The Mesoproterozoic ‘seismite’ at Laiyuan (Hebei Province, E China) re-interpreted
Journal Title: Geologos - Year 2014, Vol 20, Issue 2
Abstract
A 1-million m3 breccia near Laiyuan (Hebei Province, E China) occurs as a block-like lithological unit between dolostones of the 1.55–1.45 Ga (Early Mesoproterozoic) Wumishan Formation. It has previously been interpreted as a seismite, but it appears not to fulfil any of the commonly accepted criteria that jointly are considered diagnostic for seismites. Its presence in a graben-like structure with almost vertical bounding fault planes rather indicates an origin as a (submarine) valley fill. As the valley originated by tectonic activity in the form of faulting, the breccia can be considered as a secondary effect of seismic activity, but it does not represent a seismite.
Authors and Affiliations
A. J. Loon
Keywords
Related Articles
- EP ID EP165176
- DOI 10.2478/logos-2014-0012
- Views 169
- Downloads 0
Modelling geothermal conditions in part of the Szczecin Trough – the Chociwel area
The Chociwel region is part of the Szczecin Trough and constitutes the northeastern segment of the extended Szczecin-Gorzów Synclinorium . Lower Jurassic reservoirs of high permeability of up to 1145 mD can discharge geo...
Substratum morphology and significance during the Weichselian Odra ice lobe advance in northeast Germany and northwest Poland
In the Polish Lowlands, three main ice lobes, referred to as Odra, Vistula and Mazury, formed during the Last Scandinavian Glaciation. These lobes protruded at least several kilometres beyond the main ice margin and it i...
Reconstruction of sediment provenance and transport processes from the surface textures of quartz grains from Late Pleistocene sandurs and an ice-marginal valley in NW Poland
During the Pomeranian phase of the Weichselian glaciation (~17-16 ka), the Toruń-Eberswalde ice-marginal valley (NW Poland and easternmost Germany) drained water from the Pomeranian ice sheet, while intensive aeolian pro...
Peat decomposition - shaping factors, significance in environmental studies and methods of determination; a literature review
A review of literature data on the degree of peat decomposition – an important parameter that yields data on environmental conditions during the peat-forming process, i.e., humidity of the mire surface, is presented. A d...
Geochemistry and statistical analyses of porphyry system and epithermal veins at Hizehjan in northwestern Iran
Situated about 130 km northeast of Tabriz (northwest Iran), the Mazra’eh Shadi deposit is in the Arasbaran metallogenic belt (AAB). Intrusion of subvolcanic rocks, such as quartz monzodiorite-diorite porphyry, into Eocen...