(及其假设的喷发中心)。辉锑矿区内的重要构造包括一条西向逆冲断层,目前已被推翻,该断层重复了该剖面的一部分,以及一条N- ne走向的断层,该断层具有局部成矿作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regional Geologic Framework of Mineral Deposits in the Stibnite-Edwardsburg Area, Central Idaho
Abstract Geologic mapping and associated U-Pb geochronologic work in the Stibnite-Edwardsburg area of central Idaho have provided regional geologic context for the gold-antimony-tungsten-mercury mineralization in this area. Roughly 6,000 m of strata that postdate the Mesoproterozoic Belt-Purcell Supergroup are preserved; overall, the strata young to the southwest and are found as roof pendants or septa within the Idaho batholith. Rocks suspected to be lower Paleozoic in age by early workers in the area contain detrital zircons as young as 500 Ma, confirming that age assignment. We recognized four mappable phases of Cretaceous intrusive rocks, ranging in age from about 95 to 85 Ma, but suspect additional dating and detailed mapping would better show the complexity of the intrusive history. Regional metamorphism ranges from greenschist to amphibolite facies and contact metamorphism is conspicuous near Cretaceous plutonic rocks. Lu-Hf garnet geochronology shows that regional metamorphism of the strata northwest of Stibnite occurred at about 113 Ma and thus prior to batholith intrusion. Contact metamorphism likely occurred some 15 to 30 m.y. later, depending on the specific pluton age. Four large-volume Eocene ash-flow deposits (and their hypothesized eruptive centers) were recognized. Important structures in the Stibnite area include a SW-directed thrust fault, now overturned, that repeats part of the section, and N- to NE-striking faults that have localized mineralization.
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来源期刊
Economic Geology
Economic Geology 地学-地球化学与地球物理
CiteScore
10.00
自引率
6.90%
发文量
120
审稿时长
6 months
期刊介绍: The journal, now published semi-quarterly, was first published in 1905 by the Economic Geology Publishing Company (PUBCO), a not-for-profit company established for the purpose of publishing a periodical devoted to economic geology. On the founding of SEG in 1920, a cooperative arrangement between PUBCO and SEG made the journal the official organ of the Society, and PUBCO agreed to carry the Society''s name on the front cover under the heading "Bulletin of the Society of Economic Geologists". PUBCO and SEG continued to operate as cooperating but separate entities until 2001, when the Board of Directors of PUBCO and the Council of SEG, by unanimous consent, approved a formal agreement of merger. The former activities of the PUBCO Board of Directors are now carried out by a Publications Board, a new self-governing unit within SEG.
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