Abstract
To unravel the geochemical heterogeneity and its origin in different terranes of North China, we conducted geochronological and geochemical analyses of the meta-mafic rocks from the Luliang–Zhongtiao rift zone (Shanxi Province). LA-ICP-MS zircon U–Pb dating yielded mostly End-Neoarchean to Proterozoic ages for the basement rocks (Sushui Complex: 2516 ± 26 Ma; Meta-mafic rocks: 2494 ± 31 Ma), Jiangxian Group (~ 2213 Ma), Zhongtiao Group (2077 ± 29 Ma), Jiehekou Group (1998 ± 23 Ma), and Luliang Group (2152 ± 52 Ma). Petrographic characteristics show that the meta-mafic rocks from the Neoarchean–Paleoproterozoic Zhongtiaoshan (Sushui Complex) have similar geochemical characteristics to the overlying Jiangxian and Zhongtiao Groups. The Paleoproterozoic Luliang and Yejishan Group meta-mafic rocks from Luliangshan also have similar geochemical characteristics but are geochemically different from similar-age rocks from Zhongtiaoshan. This shows that the late-stage rocks have a geochemical inheritance from the early-stage rocks in the same region and that the geochemical heterogeneity of rocks from different areas was originated from the inherited heterogeneity of the magma source.
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