期刊
GEOLOGICAL MAGAZINE
卷 158, 期 8, 页码 1472-1486出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756821000054
关键词
Late Ordovician; earliest Silurian; facies; eustasy; local tectonics; palaeoceanography
资金
- Polish Geological Institute - NRI [62.9012.1912.00.0]
This paper examines the evolution of sedimentary environments in the Late Ordovician to earliest Silurian period in the southern Holy Cross Mountains of SE Poland, revealing the impacts of local tectonism and global eustatic events on the facies layout.
This paper provides insight into the Late Ordovician to earliest Silurian evolution of sedimentary environments in the southern Holy Cross Mountains (SE Poland), which at that time were a part of the SW periphery of Baltica. The facies layout in this area was influenced by the basement block faulting, which differentiated the basin bathymetry into submarine horst and grabens, controlling facies distribution. However, the local tectonism was insufficient to fully mask the global eustatic events. Therefore, it is possible to correlate some facies changes in the Upper Ordovician and lower Llandovery sedimentary record of the southern Holy Cross Mountains with eustatic and palaeoceanographic changes reported worldwide. The most noticeable influence of eustasy on the sedimentary record in the studied area occurs at the Ordovician/Silurian boundary. It is manifested by Hirnantian regressive coarse-grained clastic sediments overlain by a post-glacial anoxic/dysoxic interval represented by the Rhuddanian transgressive black cherts and shales. It is noteworthy that the pre- and post-Hirnantian sedimentary environments in the southern Holy Cross Mountains were affected by upwelling induced by the SE trade winds.
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