Triassic Deposits of Hrvatsko Zagorje

摘要

In the area of Hrvatsko Zagorje, Triassic deposits crop-out in the form of tectonic emplacements, forming the cores of all the major mountains. They also underlie Neogene deposits, as proven in numerous boreholes. During the Triassic period, continuous sedimentation occurred mainly in shallow marine environments, though transient subsidence occurred in the Anisian and Ladinian epochs. In the Lower Triassic, the nearshore clastic and carbonate sediments were deposited, which were succeeded in the Middle and Upper Triassic by shallow-water limestones. The latter for their most part have undergone later dolomitisation. Owing to rapid subsidence during Middle Anisian and Ladinian times, sedimentation of the fine-grained clastics, pelagic limestones and cherts occurred together with local volcanic intrusions.