On the formation of magmatic sulphide systems in the lower crust by long‐lived mass transfer through the lithosphere: Insights from the Valmaggia pipe, Ivrea Verbano Zone, Italy

On the formation of magmatic sulphide systems in the lower crust by long‐lived mass transfer through the lithosphere: Insights from the Valmaggia pipe, Ivrea Verbano Zone, Italy
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关于通过岩石圈的长期传质在下地壳中形成岩浆硫化物系统:来自意大利伊夫雷亚韦尔巴诺带瓦尔马贾管道的见解

DOI:
10.1111/ter.12499
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发表时间:
2020
期刊:
影响因子:
2.4
通讯作者:
Nanzad, Bolorchimeg
Nanzad, Bolorchimeg
中科院分区:
地球科学3区
文献类型:
--
作者:
Locmelis, Marek;Moroni, Marilena;Denyszyn, Steven W.;Webb, Laura E.;Fiorentini, Marco L.;Sessa, Gianluca;Caruso, Stefano;Mathur, Ryan;Nanzad, Bolorchimeg

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Ivrea-Verbano带(意大利西北部)的下地壳区域有5个~300 m宽的管状超镁铁质侵入体,这些侵入体被交代并显示出镍铜铂族元素硫化物矿化。为了更好地限制交代作用在矿石成因中的作用,我们研究了Valmaggia保存最完好的管道,该管道位于249 Myrs前。金云母40 Ar/39 Ar分析表明,在~208 Ma和~189 Ma的两次脉冲中,来自于陆下岩石圈地幔(SCLM)的交代流体侵入了该管道,并将硫化物引入管道中。因此,管道反复充当从SCLM到下地壳的质量传递的优选路径,超过6000万年(即,侵位至第二交代脉冲)。隆起的块体边缘,如伊夫雷亚-韦尔巴诺区,是潜在的重要岩浆硫化物勘探目标。我们认为,勘探战略应集中在结构,如管道,可以集中在岩石圈上升过程中的交代剂。
The lower crustal domain of the Ivrea‐Verbano Zone (NW Italy) hosts five ~300‐m‐wide pipe‐like ultramafic intrusions that are metasomatized and exhibit Ni‐Cu‐PGE sulphide mineralization. To better constrain the role of metasomatism in the ore genesis, we studied the best‐preserved pipe at Valmaggia which was emplaced 249 Myrs ago. Phlogopite40Ar/39Ar analyses show that the pipe was infiltrated by metasomatic fluids derived from the subcontinental lithospheric mantle (SCLM) in two pulses at ~208 Ma and ~189 Ma which introduced sulphides into the pipe. Consequently, the pipe repeatedly acted as a preferred path for mass transfer from the SCLM into the lower crust over >60 Myrs (i.e., emplacement to second metasomatic pulse). Uplifted block margins, such as the Ivrea‐Verbano Zone, are potentially important exploration targets for magmatic sulphides. We argue that exploration strategies should focus on structures such as pipes that can focus metasomatic agents during ascent through the lithosphere.
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