Integrated Re-Os, Ar/Ar, and U-Pb geochronology directly dates the timing of mineralization at the Mina Justa and Marcona deposits, Peru

IF 3.9 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
M. Rodríguez-Mustafa, Adam C. Simon, Robert M. Holder, Holly Stein, A. Kylander‐Clark, B. Jicha, Daniel Blakemore, Edson L. B. Machado
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Abstract

Iron oxide−copper−gold (IOCG) and iron oxide−apatite (IOA) deposits are important sources of Cu and Fe, respectively. They contain abundant Fe-oxides and may contain Au, Ag, Co, rare earth elements (REEs), U, Ni, and V as economically important by-products. In Peru, the Mina Justa IOCG deposit is located next to the giant Marcona IOA deposit. Constraining the timing of Fe and Cu mineralization at Mina Justa is fundamental to understanding the duration and type of processes that generated this mineral deposit, and ultimately to testing the genetic link with other deposits in the area. Previous authors used alteration minerals to indirectly date Cu mineralization at Mina Justa at around 100 Ma. We report Ar/Ar dates of actinolite, U-Pb dates of magnetite, apatite, and titanite collected by in situ laser-ablation−multicollector−inductively coupled plasma−mass spectrometry, and Re-Os thermal ionization mass spectrometry dates for sulfides. These results indicate that Cu mineralization at Mina Justa occurred at ca. 160 Ma and that Fe mineralization is older and coeval with the neighboring Marcona IOA deposit, consistent with Cu mineralization overprinting IOA-style mineralization at Mina Justa.
综合Re-Os、Ar/Ar和U-Pb地质年代学直接测定秘鲁Mina Justa和Marcona矿床的成矿时间
氧化铁-铜-金(IOCG)矿床和氧化铁-磷灰石(IOA)矿床分别是铜和铁的重要来源。它们含有丰富的铁氧化物,并可能含有Au, Ag, Co,稀土元素(ree), U, Ni和V作为重要的经济副产品。在秘鲁,Mina Justa IOCG矿床位于巨大的Marcona IOA矿床旁边。限制Mina Justa的铁和铜矿化的时间对于理解产生该矿床的过程的持续时间和类型至关重要,并最终测试与该地区其他矿床的遗传联系。以前的作者使用蚀变矿物间接测定了Mina Justa铜成矿时间约为100 Ma。我们报告了通过原位激光烧蚀-多收集器-电感耦合等离子体质谱法收集的放线石的Ar/Ar日期,磁铁矿、磷灰石和钛矿的U-Pb日期,以及硫化物的Re-Os热电离体质谱法收集的Re-Os日期。这些结果表明,Mina Justa的Cu成矿时间约为160 Ma,而Fe成矿时间较早,与邻近的Marcona IOA矿床形成时间相同,与Mina Justa的Cu成矿叠加IOA型成矿一致。
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来源期刊
Geological Society of America Bulletin
Geological Society of America Bulletin 地学-地球科学综合
CiteScore
9.30
自引率
8.20%
发文量
159
审稿时长
4-8 weeks
期刊介绍: The GSA Bulletin is the Society''s premier scholarly journal, published continuously since 1890. Its first editor was William John (WJ) McGee, who was responsible for establishing much of its original style and format. Fully refereed, each bimonthly issue includes 16-20 papers focusing on the most definitive, timely, and classic-style research in all earth-science disciplines. The Bulletin welcomes most contributions that are data-rich, mature studies of broad interest (i.e., of interest to more than one sub-discipline of earth science) and of lasting, archival quality. These include (but are not limited to) studies related to tectonics, structural geology, geochemistry, geophysics, hydrogeology, marine geology, paleoclimatology, planetary geology, quaternary geology/geomorphology, sedimentary geology, stratigraphy, and volcanology. The journal is committed to further developing both the scope of its content and its international profile so that it publishes the most current earth science research that will be of wide interest to geoscientists.
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