土耳其西北部 Biga 半岛 Kirazlı 热液型金银矿床和斑岩型铜矿床的漫长成矿过程和岩浆演化:锆石 U-Pb、白云母 40Ar/39Ar 和辉钼矿 Re-Os 地质年代学证据

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2023-12-18 DOI:10.1007/s00126-023-01235-2
Ali Aluç, İlkay Kuşcu, Alexey Ulyanov, David Selby, Clémentine Antoine, Richard Spikings, Robert Moritz
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引用次数: 0

摘要

基拉兹勒矿床位于比加半岛成矿带的中心,其地质环境的特点是延伸构造环境。基拉兹勒主矿区下方有一个呈西北-东南走向的高硫化(HS)矿体,总储量达3386万吨,金品位为0.69克/吨,银品位为9.42克/吨。在其附近的钻探中发现了一个斑岩型铜矿体,由始新世侵入岩和火山岩构成。HS 热液矿床由部分硅化和砾岩化的渐新世火山和火山碎屑岩层序赋存,主要由玄武安山岩熔岩流和碎石/水晶凝灰岩组成。岩石地球化学和锆石 U-Pb 放射性年龄使我们能够区分出三个不同的高 K 钙碱性岩浆事件,时间分别在约 41、38 和 32 Ma。这三个事件分别发生在大约 41、38 和 32 Ma 年,其来源是在上升过程中与地壳相互作用的变质地幔熔体。斑岩铜矿化发生在 36.7 ± 0.4 Ma(白云母 40Ar/39Ar 年龄),随后重新开放并沉积了贱金属。横切石英-黄铁矿-辉钼矿脉形成于 33.6 ± 0.2 Ma(辉钼矿 Re-Os 年龄),随后在约 31 Ma 处形成了 HS 热液型金-银矿。根据之前的研究,该事件发生在 31 Ma。我们的辐射测量数据表明,Kirazlı矿床在大约10万年的时间里经历了新生代岩浆和金属成矿的长期演化。我们的研究表明,在比加半岛旷日持久的伸展构造过程中,连续、独立、叠加但在基因上互不相关的HS表生贵金属、热液钼、贱金属和斑岩铜系统一直活跃在同一地点。
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Protracted metallogenic and magmatic evolution of the Kirazlı epithermal Au-Ag and porphyry Cu deposits, Biga Peninsula, NW Turkey: evidence from zircon U-Pb, muscovite 40Ar/39Ar, and molybdenite Re-Os geochronology

The Kirazlı deposit is located at the center of the Biga Peninsula metallogenic province, in a geological setting characterized by an extensional tectonic environment. A NNW-SSE trending high-sulfidation (HS) orebody with a total reserve of 33.86 Mt @ 0.69 g/t Au and 9.42 g/t Ag lies beneath the Kirazlı Main zone. A porphyry Cu orebody hosted by Eocene intrusive and volcanic rocks has been intersected by drilling within its vicinity. The HS epithermal deposit is hosted by a partly silicified and brecciated Oligocene volcanic and volcaniclastic sequence consisting mainly of basaltic andesite lava flow and lithic/crystal tuff. Lithogeochemistry and zircon U-Pb radiometric ages allow us to distinguish three distinct high-K calc-alkaline magmatic events at ca. 41, 38, and 32 Ma, sourced by metasomatized mantle melts, which have interacted with the crust during their ascent. Porphyry Cu mineralization took place at 36.7 ± 0.4 Ma (muscovite 40Ar/39Ar age) with subsequent re-opening and base metal deposition. Crosscutting quartz-pyrite-molybdenite veins were emplaced at 33.6 ± 0.2 Ma (molybdenite Re-Os age), and followed by the HS epithermal Au-Ag event at ca. 31 Ma, based on a previous study. Our radiometric data indicate that the Kirazlı deposit has recorded a long-lasting Cenozoic magmatic and metallogenic evolution during about 10 Myr. Our study demonstrates that successive, independent, and overprinting, but genetically unrelated, HS epithermal precious metal, hydrothermal Mo, base metal, and porphyry Cu systems have been active at the same location during protracted extensional tectonics of the Biga Peninsula.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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