A new detailed map of Bouguer gravity anomalies covers an area of c. 13 500 km2 of the Lugian Unit in the Bohemian Massif (Czech Republic, Germany and Poland). It is limited approximately by the towns of Bautzen (NW), Zlotoryja (NE), Cerveny Kostelec (SE) and Roudnice nad Labem (SW). An extensive gravity low about 120 km long (W-E) and 40 km wide (N-S) is the most remarkable feature in the Bouguer gravity map and the maps derived from it. This central Lugian gravity low (CLGL), is adjacent to the Saxothuringian low in the West but it disappears in the gravity high of the Kaczawa Complex and the Intra Sudetic Basin in the East. Five partial gravity lows, i.e., (A) - Ceska Kamenice Low, (B) - Zittau Low, (C) - Jizerske hory Mts. Low, (D) - North Krkonose/Karkonosze Mts. Low and (E) - Straz pod Ralskem Low are identified within the CLGL. The lows (C), (D) and (E) were interpreted quantitatively using a gravity modelling, whereas the lows (A) and (B) were evaluated without modelling. The presented gravity cross-sections show that the Cambrian Rumburk granite is the main source of the lows (A), (B) and (E). On the other hand, the Variscan Krkonose-Jizera granites together with the Cambrian Jizera orthogneisses are the main sources of the lows (C) and (D). Besides that, the sediments of the Czech Cretaceous Basin play an important additional role in the formation of lows (A) and (E) and the Zittau Basin Tertiary sediments are markedly involved in the low (B) amplitude. The gravity cross-sections imply that the granite bodies influencing gravity lows can reach a depth of 7 to 10 km. A hidden mafic body situated in the basement of the South Krkonose Piedmont Late Palaeozoic Basin, producing the gravity high near the town of Vrchlabi, was interpreted to reach a depth of 5 to 6 km beneath the current surface
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