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• W4220793806 abstract "&lt;p&gt;The concealed basement of the Mid-Lithuanian domain (MLD) is considered to be part of a larger Precambrian unit within the western East European Craton (EEC), the Mid-Baltic belt (MBB), established by Bogdanova et al. (2015). New data on rock chemistry, U-Pb ages, and the Sm-Nd and Rb-Sr isotopic systems allow to subdivide the MLD into distinct parts, discuss their origin and correlate them with similar units on the Swedish side.&lt;/p&gt;&lt;p&gt;The MLD can be subdivided into two parts: NW and SE. The NW MLD magmatic rocks crystallized from 1.86 to 1.83 Ga and were subsequently intruded by 1.81-1.80 Ga granitoids and charnockitoids. The NW MLD samples have SiO&lt;sub&gt;2&lt;/sub&gt; contents between 48 and 71 wt.% but have similar initial &amp;#949;&lt;sub&gt;Nd&lt;/sub&gt; values at -1 to -2, while their initial Sr isotope ratios scatter. Nd isotope data suggest either an enriched mantle source, or a mantle magma that was mixed with older crustal material.&lt;/p&gt;&lt;p&gt;The SE MLD magmatic rocks originated from a slightly depleted mantle source from 1.87 to 1.82 Ga. At 1792&amp;#177;9 Ma, they were intruded by gabbronorites which in turn were crosscut by thin veinlets of microgabbronorite at 1758&amp;#177;11 Ma. The SE MLD rocks have positive &amp;#949;&lt;sub&gt;Nd&lt;/sub&gt; (+1 to +3) and undisturbed Rb/Sr systems suggesting mantle-derivation, with the variation in composition (mafic to felsic) due to fractionation rather than crustal contributions.&lt;/p&gt;&lt;p&gt;The SE MLD magmatic series with oceanic island arc affinity correlate well with the ca 1.85 Ga Fr&amp;#246;deryd metavolcanics of the Vetlanda-Oskarshamn belt (Salin et al., 2021) in SE Sweden, while the NW MLD rocks are similar to the TIB-0 (1.86-1.85 Ga) Askersund granitoids (cf. Salin et al., 2021) in the southern Bergslagen area. The younger (1.81-1.79 Ga) intrusives in both areas are time-equivalents of the TIB-1 magmatism on the Swedish side. Thus, the MLD as well as its counterparts on the Swedish side of the Baltic Sea, the TIB-0 magmatism in the southern Bergslagen area and the Vetlanda-Oskarshamn belt, may be assigned to the same Mid-Baltic Belt, representing an active, south-facing continental margin established at ca. 1.86 Ga. The shape and outline of the Belt was affected by the Fennoscandia-Sarmatia collision at ca. 1.82-1.80 Ga, the 1.81-1.76 Ga TIB-1 magmatism, as well as by later Mesoproterozoic intraplate magmatism.&lt;/p&gt;&lt;p&gt;Bogdanova, S. et al., 2015. Precambrian Research 259, 5&amp;#8211;33.&lt;/p&gt;&lt;p&gt;Salin, E. et al., 2019. Precambrian Research 328, 287&amp;#8211;308.&lt;/p&gt;&lt;p&gt;Salin, E. et al., 2021. Precambrian Research 356, 106134&lt;/p&gt;" @default.
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• W4220793806 date "2022-03-27" @default.
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• W4220793806 title "Evidence for a ca 1.86 Ga continental margin in the Baltic Sea region: rock chemistry, U-Pb ages, and Nd and Sr isotopic data&#160;" @default.
• W4220793806 doi "https://doi.org/10.5194/egusphere-egu22-2524" @default.
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