Selective metasomatism of ultramafic cumulates within Archean supracrustal sequences  

作　　者：Lingyu Zhang Sampriti Basak David Zakharov Kristoffer Szilas 

机构地区：[1]Department of Geosciences and Natural Resource Management,University of Copenhagen,Øster Voldgade 10,1350 Copenhagen,Denmark [2]Geological and Environmental Sciences,Western Michigan University,Kalamazoo,MI 49008,USA

出　　处：《Geoscience Frontiers》2024年第5期283-299,共17页地学前缘（英文版）

基　　金：funding from VILLUM FONDEN Grant VKR18978 to Kristoffer Szilas;China Scholarship Council(No.202006170037)to Lingyu Zhang.

摘　　要：The Neoarchean StorøSupracrustal Belt in SW Greenland comprises a sequence of mature quartzite,metapelite,amphibolite,and ultramafic rocks that underwent amphibolite facies metamorphism during the amalgamation of the Mesoarchean Akia Terrane and the Eoarchean Færingehavn Terrane.In this belt,tourmaline is found in a transition zone between ultramafic and metapelitic rocks,but also occurs as orbicules within the ultramafic rocks.These tourmaline orbicules hosted by ultramafic rocks are reported for the first time in the North Atlantic craton,thus indicating a unique formation mechanism.We conducted a comprehensive examination of the petrology,whole-rock and mineral chemistry,and oxygen isotope compositions from borehole samples in the StorøSupracrustal Belt,to elucidate the metasomatic events associated with the formation of the orbicular tourmalines.The Storøultramafic rocks have high MgO,Cr,and Ni contents,with low abundances of REE and HFSE,and preserve a typical cumulate texture.These features are similar to those of ultramafic cumulates found in other Archean supracrustal belts,suggesting a cumulate origin for the Storøultramafic rocks.Furthermore,the morphology and composition of the tourmaline orbicules within these cumulates indicate that they originated from melts with high boron and high water concentrations that infiltrated the ultramafic rocks.The main factor influencing the morphology of the tourmaline orbicules is the silicification of the ultramafic rocks,driven by their lower chemical potential of SiO_(2)compared to the surrounding rocks.This silicification process,in combination with compositional variations of cumulates during fractional crystallization,has contributed to the geochemical diversity observed in Archean ultramafic rocks.Thus,it is crucial to understand the effects of such selective metasomatism on Archean ultramafic rocks,as this will facilitate the extraction of original information preserved in the early rock record.

关 键 词：ARCHEAN Ultramafic rocks TOURMALINE METASOMATISM Storø GREENLAND 

分 类 号：P588.3[天文地球—岩石学] P59[天文地球—地质学]